/* Copyright (C) 2000 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 */ #include "mysql_priv.h" struct st_find_field { const char *table_name, *field_name; Field *field; }; /* Used fields */ static struct st_find_field init_used_fields[]= { { "help_topic", "help_topic_id", 0}, { "help_topic", "name", 0}, { "help_topic", "help_category_id", 0}, { "help_topic", "description", 0}, { "help_topic", "example", 0}, { "help_category", "help_category_id", 0}, { "help_category", "parent_category_id", 0}, { "help_category", "name", 0}, { "help_keyword", "help_keyword_id", 0}, { "help_keyword", "name", 0}, { "help_relation", "help_topic_id", 0}, { "help_relation", "help_keyword_id", 0} }; enum enum_used_fields { help_topic_help_topic_id= 0, help_topic_name, help_topic_help_category_id, help_topic_description, help_topic_example, help_category_help_category_id, help_category_parent_category_id, help_category_name, help_keyword_help_keyword_id, help_keyword_name, help_relation_help_topic_id, help_relation_help_keyword_id }; /* Fill st_find_field structure with pointers to fields SYNOPSIS init_fields() thd Thread handler tables list of all tables for fields find_fields array of structures count size of previous array RETURN VALUES 0 all ok 1 one of the fileds was not found */ static bool init_fields(THD *thd, TABLE_LIST *tables, struct st_find_field *find_fields, uint count) { Name_resolution_context *context= &thd->lex->select_lex.context; DBUG_ENTER("init_fields"); context->resolve_in_table_list_only(tables); for (; count-- ; find_fields++) { /* We have to use 'new' here as field will be re_linked on free */ Item_field *field= new Item_field(context, "mysql", find_fields->table_name, find_fields->field_name); if (!(find_fields->field= find_field_in_tables(thd, field, tables, NULL, 0, REPORT_ALL_ERRORS, 1, TRUE))) DBUG_RETURN(1); bitmap_set_bit(find_fields->field->table->read_set, find_fields->field->field_index); /* To make life easier when setting values in keys */ bitmap_set_bit(find_fields->field->table->write_set, find_fields->field->field_index); } DBUG_RETURN(0); } /* Returns variants of found topic for help (if it is just single topic, returns description and example, or else returns only names..) SYNOPSIS memorize_variant_topic() thd Thread handler topics Table of topics count number of alredy found topics find_fields Filled array of information for work with fields RETURN VALUES names array of names of found topics (out) name name of found topic (out) description description of found topic (out) example example for found topic (out) NOTE Field 'names' is set only if more than one topic is found. Fields 'name', 'description', 'example' are set only if found exactly one topic. */ void memorize_variant_topic(THD *thd, TABLE *topics, int count, struct st_find_field *find_fields, List *names, String *name, String *description, String *example) { DBUG_ENTER("memorize_variant_topic"); MEM_ROOT *mem_root= thd->mem_root; if (count==0) { get_field(mem_root,find_fields[help_topic_name].field, name); get_field(mem_root,find_fields[help_topic_description].field, description); get_field(mem_root,find_fields[help_topic_example].field, example); } else { if (count == 1) names->push_back(name); String *new_name= new (thd->mem_root) String; get_field(mem_root,find_fields[help_topic_name].field,new_name); names->push_back(new_name); } DBUG_VOID_RETURN; } /* Look for topics by mask SYNOPSIS search_topics() thd Thread handler topics Table of topics find_fields Filled array of info for fields select Function to test for matching help topic. Normally 'help_topic.name like 'bit%' RETURN VALUES # number of topics found names array of names of found topics (out) name name of found topic (out) description description of found topic (out) example example for found topic (out) NOTE Field 'names' is set only if more than one topic was found. Fields 'name', 'description', 'example' are set only if exactly one topic was found. */ int search_topics(THD *thd, TABLE *topics, struct st_find_field *find_fields, SQL_SELECT *select, List *names, String *name, String *description, String *example) { DBUG_ENTER("search_topics"); int count= 0; READ_RECORD read_record_info; init_read_record(&read_record_info, thd, topics, select, 1, 0, FALSE); while (!read_record_info.read_record(&read_record_info)) { if (!select->cond->val_int()) // Doesn't match like continue; memorize_variant_topic(thd,topics,count,find_fields, names,name,description,example); count++; } end_read_record(&read_record_info); DBUG_RETURN(count); } /* Look for keyword by mask SYNOPSIS search_keyword() thd Thread handler keywords Table of keywords find_fields Filled array of info for fields select Function to test for matching keyword. Normally 'help_keyword.name like 'bit%' key_id help_keyword_if of found topics (out) RETURN VALUES 0 didn't find any topics matching the mask 1 found exactly one topic matching the mask 2 found more then one topic matching the mask */ int search_keyword(THD *thd, TABLE *keywords, struct st_find_field *find_fields, SQL_SELECT *select, int *key_id) { DBUG_ENTER("search_keyword"); int count= 0; READ_RECORD read_record_info; init_read_record(&read_record_info, thd, keywords, select, 1, 0, FALSE); while (!read_record_info.read_record(&read_record_info) && count<2) { if (!select->cond->val_int()) // Dosn't match like continue; *key_id= (int)find_fields[help_keyword_help_keyword_id].field->val_int(); count++; } end_read_record(&read_record_info); DBUG_RETURN(count); } /* Look for all topics with keyword SYNOPSIS get_topics_for_keyword() thd Thread handler topics Table of topics relations Table of m:m relation "topic/keyword" find_fields Filled array of info for fields key_id Primary index to use to find for keyword RETURN VALUES # number of topics found names array of name of found topics (out) name name of found topic (out) description description of found topic (out) example example for found topic (out) NOTE Field 'names' is set only if more than one topic was found. Fields 'name', 'description', 'example' are set only if exactly one topic was found. */ int get_topics_for_keyword(THD *thd, TABLE *topics, TABLE *relations, struct st_find_field *find_fields, int16 key_id, List *names, String *name, String *description, String *example) { uchar buff[8]; // Max int length int count= 0; int iindex_topic, iindex_relations; Field *rtopic_id, *rkey_id; DBUG_ENTER("get_topics_for_keyword"); if ((iindex_topic= find_type((char*) primary_key_name, &topics->s->keynames, 1+2)-1)<0 || (iindex_relations= find_type((char*) primary_key_name, &relations->s->keynames, 1+2)-1)<0) { my_message(ER_CORRUPT_HELP_DB, ER(ER_CORRUPT_HELP_DB), MYF(0)); DBUG_RETURN(-1); } rtopic_id= find_fields[help_relation_help_topic_id].field; rkey_id= find_fields[help_relation_help_keyword_id].field; topics->file->ha_index_init(iindex_topic,1); relations->file->ha_index_init(iindex_relations,1); rkey_id->store((longlong) key_id, TRUE); rkey_id->get_key_image(buff, rkey_id->pack_length(), Field::itRAW); int key_res= relations->file->index_read_map(relations->record[0], buff, (key_part_map) 1, HA_READ_KEY_EXACT); for ( ; !key_res && key_id == (int16) rkey_id->val_int() ; key_res= relations->file->index_next(relations->record[0])) { uchar topic_id_buff[8]; longlong topic_id= rtopic_id->val_int(); Field *field= find_fields[help_topic_help_topic_id].field; field->store((longlong) topic_id, TRUE); field->get_key_image(topic_id_buff, field->pack_length(), Field::itRAW); if (!topics->file->index_read_map(topics->record[0], topic_id_buff, (key_part_map)1, HA_READ_KEY_EXACT)) { memorize_variant_topic(thd,topics,count,find_fields, names,name,description,example); count++; } } topics->file->ha_index_end(); relations->file->ha_index_end(); DBUG_RETURN(count); } /* Look for categories by mask SYNOPSIS search_categories() thd THD for init_read_record categories Table of categories find_fields Filled array of info for fields select Function to test for if matching help topic. Normally 'help_vategory.name like 'bit%' names List of found categories names (out) res_id Primary index of found category (only if found exactly one category) RETURN VALUES # Number of categories found */ int search_categories(THD *thd, TABLE *categories, struct st_find_field *find_fields, SQL_SELECT *select, List *names, int16 *res_id) { Field *pfname= find_fields[help_category_name].field; Field *pcat_id= find_fields[help_category_help_category_id].field; int count= 0; READ_RECORD read_record_info; DBUG_ENTER("search_categories"); init_read_record(&read_record_info, thd, categories, select,1,0,FALSE); while (!read_record_info.read_record(&read_record_info)) { if (select && !select->cond->val_int()) continue; String *lname= new (thd->mem_root) String; get_field(thd->mem_root,pfname,lname); if (++count == 1 && res_id) *res_id= (int16) pcat_id->val_int(); names->push_back(lname); } end_read_record(&read_record_info); DBUG_RETURN(count); } /* Look for all topics or subcategories of category SYNOPSIS get_all_items_for_category() thd Thread handler items Table of items pfname Field "name" in items select "where" part of query.. res list of finded names */ void get_all_items_for_category(THD *thd, TABLE *items, Field *pfname, SQL_SELECT *select, List *res) { DBUG_ENTER("get_all_items_for_category"); READ_RECORD read_record_info; init_read_record(&read_record_info, thd, items, select,1,0,FALSE); while (!read_record_info.read_record(&read_record_info)) { if (!select->cond->val_int()) continue; String *name= new (thd->mem_root) String(); get_field(thd->mem_root,pfname,name); res->push_back(name); } end_read_record(&read_record_info); DBUG_VOID_RETURN; } /* Send to client answer for help request SYNOPSIS send_answer_1() protocol - protocol for sending s1 - value of column "Name" s2 - value of column "Description" s3 - value of column "Example" IMPLEMENTATION Format used: +----------+------------+------------+ |name |description |example | +----------+------------+------------+ |String(64)|String(1000)|String(1000)| +----------+------------+------------+ with exactly one row! RETURN VALUES 1 Writing of head failed -1 Writing of row failed 0 Successeful send */ int send_answer_1(Protocol *protocol, String *s1, String *s2, String *s3) { DBUG_ENTER("send_answer_1"); List field_list; field_list.push_back(new Item_empty_string("name",64)); field_list.push_back(new Item_empty_string("description",1000)); field_list.push_back(new Item_empty_string("example",1000)); if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(1); protocol->prepare_for_resend(); protocol->store(s1); protocol->store(s2); protocol->store(s3); if (protocol->write()) DBUG_RETURN(-1); DBUG_RETURN(0); } /* Send to client help header SYNOPSIS send_header_2() protocol - protocol for sending is_it_category - need column 'source_category_name' IMPLEMENTATION +- -+ |+-------------------- | +----------+--------------+ ||source_category_name | |name |is_it_category| |+-------------------- | +----------+--------------+ ||String(64) | |String(64)|String(1) | |+-------------------- | +----------+--------------+ +- -+ RETURN VALUES result of protocol->send_fields */ int send_header_2(Protocol *protocol, bool for_category) { DBUG_ENTER("send_header_2"); List field_list; if (for_category) field_list.push_back(new Item_empty_string("source_category_name",64)); field_list.push_back(new Item_empty_string("name",64)); field_list.push_back(new Item_empty_string("is_it_category",1)); DBUG_RETURN(protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)); } /* strcmp for using in qsort SYNOPSIS strptrcmp() ptr1 (const void*)&str1 ptr2 (const void*)&str2 RETURN VALUES same as strcmp */ extern "C" int string_ptr_cmp(const void* ptr1, const void* ptr2) { String *str1= *(String**)ptr1; String *str2= *(String**)ptr2; return strcmp(str1->c_ptr(),str2->c_ptr()); } /* Send to client rows in format: column1 : column2 : SYNOPSIS send_variant_2_list() protocol Protocol for sending names List of names cat Value of the column source_name name of category for all items.. RETURN VALUES -1 Writing fail 0 Data was successefully send */ int send_variant_2_list(MEM_ROOT *mem_root, Protocol *protocol, List *names, const char *cat, String *source_name) { DBUG_ENTER("send_variant_2_list"); String **pointers= (String**)alloc_root(mem_root, sizeof(String*)*names->elements); String **pos; String **end= pointers + names->elements; List_iterator it(*names); for (pos= pointers; pos!=end; (*pos++= it++)); my_qsort(pointers,names->elements,sizeof(String*),string_ptr_cmp); for (pos= pointers; pos!=end; pos++) { protocol->prepare_for_resend(); if (source_name) protocol->store(source_name); protocol->store(*pos); protocol->store(cat,1,&my_charset_latin1); if (protocol->write()) DBUG_RETURN(-1); } DBUG_RETURN(0); } /* Prepare simple SQL_SELECT table.* WHERE SYNOPSIS prepare_simple_select() thd Thread handler cond WHERE part of select table goal table error code of error (out) RETURN VALUES # created SQL_SELECT */ SQL_SELECT *prepare_simple_select(THD *thd, Item *cond, TABLE *table, int *error) { if (!cond->fixed) cond->fix_fields(thd, &cond); // can never fail /* Assume that no indexes cover all required fields */ table->covering_keys.clear_all(); SQL_SELECT *res= make_select(table, 0, 0, cond, 0, error); if (*error || (res && res->check_quick(thd, 0, HA_POS_ERROR)) || (res && res->quick && res->quick->reset())) { delete res; res=0; } return res; } /* Prepare simple SQL_SELECT table.* WHERE table.name LIKE mask SYNOPSIS prepare_select_for_name() thd Thread handler mask mask for compare with name mlen length of mask tables list of tables, used in WHERE table goal table pfname field "name" in table error code of error (out) RETURN VALUES # created SQL_SELECT */ SQL_SELECT *prepare_select_for_name(THD *thd, const char *mask, uint mlen, TABLE_LIST *tables, TABLE *table, Field *pfname, int *error) { Item *cond= new Item_func_like(new Item_field(pfname), new Item_string(mask,mlen,pfname->charset()), new Item_string("\\",1,&my_charset_latin1), FALSE); if (thd->is_fatal_error) return 0; // OOM return prepare_simple_select(thd, cond, table, error); } /* Server-side function 'help' SYNOPSIS mysqld_help() thd Thread handler RETURN VALUES FALSE Success TRUE Error and send_error already commited */ bool mysqld_help(THD *thd, const char *mask) { Protocol *protocol= thd->protocol; SQL_SELECT *select; st_find_field used_fields[array_elements(init_used_fields)]; TABLE_LIST *leaves= 0; TABLE_LIST tables[4]; List topics_list, categories_list, subcategories_list; String name, description, example; int count_topics, count_categories, error; uint mlen= strlen(mask); size_t i; MEM_ROOT *mem_root= thd->mem_root; DBUG_ENTER("mysqld_help"); bzero((uchar*)tables,sizeof(tables)); tables[0].alias= tables[0].table_name= (char*) "help_topic"; tables[0].lock_type= TL_READ; tables[0].next_global= tables[0].next_local= tables[0].next_name_resolution_table= &tables[1]; tables[1].alias= tables[1].table_name= (char*) "help_category"; tables[1].lock_type= TL_READ; tables[1].next_global= tables[1].next_local= tables[1].next_name_resolution_table= &tables[2]; tables[2].alias= tables[2].table_name= (char*) "help_relation"; tables[2].lock_type= TL_READ; tables[2].next_global= tables[2].next_local= tables[2].next_name_resolution_table= &tables[3]; tables[3].alias= tables[3].table_name= (char*) "help_keyword"; tables[3].lock_type= TL_READ; tables[0].db= tables[1].db= tables[2].db= tables[3].db= (char*) "mysql"; Open_tables_state open_tables_state_backup; if (open_system_tables_for_read(thd, tables, &open_tables_state_backup)) goto error2; /* Init tables and fields to be usable from items tables do not contain VIEWs => we can pass 0 as conds */ thd->lex->select_lex.context.table_list= thd->lex->select_lex.context.first_name_resolution_table= &tables[0]; if (setup_tables(thd, &thd->lex->select_lex.context, &thd->lex->select_lex.top_join_list, tables, &leaves, FALSE)) goto error; memcpy((char*) used_fields, (char*) init_used_fields, sizeof(used_fields)); if (init_fields(thd, tables, used_fields, array_elements(used_fields))) goto error; for (i=0; ifile->init_table_handle_for_HANDLER(); if (!(select= prepare_select_for_name(thd,mask,mlen,tables,tables[0].table, used_fields[help_topic_name].field,&error))) goto error; count_topics= search_topics(thd,tables[0].table,used_fields, select,&topics_list, &name, &description, &example); delete select; if (count_topics == 0) { int key_id; if (!(select= prepare_select_for_name(thd,mask,mlen,tables,tables[3].table, used_fields[help_keyword_name].field, &error))) goto error; count_topics= search_keyword(thd,tables[3].table, used_fields, select, &key_id); delete select; count_topics= (count_topics != 1) ? 0 : get_topics_for_keyword(thd,tables[0].table,tables[2].table, used_fields,key_id,&topics_list,&name, &description,&example); } if (count_topics == 0) { int16 category_id; Field *cat_cat_id= used_fields[help_category_parent_category_id].field; if (!(select= prepare_select_for_name(thd,mask,mlen,tables,tables[1].table, used_fields[help_category_name].field, &error))) goto error; count_categories= search_categories(thd, tables[1].table, used_fields, select, &categories_list,&category_id); delete select; if (!count_categories) { if (send_header_2(protocol,FALSE)) goto error; } else if (count_categories > 1) { if (send_header_2(protocol,FALSE) || send_variant_2_list(mem_root,protocol,&categories_list,"Y",0)) goto error; } else { Field *topic_cat_id= used_fields[help_topic_help_category_id].field; Item *cond_topic_by_cat= new Item_func_equal(new Item_field(topic_cat_id), new Item_int((int32)category_id)); Item *cond_cat_by_cat= new Item_func_equal(new Item_field(cat_cat_id), new Item_int((int32)category_id)); if (!(select= prepare_simple_select(thd, cond_topic_by_cat, tables[0].table, &error))) goto error; get_all_items_for_category(thd,tables[0].table, used_fields[help_topic_name].field, select,&topics_list); delete select; if (!(select= prepare_simple_select(thd, cond_cat_by_cat, tables[1].table, &error))) goto error; get_all_items_for_category(thd,tables[1].table, used_fields[help_category_name].field, select,&subcategories_list); delete select; String *cat= categories_list.head(); if (send_header_2(protocol, TRUE) || send_variant_2_list(mem_root,protocol,&topics_list, "N",cat) || send_variant_2_list(mem_root,protocol,&subcategories_list,"Y",cat)) goto error; } } else if (count_topics == 1) { if (send_answer_1(protocol,&name,&description,&example)) goto error; } else { /* First send header and functions */ if (send_header_2(protocol, FALSE) || send_variant_2_list(mem_root,protocol, &topics_list, "N", 0)) goto error; if (!(select= prepare_select_for_name(thd,mask,mlen,tables,tables[1].table, used_fields[help_category_name].field,&error))) goto error; search_categories(thd, tables[1].table, used_fields, select,&categories_list, 0); delete select; /* Then send categories */ if (send_variant_2_list(mem_root,protocol, &categories_list, "Y", 0)) goto error; } my_eof(thd); close_system_tables(thd, &open_tables_state_backup); DBUG_RETURN(FALSE); error: close_system_tables(thd, &open_tables_state_backup); error2: DBUG_RETURN(TRUE); }