/* Copyright (c) 2002, 2012, Oracle and/or its affiliates. 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ #include "mariadb.h" #include "sql_priv.h" #include "unireg.h" #include "sql_help.h" #include "sql_table.h" // primary_key_name #include "sql_base.h" // REPORT_ALL_ERRORS, setup_tables #include "opt_range.h" // SQL_SELECT #include "records.h" // init_read_record, end_read_record 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->first_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 (thd->mem_root) Item_field(thd, context, {STRING_WITH_LEN("mysql")}, Lex_cstring_strlen(find_fields->table_name), Lex_cstring_strlen(find_fields->field_name))); if (!(find_fields->field= find_field_in_tables(thd, field, tables, NULL, ignored_tables_list_t(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, thd->mem_root); 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, thd->mem_root); } 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) { int count= 0; READ_RECORD read_record_info; DBUG_ENTER("search_topics"); /* Should never happen. As this is part of help, we can ignore this */ if (init_read_record(&read_record_info, thd, topics, select, NULL, 1, 0, FALSE)) DBUG_RETURN(0); while (!read_record_info.read_record()) { 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) { int count= 0; READ_RECORD read_record_info; DBUG_ENTER("search_keyword"); /* Should never happen. As this is part of help, we can ignore this */ if (init_read_record(&read_record_info, thd, keywords, select, NULL, 1, 0, FALSE)) DBUG_RETURN(0); while (!read_record_info.read_record() && 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(primary_key_name.str, &topics->s->keynames, FIND_TYPE_NO_PREFIX) - 1) < 0 || (iindex_relations= find_type(primary_key_name.str, &relations->s->keynames, FIND_TYPE_NO_PREFIX) - 1) < 0) { my_message(ER_CORRUPT_HELP_DB, ER_THD(thd, 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; if (topics->file->ha_index_init(iindex_topic,1) || relations->file->ha_index_init(iindex_relations,1)) { if (topics->file->inited) topics->file->ha_index_end(); my_message(ER_CORRUPT_HELP_DB, ER_THD(thd, ER_CORRUPT_HELP_DB), MYF(0)); DBUG_RETURN(-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->ha_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->ha_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->ha_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"); /* Should never happen. As this is part of help, we can ignore this */ if (init_read_record(&read_record_info, thd, categories, select, NULL, 1, 0, FALSE)) DBUG_RETURN(0); while (!read_record_info.read_record()) { 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, thd->mem_root); } 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) { READ_RECORD read_record_info; DBUG_ENTER("get_all_items_for_category"); /* Should never happen. As this is part of help, we can ignore this */ if (init_read_record(&read_record_info, thd, items, select, NULL, 1, 0, FALSE)) DBUG_VOID_RETURN; while (!read_record_info.read_record()) { if (!select->cond->val_int()) continue; String *name= new (thd->mem_root) String(); get_field(thd->mem_root,pfname,name); res->push_back(name, thd->mem_root); } end_read_record(&read_record_info); DBUG_VOID_RETURN; } /** Collect field names of HELP header that will be sent to a client @param thd Thread data object @param[out] field_list List of fields whose metadata should be collected for sending to client */ static void fill_answer_1_fields(THD *thd, List *field_list) { MEM_ROOT *mem_root= thd->mem_root; field_list->push_back(new (mem_root) Item_empty_string(thd, "name", 64), mem_root); field_list->push_back(new (mem_root) Item_empty_string(thd, "description", 1000), mem_root); field_list->push_back(new (mem_root) Item_empty_string(thd, "example", 1000), mem_root); } /** Send metadata of an answer on help request to a client @param protocol protocol for sending */ static bool send_answer_1_metadata(Protocol *protocol) { List field_list; fill_answer_1_fields(protocol->thd, &field_list); return protocol->send_result_set_metadata(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF); } /* 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 */ static int send_answer_1(Protocol *protocol, String *s1, String *s2, String *s3) { DBUG_ENTER("send_answer_1"); if (send_answer_1_metadata(protocol)) 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); } /** Collect field names of HELP header that will be sent to a client @param thd Thread data object @param[out] field_list List of fields whose metadata should be collected for sending to client @param for_category need column 'source_category_name' */ static void fill_header_2_fields(THD *thd, List *field_list, bool for_category) { MEM_ROOT *mem_root= thd->mem_root; if (for_category) field_list->push_back(new (mem_root) Item_empty_string(thd, "source_category_name", 64), mem_root); field_list->push_back(new (mem_root) Item_empty_string(thd, "name", 64), mem_root); field_list->push_back(new (mem_root) Item_empty_string(thd, "is_it_category", 1), mem_root); } /* Send to client help header SYNOPSIS send_header_2() protocol - protocol for sending for_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_result_set_metadata */ static int send_header_2(Protocol *protocol, bool for_category) { DBUG_ENTER("send_header_2"); List field_list; fill_header_2_fields(protocol->thd, &field_list, for_category); DBUG_RETURN(protocol->send_result_set_metadata(&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; uint length1= str1->length(); uint length2= str2->length(); int tmp= memcmp(str1->ptr(),str2->ptr(), MY_MIN(length1, length2)); if (tmp) return tmp; return (int) length2 - (int) length1; } /* 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) { cond->fix_fields_if_needed(thd, &cond); // can never fail /* Assume that no indexes cover all required fields */ table->covering_keys.clear_all(); table->file->info(HA_STATUS_VARIABLE); table->used_stat_records= table->file->stats.records; SQL_SELECT *res= make_select(table, 0, 0, cond, 0, 0, error); if (unlikely(!res) || unlikely(*error)) goto error; (void) res->check_quick(thd, 0, HA_POS_ERROR); if (!res->quick || res->quick->reset() == 0) return res; error: delete res; return 0; } /* 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 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, size_t mlen, TABLE *table, Field *pfname, int *error) { MEM_ROOT *mem_root= thd->mem_root; Item *cond= new (mem_root) Item_func_like(thd, new (mem_root) Item_field(thd, pfname), new (mem_root) Item_string(thd, mask, (uint)mlen, pfname->charset()), new (mem_root) Item_string_ascii(thd, "\\"), FALSE); if (unlikely(thd->is_fatal_error)) return 0; // OOM return prepare_simple_select(thd, cond, table, error); } /** Initialize the TABLE_LIST with tables used in HELP statement handling. @param thd Thread handler @param tables Array of four TABLE_LIST objects to initialize with data about the tables help_topic, help_category, help_relation, help_keyword */ static void initialize_tables_for_help_command(THD *thd, TABLE_LIST *tables) { LEX_CSTRING MYSQL_HELP_TOPIC_NAME= {STRING_WITH_LEN("help_topic") }; LEX_CSTRING MYSQL_HELP_CATEGORY_NAME= {STRING_WITH_LEN("help_category") }; LEX_CSTRING MYSQL_HELP_RELATION_NAME= {STRING_WITH_LEN("help_relation") }; LEX_CSTRING MYSQL_HELP_KEYWORD_NAME= {STRING_WITH_LEN("help_keyword") }; tables[0].init_one_table(&MYSQL_SCHEMA_NAME, &MYSQL_HELP_TOPIC_NAME, 0, TL_READ); tables[1].init_one_table(&MYSQL_SCHEMA_NAME, &MYSQL_HELP_CATEGORY_NAME, 0, TL_READ); tables[2].init_one_table(&MYSQL_SCHEMA_NAME, &MYSQL_HELP_RELATION_NAME, 0, TL_READ); tables[3].init_one_table(&MYSQL_SCHEMA_NAME, &MYSQL_HELP_KEYWORD_NAME, 0, TL_READ); tables[0].next_global= tables[0].next_local= tables[0].next_name_resolution_table= &tables[1]; tables[1].next_global= tables[1].next_local= tables[1].next_name_resolution_table= &tables[2]; tables[2].next_global= tables[2].next_local= tables[2].next_name_resolution_table= &tables[3]; } /** Setup tables and fields for query. @param thd Thread handler @param first_select_lex SELECT_LEX of the parsed statement @param tables Array of tables used in handling of the HELP statement @param used_fields Array of fields used in handling of the HELP statement @return false on success, else true. */ template static bool init_items_for_help_command(THD *thd, SELECT_LEX *first_select_lex, TABLE_LIST (&tables)[M], st_find_field (& used_fields)[N]) { List leaves; /* Initialize tables and fields to be usable from items. tables do not contain VIEWs => we can pass 0 as conds */ first_select_lex->context.table_list= first_select_lex->context.first_name_resolution_table= &tables[0]; if (setup_tables(thd, &first_select_lex->context, &first_select_lex->top_join_list, &tables[0], leaves, false, false)) return true; memcpy((char*) used_fields, (char*) init_used_fields, sizeof(used_fields[0]) * N); if (init_fields(thd, &tables[0], used_fields, N)) return true; for (size_t i= 0; i < M; i++) tables[i].table->file->init_table_handle_for_HANDLER(); return false; } /** Prepare (in the sense of prepared statement) the HELP statement. @param thd Thread handler @param mask string value passed to the HELP statement @oaram[out] fields fields for result set metadata @return false on success, else true. */ bool mysqld_help_prepare(THD *thd, const char *mask, List *fields) { TABLE_LIST tables[4]; st_find_field used_fields[array_elements(init_used_fields)]; SQL_SELECT *select; List topics_list; Sql_mode_instant_remove sms(thd, MODE_PAD_CHAR_TO_FULL_LENGTH); initialize_tables_for_help_command(thd, tables); /* HELP must be available under LOCK TABLES. Reset and backup the current open tables state to make it possible. */ start_new_trans new_trans(thd); if (open_system_tables_for_read(thd, tables)) return true; auto cleanup_and_return= [&](bool ret) { thd->commit_whole_transaction_and_close_tables(); new_trans.restore_old_transaction(); return ret; }; if (init_items_for_help_command(thd, thd->lex->first_select_lex(), tables, used_fields)) return cleanup_and_return(false); size_t mlen= strlen(mask); int error; /* Prepare the query 'SELECT * FROM help_topic WHERE name LIKE mask' for execution */ if (!(select= prepare_select_for_name(thd,mask, mlen, tables[0].table, used_fields[help_topic_name].field, &error))) return cleanup_and_return(true); String name, description, example; /* Run the query 'SELECT * FROM help_topic WHERE name LIKE mask' */ int count_topics= search_topics(thd, tables[0].table, used_fields, select, &topics_list, &name, &description, &example); delete select; if (thd->is_error()) return cleanup_and_return(true); if (count_topics == 0) { int UNINIT_VAR(key_id); /* Prepare the query 'SELECT * FROM help_keyword WHERE name LIKE mask' for execution */ if (!(select= prepare_select_for_name(thd, mask, mlen, tables[3].table, used_fields[help_keyword_name].field, &error))) return cleanup_and_return(true); /* Run the query 'SELECT * FROM help_keyword WHERE name LIKE mask' */ 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) { if (!(select= prepare_select_for_name(thd, mask, mlen, tables[1].table, used_fields[help_category_name].field, &error))) return cleanup_and_return(true); List categories_list; int16 category_id; int count_categories= search_categories(thd, tables[1].table, used_fields, select, &categories_list,&category_id); delete select; if (count_categories == 1) fill_header_2_fields(thd, fields, true); else fill_header_2_fields(thd, fields, false); } else if (count_topics == 1) fill_answer_1_fields(thd, fields); else fill_header_2_fields(thd, fields, false); return cleanup_and_return(false); } /* Server-side function 'help' SYNOPSIS mysqld_help() thd Thread handler RETURN VALUES FALSE Success TRUE Error and send_error already committed */ static bool mysqld_help_internal(THD *thd, const char *mask) { Protocol *protocol= thd->protocol; SQL_SELECT *select; st_find_field used_fields[array_elements(init_used_fields)]; TABLE_LIST tables[4]; List topics_list, categories_list, subcategories_list; String name, description, example; int count_topics, count_categories, error; size_t mlen= strlen(mask); MEM_ROOT *mem_root= thd->mem_root; DBUG_ENTER("mysqld_help"); initialize_tables_for_help_command(thd, tables); /* HELP must be available under LOCK TABLES. Reset and backup the current open tables state to make it possible. */ start_new_trans new_trans(thd); if (open_system_tables_for_read(thd, tables)) goto error2; if (init_items_for_help_command(thd, thd->lex->first_select_lex(), tables, used_fields)) goto error; if (!(select= prepare_select_for_name(thd,mask,mlen,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 (thd->is_error()) goto error; if (count_topics == 0) { int UNINIT_VAR(key_id); if (!(select= prepare_select_for_name(thd,mask,mlen,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[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 (mem_root) Item_func_equal(thd, new (mem_root) Item_field(thd, topic_cat_id), new (mem_root) Item_int(thd, (int32) category_id)); Item *cond_cat_by_cat= new (mem_root) Item_func_equal(thd, new (mem_root) Item_field(thd, cat_cat_id), new (mem_root) Item_int(thd, (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[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); thd->commit_whole_transaction_and_close_tables(); new_trans.restore_old_transaction(); DBUG_RETURN(FALSE); error: thd->commit_whole_transaction_and_close_tables(); new_trans.restore_old_transaction(); error2: if (!thd->is_error()) my_eof(thd); DBUG_RETURN(thd->is_error()); } bool mysqld_help(THD *thd, const char *mask) { Sql_mode_instant_remove sms(thd, MODE_PAD_CHAR_TO_FULL_LENGTH); bool rc= mysqld_help_internal(thd, mask); return rc; }