/* Copyright (C) 2000-2006 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Some general useful functions */ #include "mysql_priv.h" #include "sql_trigger.h" #include #include "md5.h" /* Functions defined in this file */ void open_table_error(TABLE_SHARE *share, int error, int db_errno, myf errortype, int errarg); static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head, File file); static void fix_type_pointers(const char ***array, TYPELIB *point_to_type, uint types, char **names); static uint find_field(Field **fields, byte *record, uint start, uint length); /* Get column name from column hash */ static byte *get_field_name(Field **buff, uint *length, my_bool not_used __attribute__((unused))) { *length= (uint) strlen((*buff)->field_name); return (byte*) (*buff)->field_name; } /* Returns pointer to '.frm' extension of the file name. SYNOPSIS fn_rext() name file name DESCRIPTION Checks file name part starting with the rightmost '.' character, and returns it if it is equal to '.frm'. TODO It is a good idea to get rid of this function modifying the code to garantee that the functions presently calling fn_rext() always get arguments in the same format: either with '.frm' or without '.frm'. RETURN VALUES Pointer to the '.frm' extension. If there is no extension, or extension is not '.frm', pointer at the end of file name. */ char *fn_rext(char *name) { char *res= strrchr(name, '.'); if (res && !strcmp(res, reg_ext)) return res; return name + strlen(name); } /* Allocate a setup TABLE_SHARE structure SYNOPSIS alloc_table_share() TABLE_LIST Take database and table name from there key Table cache key (db \0 table_name \0...) key_length Length of key RETURN 0 Error (out of memory) # Share */ TABLE_SHARE *alloc_table_share(TABLE_LIST *table_list, char *key, uint key_length) { MEM_ROOT mem_root; TABLE_SHARE *share; char *key_buff, *path_buff; char path[FN_REFLEN]; uint path_length; DBUG_ENTER("alloc_table_share"); DBUG_PRINT("enter", ("table: '%s'.'%s'", table_list->db, table_list->table_name)); path_length= build_table_filename(path, sizeof(path) - 1, table_list->db, table_list->table_name, "", 0); init_sql_alloc(&mem_root, TABLE_ALLOC_BLOCK_SIZE, 0); if (multi_alloc_root(&mem_root, &share, sizeof(*share), &key_buff, key_length, &path_buff, path_length + 1, NULL)) { bzero((char*) share, sizeof(*share)); share->set_table_cache_key(key_buff, key, key_length); share->path.str= path_buff; share->path.length= path_length; strmov(share->path.str, path); share->normalized_path.str= share->path.str; share->normalized_path.length= path_length; share->version= refresh_version; share->flush_version= flush_version; /* This constant is used to mark that no table map version has been assigned. No arithmetic is done on the value: it will be overwritten with a value taken from MYSQL_BIN_LOG. */ share->table_map_version= ~(ulonglong)0; /* Since alloc_table_share() can be called without any locking (for example, ha_create_table... functions), we do not assign a table map id here. Instead we assign a value that is not used elsewhere, and then assign a table map id inside open_table() under the protection of the LOCK_open mutex. */ share->table_map_id= ~0UL; share->cached_row_logging_check= -1; memcpy((char*) &share->mem_root, (char*) &mem_root, sizeof(mem_root)); pthread_mutex_init(&share->mutex, MY_MUTEX_INIT_FAST); pthread_cond_init(&share->cond, NULL); } DBUG_RETURN(share); } /* Initialize share for temporary tables SYNOPSIS init_tmp_table_share() share Share to fill key Table_cache_key, as generated from create_table_def_key. must start with db name. key_length Length of key table_name Table name path Path to file (possible in lower case) without .frm NOTES This is different from alloc_table_share() because temporary tables don't have to be shared between threads or put into the table def cache, so we can do some things notable simpler and faster If table is not put in thd->temporary_tables (happens only when one uses OPEN TEMPORARY) then one can specify 'db' as key and use key_length= 0 as neither table_cache_key or key_length will be used). */ void init_tmp_table_share(TABLE_SHARE *share, const char *key, uint key_length, const char *table_name, const char *path) { DBUG_ENTER("init_tmp_table_share"); DBUG_PRINT("enter", ("table: '%s'.'%s'", key, table_name)); bzero((char*) share, sizeof(*share)); init_sql_alloc(&share->mem_root, TABLE_ALLOC_BLOCK_SIZE, 0); share->tmp_table= INTERNAL_TMP_TABLE; share->db.str= (char*) key; share->db.length= strlen(key); share->table_cache_key.str= (char*) key; share->table_cache_key.length= key_length; share->table_name.str= (char*) table_name; share->table_name.length= strlen(table_name); share->path.str= (char*) path; share->normalized_path.str= (char*) path; share->path.length= share->normalized_path.length= strlen(path); share->frm_version= FRM_VER_TRUE_VARCHAR; /* Temporary tables are not replicated, but we set up these fields anyway to be able to catch errors. */ share->table_map_version= ~(ulonglong)0; share->table_map_id= ~0UL; share->cached_row_logging_check= -1; DBUG_VOID_RETURN; } /* Free table share and memory used by it SYNOPSIS free_table_share() share Table share NOTES share->mutex must be locked when we come here if it's not a temp table */ void free_table_share(TABLE_SHARE *share) { MEM_ROOT mem_root; DBUG_ENTER("free_table_share"); DBUG_PRINT("enter", ("table: %s.%s", share->db.str, share->table_name.str)); DBUG_ASSERT(share->ref_count == 0); /* If someone is waiting for this to be deleted, inform it about this. Don't do a delete until we know that no one is refering to this anymore. */ if (share->tmp_table == NO_TMP_TABLE) { /* share->mutex is locked in release_table_share() */ while (share->waiting_on_cond) { pthread_cond_broadcast(&share->cond); pthread_cond_wait(&share->cond, &share->mutex); } /* No thread refers to this anymore */ pthread_mutex_unlock(&share->mutex); pthread_mutex_destroy(&share->mutex); pthread_cond_destroy(&share->cond); } hash_free(&share->name_hash); /* We must copy mem_root from share because share is allocated through it */ memcpy((char*) &mem_root, (char*) &share->mem_root, sizeof(mem_root)); free_root(&mem_root, MYF(0)); // Free's share DBUG_VOID_RETURN; } /* Read table definition from a binary / text based .frm file SYNOPSIS open_table_def() thd Thread handler share Fill this with table definition db_flags Bit mask of the following flags: OPEN_VIEW NOTES This function is called when the table definition is not cached in table_def_cache The data is returned in 'share', which is alloced by alloc_table_share().. The code assumes that share is initialized. RETURN VALUES 0 ok 1 Error (see open_table_error) 2 Error (see open_table_error) 3 Wrong data in .frm file 4 Error (see open_table_error) 5 Error (see open_table_error: charset unavailable) 6 Unknown .frm version */ int open_table_def(THD *thd, TABLE_SHARE *share, uint db_flags) { int error, table_type; bool error_given; File file; uchar head[288], *disk_buff; char path[FN_REFLEN]; MEM_ROOT **root_ptr, *old_root; DBUG_ENTER("open_table_def"); DBUG_PRINT("enter", ("table: '%s'.'%s' path: '%s'", share->db.str, share->table_name.str, share->normalized_path.str)); error= 1; error_given= 0; disk_buff= NULL; strxmov(path, share->normalized_path.str, reg_ext, NullS); if ((file= my_open(path, O_RDONLY | O_SHARE, MYF(0))) < 0) { if (strchr(share->table_name.str, '@')) goto err_not_open; /* Try unecoded 5.0 name */ uint length; strxnmov(path, sizeof(path)-1, mysql_data_home, "/", share->db.str, "/", share->table_name.str, reg_ext, NullS); length= unpack_filename(path, path) - reg_ext_length; /* The following is a safety test and should never fail as the old file name should never be longer than the new one. */ DBUG_ASSERT(length <= share->normalized_path.length); /* If the old and the new names have the same length, then table name does not have tricky characters, so no need to check the old file name. */ if (length == share->normalized_path.length || ((file= my_open(path, O_RDONLY | O_SHARE, MYF(0))) < 0)) goto err_not_open; /* Unencoded 5.0 table name found */ path[length]= '\0'; // Remove .frm extension strmov(share->normalized_path.str, path); share->normalized_path.length= length; } error= 4; if (my_read(file,(byte*) head, 64, MYF(MY_NABP))) goto err; if (head[0] == (uchar) 254 && head[1] == 1) { if (head[2] == FRM_VER || head[2] == FRM_VER+1 || (head[2] >= FRM_VER+3 && head[2] <= FRM_VER+4)) table_type= 1; else { error= 6; // Unkown .frm version goto err; } } else if (memcmp(head, STRING_WITH_LEN("TYPE=")) == 0) { error= 5; if (memcmp(head+5,"VIEW",4) == 0) { share->is_view= 1; if (db_flags & OPEN_VIEW) error= 0; } goto err; } else goto err; /* No handling of text based files yet */ if (table_type == 1) { root_ptr= my_pthread_getspecific_ptr(MEM_ROOT**, THR_MALLOC); old_root= *root_ptr; *root_ptr= &share->mem_root; error= open_binary_frm(thd, share, head, file); *root_ptr= old_root; if (share->db.length == 5 && !(lower_case_table_names ? my_strcasecmp(system_charset_info, share->db.str, "mysql") : strcmp(share->db.str, "mysql"))) { /* We can't mark all tables in 'mysql' database as system since we don't allow to lock such tables for writing with any other tables (even with other system tables) and some privilege tables need this. */ if (!(lower_case_table_names ? my_strcasecmp(system_charset_info, share->table_name.str, "proc") : strcmp(share->table_name.str, "proc"))) share->system_table= 1; else { share->log_table= check_if_log_table(share->db.length, share->db.str, share->table_name.length, share->table_name.str, 0); } } error_given= 1; } if (!error) thd->status_var.opened_shares++; err: my_close(file, MYF(MY_WME)); err_not_open: if (error && !error_given) { share->error= error; open_table_error(share, error, (share->open_errno= my_errno), 0); } DBUG_RETURN(error); } /* Read data from a binary .frm file from MySQL 3.23 - 5.0 into TABLE_SHARE */ static int open_binary_frm(THD *thd, TABLE_SHARE *share, uchar *head, File file) { int error, errarg= 0; uint new_frm_ver, field_pack_length, new_field_pack_flag; uint interval_count, interval_parts, read_length, int_length; uint db_create_options, keys, key_parts, n_length; uint key_info_length, com_length, null_bit_pos; uint extra_rec_buf_length; uint i,j; bool use_hash; char *keynames, *record, *names, *comment_pos; uchar *disk_buff, *strpos, *null_flags, *null_pos; ulong pos, record_offset, *rec_per_key, rec_buff_length; handler *handler_file= 0; KEY *keyinfo; KEY_PART_INFO *key_part; SQL_CRYPT *crypted=0; Field **field_ptr, *reg_field; const char **interval_array; enum legacy_db_type legacy_db_type; my_bitmap_map *bitmaps; DBUG_ENTER("open_binary_frm"); new_field_pack_flag= head[27]; new_frm_ver= (head[2] - FRM_VER); field_pack_length= new_frm_ver < 2 ? 11 : 17; disk_buff= 0; error= 3; if (!(pos=get_form_pos(file,head,(TYPELIB*) 0))) goto err; /* purecov: inspected */ share->frm_version= head[2]; /* Check if .frm file created by MySQL 5.0. In this case we want to display CHAR fields as CHAR and not as VARCHAR. We do it this way as we want to keep the old frm version to enable MySQL 4.1 to read these files. */ if (share->frm_version == FRM_VER_TRUE_VARCHAR -1 && head[33] == 5) share->frm_version= FRM_VER_TRUE_VARCHAR; #ifdef WITH_PARTITION_STORAGE_ENGINE if (*(head+61) && !(share->default_part_db_type= ha_checktype(thd, (enum legacy_db_type) (uint) *(head+61), 1, 0))) goto err; DBUG_PRINT("info", ("default_part_db_type = %u", head[61])); #endif legacy_db_type= (enum legacy_db_type) (uint) *(head+3); share->db_type= ha_checktype(thd, legacy_db_type, 0, 0); share->db_create_options= db_create_options= uint2korr(head+30); share->db_options_in_use= share->db_create_options; share->mysql_version= uint4korr(head+51); share->null_field_first= 0; if (!head[32]) // New frm file in 3.23 { share->avg_row_length= uint4korr(head+34); share->transactional= (ha_choice) head[39]; share->row_type= (row_type) head[40]; share->table_charset= get_charset((uint) head[38],MYF(0)); share->null_field_first= 1; } if (!share->table_charset) { /* unknown charset in head[38] or pre-3.23 frm */ if (use_mb(default_charset_info)) { /* Warn that we may be changing the size of character columns */ sql_print_warning("'%s' had no or invalid character set, " "and default character set is multi-byte, " "so character column sizes may have changed", share->path.str); } share->table_charset= default_charset_info; } share->db_record_offset= 1; if (db_create_options & HA_OPTION_LONG_BLOB_PTR) share->blob_ptr_size= portable_sizeof_char_ptr; /* Set temporarily a good value for db_low_byte_first */ share->db_low_byte_first= test(legacy_db_type != DB_TYPE_ISAM); error=4; share->max_rows= uint4korr(head+18); share->min_rows= uint4korr(head+22); /* Read keyinformation */ key_info_length= (uint) uint2korr(head+28); VOID(my_seek(file,(ulong) uint2korr(head+6),MY_SEEK_SET,MYF(0))); if (read_string(file,(gptr*) &disk_buff,key_info_length)) goto err; /* purecov: inspected */ if (disk_buff[0] & 0x80) { share->keys= keys= (disk_buff[1] << 7) | (disk_buff[0] & 0x7f); share->key_parts= key_parts= uint2korr(disk_buff+2); } else { share->keys= keys= disk_buff[0]; share->key_parts= key_parts= disk_buff[1]; } share->keys_for_keyread.init(0); share->keys_in_use.init(keys); n_length=keys*sizeof(KEY)+key_parts*sizeof(KEY_PART_INFO); if (!(keyinfo = (KEY*) alloc_root(&share->mem_root, n_length + uint2korr(disk_buff+4)))) goto err; /* purecov: inspected */ bzero((char*) keyinfo,n_length); share->key_info= keyinfo; key_part= my_reinterpret_cast(KEY_PART_INFO*) (keyinfo+keys); strpos=disk_buff+6; if (!(rec_per_key= (ulong*) alloc_root(&share->mem_root, sizeof(ulong*)*key_parts))) goto err; for (i=0 ; i < keys ; i++, keyinfo++) { keyinfo->table= 0; // Updated in open_frm if (new_frm_ver >= 3) { keyinfo->flags= (uint) uint2korr(strpos) ^ HA_NOSAME; keyinfo->key_length= (uint) uint2korr(strpos+2); keyinfo->key_parts= (uint) strpos[4]; keyinfo->algorithm= (enum ha_key_alg) strpos[5]; keyinfo->block_size= uint2korr(strpos+6); strpos+=8; } else { keyinfo->flags= ((uint) strpos[0]) ^ HA_NOSAME; keyinfo->key_length= (uint) uint2korr(strpos+1); keyinfo->key_parts= (uint) strpos[3]; keyinfo->algorithm= HA_KEY_ALG_UNDEF; strpos+=4; } keyinfo->key_part= key_part; keyinfo->rec_per_key= rec_per_key; for (j=keyinfo->key_parts ; j-- ; key_part++) { *rec_per_key++=0; key_part->fieldnr= (uint16) (uint2korr(strpos) & FIELD_NR_MASK); key_part->offset= (uint) uint2korr(strpos+2)-1; key_part->key_type= (uint) uint2korr(strpos+5); // key_part->field= (Field*) 0; // Will be fixed later if (new_frm_ver >= 1) { key_part->key_part_flag= *(strpos+4); key_part->length= (uint) uint2korr(strpos+7); strpos+=9; } else { key_part->length= *(strpos+4); key_part->key_part_flag=0; if (key_part->length > 128) { key_part->length&=127; /* purecov: inspected */ key_part->key_part_flag=HA_REVERSE_SORT; /* purecov: inspected */ } strpos+=7; } key_part->store_length=key_part->length; } } keynames=(char*) key_part; strpos+= (strmov(keynames, (char *) strpos) - keynames)+1; share->reclength = uint2korr((head+16)); if (*(head+26) == 1) share->system= 1; /* one-record-database */ #ifdef HAVE_CRYPTED_FRM else if (*(head+26) == 2) { crypted= get_crypt_for_frm(); share->crypted= 1; } #endif record_offset= (ulong) (uint2korr(head+6)+ ((uint2korr(head+14) == 0xffff ? uint4korr(head+47) : uint2korr(head+14)))); if ((n_length= uint4korr(head+55))) { /* Read extra data segment */ char *buff, *next_chunk, *buff_end; DBUG_PRINT("info", ("extra segment size is %u bytes", n_length)); if (!(next_chunk= buff= my_malloc(n_length, MYF(MY_WME)))) goto err; if (my_pread(file, (byte*)buff, n_length, record_offset + share->reclength, MYF(MY_NABP))) { my_free(buff, MYF(0)); goto err; } share->connect_string.length= uint2korr(buff); if (! (share->connect_string.str= strmake_root(&share->mem_root, next_chunk + 2, share->connect_string.length))) { my_free(buff, MYF(0)); goto err; } next_chunk+= share->connect_string.length + 2; buff_end= buff + n_length; if (next_chunk + 2 < buff_end) { uint str_db_type_length= uint2korr(next_chunk); LEX_STRING name= { next_chunk + 2, str_db_type_length }; handlerton *tmp_db_type= ha_resolve_by_name(thd, &name); if (tmp_db_type != NULL) { share->db_type= tmp_db_type; DBUG_PRINT("info", ("setting dbtype to '%.*s' (%d)", str_db_type_length, next_chunk + 2, ha_legacy_type(share->db_type))); } #ifdef WITH_PARTITION_STORAGE_ENGINE else { if (!strncmp(next_chunk + 2, "partition", str_db_type_length)) { /* Use partition handler */ share->db_type= partition_hton; DBUG_PRINT("info", ("setting dbtype to '%.*s' (%d)", str_db_type_length, next_chunk + 2, ha_legacy_type(share->db_type))); } } #endif next_chunk+= str_db_type_length + 2; } if (next_chunk + 5 < buff_end) { uint32 partition_info_len = uint4korr(next_chunk); #ifdef WITH_PARTITION_STORAGE_ENGINE if ((share->partition_info_len= partition_info_len)) { if (!(share->partition_info= (uchar*) memdup_root(&share->mem_root, next_chunk + 4, partition_info_len + 1))) { my_free(buff, MYF(0)); goto err; } } #else if (partition_info_len) { DBUG_PRINT("info", ("WITH_PARTITION_STORAGE_ENGINE is not defined")); my_free(buff, MYF(0)); goto err; } #endif next_chunk+= 5 + partition_info_len; } #if MYSQL_VERSION_ID < 50200 if (share->mysql_version >= 50106 && share->mysql_version <= 50109) { /* Partition state array was here in version 5.1.6 to 5.1.9, this code makes it possible to load a 5.1.6 table in later versions. Can most likely be removed at some point in time. Will only be used for upgrades within 5.1 series of versions. Upgrade to 5.2 can only be done from newer 5.1 versions. */ next_chunk+= 4; } else if (share->mysql_version >= 50110) #endif { /* New auto_partitioned indicator introduced in 5.1.11 */ #ifdef WITH_PARTITION_STORAGE_ENGINE share->auto_partitioned= *next_chunk; #endif next_chunk++; } keyinfo= share->key_info; for (i= 0; i < keys; i++, keyinfo++) { if (keyinfo->flags & HA_USES_PARSER) { LEX_STRING parser_name; if (next_chunk >= buff_end) { DBUG_PRINT("error", ("fulltext key uses parser that is not defined in .frm")); my_free(buff, MYF(0)); goto err; } parser_name.str= next_chunk; parser_name.length= strlen(next_chunk); keyinfo->parser= plugin_lock(&parser_name, MYSQL_FTPARSER_PLUGIN); if (! keyinfo->parser) { my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), parser_name.str); my_free(buff, MYF(0)); goto err; } } } my_free(buff, MYF(0)); } share->key_block_size= uint2korr(head+62); error=4; extra_rec_buf_length= uint2korr(head+59); rec_buff_length= ALIGN_SIZE(share->reclength + 1 + extra_rec_buf_length); share->rec_buff_length= rec_buff_length; if (!(record= (char *) alloc_root(&share->mem_root, rec_buff_length))) goto err; /* purecov: inspected */ share->default_values= (byte *) record; if (my_pread(file,(byte*) record, (uint) share->reclength, record_offset, MYF(MY_NABP))) goto err; /* purecov: inspected */ VOID(my_seek(file,pos,MY_SEEK_SET,MYF(0))); if (my_read(file,(byte*) head,288,MYF(MY_NABP))) goto err; #ifdef HAVE_CRYPTED_FRM if (crypted) { crypted->decode((char*) head+256,288-256); if (sint2korr(head+284) != 0) // Should be 0 goto err; // Wrong password } #endif share->fields= uint2korr(head+258); pos= uint2korr(head+260); /* Length of all screens */ n_length= uint2korr(head+268); interval_count= uint2korr(head+270); interval_parts= uint2korr(head+272); int_length= uint2korr(head+274); share->null_fields= uint2korr(head+282); com_length= uint2korr(head+284); share->comment.length= (int) (head[46]); share->comment.str= strmake_root(&share->mem_root, (char*) head+47, share->comment.length); DBUG_PRINT("info",("i_count: %d i_parts: %d index: %d n_length: %d int_length: %d com_length: %d", interval_count,interval_parts, share->keys,n_length,int_length, com_length)); if (!(field_ptr = (Field **) alloc_root(&share->mem_root, (uint) ((share->fields+1)*sizeof(Field*)+ interval_count*sizeof(TYPELIB)+ (share->fields+interval_parts+ keys+3)*sizeof(my_string)+ (n_length+int_length+com_length))))) goto err; /* purecov: inspected */ share->field= field_ptr; read_length=(uint) (share->fields * field_pack_length + pos+ (uint) (n_length+int_length+com_length)); if (read_string(file,(gptr*) &disk_buff,read_length)) goto err; /* purecov: inspected */ #ifdef HAVE_CRYPTED_FRM if (crypted) { crypted->decode((char*) disk_buff,read_length); delete crypted; crypted=0; } #endif strpos= disk_buff+pos; share->intervals= (TYPELIB*) (field_ptr+share->fields+1); interval_array= (const char **) (share->intervals+interval_count); names= (char*) (interval_array+share->fields+interval_parts+keys+3); if (!interval_count) share->intervals= 0; // For better debugging memcpy((char*) names, strpos+(share->fields*field_pack_length), (uint) (n_length+int_length)); comment_pos= names+(n_length+int_length); memcpy(comment_pos, disk_buff+read_length-com_length, com_length); fix_type_pointers(&interval_array, &share->fieldnames, 1, &names); if (share->fieldnames.count != share->fields) goto err; fix_type_pointers(&interval_array, share->intervals, interval_count, &names); { /* Set ENUM and SET lengths */ TYPELIB *interval; for (interval= share->intervals; interval < share->intervals + interval_count; interval++) { uint count= (uint) (interval->count + 1) * sizeof(uint); if (!(interval->type_lengths= (uint *) alloc_root(&share->mem_root, count))) goto err; for (count= 0; count < interval->count; count++) { char *val= (char*) interval->type_names[count]; interval->type_lengths[count]= strlen(val); } interval->type_lengths[count]= 0; } } if (keynames) fix_type_pointers(&interval_array, &share->keynames, 1, &keynames); /* Allocate handler */ if (!(handler_file= get_new_handler(share, thd->mem_root, share->db_type))) goto err; record= (char*) share->default_values-1; /* Fieldstart = 1 */ if (share->null_field_first) { null_flags= null_pos= (uchar*) record+1; null_bit_pos= (db_create_options & HA_OPTION_PACK_RECORD) ? 0 : 1; /* null_bytes below is only correct under the condition that there are no bit fields. Correct values is set below after the table struct is initialized */ share->null_bytes= (share->null_fields + null_bit_pos + 7) / 8; } #ifndef WE_WANT_TO_SUPPORT_VERY_OLD_FRM_FILES else { share->null_bytes= (share->null_fields+7)/8; null_flags= null_pos= (uchar*) (record + 1 +share->reclength - share->null_bytes); null_bit_pos= 0; } #endif use_hash= share->fields >= MAX_FIELDS_BEFORE_HASH; if (use_hash) use_hash= !hash_init(&share->name_hash, system_charset_info, share->fields,0,0, (hash_get_key) get_field_name,0,0); for (i=0 ; i < share->fields; i++, strpos+=field_pack_length, field_ptr++) { uint pack_flag, interval_nr, unireg_type, recpos, field_length; enum_field_types field_type; CHARSET_INFO *charset=NULL; Field::geometry_type geom_type= Field::GEOM_GEOMETRY; LEX_STRING comment; if (new_frm_ver >= 3) { /* new frm file in 4.1 */ field_length= uint2korr(strpos+3); recpos= uint3korr(strpos+5); pack_flag= uint2korr(strpos+8); unireg_type= (uint) strpos[10]; interval_nr= (uint) strpos[12]; uint comment_length=uint2korr(strpos+15); field_type=(enum_field_types) (uint) strpos[13]; /* charset and geometry_type share the same byte in frm */ if (field_type == MYSQL_TYPE_GEOMETRY) { #ifdef HAVE_SPATIAL geom_type= (Field::geometry_type) strpos[14]; charset= &my_charset_bin; #else error= 4; // unsupported field type goto err; #endif } else { if (!strpos[14]) charset= &my_charset_bin; else if (!(charset=get_charset((uint) strpos[14], MYF(0)))) { error= 5; // Unknown or unavailable charset errarg= (int) strpos[14]; goto err; } } if (!comment_length) { comment.str= (char*) ""; comment.length=0; } else { comment.str= (char*) comment_pos; comment.length= comment_length; comment_pos+= comment_length; } } else { field_length= (uint) strpos[3]; recpos= uint2korr(strpos+4), pack_flag= uint2korr(strpos+6); pack_flag&= ~FIELDFLAG_NO_DEFAULT; // Safety for old files unireg_type= (uint) strpos[8]; interval_nr= (uint) strpos[10]; /* old frm file */ field_type= (enum_field_types) f_packtype(pack_flag); if (f_is_binary(pack_flag)) { /* Try to choose the best 4.1 type: - for 4.0 "CHAR(N) BINARY" or "VARCHAR(N) BINARY" try to find a binary collation for character set. - for other types (e.g. BLOB) just use my_charset_bin. */ if (!f_is_blob(pack_flag)) { // 3.23 or 4.0 string if (!(charset= get_charset_by_csname(share->table_charset->csname, MY_CS_BINSORT, MYF(0)))) charset= &my_charset_bin; } else charset= &my_charset_bin; } else charset= share->table_charset; bzero((char*) &comment, sizeof(comment)); } if (interval_nr && charset->mbminlen > 1) { /* Unescape UCS2 intervals from HEX notation */ TYPELIB *interval= share->intervals + interval_nr - 1; unhex_type2(interval); } #ifndef TO_BE_DELETED_ON_PRODUCTION if (field_type == MYSQL_TYPE_NEWDECIMAL && !share->mysql_version) { /* Fix pack length of old decimal values from 5.0.3 -> 5.0.4 The difference is that in the old version we stored precision in the .frm table while we now store the display_length */ uint decimals= f_decimals(pack_flag); field_length= my_decimal_precision_to_length(field_length, decimals, f_is_dec(pack_flag) == 0); sql_print_error("Found incompatible DECIMAL field '%s' in %s; " "Please do \"ALTER TABLE '%s' FORCE\" to fix it!", share->fieldnames.type_names[i], share->table_name.str, share->table_name.str); push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_CRASHED_ON_USAGE, "Found incompatible DECIMAL field '%s' in %s; " "Please do \"ALTER TABLE '%s' FORCE\" to fix it!", share->fieldnames.type_names[i], share->table_name.str, share->table_name.str); share->crashed= 1; // Marker for CHECK TABLE } #endif *field_ptr= reg_field= make_field(share, record+recpos, (uint32) field_length, null_pos, null_bit_pos, pack_flag, field_type, charset, geom_type, (Field::utype) MTYP_TYPENR(unireg_type), (interval_nr ? share->intervals+interval_nr-1 : (TYPELIB*) 0), share->fieldnames.type_names[i]); if (!reg_field) // Not supported field type { error= 4; goto err; /* purecov: inspected */ } reg_field->field_index= i; reg_field->comment=comment; if (field_type == MYSQL_TYPE_BIT && !f_bit_as_char(pack_flag)) { if ((null_bit_pos+= field_length & 7) > 7) { null_pos++; null_bit_pos-= 8; } } if (!(reg_field->flags & NOT_NULL_FLAG)) { if (!(null_bit_pos= (null_bit_pos + 1) & 7)) null_pos++; } if (f_no_default(pack_flag)) reg_field->flags|= NO_DEFAULT_VALUE_FLAG; if (reg_field->unireg_check == Field::NEXT_NUMBER) share->found_next_number_field= field_ptr; if (share->timestamp_field == reg_field) share->timestamp_field_offset= i; if (use_hash) (void) my_hash_insert(&share->name_hash, (byte*) field_ptr); // never fail } *field_ptr=0; // End marker /* Fix key->name and key_part->field */ if (key_parts) { uint primary_key=(uint) (find_type((char*) primary_key_name, &share->keynames, 3) - 1); longlong ha_option= handler_file->ha_table_flags(); keyinfo= share->key_info; key_part= keyinfo->key_part; for (uint key=0 ; key < share->keys ; key++,keyinfo++) { uint usable_parts= 0; keyinfo->name=(char*) share->keynames.type_names[key]; /* Fix fulltext keys for old .frm files */ if (share->key_info[key].flags & HA_FULLTEXT) share->key_info[key].algorithm= HA_KEY_ALG_FULLTEXT; if (primary_key >= MAX_KEY && (keyinfo->flags & HA_NOSAME)) { /* If the UNIQUE key doesn't have NULL columns and is not a part key declare this as a primary key. */ primary_key=key; for (i=0 ; i < keyinfo->key_parts ;i++) { uint fieldnr= key_part[i].fieldnr; if (!fieldnr || share->field[fieldnr-1]->null_ptr || share->field[fieldnr-1]->key_length() != key_part[i].length) { primary_key=MAX_KEY; // Can't be used break; } } } for (i=0 ; i < keyinfo->key_parts ; key_part++,i++) { Field *field; if (new_field_pack_flag <= 1) key_part->fieldnr= (uint16) find_field(share->field, share->default_values, (uint) key_part->offset, (uint) key_part->length); if (!key_part->fieldnr) { error= 4; // Wrong file goto err; } field= key_part->field= share->field[key_part->fieldnr-1]; key_part->type= field->key_type(); if (field->null_ptr) { key_part->null_offset=(uint) ((byte*) field->null_ptr - share->default_values); key_part->null_bit= field->null_bit; key_part->store_length+=HA_KEY_NULL_LENGTH; keyinfo->flags|=HA_NULL_PART_KEY; keyinfo->extra_length+= HA_KEY_NULL_LENGTH; keyinfo->key_length+= HA_KEY_NULL_LENGTH; } if (field->type() == MYSQL_TYPE_BLOB || field->real_type() == MYSQL_TYPE_VARCHAR) { if (field->type() == MYSQL_TYPE_BLOB) key_part->key_part_flag|= HA_BLOB_PART; else key_part->key_part_flag|= HA_VAR_LENGTH_PART; keyinfo->extra_length+=HA_KEY_BLOB_LENGTH; key_part->store_length+=HA_KEY_BLOB_LENGTH; keyinfo->key_length+= HA_KEY_BLOB_LENGTH; /* Mark that there may be many matching values for one key combination ('a', 'a ', 'a '...) */ if (!(field->flags & BINARY_FLAG)) keyinfo->flags|= HA_END_SPACE_KEY; } if (field->type() == MYSQL_TYPE_BIT) key_part->key_part_flag|= HA_BIT_PART; if (i == 0 && key != primary_key) field->flags |= (((keyinfo->flags & HA_NOSAME) && (keyinfo->key_parts == 1)) ? UNIQUE_KEY_FLAG : MULTIPLE_KEY_FLAG); if (i == 0) field->key_start.set_bit(key); if (field->key_length() == key_part->length && !(field->flags & BLOB_FLAG)) { if (handler_file->index_flags(key, i, 0) & HA_KEYREAD_ONLY) { share->keys_for_keyread.set_bit(key); field->part_of_key.set_bit(key); field->part_of_key_not_clustered.set_bit(key); } if (handler_file->index_flags(key, i, 1) & HA_READ_ORDER) field->part_of_sortkey.set_bit(key); } if (!(key_part->key_part_flag & HA_REVERSE_SORT) && usable_parts == i) usable_parts++; // For FILESORT field->flags|= PART_KEY_FLAG; if (key == primary_key) { field->flags|= PRI_KEY_FLAG; /* If this field is part of the primary key and all keys contains the primary key, then we can use any key to find this column */ if (ha_option & HA_PRIMARY_KEY_IN_READ_INDEX) field->part_of_key= share->keys_in_use; } if (field->key_length() != key_part->length) { #ifndef TO_BE_DELETED_ON_PRODUCTION if (field->type() == MYSQL_TYPE_NEWDECIMAL) { /* Fix a fatal error in decimal key handling that causes crashes on Innodb. We fix it by reducing the key length so that InnoDB never gets a too big key when searching. This allows the end user to do an ALTER TABLE to fix the error. */ keyinfo->key_length-= (key_part->length - field->key_length()); key_part->store_length-= (uint16)(key_part->length - field->key_length()); key_part->length= (uint16)field->key_length(); sql_print_error("Found wrong key definition in %s; " "Please do \"ALTER TABLE '%s' FORCE \" to fix it!", share->table_name.str, share->table_name.str); push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_CRASHED_ON_USAGE, "Found wrong key definition in %s; " "Please do \"ALTER TABLE '%s' FORCE\" to fix " "it!", share->table_name.str, share->table_name.str); share->crashed= 1; // Marker for CHECK TABLE goto to_be_deleted; } #endif key_part->key_part_flag|= HA_PART_KEY_SEG; } to_be_deleted: /* If the field can be NULL, don't optimize away the test key_part_column = expression from the WHERE clause as we need to test for NULL = NULL. */ if (field->real_maybe_null()) key_part->key_part_flag|= HA_NULL_PART; } keyinfo->usable_key_parts= usable_parts; // Filesort set_if_bigger(share->max_key_length,keyinfo->key_length+ keyinfo->key_parts); share->total_key_length+= keyinfo->key_length; /* MERGE tables do not have unique indexes. But every key could be an unique index on the underlying MyISAM table. (Bug #10400) */ if ((keyinfo->flags & HA_NOSAME) || (ha_option & HA_ANY_INDEX_MAY_BE_UNIQUE)) set_if_bigger(share->max_unique_length,keyinfo->key_length); } if (primary_key < MAX_KEY && (share->keys_in_use.is_set(primary_key))) { share->primary_key= primary_key; /* If we are using an integer as the primary key then allow the user to refer to it as '_rowid' */ if (share->key_info[primary_key].key_parts == 1) { Field *field= share->key_info[primary_key].key_part[0].field; if (field && field->result_type() == INT_RESULT) { /* note that fieldnr here (and rowid_field_offset) starts from 1 */ share->rowid_field_offset= (share->key_info[primary_key].key_part[0]. fieldnr); } } } else share->primary_key = MAX_KEY; // we do not have a primary key } else share->primary_key= MAX_KEY; x_free((gptr) disk_buff); disk_buff=0; if (new_field_pack_flag <= 1) { /* Old file format with default as not null */ uint null_length= (share->null_fields+7)/8; bfill(share->default_values + (null_flags - (uchar*) record), null_length, 255); } if (share->found_next_number_field) { reg_field= *share->found_next_number_field; if ((int) (share->next_number_index= (uint) find_ref_key(share->key_info, share->keys, share->default_values, reg_field, &share->next_number_key_offset)) < 0) { /* Wrong field definition */ DBUG_ASSERT(0); reg_field->unireg_check= Field::NONE; /* purecov: inspected */ share->found_next_number_field= 0; } else reg_field->flags |= AUTO_INCREMENT_FLAG; } if (share->blob_fields) { Field **ptr; uint k, *save; /* Store offsets to blob fields to find them fast */ if (!(share->blob_field= save= (uint*) alloc_root(&share->mem_root, (uint) (share->blob_fields* sizeof(uint))))) goto err; for (k=0, ptr= share->field ; *ptr ; ptr++, k++) { if ((*ptr)->flags & BLOB_FLAG) (*save++)= k; } } /* the correct null_bytes can now be set, since bitfields have been taken into account */ share->null_bytes= (null_pos - (uchar*) null_flags + (null_bit_pos + 7) / 8); share->last_null_bit_pos= null_bit_pos; share->db_low_byte_first= handler_file->low_byte_first(); share->column_bitmap_size= bitmap_buffer_size(share->fields); if (!(bitmaps= (my_bitmap_map*) alloc_root(&share->mem_root, share->column_bitmap_size))) goto err; bitmap_init(&share->all_set, bitmaps, share->fields, FALSE); bitmap_set_all(&share->all_set); delete handler_file; #ifndef DBUG_OFF if (use_hash) (void) hash_check(&share->name_hash); #endif DBUG_RETURN (0); err: share->error= error; share->open_errno= my_errno; share->errarg= errarg; x_free((gptr) disk_buff); delete crypted; delete handler_file; hash_free(&share->name_hash); open_table_error(share, error, share->open_errno, errarg); DBUG_RETURN(error); } /* open_binary_frm */ /* Open a table based on a TABLE_SHARE SYNOPSIS open_table_from_share() thd Thread handler share Table definition alias Alias for table db_stat open flags (for example HA_OPEN_KEYFILE| HA_OPEN_RNDFILE..) can be 0 (example in ha_example_table) prgflag READ_ALL etc.. ha_open_flags HA_OPEN_ABORT_IF_LOCKED etc.. outparam result table RETURN VALUES 0 ok 1 Error (see open_table_error) 2 Error (see open_table_error) 3 Wrong data in .frm file 4 Error (see open_table_error) 5 Error (see open_table_error: charset unavailable) 7 Table definition has changed in engine */ int open_table_from_share(THD *thd, TABLE_SHARE *share, const char *alias, uint db_stat, uint prgflag, uint ha_open_flags, TABLE *outparam, bool is_create_table) { int error; uint records, i, bitmap_size; bool error_reported= FALSE; byte *record, *bitmaps; Field **field_ptr; DBUG_ENTER("open_table_from_share"); DBUG_PRINT("enter",("name: '%s.%s' form: 0x%lx", share->db.str, share->table_name.str, (long) outparam)); error= 1; bzero((char*) outparam, sizeof(*outparam)); outparam->in_use= thd; outparam->s= share; outparam->db_stat= db_stat; outparam->write_row_record= NULL; init_sql_alloc(&outparam->mem_root, TABLE_ALLOC_BLOCK_SIZE, 0); if (!(outparam->alias= my_strdup(alias, MYF(MY_WME)))) goto err; outparam->quick_keys.init(); outparam->used_keys.init(); outparam->keys_in_use_for_query.init(); /* Allocate handler */ if (!(outparam->file= get_new_handler(share, &outparam->mem_root, share->db_type))) goto err; error= 4; outparam->reginfo.lock_type= TL_UNLOCK; outparam->current_lock= F_UNLCK; records=0; if ((db_stat & HA_OPEN_KEYFILE) || (prgflag & DELAYED_OPEN)) records=1; if (prgflag & (READ_ALL+EXTRA_RECORD)) records++; if (!(record= (byte*) alloc_root(&outparam->mem_root, share->rec_buff_length * records))) goto err; /* purecov: inspected */ if (records == 0) { /* We are probably in hard repair, and the buffers should not be used */ outparam->record[0]= outparam->record[1]= share->default_values; } else { outparam->record[0]= record; if (records > 1) outparam->record[1]= record+ share->rec_buff_length; else outparam->record[1]= outparam->record[0]; // Safety } #ifdef HAVE_purify /* We need this because when we read var-length rows, we are not updating bytes after end of varchar */ if (records > 1) { memcpy(outparam->record[0], share->default_values, share->rec_buff_length); memcpy(outparam->record[1], share->default_values, share->null_bytes); if (records > 2) memcpy(outparam->record[1], share->default_values, share->rec_buff_length); } #endif if (!(field_ptr = (Field **) alloc_root(&outparam->mem_root, (uint) ((share->fields+1)* sizeof(Field*))))) goto err; /* purecov: inspected */ outparam->field= field_ptr; record= (byte*) outparam->record[0]-1; /* Fieldstart = 1 */ if (share->null_field_first) outparam->null_flags= (uchar*) record+1; else outparam->null_flags= (uchar*) (record+ 1+ share->reclength - share->null_bytes); /* Setup copy of fields from share, but use the right alias and record */ for (i=0 ; i < share->fields; i++, field_ptr++) { if (!((*field_ptr)= share->field[i]->clone(&outparam->mem_root, outparam))) goto err; } (*field_ptr)= 0; // End marker if (share->found_next_number_field) outparam->found_next_number_field= outparam->field[(uint) (share->found_next_number_field - share->field)]; if (share->timestamp_field) outparam->timestamp_field= (Field_timestamp*) outparam->field[share->timestamp_field_offset]; /* Fix key->name and key_part->field */ if (share->key_parts) { KEY *key_info, *key_info_end; KEY_PART_INFO *key_part; uint n_length; n_length= share->keys*sizeof(KEY) + share->key_parts*sizeof(KEY_PART_INFO); if (!(key_info= (KEY*) alloc_root(&outparam->mem_root, n_length))) goto err; outparam->key_info= key_info; key_part= (my_reinterpret_cast(KEY_PART_INFO*) (key_info+share->keys)); memcpy(key_info, share->key_info, sizeof(*key_info)*share->keys); memcpy(key_part, share->key_info[0].key_part, (sizeof(*key_part) * share->key_parts)); for (key_info_end= key_info + share->keys ; key_info < key_info_end ; key_info++) { KEY_PART_INFO *key_part_end; key_info->table= outparam; key_info->key_part= key_part; for (key_part_end= key_part+ key_info->key_parts ; key_part < key_part_end ; key_part++) { Field *field= key_part->field= outparam->field[key_part->fieldnr-1]; if (field->key_length() != key_part->length && !(field->flags & BLOB_FLAG)) { /* We are using only a prefix of the column as a key: Create a new field for the key part that matches the index */ field= key_part->field=field->new_field(&outparam->mem_root, outparam, 0); field->field_length= key_part->length; } } } } #ifdef WITH_PARTITION_STORAGE_ENGINE if (share->partition_info_len) { /* In this execution we must avoid calling thd->change_item_tree since we might release memory before statement is completed. We do this by changing to a new statement arena. As part of this arena we also set the memory root to be the memory root of the table since we call the parser and fix_fields which both can allocate memory for item objects. We keep the arena to ensure that we can release the free_list when closing the table object. SEE Bug #21658 */ Query_arena *backup_stmt_arena_ptr= thd->stmt_arena; Query_arena backup_arena; Query_arena part_func_arena(&outparam->mem_root, Query_arena::INITIALIZED); thd->set_n_backup_active_arena(&part_func_arena, &backup_arena); thd->stmt_arena= &part_func_arena; bool tmp; tmp= mysql_unpack_partition(thd, share->partition_info, share->partition_info_len, (uchar*)share->part_state, share->part_state_len, outparam, is_create_table, share->default_part_db_type); outparam->part_info->is_auto_partitioned= share->auto_partitioned; DBUG_PRINT("info", ("autopartitioned: %u", share->auto_partitioned)); if (!tmp) tmp= fix_partition_func(thd, outparam, is_create_table); thd->stmt_arena= backup_stmt_arena_ptr; thd->restore_active_arena(&part_func_arena, &backup_arena); if (!tmp) outparam->part_info->item_free_list= part_func_arena.free_list; if (tmp) { if (is_create_table) { /* During CREATE/ALTER TABLE it is ok to receive errors here. It is not ok if it happens during the opening of an frm file as part of a normal query. */ error_reported= TRUE; } goto err; } } #endif /* Allocate bitmaps */ bitmap_size= share->column_bitmap_size; if (!(bitmaps= (byte*) alloc_root(&outparam->mem_root, bitmap_size*3))) goto err; bitmap_init(&outparam->def_read_set, (my_bitmap_map*) bitmaps, share->fields, FALSE); bitmap_init(&outparam->def_write_set, (my_bitmap_map*) (bitmaps+bitmap_size), share->fields, FALSE); bitmap_init(&outparam->tmp_set, (my_bitmap_map*) (bitmaps+bitmap_size*2), share->fields, FALSE); outparam->default_column_bitmaps(); /* The table struct is now initialized; Open the table */ error= 2; if (db_stat) { int ha_err; if ((ha_err= (outparam->file-> ha_open(outparam, share->normalized_path.str, (db_stat & HA_READ_ONLY ? O_RDONLY : O_RDWR), (db_stat & HA_OPEN_TEMPORARY ? HA_OPEN_TMP_TABLE : ((db_stat & HA_WAIT_IF_LOCKED) || (specialflag & SPECIAL_WAIT_IF_LOCKED)) ? HA_OPEN_WAIT_IF_LOCKED : (db_stat & (HA_ABORT_IF_LOCKED | HA_GET_INFO)) ? HA_OPEN_ABORT_IF_LOCKED : HA_OPEN_IGNORE_IF_LOCKED) | ha_open_flags)))) { /* Set a flag if the table is crashed and it can be auto. repaired */ share->crashed= ((ha_err == HA_ERR_CRASHED_ON_USAGE) && outparam->file->auto_repair() && !(ha_open_flags & HA_OPEN_FOR_REPAIR)); switch (ha_err) { case HA_ERR_NO_SUCH_TABLE: /* The table did not exists in storage engine, use same error message as if the .frm file didn't exist */ error= 1; my_errno= ENOENT; break; case EMFILE: /* Too many files opened, use same error message as if the .frm file can't open */ DBUG_PRINT("error", ("open file: %s failed, too many files opened (errno: %d)", share->normalized_path.str, ha_err)); error= 1; my_errno= EMFILE; break; default: outparam->file->print_error(ha_err, MYF(0)); error_reported= TRUE; if (ha_err == HA_ERR_TABLE_DEF_CHANGED) error= 7; break; } goto err; /* purecov: inspected */ } } #if defined(HAVE_purify) && !defined(DBUG_OFF) bzero((char*) bitmaps, bitmap_size*3); #endif thd->status_var.opened_tables++; DBUG_RETURN (0); err: if (! error_reported) open_table_error(share, error, my_errno, 0); delete outparam->file; #ifdef WITH_PARTITION_STORAGE_ENGINE if (outparam->part_info) free_items(outparam->part_info->item_free_list); #endif outparam->file= 0; // For easier error checking outparam->db_stat=0; free_root(&outparam->mem_root, MYF(0)); // Safe to call on bzero'd root my_free((char*) outparam->alias, MYF(MY_ALLOW_ZERO_PTR)); DBUG_RETURN (error); } /* Free information allocated by openfrm SYNOPSIS closefrm() table TABLE object to free free_share Is 1 if we also want to free table_share */ int closefrm(register TABLE *table, bool free_share) { int error=0; uint idx; KEY *key_info; DBUG_ENTER("closefrm"); DBUG_PRINT("enter", ("table: 0x%lx", (long) table)); if (table->db_stat) error=table->file->close(); key_info= table->key_info; for (idx= table->s->keys; idx; idx--, key_info++) { if (key_info->flags & HA_USES_PARSER) { plugin_unlock(key_info->parser); key_info->flags= 0; } } my_free((char*) table->alias, MYF(MY_ALLOW_ZERO_PTR)); table->alias= 0; if (table->field) { for (Field **ptr=table->field ; *ptr ; ptr++) delete *ptr; table->field= 0; } delete table->file; table->file= 0; /* For easier errorchecking */ #ifdef WITH_PARTITION_STORAGE_ENGINE if (table->part_info) { free_items(table->part_info->item_free_list); table->part_info->item_free_list= 0; table->part_info= 0; } #endif if (free_share) { if (table->s->tmp_table == NO_TMP_TABLE) release_table_share(table->s, RELEASE_NORMAL); else free_table_share(table->s); } free_root(&table->mem_root, MYF(0)); DBUG_RETURN(error); } /* Deallocate temporary blob storage */ void free_blobs(register TABLE *table) { uint *ptr, *end; for (ptr= table->s->blob_field, end=ptr + table->s->blob_fields ; ptr != end ; ptr++) ((Field_blob*) table->field[*ptr])->free(); } /* Find where a form starts */ /* if formname is NullS then only formnames is read */ ulong get_form_pos(File file, uchar *head, TYPELIB *save_names) { uint a_length,names,length; uchar *pos,*buf; ulong ret_value=0; DBUG_ENTER("get_form_pos"); names=uint2korr(head+8); a_length=(names+2)*sizeof(my_string); /* Room for two extra */ if (!save_names) a_length=0; else save_names->type_names=0; /* Clear if error */ if (names) { length=uint2korr(head+4); VOID(my_seek(file,64L,MY_SEEK_SET,MYF(0))); if (!(buf= (uchar*) my_malloc((uint) length+a_length+names*4, MYF(MY_WME))) || my_read(file,(byte*) buf+a_length,(uint) (length+names*4), MYF(MY_NABP))) { /* purecov: inspected */ x_free((gptr) buf); /* purecov: inspected */ DBUG_RETURN(0L); /* purecov: inspected */ } pos= buf+a_length+length; ret_value=uint4korr(pos); } if (! save_names) { if (names) my_free((gptr) buf,MYF(0)); } else if (!names) bzero((char*) save_names,sizeof(save_names)); else { char *str; str=(char *) (buf+a_length); fix_type_pointers((const char ***) &buf,save_names,1,&str); } DBUG_RETURN(ret_value); } /* Read string from a file with malloc */ int read_string(File file, gptr *to, uint length) { DBUG_ENTER("read_string"); x_free((gptr) *to); if (!(*to= (gptr) my_malloc(length+1,MYF(MY_WME))) || my_read(file,(byte*) *to,length,MYF(MY_NABP))) { x_free((gptr) *to); /* purecov: inspected */ *to= 0; /* purecov: inspected */ DBUG_RETURN(1); /* purecov: inspected */ } *((char*) *to+length)= '\0'; DBUG_RETURN (0); } /* read_string */ /* Add a new form to a form file */ ulong make_new_entry(File file, uchar *fileinfo, TYPELIB *formnames, const char *newname) { uint i,bufflength,maxlength,n_length,length,names; ulong endpos,newpos; char buff[IO_SIZE]; uchar *pos; DBUG_ENTER("make_new_entry"); length=(uint) strlen(newname)+1; n_length=uint2korr(fileinfo+4); maxlength=uint2korr(fileinfo+6); names=uint2korr(fileinfo+8); newpos=uint4korr(fileinfo+10); if (64+length+n_length+(names+1)*4 > maxlength) { /* Expand file */ newpos+=IO_SIZE; int4store(fileinfo+10,newpos); endpos=(ulong) my_seek(file,0L,MY_SEEK_END,MYF(0));/* Copy from file-end */ bufflength= (uint) (endpos & (IO_SIZE-1)); /* IO_SIZE is a power of 2 */ while (endpos > maxlength) { VOID(my_seek(file,(ulong) (endpos-bufflength),MY_SEEK_SET,MYF(0))); if (my_read(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME))) DBUG_RETURN(0L); VOID(my_seek(file,(ulong) (endpos-bufflength+IO_SIZE),MY_SEEK_SET, MYF(0))); if ((my_write(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME)))) DBUG_RETURN(0); endpos-=bufflength; bufflength=IO_SIZE; } bzero(buff,IO_SIZE); /* Null new block */ VOID(my_seek(file,(ulong) maxlength,MY_SEEK_SET,MYF(0))); if (my_write(file,(byte*) buff,bufflength,MYF(MY_NABP+MY_WME))) DBUG_RETURN(0L); maxlength+=IO_SIZE; /* Fix old ref */ int2store(fileinfo+6,maxlength); for (i=names, pos= (uchar*) *formnames->type_names+n_length-1; i-- ; pos+=4) { endpos=uint4korr(pos)+IO_SIZE; int4store(pos,endpos); } } if (n_length == 1 ) { /* First name */ length++; VOID(strxmov(buff,"/",newname,"/",NullS)); } else VOID(strxmov(buff,newname,"/",NullS)); /* purecov: inspected */ VOID(my_seek(file,63L+(ulong) n_length,MY_SEEK_SET,MYF(0))); if (my_write(file,(byte*) buff,(uint) length+1,MYF(MY_NABP+MY_WME)) || (names && my_write(file,(byte*) (*formnames->type_names+n_length-1), names*4, MYF(MY_NABP+MY_WME))) || my_write(file,(byte*) fileinfo+10,(uint) 4,MYF(MY_NABP+MY_WME))) DBUG_RETURN(0L); /* purecov: inspected */ int2store(fileinfo+8,names+1); int2store(fileinfo+4,n_length+length); VOID(my_chsize(file, newpos, 0, MYF(MY_WME)));/* Append file with '\0' */ DBUG_RETURN(newpos); } /* make_new_entry */ /* error message when opening a form file */ void open_table_error(TABLE_SHARE *share, int error, int db_errno, int errarg) { int err_no; char buff[FN_REFLEN]; myf errortype= ME_ERROR+ME_WAITTANG; DBUG_ENTER("open_table_error"); switch (error) { case 7: case 1: if (db_errno == ENOENT) my_error(ER_NO_SUCH_TABLE, MYF(0), share->db.str, share->table_name.str); else { strxmov(buff, share->normalized_path.str, reg_ext, NullS); my_error((db_errno == EMFILE) ? ER_CANT_OPEN_FILE : ER_FILE_NOT_FOUND, errortype, buff, db_errno); } break; case 2: { handler *file= 0; const char *datext= ""; if (share->db_type != NULL) { if ((file= get_new_handler(share, current_thd->mem_root, share->db_type))) { if (!(datext= *file->bas_ext())) datext= ""; } } err_no= (db_errno == ENOENT) ? ER_FILE_NOT_FOUND : (db_errno == EAGAIN) ? ER_FILE_USED : ER_CANT_OPEN_FILE; strxmov(buff, share->normalized_path.str, datext, NullS); my_error(err_no,errortype, buff, db_errno); delete file; break; } case 5: { const char *csname= get_charset_name((uint) errarg); char tmp[10]; if (!csname || csname[0] =='?') { my_snprintf(tmp, sizeof(tmp), "#%d", errarg); csname= tmp; } my_printf_error(ER_UNKNOWN_COLLATION, "Unknown collation '%s' in table '%-.64s' definition", MYF(0), csname, share->table_name.str); break; } case 6: strxmov(buff, share->normalized_path.str, reg_ext, NullS); my_printf_error(ER_NOT_FORM_FILE, "Table '%-.64s' was created with a different version " "of MySQL and cannot be read", MYF(0), buff); break; default: /* Better wrong error than none */ case 4: strxmov(buff, share->normalized_path.str, reg_ext, NullS); my_error(ER_NOT_FORM_FILE, errortype, buff, 0); break; } DBUG_VOID_RETURN; } /* open_table_error */ /* ** fix a str_type to a array type ** typeparts separated with some char. differents types are separated ** with a '\0' */ static void fix_type_pointers(const char ***array, TYPELIB *point_to_type, uint types, char **names) { char *type_name, *ptr; char chr; ptr= *names; while (types--) { point_to_type->name=0; point_to_type->type_names= *array; if ((chr= *ptr)) /* Test if empty type */ { while ((type_name=strchr(ptr+1,chr)) != NullS) { *((*array)++) = ptr+1; *type_name= '\0'; /* End string */ ptr=type_name; } ptr+=2; /* Skip end mark and last 0 */ } else ptr++; point_to_type->count= (uint) (*array - point_to_type->type_names); point_to_type++; *((*array)++)= NullS; /* End of type */ } *names=ptr; /* Update end */ return; } /* fix_type_pointers */ TYPELIB *typelib(MEM_ROOT *mem_root, List &strings) { TYPELIB *result= (TYPELIB*) alloc_root(mem_root, sizeof(TYPELIB)); if (!result) return 0; result->count=strings.elements; result->name=""; uint nbytes= (sizeof(char*) + sizeof(uint)) * (result->count + 1); if (!(result->type_names= (const char**) alloc_root(mem_root, nbytes))) return 0; result->type_lengths= (uint*) (result->type_names + result->count + 1); List_iterator it(strings); String *tmp; for (uint i=0; (tmp=it++) ; i++) { result->type_names[i]= tmp->ptr(); result->type_lengths[i]= tmp->length(); } result->type_names[result->count]= 0; // End marker result->type_lengths[result->count]= 0; return result; } /* Search after a field with given start & length If an exact field isn't found, return longest field with starts at right position. NOTES This is needed because in some .frm fields 'fieldnr' was saved wrong RETURN 0 error # field number +1 */ static uint find_field(Field **fields, byte *record, uint start, uint length) { Field **field; uint i, pos; pos= 0; for (field= fields, i=1 ; *field ; i++,field++) { if ((*field)->offset(record) == start) { if ((*field)->key_length() == length) return (i); if (!pos || fields[pos-1]->pack_length() < (*field)->pack_length()) pos= i; } } return (pos); } /* Check that the integer is in the internal */ int set_zone(register int nr, int min_zone, int max_zone) { if (nr<=min_zone) return (min_zone); if (nr>=max_zone) return (max_zone); return (nr); } /* set_zone */ /* Adjust number to next larger disk buffer */ ulong next_io_size(register ulong pos) { reg2 ulong offset; if ((offset= pos & (IO_SIZE-1))) return pos-offset+IO_SIZE; return pos; } /* next_io_size */ /* Store an SQL quoted string. SYNOPSIS append_unescaped() res result String pos string to be quoted length it's length NOTE This function works correctly with utf8 or single-byte charset strings. May fail with some multibyte charsets though. */ void append_unescaped(String *res, const char *pos, uint length) { const char *end= pos+length; res->append('\''); for (; pos != end ; pos++) { #if defined(USE_MB) && MYSQL_VERSION_ID < 40100 uint mblen; if (use_mb(default_charset_info) && (mblen= my_ismbchar(default_charset_info, pos, end))) { res->append(pos, mblen); pos+= mblen; continue; } #endif switch (*pos) { case 0: /* Must be escaped for 'mysql' */ res->append('\\'); res->append('0'); break; case '\n': /* Must be escaped for logs */ res->append('\\'); res->append('n'); break; case '\r': res->append('\\'); /* This gives better readability */ res->append('r'); break; case '\\': res->append('\\'); /* Because of the sql syntax */ res->append('\\'); break; case '\'': res->append('\''); /* Because of the sql syntax */ res->append('\''); break; default: res->append(*pos); break; } } res->append('\''); } /* Create a .frm file */ File create_frm(THD *thd, const char *name, const char *db, const char *table, uint reclength, uchar *fileinfo, HA_CREATE_INFO *create_info, uint keys) { register File file; ulong length; char fill[IO_SIZE]; int create_flags= O_RDWR | O_TRUNC; if (create_info->options & HA_LEX_CREATE_TMP_TABLE) create_flags|= O_EXCL | O_NOFOLLOW; /* Fix this when we have new .frm files; Current limit is 4G rows (QQ) */ if (create_info->max_rows > UINT_MAX32) create_info->max_rows= UINT_MAX32; if (create_info->min_rows > UINT_MAX32) create_info->min_rows= UINT_MAX32; if ((file= my_create(name, CREATE_MODE, create_flags, MYF(0))) >= 0) { uint key_length, tmp_key_length; uint tmp; bzero((char*) fileinfo,64); /* header */ fileinfo[0]=(uchar) 254; fileinfo[1]= 1; fileinfo[2]= FRM_VER+3+ test(create_info->varchar); fileinfo[3]= (uchar) ha_legacy_type( ha_checktype(thd,ha_legacy_type(create_info->db_type),0,0)); fileinfo[4]=1; int2store(fileinfo+6,IO_SIZE); /* Next block starts here */ key_length=keys*(7+NAME_LEN+MAX_REF_PARTS*9)+16; length= next_io_size((ulong) (IO_SIZE+key_length+reclength+ create_info->extra_size)); int4store(fileinfo+10,length); tmp_key_length= (key_length < 0xffff) ? key_length : 0xffff; int2store(fileinfo+14,tmp_key_length); int2store(fileinfo+16,reclength); int4store(fileinfo+18,create_info->max_rows); int4store(fileinfo+22,create_info->min_rows); /* fileinfo[26] is set in mysql_create_frm() */ fileinfo[27]=2; // Use long pack-fields /* fileinfo[28 & 29] is set to key_info_length in mysql_create_frm() */ create_info->table_options|=HA_OPTION_LONG_BLOB_PTR; // Use portable blob pointers int2store(fileinfo+30,create_info->table_options); fileinfo[32]=0; // No filename anymore fileinfo[33]=5; // Mark for 5.0 frm file int4store(fileinfo+34,create_info->avg_row_length); fileinfo[38]= (create_info->default_table_charset ? create_info->default_table_charset->number : 0); fileinfo[39]= (uchar) create_info->transactional; fileinfo[40]= (uchar) create_info->row_type; /* Next few bytes where for RAID support */ fileinfo[41]= 0; fileinfo[42]= 0; fileinfo[43]= 0; fileinfo[44]= 0; fileinfo[45]= 0; fileinfo[46]= 0; int4store(fileinfo+47, key_length); tmp= MYSQL_VERSION_ID; // Store to avoid warning from int4store int4store(fileinfo+51, tmp); int4store(fileinfo+55, create_info->extra_size); /* 59-60 is reserved for extra_rec_buf_length, 61 for default_part_db_type */ int2store(fileinfo+62, create_info->key_block_size); bzero(fill,IO_SIZE); for (; length > IO_SIZE ; length-= IO_SIZE) { if (my_write(file,(byte*) fill,IO_SIZE,MYF(MY_WME | MY_NABP))) { VOID(my_close(file,MYF(0))); VOID(my_delete(name,MYF(0))); return(-1); } } } else { if (my_errno == ENOENT) my_error(ER_BAD_DB_ERROR,MYF(0),db); else my_error(ER_CANT_CREATE_TABLE,MYF(0),table,my_errno); } return (file); } /* create_frm */ void update_create_info_from_table(HA_CREATE_INFO *create_info, TABLE *table) { TABLE_SHARE *share= table->s; DBUG_ENTER("update_create_info_from_table"); create_info->max_rows= share->max_rows; create_info->min_rows= share->min_rows; create_info->table_options= share->db_create_options; create_info->avg_row_length= share->avg_row_length; create_info->row_type= share->row_type; create_info->default_table_charset= share->table_charset; create_info->table_charset= 0; DBUG_VOID_RETURN; } int rename_file_ext(const char * from,const char * to,const char * ext) { char from_b[FN_REFLEN],to_b[FN_REFLEN]; VOID(strxmov(from_b,from,ext,NullS)); VOID(strxmov(to_b,to,ext,NullS)); return (my_rename(from_b,to_b,MYF(MY_WME))); } /* Allocate string field in MEM_ROOT and return it as String SYNOPSIS get_field() mem MEM_ROOT for allocating field Field for retrieving of string res result String RETURN VALUES 1 string is empty 0 all ok */ bool get_field(MEM_ROOT *mem, Field *field, String *res) { char buff[MAX_FIELD_WIDTH], *to; String str(buff,sizeof(buff),&my_charset_bin); uint length; field->val_str(&str); if (!(length= str.length())) { res->length(0); return 1; } if (!(to= strmake_root(mem, str.ptr(), length))) length= 0; // Safety fix res->set(to, length, ((Field_str*)field)->charset()); return 0; } /* Allocate string field in MEM_ROOT and return it as NULL-terminated string SYNOPSIS get_field() mem MEM_ROOT for allocating field Field for retrieving of string RETURN VALUES NullS string is empty # pointer to NULL-terminated string value of field */ char *get_field(MEM_ROOT *mem, Field *field) { char buff[MAX_FIELD_WIDTH], *to; String str(buff,sizeof(buff),&my_charset_bin); uint length; field->val_str(&str); length= str.length(); if (!length || !(to= (char*) alloc_root(mem,length+1))) return NullS; memcpy(to,str.ptr(),(uint) length); to[length]=0; return to; } /* Check if database name is valid SYNPOSIS check_db_name() org_name Name of database and length NOTES If lower_case_table_names is set then database is converted to lower case RETURN 0 ok 1 error */ bool check_db_name(LEX_STRING *org_name) { char *name= org_name->str; if (!org_name->length || org_name->length > NAME_LEN) return 1; if (lower_case_table_names && name != any_db) my_casedn_str(files_charset_info, name); #if defined(USE_MB) && defined(USE_MB_IDENT) if (use_mb(system_charset_info)) { bool last_char_is_space= TRUE; char *end= name + org_name->length; while (name < end) { int len; last_char_is_space= my_isspace(system_charset_info, *name); len= my_ismbchar(system_charset_info, name, end); if (!len) len= 1; name+= len; } return last_char_is_space; } else #endif return org_name->str[org_name->length - 1] != ' '; /* purecov: inspected */ } /* Allow anything as a table name, as long as it doesn't contain an ' ' at the end returns 1 on error */ bool check_table_name(const char *name, uint length) { const char *end= name+length; if (!length || length > NAME_LEN) return 1; #if defined(USE_MB) && defined(USE_MB_IDENT) bool last_char_is_space= FALSE; #else if (name[length-1]==' ') return 1; #endif while (name != end) { #if defined(USE_MB) && defined(USE_MB_IDENT) last_char_is_space= my_isspace(system_charset_info, *name); if (use_mb(system_charset_info)) { int len=my_ismbchar(system_charset_info, name, end); if (len) { name += len; continue; } } #endif name++; } #if defined(USE_MB) && defined(USE_MB_IDENT) return last_char_is_space; #else return 0; #endif } bool check_column_name(const char *name) { const char *start= name; bool last_char_is_space= TRUE; while (*name) { #if defined(USE_MB) && defined(USE_MB_IDENT) last_char_is_space= my_isspace(system_charset_info, *name); if (use_mb(system_charset_info)) { int len=my_ismbchar(system_charset_info, name, name+system_charset_info->mbmaxlen); if (len) { name += len; continue; } } #else last_char_is_space= *name==' '; #endif if (*name == NAMES_SEP_CHAR) return 1; name++; } /* Error if empty or too long column name */ return last_char_is_space || (uint) (name - start) > NAME_LEN; } /* Checks whether a table is intact. Should be done *just* after the table has been opened. SYNOPSIS table_check_intact() table The table to check table_f_count Expected number of columns in the table table_def Expected structure of the table (column name and type) last_create_time The table->file->create_time of the table in memory we have checked last time error_num ER_XXXX from the error messages file. When 0 no error is sent to the client in case types does not match. If different col number either ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE or ER_COL_COUNT_DOESNT_MATCH_CORRUPTED is used RETURNS FALSE OK TRUE There was an error */ my_bool table_check_intact(TABLE *table, const uint table_f_count, const TABLE_FIELD_W_TYPE *table_def, time_t *last_create_time, int error_num) { uint i; my_bool error= FALSE; my_bool fields_diff_count; DBUG_ENTER("table_check_intact"); DBUG_PRINT("info",("table: %s expected_count: %d last_create_time: %ld", table->alias, table_f_count, *last_create_time)); if ((fields_diff_count= (table->s->fields != table_f_count)) || (*last_create_time != table->file->stats.create_time)) { DBUG_PRINT("info", ("I am suspecting, checking table")); if (fields_diff_count) { /* previous MySQL version */ error= TRUE; if (MYSQL_VERSION_ID > table->s->mysql_version) { my_error(ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE, MYF(0), table->alias, table_f_count, table->s->fields, table->s->mysql_version, MYSQL_VERSION_ID); sql_print_error(ER(ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE), table->alias, table_f_count, table->s->fields, table->s->mysql_version, MYSQL_VERSION_ID); DBUG_RETURN(error); } else if (MYSQL_VERSION_ID == table->s->mysql_version) { my_error(ER_COL_COUNT_DOESNT_MATCH_CORRUPTED,MYF(0), table->alias, table_f_count, table->s->fields); sql_print_error(ER(ER_COL_COUNT_DOESNT_MATCH_CORRUPTED), table->alias, table_f_count, table->s->fields); } else { /* Moving from newer mysql to older one -> let's say not an error but will check the definition afterwards. If a column was added at the end then we don't care much since it's not in the middle. */ error= FALSE; } } /* definitely something has changed */ char buffer[255]; for (i=0 ; i < table_f_count; i++, table_def++) { String sql_type(buffer, sizeof(buffer), system_charset_info); sql_type.length(0); /* Name changes are not fatal, we use sequence numbers => no problem for us but this can show tampered table or broken table. */ if (i < table->s->fields) { Field *field= table->field[i]; if (strncmp(field->field_name, table_def->name.str, table_def->name.length)) { sql_print_error("(%s) Expected field %s at position %d, found %s", table->alias, table_def->name.str, i, field->field_name); } /* If the type does not match than something is really wrong Check up to length - 1. Why? 1. datetime -> datetim -> the same 2. int(11) -> int(11 -> the same 3. set('one','two') -> set('one','two' so for sets if the same prefix is there it's ok if more are added as part of the set. The same is valid for enum. So a new table running on a old server will be valid. */ field->sql_type(sql_type); if (strncmp(sql_type.c_ptr_safe(), table_def->type.str, table_def->type.length - 1)) { sql_print_error("(%s) Expected field %s at position %d to have type " "%s, found %s", table->alias, table_def->name.str, i, table_def->type.str, sql_type.c_ptr_safe()); error= TRUE; } else if (table_def->cset.str && !field->has_charset()) { sql_print_error("(%s) Expected field %s at position %d to have " "character set '%s' but found no such", table->alias, table_def->name.str, i, table_def->cset.str); error= TRUE; } else if (table_def->cset.str && strcmp(field->charset()->csname, table_def->cset.str)) { sql_print_error("(%s) Expected field %s at position %d to have " "character set '%s' but found '%s'", table->alias, table_def->name.str, i, table_def->cset.str, field->charset()->csname); error= TRUE; } } else { sql_print_error("(%s) Expected field %s at position %d to have type %s " " but no field found.", table->alias, table_def->name.str, i, table_def->type.str); error= TRUE; } } if (!error) *last_create_time= table->file->stats.create_time; else if (!fields_diff_count && error_num) my_error(error_num,MYF(0), table->alias, table_f_count, table->s->fields); } else { DBUG_PRINT("info", ("Table seems ok without thorough checking.")); *last_create_time= table->file->stats.create_time; } DBUG_RETURN(error); } /* Create Item_field for each column in the table. SYNPOSIS st_table::fill_item_list() item_list a pointer to an empty list used to store items DESCRIPTION Create Item_field object for each column in the table and initialize it with the corresponding Field. New items are created in the current THD memory root. RETURN VALUE 0 success 1 out of memory */ bool st_table::fill_item_list(List *item_list) const { /* All Item_field's created using a direct pointer to a field are fixed in Item_field constructor. */ for (Field **ptr= field; *ptr; ptr++) { Item_field *item= new Item_field(*ptr); if (!item || item_list->push_back(item)) return TRUE; } return FALSE; } /* Reset an existing list of Item_field items to point to the Fields of this table. SYNPOSIS st_table::fill_item_list() item_list a non-empty list with Item_fields DESCRIPTION This is a counterpart of fill_item_list used to redirect Item_fields to the fields of a newly created table. The caller must ensure that number of items in the item_list is the same as the number of columns in the table. */ void st_table::reset_item_list(List *item_list) const { List_iterator_fast it(*item_list); for (Field **ptr= field; *ptr; ptr++) { Item_field *item_field= (Item_field*) it++; DBUG_ASSERT(item_field != 0); item_field->reset_field(*ptr); } } /* calculate md5 of query SYNOPSIS st_table_list::calc_md5() buffer buffer for md5 writing */ void st_table_list::calc_md5(char *buffer) { my_MD5_CTX context; uchar digest[16]; my_MD5Init(&context); my_MD5Update(&context,(uchar *) query.str, query.length); my_MD5Final(digest, &context); sprintf((char *) buffer, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", digest[0], digest[1], digest[2], digest[3], digest[4], digest[5], digest[6], digest[7], digest[8], digest[9], digest[10], digest[11], digest[12], digest[13], digest[14], digest[15]); } /* set underlying TABLE for table place holder of VIEW DESCRIPTION Replace all views that only uses one table with the table itself. This allows us to treat the view as a simple table and even update it (it is a kind of optimisation) SYNOPSIS st_table_list::set_underlying_merge() */ void st_table_list::set_underlying_merge() { TABLE_LIST *tbl; if ((tbl= merge_underlying_list)) { /* This is a view. Process all tables of view */ DBUG_ASSERT(view && effective_algorithm == VIEW_ALGORITHM_MERGE); do { if (tbl->merge_underlying_list) // This is a view { DBUG_ASSERT(tbl->view && tbl->effective_algorithm == VIEW_ALGORITHM_MERGE); /* This is the only case where set_ancestor is called on an object that may not be a view (in which case ancestor is 0) */ tbl->merge_underlying_list->set_underlying_merge(); } } while ((tbl= tbl->next_local)); if (!multitable_view) { table= merge_underlying_list->table; schema_table= merge_underlying_list->schema_table; } } } /* setup fields of placeholder of merged VIEW SYNOPSIS st_table_list::setup_underlying() thd - thread handler DESCRIPTION It is: - preparing translation table for view columns If there are underlying view(s) procedure first will be called for them. RETURN FALSE - OK TRUE - error */ bool st_table_list::setup_underlying(THD *thd) { DBUG_ENTER("st_table_list::setup_underlying"); if (!field_translation && merge_underlying_list) { Field_translator *transl; SELECT_LEX *select= &view->select_lex; Item *item; TABLE_LIST *tbl; List_iterator_fast it(select->item_list); uint field_count= 0; if (check_stack_overrun(thd, STACK_MIN_SIZE, (char *)&field_count)) { DBUG_RETURN(TRUE); } for (tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { if (tbl->merge_underlying_list && tbl->setup_underlying(thd)) { DBUG_RETURN(TRUE); } } /* Create view fields translation table */ if (!(transl= (Field_translator*)(thd->stmt_arena-> alloc(select->item_list.elements * sizeof(Field_translator))))) { DBUG_RETURN(TRUE); } while ((item= it++)) { transl[field_count].name= item->name; transl[field_count++].item= item; } field_translation= transl; field_translation_end= transl + field_count; /* TODO: use hash for big number of fields */ /* full text function moving to current select */ if (view->select_lex.ftfunc_list->elements) { Item_func_match *ifm; SELECT_LEX *current_select= thd->lex->current_select; List_iterator_fast li(*(view->select_lex.ftfunc_list)); while ((ifm= li++)) current_select->ftfunc_list->push_front(ifm); } } DBUG_RETURN(FALSE); } /* Prepare where expression of view SYNOPSIS st_table_list::prep_where() thd - thread handler conds - condition of this JOIN no_where_clause - do not build WHERE or ON outer qwery do not need it (it is INSERT), we do not need conds if this flag is set NOTE: have to be called befor CHECK OPTION preparation, because it makes fix_fields for view WHERE clause RETURN FALSE - OK TRUE - error */ bool st_table_list::prep_where(THD *thd, Item **conds, bool no_where_clause) { DBUG_ENTER("st_table_list::prep_where"); for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { if (tbl->view && tbl->prep_where(thd, conds, no_where_clause)) { DBUG_RETURN(TRUE); } } if (where) { if (!where->fixed && where->fix_fields(thd, &where)) { DBUG_RETURN(TRUE); } /* check that it is not VIEW in which we insert with INSERT SELECT (in this case we can't add view WHERE condition to main SELECT_LEX) */ if (!no_where_clause && !where_processed) { TABLE_LIST *tbl= this; Query_arena *arena= thd->stmt_arena, backup; arena= thd->activate_stmt_arena_if_needed(&backup); // For easier test /* Go up to join tree and try to find left join */ for (; tbl; tbl= tbl->embedding) { if (tbl->outer_join) { /* Store WHERE condition to ON expression for outer join, because we can't use WHERE to correctly execute left joins on VIEWs and this expression will not be moved to WHERE condition (i.e. will be clean correctly for PS/SP) */ tbl->on_expr= and_conds(tbl->on_expr, where->copy_andor_structure(thd)); break; } } if (tbl == 0) *conds= and_conds(*conds, where->copy_andor_structure(thd)); if (arena) thd->restore_active_arena(arena, &backup); where_processed= TRUE; } } DBUG_RETURN(FALSE); } /* Prepare check option expression of table SYNOPSIS st_table_list::prep_check_option() thd - thread handler check_opt_type - WITH CHECK OPTION type (VIEW_CHECK_NONE, VIEW_CHECK_LOCAL, VIEW_CHECK_CASCADED) we use this parameter instead of direct check of effective_with_check to change type of underlying views to VIEW_CHECK_CASCADED if outer view have such option and prevent processing of underlying view check options if outer view have just VIEW_CHECK_LOCAL option. NOTE This method build check options for every call (usual execution or every SP/PS call) This method have to be called after WHERE preparation (st_table_list::prep_where) RETURN FALSE - OK TRUE - error */ bool st_table_list::prep_check_option(THD *thd, uint8 check_opt_type) { DBUG_ENTER("st_table_list::prep_check_option"); for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { /* see comment of check_opt_type parameter */ if (tbl->view && tbl->prep_check_option(thd, ((check_opt_type == VIEW_CHECK_CASCADED) ? VIEW_CHECK_CASCADED : VIEW_CHECK_NONE))) { DBUG_RETURN(TRUE); } } if (check_opt_type) { Item *item= 0; if (where) { DBUG_ASSERT(where->fixed); item= where->copy_andor_structure(thd); } if (check_opt_type == VIEW_CHECK_CASCADED) { for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { if (tbl->check_option) item= and_conds(item, tbl->check_option); } } if (item) thd->change_item_tree(&check_option, item); } if (check_option) { const char *save_where= thd->where; thd->where= "check option"; if (!check_option->fixed && check_option->fix_fields(thd, &check_option) || check_option->check_cols(1)) { DBUG_RETURN(TRUE); } thd->where= save_where; } DBUG_RETURN(FALSE); } /* Hide errors which show view underlying table information SYNOPSIS st_table_list::hide_view_error() thd thread handler */ void st_table_list::hide_view_error(THD *thd) { /* Hide "Unknown column" or "Unknown function" error */ if (thd->net.last_errno == ER_BAD_FIELD_ERROR || thd->net.last_errno == ER_SP_DOES_NOT_EXIST || thd->net.last_errno == ER_PROCACCESS_DENIED_ERROR || thd->net.last_errno == ER_COLUMNACCESS_DENIED_ERROR || thd->net.last_errno == ER_TABLEACCESS_DENIED_ERROR) { TABLE_LIST *top= top_table(); thd->clear_error(); my_error(ER_VIEW_INVALID, MYF(0), top->view_db.str, top->view_name.str); } else if (thd->net.last_errno == ER_NO_DEFAULT_FOR_FIELD) { TABLE_LIST *top= top_table(); thd->clear_error(); // TODO: make correct error message my_error(ER_NO_DEFAULT_FOR_VIEW_FIELD, MYF(0), top->view_db.str, top->view_name.str); } } /* Find underlying base tables (TABLE_LIST) which represent given table_to_find (TABLE) SYNOPSIS st_table_list::find_underlying_table() table_to_find table to find RETURN 0 table is not found found table reference */ st_table_list *st_table_list::find_underlying_table(TABLE *table_to_find) { /* is this real table and table which we are looking for? */ if (table == table_to_find && merge_underlying_list == 0) return this; for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { TABLE_LIST *result; if ((result= tbl->find_underlying_table(table_to_find))) return result; } return 0; } /* cleunup items belonged to view fields translation table SYNOPSIS st_table_list::cleanup_items() */ void st_table_list::cleanup_items() { if (!field_translation) return; for (Field_translator *transl= field_translation; transl < field_translation_end; transl++) transl->item->walk(&Item::cleanup_processor, 0, 0); } /* check CHECK OPTION condition SYNOPSIS check_option() ignore_failure ignore check option fail RETURN VIEW_CHECK_OK OK VIEW_CHECK_ERROR FAILED VIEW_CHECK_SKIP FAILED, but continue */ int st_table_list::view_check_option(THD *thd, bool ignore_failure) { if (check_option && check_option->val_int() == 0) { TABLE_LIST *main_view= top_table(); if (ignore_failure) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_VIEW_CHECK_FAILED, ER(ER_VIEW_CHECK_FAILED), main_view->view_db.str, main_view->view_name.str); return(VIEW_CHECK_SKIP); } my_error(ER_VIEW_CHECK_FAILED, MYF(0), main_view->view_db.str, main_view->view_name.str); return(VIEW_CHECK_ERROR); } return(VIEW_CHECK_OK); } /* Find table in underlying tables by mask and check that only this table belong to given mask SYNOPSIS st_table_list::check_single_table() table_arg reference on variable where to store found table (should be 0 on call, to find table, or point to table for unique test) map bit mask of tables view_arg view for which we are looking table RETURN FALSE table not found or found only one TRUE found several tables */ bool st_table_list::check_single_table(st_table_list **table_arg, table_map map, st_table_list *view_arg) { for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) { if (tbl->table) { if (tbl->table->map & map) { if (*table_arg) return TRUE; *table_arg= tbl; tbl->check_option= view_arg->check_option; } } else if (tbl->check_single_table(table_arg, map, view_arg)) return TRUE; } return FALSE; } /* Set insert_values buffer SYNOPSIS set_insert_values() mem_root memory pool for allocating RETURN FALSE - OK TRUE - out of memory */ bool st_table_list::set_insert_values(MEM_ROOT *mem_root) { if (table) { if (!table->insert_values && !(table->insert_values= (byte *)alloc_root(mem_root, table->s->rec_buff_length))) return TRUE; } else { DBUG_ASSERT(view && merge_underlying_list); for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) if (tbl->set_insert_values(mem_root)) return TRUE; } return FALSE; } /* Test if this is a leaf with respect to name resolution. SYNOPSIS st_table_list::is_leaf_for_name_resolution() DESCRIPTION A table reference is a leaf with respect to name resolution if it is either a leaf node in a nested join tree (table, view, schema table, subquery), or an inner node that represents a NATURAL/USING join, or a nested join with materialized join columns. RETURN TRUE if a leaf, FALSE otherwise. */ bool st_table_list::is_leaf_for_name_resolution() { return (view || is_natural_join || is_join_columns_complete || !nested_join); } /* Retrieve the first (left-most) leaf in a nested join tree with respect to name resolution. SYNOPSIS st_table_list::first_leaf_for_name_resolution() DESCRIPTION Given that 'this' is a nested table reference, recursively walk down the left-most children of 'this' until we reach a leaf table reference with respect to name resolution. IMPLEMENTATION The left-most child of a nested table reference is the last element in the list of children because the children are inserted in reverse order. RETURN If 'this' is a nested table reference - the left-most child of the tree rooted in 'this', else return 'this' */ TABLE_LIST *st_table_list::first_leaf_for_name_resolution() { TABLE_LIST *cur_table_ref; NESTED_JOIN *cur_nested_join; LINT_INIT(cur_table_ref); if (is_leaf_for_name_resolution()) return this; DBUG_ASSERT(nested_join); for (cur_nested_join= nested_join; cur_nested_join; cur_nested_join= cur_table_ref->nested_join) { List_iterator_fast it(cur_nested_join->join_list); cur_table_ref= it++; /* If the current nested join is a RIGHT JOIN, the operands in 'join_list' are in reverse order, thus the first operand is already at the front of the list. Otherwise the first operand is in the end of the list of join operands. */ if (!(cur_table_ref->outer_join & JOIN_TYPE_RIGHT)) { TABLE_LIST *next; while ((next= it++)) cur_table_ref= next; } if (cur_table_ref->is_leaf_for_name_resolution()) break; } return cur_table_ref; } /* Retrieve the last (right-most) leaf in a nested join tree with respect to name resolution. SYNOPSIS st_table_list::last_leaf_for_name_resolution() DESCRIPTION Given that 'this' is a nested table reference, recursively walk down the right-most children of 'this' until we reach a leaf table reference with respect to name resolution. IMPLEMENTATION The right-most child of a nested table reference is the first element in the list of children because the children are inserted in reverse order. RETURN - If 'this' is a nested table reference - the right-most child of the tree rooted in 'this', - else - 'this' */ TABLE_LIST *st_table_list::last_leaf_for_name_resolution() { TABLE_LIST *cur_table_ref= this; NESTED_JOIN *cur_nested_join; if (is_leaf_for_name_resolution()) return this; DBUG_ASSERT(nested_join); for (cur_nested_join= nested_join; cur_nested_join; cur_nested_join= cur_table_ref->nested_join) { cur_table_ref= cur_nested_join->join_list.head(); /* If the current nested is a RIGHT JOIN, the operands in 'join_list' are in reverse order, thus the last operand is in the end of the list. */ if ((cur_table_ref->outer_join & JOIN_TYPE_RIGHT)) { List_iterator_fast it(cur_nested_join->join_list); TABLE_LIST *next; cur_table_ref= it++; while ((next= it++)) cur_table_ref= next; } if (cur_table_ref->is_leaf_for_name_resolution()) break; } return cur_table_ref; } /* Register access mode which we need for underlying tables SYNOPSIS register_want_access() want_access Acess which we require */ void st_table_list::register_want_access(ulong want_access) { /* Remove SHOW_VIEW_ACL, because it will be checked during making view */ want_access&= ~SHOW_VIEW_ACL; if (belong_to_view) { grant.want_privilege= want_access; if (table) table->grant.want_privilege= want_access; } for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local) tbl->register_want_access(want_access); } /* Load security context information for this view SYNOPSIS st_table_list::prepare_view_securety_context() thd [in] thread handler RETURN FALSE OK TRUE Error */ #ifndef NO_EMBEDDED_ACCESS_CHECKS bool st_table_list::prepare_view_securety_context(THD *thd) { DBUG_ENTER("st_table_list::prepare_view_securety_context"); DBUG_PRINT("enter", ("table: %s", alias)); DBUG_ASSERT(!prelocking_placeholder && view); if (view_suid) { DBUG_PRINT("info", ("This table is suid view => load contest")); DBUG_ASSERT(view && view_sctx); if (acl_getroot_no_password(view_sctx, definer.user.str, definer.host.str, definer.host.str, thd->db)) { if (thd->lex->sql_command == SQLCOM_SHOW_CREATE) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_NO_SUCH_USER, ER(ER_NO_SUCH_USER), definer.user.str, definer.host.str); } else { if (thd->security_ctx->master_access & SUPER_ACL) { my_error(ER_NO_SUCH_USER, MYF(0), definer.user.str, definer.host.str); } else { my_error(ER_ACCESS_DENIED_ERROR, MYF(0), thd->security_ctx->priv_user, thd->security_ctx->priv_host, (thd->password ? ER(ER_YES) : ER(ER_NO))); } DBUG_RETURN(TRUE); } } } DBUG_RETURN(FALSE); } #endif /* Find security context of current view SYNOPSIS st_table_list::find_view_security_context() thd [in] thread handler */ #ifndef NO_EMBEDDED_ACCESS_CHECKS Security_context *st_table_list::find_view_security_context(THD *thd) { Security_context *sctx; TABLE_LIST *upper_view= this; DBUG_ENTER("st_table_list::find_view_security_context"); DBUG_ASSERT(view); while (upper_view && !upper_view->view_suid) { DBUG_ASSERT(!upper_view->prelocking_placeholder); upper_view= upper_view->referencing_view; } if (upper_view) { DBUG_PRINT("info", ("Securety context of view %s will be used", upper_view->alias)); sctx= upper_view->view_sctx; DBUG_ASSERT(sctx); } else { DBUG_PRINT("info", ("Current global context will be used")); sctx= thd->security_ctx; } DBUG_RETURN(sctx); } #endif /* Prepare security context and load underlying tables priveleges for view SYNOPSIS st_table_list::prepare_security() thd [in] thread handler RETURN FALSE OK TRUE Error */ bool st_table_list::prepare_security(THD *thd) { List_iterator_fast tb(*view_tables); TABLE_LIST *tbl; DBUG_ENTER("st_table_list::prepare_security"); #ifndef NO_EMBEDDED_ACCESS_CHECKS Security_context *save_security_ctx= thd->security_ctx; DBUG_ASSERT(!prelocking_placeholder); if (prepare_view_securety_context(thd)) DBUG_RETURN(TRUE); thd->security_ctx= find_view_security_context(thd); while ((tbl= tb++)) { DBUG_ASSERT(tbl->referencing_view); char *local_db, *local_table_name; if (tbl->view) { local_db= tbl->view_db.str; local_table_name= tbl->view_name.str; } else { local_db= tbl->db; local_table_name= tbl->table_name; } fill_effective_table_privileges(thd, &tbl->grant, local_db, local_table_name); if (tbl->table) tbl->table->grant= grant; } thd->security_ctx= save_security_ctx; #else while ((tbl= tb++)) tbl->grant.privilege= ~NO_ACCESS; #endif DBUG_RETURN(FALSE); } Natural_join_column::Natural_join_column(Field_translator *field_param, TABLE_LIST *tab) { DBUG_ASSERT(tab->field_translation); view_field= field_param; table_field= NULL; table_ref= tab; is_common= FALSE; } Natural_join_column::Natural_join_column(Field *field_param, TABLE_LIST *tab) { DBUG_ASSERT(tab->table == field_param->table); table_field= field_param; view_field= NULL; table_ref= tab; is_common= FALSE; } const char *Natural_join_column::name() { if (view_field) { DBUG_ASSERT(table_field == NULL); return view_field->name; } return table_field->field_name; } Item *Natural_join_column::create_item(THD *thd) { if (view_field) { DBUG_ASSERT(table_field == NULL); return create_view_field(thd, table_ref, &view_field->item, view_field->name); } return new Item_field(thd, &thd->lex->current_select->context, table_field); } Field *Natural_join_column::field() { if (view_field) { DBUG_ASSERT(table_field == NULL); return NULL; } return table_field; } const char *Natural_join_column::table_name() { DBUG_ASSERT(table_ref); return table_ref->alias; } const char *Natural_join_column::db_name() { if (view_field) return table_ref->view_db.str; /* Test that TABLE_LIST::db is the same as st_table_share::db to ensure consistency. An exception are I_S schema tables, which are inconsistent in this respect. */ DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str) || (table_ref->schema_table && table_ref->table->s->db.str[0] == 0)); return table_ref->db; } GRANT_INFO *Natural_join_column::grant() { if (view_field) return &(table_ref->grant); return &(table_ref->table->grant); } void Field_iterator_view::set(TABLE_LIST *table) { DBUG_ASSERT(table->field_translation); view= table; ptr= table->field_translation; array_end= table->field_translation_end; } const char *Field_iterator_table::name() { return (*ptr)->field_name; } Item *Field_iterator_table::create_item(THD *thd) { return new Item_field(thd, &thd->lex->current_select->context, *ptr); } const char *Field_iterator_view::name() { return ptr->name; } Item *Field_iterator_view::create_item(THD *thd) { return create_view_field(thd, view, &ptr->item, ptr->name); } Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref, const char *name) { bool save_wrapper= thd->lex->select_lex.no_wrap_view_item; Item *field= *field_ref; DBUG_ENTER("create_view_field"); if (view->schema_table_reformed) { /* Translation table items are always Item_fields and already fixed ('mysql_schema_table' function). So we can return directly the field. This case happens only for 'show & where' commands. */ DBUG_ASSERT(field && field->fixed); DBUG_RETURN(field); } DBUG_ASSERT(field); thd->lex->current_select->no_wrap_view_item= TRUE; if (!field->fixed) { if (field->fix_fields(thd, field_ref)) { thd->lex->current_select->no_wrap_view_item= save_wrapper; DBUG_RETURN(0); } field= *field_ref; } thd->lex->current_select->no_wrap_view_item= save_wrapper; if (save_wrapper) { DBUG_RETURN(field); } Item *item= new Item_direct_view_ref(&view->view->select_lex.context, field_ref, view->alias, name); DBUG_RETURN(item); } void Field_iterator_natural_join::set(TABLE_LIST *table_ref) { DBUG_ASSERT(table_ref->join_columns); column_ref_it.init(*(table_ref->join_columns)); cur_column_ref= column_ref_it++; } void Field_iterator_natural_join::next() { cur_column_ref= column_ref_it++; DBUG_ASSERT(!cur_column_ref || ! cur_column_ref->table_field || cur_column_ref->table_ref->table == cur_column_ref->table_field->table); } void Field_iterator_table_ref::set_field_iterator() { DBUG_ENTER("Field_iterator_table_ref::set_field_iterator"); /* If the table reference we are iterating over is a natural join, or it is an operand of a natural join, and TABLE_LIST::join_columns contains all the columns of the join operand, then we pick the columns from TABLE_LIST::join_columns, instead of the orginial container of the columns of the join operator. */ if (table_ref->is_join_columns_complete) { /* Necesary, but insufficient conditions. */ DBUG_ASSERT(table_ref->is_natural_join || table_ref->nested_join || table_ref->join_columns && /* This is a merge view. */ ((table_ref->field_translation && table_ref->join_columns->elements == (ulong)(table_ref->field_translation_end - table_ref->field_translation)) || /* This is stored table or a tmptable view. */ (!table_ref->field_translation && table_ref->join_columns->elements == table_ref->table->s->fields))); field_it= &natural_join_it; DBUG_PRINT("info",("field_it for '%s' is Field_iterator_natural_join", table_ref->alias)); } /* This is a merge view, so use field_translation. */ else if (table_ref->field_translation) { DBUG_ASSERT(table_ref->view && table_ref->effective_algorithm == VIEW_ALGORITHM_MERGE); field_it= &view_field_it; DBUG_PRINT("info", ("field_it for '%s' is Field_iterator_view", table_ref->alias)); } /* This is a base table or stored view. */ else { DBUG_ASSERT(table_ref->table || table_ref->view); field_it= &table_field_it; DBUG_PRINT("info", ("field_it for '%s' is Field_iterator_table", table_ref->alias)); } field_it->set(table_ref); DBUG_VOID_RETURN; } void Field_iterator_table_ref::set(TABLE_LIST *table) { DBUG_ASSERT(table); first_leaf= table->first_leaf_for_name_resolution(); last_leaf= table->last_leaf_for_name_resolution(); DBUG_ASSERT(first_leaf && last_leaf); table_ref= first_leaf; set_field_iterator(); } void Field_iterator_table_ref::next() { /* Move to the next field in the current table reference. */ field_it->next(); /* If all fields of the current table reference are exhausted, move to the next leaf table reference. */ if (field_it->end_of_fields() && table_ref != last_leaf) { table_ref= table_ref->next_name_resolution_table; DBUG_ASSERT(table_ref); set_field_iterator(); } } const char *Field_iterator_table_ref::table_name() { if (table_ref->view) return table_ref->view_name.str; else if (table_ref->is_natural_join) return natural_join_it.column_ref()->table_name(); DBUG_ASSERT(!strcmp(table_ref->table_name, table_ref->table->s->table_name.str)); return table_ref->table_name; } const char *Field_iterator_table_ref::db_name() { if (table_ref->view) return table_ref->view_db.str; else if (table_ref->is_natural_join) return natural_join_it.column_ref()->db_name(); /* Test that TABLE_LIST::db is the same as st_table_share::db to ensure consistency. An exception are I_S schema tables, which are inconsistent in this respect. */ DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str) || (table_ref->schema_table && table_ref->table->s->db.str[0] == 0)); return table_ref->db; } GRANT_INFO *Field_iterator_table_ref::grant() { if (table_ref->view) return &(table_ref->grant); else if (table_ref->is_natural_join) return natural_join_it.column_ref()->grant(); return &(table_ref->table->grant); } /* Create new or return existing column reference to a column of a natural/using join. SYNOPSIS Field_iterator_table_ref::get_or_create_column_ref() parent_table_ref the parent table reference over which the iterator is iterating DESCRIPTION Create a new natural join column for the current field of the iterator if no such column was created, or return an already created natural join column. The former happens for base tables or views, and the latter for natural/using joins. If a new field is created, then the field is added to 'parent_table_ref' if it is given, or to the original table referene of the field if parent_table_ref == NULL. NOTES This method is designed so that when a Field_iterator_table_ref walks through the fields of a table reference, all its fields are created and stored as follows: - If the table reference being iterated is a stored table, view or natural/using join, store all natural join columns in a list attached to that table reference. - If the table reference being iterated is a nested join that is not natural/using join, then do not materialize its result fields. This is OK because for such table references Field_iterator_table_ref iterates over the fields of the nested table references (recursively). In this way we avoid the storage of unnecessay copies of result columns of nested joins. RETURN # Pointer to a column of a natural join (or its operand) NULL No memory to allocate the column */ Natural_join_column * Field_iterator_table_ref::get_or_create_column_ref(TABLE_LIST *parent_table_ref) { Natural_join_column *nj_col; bool is_created= TRUE; uint field_count; TABLE_LIST *add_table_ref= parent_table_ref ? parent_table_ref : table_ref; LINT_INIT(field_count); if (field_it == &table_field_it) { /* The field belongs to a stored table. */ Field *tmp_field= table_field_it.field(); nj_col= new Natural_join_column(tmp_field, table_ref); field_count= table_ref->table->s->fields; } else if (field_it == &view_field_it) { /* The field belongs to a merge view or information schema table. */ Field_translator *translated_field= view_field_it.field_translator(); nj_col= new Natural_join_column(translated_field, table_ref); field_count= table_ref->field_translation_end - table_ref->field_translation; } else { /* The field belongs to a NATURAL join, therefore the column reference was already created via one of the two constructor calls above. In this case we just return the already created column reference. */ DBUG_ASSERT(table_ref->is_join_columns_complete); is_created= FALSE; nj_col= natural_join_it.column_ref(); DBUG_ASSERT(nj_col); } DBUG_ASSERT(!nj_col->table_field || nj_col->table_ref->table == nj_col->table_field->table); /* If the natural join column was just created add it to the list of natural join columns of either 'parent_table_ref' or to the table reference that directly contains the original field. */ if (is_created) { /* Make sure not all columns were materialized. */ DBUG_ASSERT(!add_table_ref->is_join_columns_complete); if (!add_table_ref->join_columns) { /* Create a list of natural join columns on demand. */ if (!(add_table_ref->join_columns= new List)) return NULL; add_table_ref->is_join_columns_complete= FALSE; } add_table_ref->join_columns->push_back(nj_col); /* If new fields are added to their original table reference, mark if all fields were added. We do it here as the caller has no easy way of knowing when to do it. If the fields are being added to parent_table_ref, then the caller must take care to mark when all fields are created/added. */ if (!parent_table_ref && add_table_ref->join_columns->elements == field_count) add_table_ref->is_join_columns_complete= TRUE; } return nj_col; } /* Return an existing reference to a column of a natural/using join. SYNOPSIS Field_iterator_table_ref::get_natural_column_ref() DESCRIPTION The method should be called in contexts where it is expected that all natural join columns are already created, and that the column being retrieved is a Natural_join_column. RETURN # Pointer to a column of a natural join (or its operand) NULL No memory to allocate the column */ Natural_join_column * Field_iterator_table_ref::get_natural_column_ref() { Natural_join_column *nj_col; DBUG_ASSERT(field_it == &natural_join_it); /* The field belongs to a NATURAL join, therefore the column reference was already created via one of the two constructor calls above. In this case we just return the already created column reference. */ nj_col= natural_join_it.column_ref(); DBUG_ASSERT(nj_col && (!nj_col->table_field || nj_col->table_ref->table == nj_col->table_field->table)); return nj_col; } /***************************************************************************** Functions to handle column usage bitmaps (read_set, write_set etc...) *****************************************************************************/ /* Reset all columns bitmaps */ void st_table::clear_column_bitmaps() { /* Reset column read/write usage. It's identical to: bitmap_clear_all(&table->def_read_set); bitmap_clear_all(&table->def_write_set); */ bzero((char*) def_read_set.bitmap, s->column_bitmap_size*2); column_bitmaps_set(&def_read_set, &def_write_set); } /* Tell handler we are going to call position() and rnd_pos() later. NOTES: This is needed for handlers that uses the primary key to find the row. In this case we have to extend the read bitmap with the primary key fields. */ void st_table::prepare_for_position() { DBUG_ENTER("st_table::prepare_for_position"); if ((file->ha_table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) && s->primary_key < MAX_KEY) { mark_columns_used_by_index_no_reset(s->primary_key, read_set); /* signal change */ file->column_bitmaps_signal(); } DBUG_VOID_RETURN; } /* Mark that only fields from one key is used NOTE: This changes the bitmap to use the tmp bitmap After this, you can't access any other columns in the table until bitmaps are reset, for example with st_table::clear_column_bitmaps() or st_table::restore_column_maps_after_mark_index() */ void st_table::mark_columns_used_by_index(uint index) { MY_BITMAP *bitmap= &tmp_set; DBUG_ENTER("st_table::mark_columns_used_by_index"); (void) file->extra(HA_EXTRA_KEYREAD); bitmap_clear_all(bitmap); mark_columns_used_by_index_no_reset(index, bitmap); column_bitmaps_set(bitmap, bitmap); DBUG_VOID_RETURN; } /* Restore to use normal column maps after key read NOTES This reverse the change done by mark_columns_used_by_index WARNING For this to work, one must have the normal table maps in place when calling mark_columns_used_by_index */ void st_table::restore_column_maps_after_mark_index() { DBUG_ENTER("st_table::restore_column_maps_after_mark_index"); key_read= 0; (void) file->extra(HA_EXTRA_NO_KEYREAD); default_column_bitmaps(); file->column_bitmaps_signal(); DBUG_VOID_RETURN; } /* mark columns used by key, but don't reset other fields */ void st_table::mark_columns_used_by_index_no_reset(uint index, MY_BITMAP *bitmap) { KEY_PART_INFO *key_part= key_info[index].key_part; KEY_PART_INFO *key_part_end= (key_part + key_info[index].key_parts); for (;key_part != key_part_end; key_part++) bitmap_set_bit(bitmap, key_part->fieldnr-1); } /* Mark auto-increment fields as used fields in both read and write maps NOTES This is needed in insert & update as the auto-increment field is always set and sometimes read. */ void st_table::mark_auto_increment_column() { DBUG_ASSERT(found_next_number_field); /* We must set bit in read set as update_auto_increment() is using the store() to check overflow of auto_increment values */ bitmap_set_bit(read_set, found_next_number_field->field_index); bitmap_set_bit(write_set, found_next_number_field->field_index); if (s->next_number_key_offset) mark_columns_used_by_index_no_reset(s->next_number_index, read_set); file->column_bitmaps_signal(); } /* Mark columns needed for doing an delete of a row DESCRIPTON Some table engines don't have a cursor on the retrieve rows so they need either to use the primary key or all columns to be able to delete a row. If the engine needs this, the function works as follows: - If primary key exits, mark the primary key columns to be read. - If not, mark all columns to be read If the engine has HA_REQUIRES_KEY_COLUMNS_FOR_DELETE, we will mark all key columns as 'to-be-read'. This allows the engine to loop over the given record to find all keys and doesn't have to retrieve the row again. */ void st_table::mark_columns_needed_for_delete() { if (triggers) triggers->mark_fields_used(TRG_EVENT_DELETE); if (file->ha_table_flags() & HA_REQUIRES_KEY_COLUMNS_FOR_DELETE) { Field **reg_field; for (reg_field= field ; *reg_field ; reg_field++) { if ((*reg_field)->flags & PART_KEY_FLAG) bitmap_set_bit(read_set, (*reg_field)->field_index); } file->column_bitmaps_signal(); } if (file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) { /* If the handler has no cursor capabilites, we have to read either the primary key, the hidden primary key or all columns to be able to do an delete */ if (s->primary_key == MAX_KEY) file->use_hidden_primary_key(); else { mark_columns_used_by_index_no_reset(s->primary_key, read_set); file->column_bitmaps_signal(); } } } /* Mark columns needed for doing an update of a row DESCRIPTON Some engines needs to have all columns in an update (to be able to build a complete row). If this is the case, we mark all not updated columns to be read. If this is no the case, we do like in the delete case and mark if neeed, either the primary key column or all columns to be read. (see mark_columns_needed_for_delete() for details) If the engine has HA_REQUIRES_KEY_COLUMNS_FOR_DELETE, we will mark all USED key columns as 'to-be-read'. This allows the engine to loop over the given record to find all changed keys and doesn't have to retrieve the row again. */ void st_table::mark_columns_needed_for_update() { DBUG_ENTER("mark_columns_needed_for_update"); if (triggers) triggers->mark_fields_used(TRG_EVENT_UPDATE); if (file->ha_table_flags() & HA_REQUIRES_KEY_COLUMNS_FOR_DELETE) { /* Mark all used key columns for read */ Field **reg_field; for (reg_field= field ; *reg_field ; reg_field++) { /* Merge keys is all keys that had a column refered to in the query */ if (merge_keys.is_overlapping((*reg_field)->part_of_key)) bitmap_set_bit(read_set, (*reg_field)->field_index); } file->column_bitmaps_signal(); } if (file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) { /* If the handler has no cursor capabilites, we have to read either the primary key, the hidden primary key or all columns to be able to do an update */ if (s->primary_key == MAX_KEY) file->use_hidden_primary_key(); else { mark_columns_used_by_index_no_reset(s->primary_key, read_set); file->column_bitmaps_signal(); } } DBUG_VOID_RETURN; } /* Mark columns the handler needs for doing an insert For now, this is used to mark fields used by the trigger as changed. */ void st_table::mark_columns_needed_for_insert() { if (triggers) { /* We don't need to mark columns which are used by ON DELETE and ON UPDATE triggers, which may be invoked in case of REPLACE or INSERT ... ON DUPLICATE KEY UPDATE, since before doing actual row replacement or update write_record() will mark all table fields as used. */ triggers->mark_fields_used(TRG_EVENT_INSERT); } if (found_next_number_field) mark_auto_increment_column(); } /* Cleanup this table for re-execution. SYNOPSIS st_table_list::reinit_before_use() */ void st_table_list::reinit_before_use(THD *thd) { /* Reset old pointers to TABLEs: they are not valid since the tables were closed in the end of previous prepare or execute call. */ table= 0; /* Reset is_schema_table_processed value(needed for I_S tables */ schema_table_state= NOT_PROCESSED; TABLE_LIST *embedded; /* The table at the current level of nesting. */ TABLE_LIST *parent_embedding= this; /* The parent nested table reference. */ do { embedded= parent_embedding; if (embedded->prep_on_expr) embedded->on_expr= embedded->prep_on_expr->copy_andor_structure(thd); parent_embedding= embedded->embedding; } while (parent_embedding && parent_embedding->nested_join->join_list.head() == embedded); } /* Return subselect that contains the FROM list this table is taken from SYNOPSIS st_table_list::containing_subselect() RETURN Subselect item for the subquery that contains the FROM list this table is taken from if there is any 0 - otherwise */ Item_subselect *st_table_list::containing_subselect() { return (select_lex ? select_lex->master_unit()->item : 0); } /***************************************************************************** ** Instansiate templates *****************************************************************************/ #ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION template class List; template class List_iterator; #endif