/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or (at your option) any later version. 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 */ /***************************************************************************** ** ** This file implements classes defined in sql_class.h ** Especially the classes to handle a result from a select ** *****************************************************************************/ #ifdef __GNUC__ #pragma implementation // gcc: Class implementation #endif #include "mysql_priv.h" #include "sql_acl.h" #include #include #include #ifdef __WIN__ #include #endif #include /* The following is used to initialise Table_ident with a internal table name */ char internal_table_name[2]= "*"; /***************************************************************************** ** Instansiate templates *****************************************************************************/ #ifdef __GNUC__ /* Used templates */ template class List; template class List_iterator; template class List; template class List_iterator; template class List; template class List_iterator; template class List; template class List_iterator; #endif /**************************************************************************** ** User variables ****************************************************************************/ extern "C" byte *get_var_key(user_var_entry *entry, uint *length, my_bool not_used __attribute__((unused))) { *length=(uint) entry->name.length; return (byte*) entry->name.str; } extern "C" void free_user_var(user_var_entry *entry) { char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry)); if (entry->value && entry->value != pos) my_free(entry->value, MYF(0)); my_free((char*) entry,MYF(0)); } bool key_part_spec::operator==(const key_part_spec& other) const { return length == other.length && !strcmp(field_name, other.field_name); } /* Test if a foreign key (= generated key) is a prefix of the given key (ignoring key name, key type and order of columns) NOTES: This is only used to test if an index for a FOREIGN KEY exists IMPLEMENTATION We only compare field names RETURN 0 Generated key is a prefix of other key 1 Not equal */ bool foreign_key_prefix(Key *a, Key *b) { /* Ensure that 'a' is the generated key */ if (a->generated) { if (b->generated && a->columns.elements > b->columns.elements) swap(Key*, a, b); // Put shorter key in 'a' } else { if (!b->generated) return TRUE; // No foreign key swap(Key*, a, b); // Put generated key in 'a' } /* Test if 'a' is a prefix of 'b' */ if (a->columns.elements > b->columns.elements) return TRUE; // Can't be prefix List_iterator col_it1(a->columns); List_iterator col_it2(b->columns); const key_part_spec *col1, *col2; #ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS while ((col1= col_it1++)) { bool found= 0; col_it2.rewind(); while ((col2= col_it2++)) { if (*col1 == *col2) { found= TRUE; break; } } if (!found) return TRUE; // Error } return FALSE; // Is prefix #else while ((col1= col_it1++)) { col2= col_it2++; if (!(*col1 == *col2)) return TRUE; } return FALSE; // Is prefix #endif } /**************************************************************************** ** Thread specific functions ****************************************************************************/ THD::THD():user_time(0), current_statement(0), is_fatal_error(0), last_insert_id_used(0), insert_id_used(0), rand_used(0), in_lock_tables(0), global_read_lock(0), bootstrap(0) { host= user= priv_user= db= ip=0; host_or_ip= "connecting host"; locked=killed=some_tables_deleted=no_errors=password= 0; query_start_used= 0; count_cuted_fields= CHECK_FIELD_IGNORE; db_length= col_access= 0; query_error= tmp_table_used= 0; next_insert_id=last_insert_id=0; open_tables= temporary_tables= handler_tables= derived_tables= 0; tmp_table=0; lock=locked_tables=0; used_tables=0; cuted_fields= sent_row_count= 0L; statement_id_counter= 0UL; // Must be reset to handle error with THD's created for init of mysqld lex->current_select= 0; start_time=(time_t) 0; current_linfo = 0; slave_thread = 0; variables.pseudo_thread_id= 0; file_id = 0; warn_id= 0; db_charset= global_system_variables.collation_database; mysys_var=0; #ifndef DBUG_OFF dbug_sentry=THD_SENTRY_MAGIC; #endif #ifndef EMBEDDED_LIBRARY net.vio=0; #endif net.last_error[0]=0; // If error on boot ull=0; system_thread=cleanup_done=0; peer_port= 0; // For SHOW PROCESSLIST transaction.changed_tables = 0; #ifdef __WIN__ real_id = 0; #endif #ifdef SIGNAL_WITH_VIO_CLOSE active_vio = 0; #endif pthread_mutex_init(&LOCK_delete, MY_MUTEX_INIT_FAST); /* Variables with default values */ proc_info="login"; where="field list"; server_id = ::server_id; slave_net = 0; command=COM_CONNECT; #ifndef NO_EMBEDDED_ACCESS_CHECKS db_access=NO_ACCESS; #endif version=refresh_version; // For boot *scramble= '\0'; init(); /* Initialize sub structures */ clear_alloc_root(&transaction.mem_root); init_alloc_root(&warn_root, WARN_ALLOC_BLOCK_SIZE, WARN_ALLOC_PREALLOC_SIZE); user_connect=(USER_CONN *)0; hash_init(&user_vars, &my_charset_bin, USER_VARS_HASH_SIZE, 0, 0, (hash_get_key) get_var_key, (hash_free_key) free_user_var,0); /* For user vars replication*/ if (opt_bin_log) my_init_dynamic_array(&user_var_events, sizeof(BINLOG_USER_VAR_EVENT *), 16, 16); else bzero((char*) &user_var_events, sizeof(user_var_events)); /* Protocol */ protocol= &protocol_simple; // Default protocol protocol_simple.init(this); protocol_prep.init(this); tablespace_op=FALSE; #ifdef USING_TRANSACTIONS bzero((char*) &transaction,sizeof(transaction)); /* Binlog is always open (if needed) before a THD is created (including bootstrap). */ if (opt_using_transactions && mysql_bin_log.is_open()) { if (open_cached_file(&transaction.trans_log, mysql_tmpdir, LOG_PREFIX, binlog_cache_size, MYF(MY_WME))) killed=1; transaction.trans_log.end_of_file= max_binlog_cache_size; } #endif { ulong tmp=sql_rnd_with_mutex(); randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::query_id); } } /* Init common variables that has to be reset on start and on change_user */ void THD::init(void) { pthread_mutex_lock(&LOCK_global_system_variables); variables= global_system_variables; variables.time_format= date_time_format_copy((THD*) 0, variables.time_format); variables.date_format= date_time_format_copy((THD*) 0, variables.date_format); variables.datetime_format= date_time_format_copy((THD*) 0, variables.datetime_format); pthread_mutex_unlock(&LOCK_global_system_variables); server_status= SERVER_STATUS_AUTOCOMMIT; options= thd_startup_options; open_options=ha_open_options; update_lock_default= (variables.low_priority_updates ? TL_WRITE_LOW_PRIORITY : TL_WRITE); session_tx_isolation= (enum_tx_isolation) variables.tx_isolation; warn_list.empty(); bzero((char*) warn_count, sizeof(warn_count)); total_warn_count= 0; update_charset(); } /* Init THD for query processing. This has to be called once before we call mysql_parse. See also comments in sql_class.h. */ void THD::init_for_queries() { init_sql_alloc(&mem_root, variables.query_alloc_block_size, variables.query_prealloc_size); init_sql_alloc(&transaction.mem_root, variables.trans_alloc_block_size, variables.trans_prealloc_size); } /* Do what's needed when one invokes change user SYNOPSIS change_user() IMPLEMENTATION Reset all resources that are connection specific */ void THD::change_user(void) { cleanup(); cleanup_done= 0; init(); hash_init(&user_vars, &my_charset_bin, USER_VARS_HASH_SIZE, 0, 0, (hash_get_key) get_var_key, (hash_free_key) free_user_var, 0); } /* Do operations that may take a long time */ void THD::cleanup(void) { DBUG_ENTER("THD::cleanup"); ha_rollback(this); if (locked_tables) { lock=locked_tables; locked_tables=0; close_thread_tables(this); } if (handler_tables) { open_tables=handler_tables; handler_tables=0; close_thread_tables(this); } close_temporary_tables(this); my_free((char*) variables.time_format, MYF(MY_ALLOW_ZERO_PTR)); my_free((char*) variables.date_format, MYF(MY_ALLOW_ZERO_PTR)); my_free((char*) variables.datetime_format, MYF(MY_ALLOW_ZERO_PTR)); delete_dynamic(&user_var_events); hash_free(&user_vars); if (global_read_lock) unlock_global_read_lock(this); if (ull) { pthread_mutex_lock(&LOCK_user_locks); item_user_lock_release(ull); pthread_mutex_unlock(&LOCK_user_locks); ull= 0; } cleanup_done=1; DBUG_VOID_RETURN; } THD::~THD() { THD_CHECK_SENTRY(this); DBUG_ENTER("~THD()"); /* Ensure that no one is using THD */ pthread_mutex_lock(&LOCK_delete); pthread_mutex_unlock(&LOCK_delete); /* Close connection */ #ifndef EMBEDDED_LIBRARY if (net.vio) { vio_delete(net.vio); net_end(&net); } #endif if (!cleanup_done) cleanup(); #ifdef USING_TRANSACTIONS if (opt_using_transactions) { close_cached_file(&transaction.trans_log); ha_close_connection(this); } #endif DBUG_PRINT("info", ("freeing host")); if (host != my_localhost) // If not pointer to constant safeFree(host); if (user != delayed_user) safeFree(user); safeFree(ip); safeFree(db); free_root(&warn_root,MYF(0)); free_root(&transaction.mem_root,MYF(0)); mysys_var=0; // Safety (shouldn't be needed) pthread_mutex_destroy(&LOCK_delete); #ifndef DBUG_OFF dbug_sentry = THD_SENTRY_GONE; #endif /* Reset stmt_backup.mem_root to not double-free memory from thd.mem_root */ clear_alloc_root(&stmt_backup.mem_root); DBUG_VOID_RETURN; } void THD::awake(bool prepare_to_die) { THD_CHECK_SENTRY(this); safe_mutex_assert_owner(&LOCK_delete); if (prepare_to_die) killed = 1; thr_alarm_kill(real_id); #ifdef SIGNAL_WITH_VIO_CLOSE close_active_vio(); #endif if (mysys_var) { pthread_mutex_lock(&mysys_var->mutex); if (!system_thread) // Don't abort locks mysys_var->abort=1; /* This broadcast could be up in the air if the victim thread exits the cond in the time between read and broadcast, but that is ok since all we want to do is to make the victim thread get out of waiting on current_cond. */ if (mysys_var->current_cond) { pthread_mutex_lock(mysys_var->current_mutex); pthread_cond_broadcast(mysys_var->current_cond); pthread_mutex_unlock(mysys_var->current_mutex); } pthread_mutex_unlock(&mysys_var->mutex); } } /* Remember the location of thread info, the structure needed for sql_alloc() and the structure for the net buffer */ bool THD::store_globals() { if (my_pthread_setspecific_ptr(THR_THD, this) || my_pthread_setspecific_ptr(THR_MALLOC, &mem_root)) return 1; mysys_var=my_thread_var; dbug_thread_id=my_thread_id(); /* By default 'slave_proxy_id' is 'thread_id'. They may later become different if this is the slave SQL thread. */ variables.pseudo_thread_id= thread_id; return 0; } /* Convert a string to another character set SYNOPSIS convert_string() to Store new allocated string here to_cs New character set for allocated string from String to convert from_length Length of string to convert from_cs Original character set NOTES to will be 0-terminated to make it easy to pass to system funcs RETURN 0 ok 1 End of memory. In this case to->str will point to 0 and to->length will be 0. */ bool THD::convert_string(LEX_STRING *to, CHARSET_INFO *to_cs, const char *from, uint from_length, CHARSET_INFO *from_cs) { DBUG_ENTER("convert_string"); size_s new_length= to_cs->mbmaxlen * from_length; if (!(to->str= alloc(new_length+1))) { to->length= 0; // Safety fix DBUG_RETURN(1); // EOM } to->length= copy_and_convert((char*) to->str, new_length, to_cs, from, from_length, from_cs); to->str[to->length]=0; // Safety DBUG_RETURN(0); } /* Update some cache variables when character set changes */ void THD::update_charset() { charset_is_system_charset= my_charset_same(charset(),system_charset_info); charset_is_collation_connection= my_charset_same(charset(), variables. collation_connection); } /* routings to adding tables to list of changed in transaction tables */ inline static void list_include(CHANGED_TABLE_LIST** prev, CHANGED_TABLE_LIST* curr, CHANGED_TABLE_LIST* new_table) { if (new_table) { *prev = new_table; (*prev)->next = curr; } } /* add table to list of changed in transaction tables */ void THD::add_changed_table(TABLE *table) { DBUG_ENTER("THD::add_changed_table(table)"); DBUG_ASSERT((options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) && table->file->has_transactions()); add_changed_table(table->table_cache_key, table->key_length); DBUG_VOID_RETURN; } void THD::add_changed_table(const char *key, long key_length) { DBUG_ENTER("THD::add_changed_table(key)"); CHANGED_TABLE_LIST **prev_changed = &transaction.changed_tables; CHANGED_TABLE_LIST *curr = transaction.changed_tables; for (; curr; prev_changed = &(curr->next), curr = curr->next) { int cmp = (long)curr->key_length - (long)key_length; if (cmp < 0) { list_include(prev_changed, curr, changed_table_dup(key, key_length)); DBUG_PRINT("info", ("key_length %u %u", key_length, (*prev_changed)->key_length)); DBUG_VOID_RETURN; } else if (cmp == 0) { cmp = memcmp(curr->key, key, curr->key_length); if (cmp < 0) { list_include(prev_changed, curr, changed_table_dup(key, key_length)); DBUG_PRINT("info", ("key_length %u %u", key_length, (*prev_changed)->key_length)); DBUG_VOID_RETURN; } else if (cmp == 0) { DBUG_PRINT("info", ("already in list")); DBUG_VOID_RETURN; } } } *prev_changed = changed_table_dup(key, key_length); DBUG_PRINT("info", ("key_length %u %u", key_length, (*prev_changed)->key_length)); DBUG_VOID_RETURN; } CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length) { CHANGED_TABLE_LIST* new_table = (CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+ key_length + 1); if (!new_table) { my_error(EE_OUTOFMEMORY, MYF(ME_BELL), ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1); killed= 1; return 0; } new_table->key = (char *) (((byte*)new_table)+ ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))); new_table->next = 0; new_table->key_length = key_length; ::memcpy(new_table->key, key, key_length); return new_table; } int THD::send_explain_fields(select_result *result) { List field_list; Item *item; field_list.push_back(new Item_return_int("id",3, MYSQL_TYPE_LONGLONG)); field_list.push_back(new Item_empty_string("select_type",19)); field_list.push_back(new Item_empty_string("table",NAME_LEN)); field_list.push_back(new Item_empty_string("type",10)); field_list.push_back(item=new Item_empty_string("possible_keys", NAME_LEN*MAX_KEY)); item->maybe_null=1; field_list.push_back(item=new Item_empty_string("key",NAME_LEN)); item->maybe_null=1; field_list.push_back(item=new Item_return_int("key_len",3, MYSQL_TYPE_LONGLONG)); item->maybe_null=1; field_list.push_back(item=new Item_empty_string("ref", NAME_LEN*MAX_REF_PARTS)); item->maybe_null=1; field_list.push_back(new Item_return_int("rows",10, MYSQL_TYPE_LONGLONG)); field_list.push_back(new Item_empty_string("Extra",255)); return (result->send_fields(field_list,1)); } #ifdef SIGNAL_WITH_VIO_CLOSE void THD::close_active_vio() { DBUG_ENTER("close_active_vio"); safe_mutex_assert_owner(&LOCK_delete); #ifndef EMBEDDED_LIBRARY if (active_vio) { vio_close(active_vio); active_vio = 0; } #endif DBUG_VOID_RETURN; } #endif /***************************************************************************** ** Functions to provide a interface to select results *****************************************************************************/ select_result::select_result() { thd=current_thd; } void select_result::send_error(uint errcode,const char *err) { ::send_error(thd, errcode, err); } static String default_line_term("\n",default_charset_info); static String default_escaped("\\",default_charset_info); static String default_field_term("\t",default_charset_info); sql_exchange::sql_exchange(char *name,bool flag) :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0) { field_term= &default_field_term; enclosed= line_start= &my_empty_string; line_term= &default_line_term; escaped= &default_escaped; } bool select_send::send_fields(List &list,uint flag) { return thd->protocol->send_fields(&list,flag); } /* Send data to client. Returns 0 if ok */ bool select_send::send_data(List &items) { if (unit->offset_limit_cnt) { // using limit offset,count unit->offset_limit_cnt--; return 0; } #ifdef HAVE_INNOBASE_DB /* We may be passing the control from mysqld to the client: release the InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved by thd */ if (thd->transaction.all.innobase_tid) ha_release_temporary_latches(thd); #endif List_iterator_fast li(items); Protocol *protocol= thd->protocol; char buff[MAX_FIELD_WIDTH]; String buffer(buff, sizeof(buff), &my_charset_bin); DBUG_ENTER("send_data"); protocol->prepare_for_resend(); Item *item; while ((item=li++)) { if (item->send(protocol, &buffer)) { protocol->free(); // Free used buffer my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0)); break; } } thd->sent_row_count++; if (!thd->net.vio) DBUG_RETURN(0); if (!thd->net.report_error) DBUG_RETURN(protocol->write()); DBUG_RETURN(1); } bool select_send::send_eof() { #ifdef HAVE_INNOBASE_DB /* We may be passing the control from mysqld to the client: release the InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved by thd */ if (thd->transaction.all.innobase_tid) ha_release_temporary_latches(thd); #endif /* Unlock tables before sending packet to gain some speed */ if (thd->lock) { mysql_unlock_tables(thd, thd->lock); thd->lock=0; } if (!thd->net.report_error) { ::send_eof(thd); return 0; } else return 1; } /************************************************************************ Handling writing to file ************************************************************************/ void select_to_file::send_error(uint errcode,const char *err) { ::send_error(thd,errcode,err); if (file > 0) { (void) end_io_cache(&cache); (void) my_close(file,MYF(0)); (void) my_delete(path,MYF(0)); // Delete file on error file= -1; } } select_to_file::~select_to_file() { if (file >= 0) { // This only happens in case of error (void) end_io_cache(&cache); (void) my_close(file,MYF(0)); file= -1; } } /*************************************************************************** ** Export of select to textfile ***************************************************************************/ select_export::~select_export() { thd->sent_row_count=row_count; } /* Create file with IO cache SYNOPSIS create_file() thd Thread handle path File name exchange Excange class cache IO cache RETURN >= 0 File handle -1 Error */ static File create_file(THD *thd, char *path, sql_exchange *exchange, IO_CACHE *cache) { File file; uint option= MY_UNPACK_FILENAME; #ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS option|= MY_REPLACE_DIR; // Force use of db directory #endif (void) fn_format(path, exchange->file_name, thd->db ? thd->db : "", "", option); if (!access(path, F_OK)) { my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name); return -1; } /* Create the file world readable */ if ((file= my_create(path, 0666, O_WRONLY, MYF(MY_WME))) < 0) return file; #ifdef HAVE_FCHMOD (void) fchmod(file, 0666); // Because of umask() #else (void) chmod(path, 0666); #endif if (init_io_cache(cache, file, 0L, WRITE_CACHE, 0L, 1, MYF(MY_WME))) { my_close(file, MYF(0)); my_delete(path, MYF(0)); // Delete file on error, it was just created return -1; } return file; } int select_export::prepare(List &list, SELECT_LEX_UNIT *u) { bool blob_flag=0; unit= u; if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN) strmake(path,exchange->file_name,FN_REFLEN-1); if ((file= create_file(thd, path, exchange, &cache)) < 0) return 1; /* Check if there is any blobs in data */ { List_iterator_fast li(list); Item *item; while ((item=li++)) { if (item->max_length >= MAX_BLOB_WIDTH) { blob_flag=1; break; } } } field_term_length=exchange->field_term->length(); if (!exchange->line_term->length()) exchange->line_term=exchange->field_term; // Use this if it exists field_sep_char= (exchange->enclosed->length() ? (*exchange->enclosed)[0] : field_term_length ? (*exchange->field_term)[0] : INT_MAX); escape_char= (exchange->escaped->length() ? (*exchange->escaped)[0] : -1); line_sep_char= (exchange->line_term->length() ? (*exchange->line_term)[0] : INT_MAX); if (!field_term_length) exchange->opt_enclosed=0; if (!exchange->enclosed->length()) exchange->opt_enclosed=1; // A little quicker loop fixed_row_size= (!field_term_length && !exchange->enclosed->length() && !blob_flag); return 0; } bool select_export::send_data(List &items) { DBUG_ENTER("send_data"); char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH]; bool space_inited=0; String tmp(buff,sizeof(buff),&my_charset_bin),*res; tmp.length(0); if (unit->offset_limit_cnt) { // using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } row_count++; Item *item; char *buff_ptr=buff; uint used_length=0,items_left=items.elements; List_iterator_fast li(items); if (my_b_write(&cache,(byte*) exchange->line_start->ptr(), exchange->line_start->length())) goto err; while ((item=li++)) { Item_result result_type=item->result_type(); res=item->str_result(&tmp); if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT)) { if (my_b_write(&cache,(byte*) exchange->enclosed->ptr(), exchange->enclosed->length())) goto err; } if (!res) { // NULL if (!fixed_row_size) { if (escape_char != -1) // Use \N syntax { null_buff[0]=escape_char; null_buff[1]='N'; if (my_b_write(&cache,(byte*) null_buff,2)) goto err; } else if (my_b_write(&cache,(byte*) "NULL",4)) goto err; } else { used_length=0; // Fill with space } } else { if (fixed_row_size) used_length=min(res->length(),item->max_length); else used_length=res->length(); if (result_type == STRING_RESULT && escape_char != -1) { char *pos,*start,*end; for (start=pos=(char*) res->ptr(),end=pos+used_length ; pos != end ; pos++) { #ifdef USE_MB CHARSET_INFO *res_charset=res->charset(); if (use_mb(res_charset)) { int l; if ((l=my_ismbchar(res_charset, pos, end))) { pos += l-1; continue; } } #endif if ((int) *pos == escape_char || (int) *pos == field_sep_char || (int) *pos == line_sep_char || !*pos) { char tmp_buff[2]; tmp_buff[0]= escape_char; tmp_buff[1]= *pos ? *pos : '0'; if (my_b_write(&cache,(byte*) start,(uint) (pos-start)) || my_b_write(&cache,(byte*) tmp_buff,2)) goto err; start=pos+1; } } if (my_b_write(&cache,(byte*) start,(uint) (pos-start))) goto err; } else if (my_b_write(&cache,(byte*) res->ptr(),used_length)) goto err; } if (fixed_row_size) { // Fill with space if (item->max_length > used_length) { /* QQ: Fix by adding a my_b_fill() function */ if (!space_inited) { space_inited=1; bfill(space,sizeof(space),' '); } uint length=item->max_length-used_length; for (; length > sizeof(space) ; length-=sizeof(space)) { if (my_b_write(&cache,(byte*) space,sizeof(space))) goto err; } if (my_b_write(&cache,(byte*) space,length)) goto err; } } buff_ptr=buff; // Place separators here if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT)) { memcpy(buff_ptr,exchange->enclosed->ptr(),exchange->enclosed->length()); buff_ptr+=exchange->enclosed->length(); } if (--items_left) { memcpy(buff_ptr,exchange->field_term->ptr(),field_term_length); buff_ptr+=field_term_length; } if (my_b_write(&cache,(byte*) buff,(uint) (buff_ptr-buff))) goto err; } if (my_b_write(&cache,(byte*) exchange->line_term->ptr(), exchange->line_term->length())) goto err; DBUG_RETURN(0); err: DBUG_RETURN(1); } bool select_export::send_eof() { int error=test(end_io_cache(&cache)); if (my_close(file,MYF(MY_WME))) error=1; if (!error) ::send_ok(thd,row_count); file= -1; return error; } /*************************************************************************** ** Dump of select to a binary file ***************************************************************************/ int select_dump::prepare(List &list __attribute__((unused)), SELECT_LEX_UNIT *u) { unit= u; return (int) ((file= create_file(thd, path, exchange, &cache)) < 0); } bool select_dump::send_data(List &items) { List_iterator_fast li(items); char buff[MAX_FIELD_WIDTH]; String tmp(buff,sizeof(buff),&my_charset_bin),*res; tmp.length(0); Item *item; DBUG_ENTER("send_data"); if (unit->offset_limit_cnt) { // using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } if (row_count++ > 1) { my_error(ER_TOO_MANY_ROWS, MYF(0)); goto err; } while ((item=li++)) { res=item->str_result(&tmp); if (!res) // If NULL { if (my_b_write(&cache,(byte*) "",1)) goto err; } else if (my_b_write(&cache,(byte*) res->ptr(),res->length())) { my_error(ER_ERROR_ON_WRITE,MYF(0), path, my_errno); goto err; } } DBUG_RETURN(0); err: DBUG_RETURN(1); } bool select_dump::send_eof() { int error=test(end_io_cache(&cache)); if (my_close(file,MYF(MY_WME))) error=1; if (!error) ::send_ok(thd,row_count); file= -1; return error; } select_subselect::select_subselect(Item_subselect *item_arg) { item= item_arg; } bool select_singlerow_subselect::send_data(List &items) { DBUG_ENTER("select_singlerow_subselect::send_data"); Item_singlerow_subselect *it= (Item_singlerow_subselect *)item; if (it->assigned()) { my_message(ER_SUBQUERY_NO_1_ROW, ER(ER_SUBQUERY_NO_1_ROW), MYF(0)); DBUG_RETURN(1); } if (unit->offset_limit_cnt) { // Using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } List_iterator_fast li(items); Item *val_item; for (uint i= 0; (val_item= li++); i++) it->store(i, val_item); it->assigned(1); DBUG_RETURN(0); } bool select_max_min_finder_subselect::send_data(List &items) { DBUG_ENTER("select_max_min_finder_subselect::send_data"); Item_singlerow_subselect *it= (Item_singlerow_subselect *)item; List_iterator_fast li(items); Item *val_item= li++; if (it->assigned()) { cache->store(val_item); if ((this->*op)()) it->store(0, cache); } else { if (!cache) { cache= Item_cache::get_cache(val_item->result_type()); switch (val_item->result_type()) { case REAL_RESULT: op= &select_max_min_finder_subselect::cmp_real; break; case INT_RESULT: op= &select_max_min_finder_subselect::cmp_int; break; case STRING_RESULT: op= &select_max_min_finder_subselect::cmp_str; break; case ROW_RESULT: // This case should never be choosen DBUG_ASSERT(0); op= 0; } } cache->store(val_item); it->store(0, cache); } it->assigned(1); DBUG_RETURN(0); } bool select_max_min_finder_subselect::cmp_real() { Item *maxmin= ((Item_singlerow_subselect *)item)->el(0); double val1= cache->val(), val2= maxmin->val(); if (fmax) return (cache->null_value && !maxmin->null_value) || (!cache->null_value && !maxmin->null_value && val1 > val2); else return (maxmin->null_value && !cache->null_value) || (!cache->null_value && !maxmin->null_value && val1 < val2); } bool select_max_min_finder_subselect::cmp_int() { Item *maxmin= ((Item_singlerow_subselect *)item)->el(0); longlong val1= cache->val_int(), val2= maxmin->val_int(); if (fmax) return (cache->null_value && !maxmin->null_value) || (!cache->null_value && !maxmin->null_value && val1 > val2); else return (maxmin->null_value && !cache->null_value) || (!cache->null_value && !maxmin->null_value && val1 < val2); } bool select_max_min_finder_subselect::cmp_str() { String *val1, *val2, buf1, buf2; Item *maxmin= ((Item_singlerow_subselect *)item)->el(0); /* as far as both operand is Item_cache buf1 & buf2 will not be used, but added for safety */ val1= cache->val_str(&buf1); val2= maxmin->val_str(&buf1); if (fmax) return (cache->null_value && !maxmin->null_value) || (!cache->null_value && !maxmin->null_value && sortcmp(val1, val2, cache->collation.collation) > 0) ; else return (maxmin->null_value && !cache->null_value) || (!cache->null_value && !maxmin->null_value && sortcmp(val1, val2, cache->collation.collation) < 0); } bool select_exists_subselect::send_data(List &items) { DBUG_ENTER("select_exists_subselect::send_data"); Item_exists_subselect *it= (Item_exists_subselect *)item; if (unit->offset_limit_cnt) { // Using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } it->value= 1; it->assigned(1); DBUG_RETURN(0); } /*************************************************************************** Dump of select to variables ***************************************************************************/ int select_dumpvar::prepare(List &list, SELECT_LEX_UNIT *u) { List_iterator_fast li(list); List_iterator_fast gl(var_list); Item *item; LEX_STRING *ls; if (var_list.elements != list.elements) { my_error(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT, MYF(0)); return 1; } unit=u; while ((item=li++)) { ls= gl++; Item_func_set_user_var *xx = new Item_func_set_user_var(*ls,item); /* Item_func_set_user_var can't substitute something else on its place => 0 can be passed as last argument (reference on item) */ xx->fix_fields(thd,(TABLE_LIST*) thd->lex->select_lex.table_list.first, 0); xx->fix_length_and_dec(); vars.push_back(xx); } return 0; } /* Statement functions */ Statement::Statement(THD *thd) :id(++thd->statement_id_counter), set_query_id(1), allow_sum_func(0), lex(&main_lex), query(0), query_length(0), free_list(0) { init_sql_alloc(&mem_root, thd->variables.query_alloc_block_size, thd->variables.query_prealloc_size); } /* This constructor is called when statement is a subobject of THD: Some variables are initialized in THD::init due to locking problems This statement object will be used to */ Statement::Statement() :id(0), set_query_id(1), allow_sum_func(0), /* initialized later */ lex(&main_lex), query(0), /* these two are set */ query_length(0), /* in alloc_query() */ free_list(0) { bzero((char *) &mem_root, sizeof(mem_root)); } Statement::Type Statement::type() const { return STATEMENT; } void Statement::set_statement(Statement *stmt) { id= stmt->id; set_query_id= stmt->set_query_id; allow_sum_func= stmt->allow_sum_func; lex= stmt->lex; query= stmt->query; query_length= stmt->query_length; } void Statement::set_n_backup_item_arena(Statement *set, Statement *backup) { backup->set_item_arena(this); set_item_arena(set); } void Statement::restore_backup_item_arena(Statement *set, Statement *backup) { set->set_item_arena(this); set_item_arena(backup); // reset backup mem_root to avoid its freeing init_alloc_root(&backup->mem_root, 0, 0); } void Statement::set_item_arena(Statement *set) { mem_root= set->mem_root; free_list= set->free_list; } Statement::~Statement() { free_root(&mem_root, MYF(0)); } C_MODE_START static byte * get_statement_id_as_hash_key(const byte *record, uint *key_length, my_bool not_used __attribute__((unused))) { const Statement *statement= (const Statement *) record; *key_length= sizeof(statement->id); return (byte *) &((const Statement *) statement)->id; } static void delete_statement_as_hash_key(void *key) { delete (Statement *) key; } C_MODE_END Statement_map::Statement_map() : last_found_statement(0) { enum { START_HASH_SIZE = 16 }; hash_init(&st_hash, default_charset_info, START_HASH_SIZE, 0, 0, get_statement_id_as_hash_key, delete_statement_as_hash_key, MYF(0)); } bool select_dumpvar::send_data(List &items) { List_iterator_fast li(vars); Item_func_set_user_var *xx; DBUG_ENTER("send_data"); if (unit->offset_limit_cnt) { // Using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } if (row_count++) { my_error(ER_TOO_MANY_ROWS, MYF(0)); DBUG_RETURN(1); } while ((xx=li++)) { xx->check(); xx->update(); } DBUG_RETURN(0); } bool select_dumpvar::send_eof() { if (row_count) { ::send_ok(thd,row_count); return 0; } else { my_error(ER_EMPTY_QUERY,MYF(0)); return 1; } } /**************************************************************************** TMP_TABLE_PARAM ****************************************************************************/ void TMP_TABLE_PARAM::init() { field_count= sum_func_count= func_count= hidden_field_count= 0; group_parts= group_length= group_null_parts= 0; quick_group= 1; }