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407e9b78cf64a3b8aca441ab585601e173f9ba32
mariadb/sql/sql_help.cc
Monty b6ff139aa3 Reduce usage of strlen() 
Changes:
- To detect automatic strlen() I removed the methods in String that
  uses 'const char *' without a length:
  - String::append(const char*)
  - Binary_string(const char *str)
  - String(const char *str, CHARSET_INFO *cs)
  - append_for_single_quote(const char *)
  All usage of append(const char*) is changed to either use
  String::append(char), String::append(const char*, size_t length) or
  String::append(LEX_CSTRING)
- Added STRING_WITH_LEN() around constant string arguments to
  String::append()
- Added overflow argument to escape_string_for_mysql() and
  escape_quotes_for_mysql() instead of returning (size_t) -1 on overflow.
  This was needed as most usage of the above functions never tested the
  result for -1 and would have given wrong results or crashes in case
  of overflows.
- Added Item_func_or_sum::func_name_cstring(), which returns LEX_CSTRING.
  Changed all Item_func::func_name()'s to func_name_cstring()'s.
  The old Item_func_or_sum::func_name() is now an inline function that
  returns func_name_cstring().str.
- Changed Item::mode_name() and Item::func_name_ext() to return
  LEX_CSTRING.
- Changed for some functions the name argument from const char * to
  to const LEX_CSTRING &:
  - Item::Item_func_fix_attributes()
  - Item::check_type_...()
  - Type_std_attributes::agg_item_collations()
  - Type_std_attributes::agg_item_set_converter()
  - Type_std_attributes::agg_arg_charsets...()
  - Type_handler_hybrid_field_type::aggregate_for_result()
  - Type_handler_geometry::check_type_geom_or_binary()
  - Type_handler::Item_func_or_sum_illegal_param()
  - Predicant_to_list_comparator::add_value_skip_null()
  - Predicant_to_list_comparator::add_value()
  - cmp_item_row::prepare_comparators()
  - cmp_item_row::aggregate_row_elements_for_comparison()
  - Cursor_ref::print_func()
- Removes String_space() as it was only used in one cases and that
  could be simplified to not use String_space(), thanks to the fixed
  my_vsnprintf().
- Added some const LEX_CSTRING's for common strings:
  - NULL_clex_str, DATA_clex_str, INDEX_clex_str.
- Changed primary_key_name to a LEX_CSTRING
- Renamed String::set_quick() to String::set_buffer_if_not_allocated() to
  clarify what the function really does.
- Rename of protocol function:
  bool store(const char *from, CHARSET_INFO *cs) to
  bool store_string_or_null(const char *from, CHARSET_INFO *cs).
  This was done to both clarify the difference between this 'store' function
  and also to make it easier to find unoptimal usage of store() calls.
- Added Protocol::store(const LEX_CSTRING*, CHARSET_INFO*)
- Changed some 'const char*' arrays to instead be of type LEX_CSTRING.
- class Item_func_units now used LEX_CSTRING for name.

Other things:
- Fixed a bug in mysql.cc:construct_prompt() where a wrong escape character
  in the prompt would cause some part of the prompt to be duplicated.
- Fixed a lot of instances where the length of the argument to
  append is known or easily obtain but was not used.
- Removed some not needed 'virtual' definition for functions that was
  inherited from the parent. I added override to these.
- Fixed Ordered_key::print() to preallocate needed buffer. Old code could
  case memory overruns.
- Simplified some loops when adding char * to a String with delimiters.
2021-05-19 22:27:48 +02:00

875 lines
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/* 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<String> *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<String> *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<String> *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<String> *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<String> *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;
}
/*
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)
{
THD *thd= protocol->thd;
MEM_ROOT *mem_root= thd->mem_root;
DBUG_ENTER("send_answer_1");
List<Item> field_list;
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);
if (protocol->send_result_set_metadata(&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_result_set_metadata
*/
int send_header_2(Protocol *protocol, bool for_category)
{
THD *thd= protocol->thd;
MEM_ROOT *mem_root= thd->mem_root;
DBUG_ENTER("send_header_2");
List<Item> field_list;
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);
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 : <name>
column2 : <is_it_category>
SYNOPSIS
send_variant_2_list()
protocol Protocol for sending
names List of names
cat Value of the column <is_it_category>
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<String> *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<String> 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 <Item>
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();
SQL_SELECT *res= make_select(table, 0, 0, cond, 0, 0, error);
if (unlikely(*error) ||
(likely(res) && unlikely(res->check_quick(thd, 0, HA_POS_ERROR))) ||
(likely(res) && res->quick && unlikely(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, size_t mlen,
TABLE_LIST *tables, 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);
}
/*
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)];
List<TABLE_LIST> leaves;
TABLE_LIST tables[4];
List<String> topics_list, categories_list, subcategories_list;
String name, description, example;
int count_topics, count_categories, error;
size_t mlen= strlen(mask);
size_t i;
MEM_ROOT *mem_root= thd->mem_root;
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") };
DBUG_ENTER("mysqld_help");
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];
/*
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;
/*
Init tables and fields to be usable from items
tables do not contain VIEWs => we can pass 0 as conds
*/
thd->lex->first_select_lex()->context.table_list=
thd->lex->first_select_lex()->context.first_name_resolution_table=
&tables[0];
if (setup_tables(thd, &thd->lex->first_select_lex()->context,
&thd->lex->first_select_lex()->top_join_list,
tables, leaves, FALSE, 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; i<sizeof(tables)/sizeof(TABLE_LIST); i++)
tables[i].table->file->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 (thd->is_error())
goto error;
if (count_topics == 0)
{
int UNINIT_VAR(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 (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,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:
DBUG_RETURN(TRUE);
}
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;
}
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