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mariadb/sql/sql_base.cc
dlenev@mysql.com 263b33e12d Fix for bug #4131 "TIMESTAMP columns missing minutes and seconds when 
using GROUP BY"
Now we are setting Field_timestamp::field_length to 19 in open_table()
if we are in new mode (and we are restoring it back when we are coming
back to normal mode). This also should solve potential problems with
some of LOAD DATA INFILE and SELECT * INTO in this mode.
2004-09-27 00:50:00 +04:00

2500 lines
66 KiB
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/* 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 */
/* Basic functions needed by many modules */
#include "mysql_priv.h"
#include "sql_acl.h"
#include <m_ctype.h>
#include <my_dir.h>
#include <hash.h>
#include <nisam.h>
#include <assert.h>
#ifdef __WIN__
#include <io.h>
#endif
TABLE *unused_tables; /* Used by mysql_test */
HASH open_cache; /* Used by mysql_test */
static int open_unireg_entry(THD *thd,TABLE *entry,const char *db,
const char *name, const char *alias);
static void free_cache_entry(TABLE *entry);
static void mysql_rm_tmp_tables(void);
static key_map get_key_map_from_key_list(TABLE *table,
List<String> *index_list);
extern "C" byte *table_cache_key(const byte *record,uint *length,
my_bool not_used __attribute__((unused)))
{
TABLE *entry=(TABLE*) record;
*length=entry->key_length;
return (byte*) entry->table_cache_key;
}
bool table_cache_init(void)
{
mysql_rm_tmp_tables();
return hash_init(&open_cache,table_cache_size+16,0,0,table_cache_key,
(hash_free_key) free_cache_entry,0) != 0;
}
void table_cache_free(void)
{
DBUG_ENTER("table_cache_free");
close_cached_tables((THD*) 0,0,(TABLE_LIST*) 0);
if (!open_cache.records) // Safety first
hash_free(&open_cache);
DBUG_VOID_RETURN;
}
uint cached_tables(void)
{
return open_cache.records;
}
#ifdef EXTRA_DEBUG
static void check_unused(void)
{
uint count=0,idx=0;
TABLE *cur_link,*start_link;
if ((start_link=cur_link=unused_tables))
{
do
{
if (cur_link != cur_link->next->prev || cur_link != cur_link->prev->next)
{
DBUG_PRINT("error",("Unused_links aren't linked properly")); /* purecov: inspected */
return; /* purecov: inspected */
}
} while (count++ < open_cache.records &&
(cur_link=cur_link->next) != start_link);
if (cur_link != start_link)
{
DBUG_PRINT("error",("Unused_links aren't connected")); /* purecov: inspected */
}
}
for (idx=0 ; idx < open_cache.records ; idx++)
{
TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
if (!entry->in_use)
count--;
}
if (count != 0)
{
DBUG_PRINT("error",("Unused_links doesn't match open_cache: diff: %d", /* purecov: inspected */
count)); /* purecov: inspected */
}
}
#else
#define check_unused()
#endif
/*
Create a list for all open tables matching SQL expression
SYNOPSIS
list_open_tables()
thd Thread THD
wild SQL like expression
NOTES
One gets only a list of tables for which one has any kind of privilege.
db and table names are allocated in result struct, so one doesn't need
a lock on LOCK_open when traversing the return list.
RETURN VALUES
NULL Error (Probably OOM)
# Pointer to list of names of open tables.
*/
OPEN_TABLE_LIST *list_open_tables(THD *thd, const char *wild)
{
int result = 0;
OPEN_TABLE_LIST **start_list, *open_list;
TABLE_LIST table_list;
char name[NAME_LEN*2];
DBUG_ENTER("list_open_tables");
VOID(pthread_mutex_lock(&LOCK_open));
bzero((char*) &table_list,sizeof(table_list));
start_list= &open_list;
open_list=0;
for (uint idx=0 ; result == 0 && idx < open_cache.records; idx++)
{
OPEN_TABLE_LIST *table;
TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
if ((!entry->real_name))
continue; // Shouldn't happen
if (wild)
{
strxmov(name,entry->table_cache_key,".",entry->real_name,NullS);
if (wild_compare(name,wild,0))
continue;
}
/* Check if user has SELECT privilege for any column in the table */
table_list.db= (char*) entry->table_cache_key;
table_list.real_name= entry->real_name;
table_list.grant.privilege=0;
if (check_table_access(thd,SELECT_ACL | EXTRA_ACL,&table_list,1))
continue;
/* need to check if we haven't already listed it */
for (table= open_list ; table ; table=table->next)
{
if (!strcmp(table->table,entry->real_name) &&
!strcmp(table->db,entry->table_cache_key))
{
if (entry->in_use)
table->in_use++;
if (entry->locked_by_name)
table->locked++;
break;
}
}
if (table)
continue;
if (!(*start_list = (OPEN_TABLE_LIST *)
sql_alloc(sizeof(**start_list)+entry->key_length)))
{
open_list=0; // Out of memory
break;
}
strmov((*start_list)->table=
strmov(((*start_list)->db= (char*) ((*start_list)+1)),
entry->table_cache_key)+1,
entry->real_name);
(*start_list)->in_use= entry->in_use ? 1 : 0;
(*start_list)->locked= entry->locked_by_name ? 1 : 0;
start_list= &(*start_list)->next;
*start_list=0;
}
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(open_list);
}
/******************************************************************************
** Send name and type of result to client.
** Sum fields has table name empty and field_name.
** flag is a bit mask with the following functions:
** 1 send number of rows
** 2 send default values
** 4 Don't convert field names
******************************************************************************/
bool
send_fields(THD *thd,List<Item> &list,uint flag)
{
List_iterator_fast<Item> it(list);
Item *item;
char buff[80];
CONVERT *convert= (flag & 4) ? (CONVERT*) 0 : thd->variables.convert_set;
DBUG_ENTER("send_fields");
String tmp((char*) buff,sizeof(buff)),*res,*packet= &thd->packet;
if (thd->fatal_error) // We have got an error
goto err;
if (flag & 1)
{ // Packet with number of elements
char *pos=net_store_length(buff,(uint) list.elements);
(void) my_net_write(&thd->net, buff,(uint) (pos-buff));
}
while ((item=it++))
{
char *pos;
Send_field field;
item->make_field(&field);
packet->length(0);
if (convert)
{
if (convert->store(packet,field.table_name,
(uint) strlen(field.table_name)) ||
convert->store(packet,field.col_name,
(uint) strlen(field.col_name)) ||
packet->realloc(packet->length()+10))
goto err;
}
else if (net_store_data(packet,field.table_name) ||
net_store_data(packet,field.col_name) ||
packet->realloc(packet->length()+10))
goto err; /* purecov: inspected */
pos= (char*) packet->ptr()+packet->length();
if (!(thd->client_capabilities & CLIENT_LONG_FLAG))
{
packet->length(packet->length()+9);
pos[0]=3; int3store(pos+1,field.length);
pos[4]=1; pos[5]=field.type;
pos[6]=2; pos[7]=(char) field.flags; pos[8]= (char) field.decimals;
}
else
{
packet->length(packet->length()+10);
pos[0]=3; int3store(pos+1,field.length);
pos[4]=1; pos[5]=field.type;
pos[6]=3; int2store(pos+7,field.flags); pos[9]= (char) field.decimals;
}
if (flag & 2)
{ // Send default value
if (!(res=item->val_str(&tmp)))
{
if (net_store_null(packet))
goto err;
}
else if (net_store_data(packet,res->ptr(),res->length()))
goto err;
}
if (my_net_write(&thd->net, (char*) packet->ptr(),packet->length()))
break; /* purecov: inspected */
}
send_eof(&thd->net,1);
DBUG_RETURN(0);
err:
send_error(&thd->net,ER_OUT_OF_RESOURCES); /* purecov: inspected */
DBUG_RETURN(1); /* purecov: inspected */
}
/*****************************************************************************
* Functions to free open table cache
****************************************************************************/
void intern_close_table(TABLE *table)
{ // Free all structures
free_io_cache(table);
if (table->file)
VOID(closefrm(table)); // close file
}
/*
Remove table from the open table cache
SYNOPSIS
free_cache_entry()
table Table to remove
NOTE
We need to have a lock on LOCK_open when calling this
*/
static void free_cache_entry(TABLE *table)
{
DBUG_ENTER("free_cache_entry");
safe_mutex_assert_owner(&LOCK_open);
intern_close_table(table);
if (!table->in_use)
{
table->next->prev=table->prev; /* remove from used chain */
table->prev->next=table->next;
if (table == unused_tables)
{
unused_tables=unused_tables->next;
if (table == unused_tables)
unused_tables=0;
}
check_unused(); // consisty check
}
my_free((gptr) table,MYF(0));
DBUG_VOID_RETURN;
}
void free_io_cache(TABLE *table)
{
DBUG_ENTER("free_io_cache");
if (table->io_cache)
{
close_cached_file(table->io_cache);
my_free((gptr) table->io_cache,MYF(0));
table->io_cache=0;
}
if (table->record_pointers)
{
my_free((gptr) table->record_pointers,MYF(0));
table->record_pointers=0;
}
DBUG_VOID_RETURN;
}
/* Close all tables which aren't in use by any thread */
bool close_cached_tables(THD *thd, bool if_wait_for_refresh,
TABLE_LIST *tables)
{
bool result=0;
DBUG_ENTER("close_cached_tables");
VOID(pthread_mutex_lock(&LOCK_open));
if (!tables)
{
while (unused_tables)
{
#ifdef EXTRA_DEBUG
if (hash_delete(&open_cache,(byte*) unused_tables))
printf("Warning: Couldn't delete open table from hash\n");
#else
VOID(hash_delete(&open_cache,(byte*) unused_tables));
#endif
}
refresh_version++; // Force close of open tables
}
else
{
bool found=0;
for (TABLE_LIST *table=tables ; table ; table=table->next)
{
if (remove_table_from_cache(thd, table->db, table->real_name, 1))
found=1;
}
if (!found)
if_wait_for_refresh=0; // Nothing to wait for
}
if (!tables)
kill_delayed_threads();
if (if_wait_for_refresh)
{
/*
If there is any table that has a lower refresh_version, wait until
this is closed (or this thread is killed) before returning
*/
thd->mysys_var->current_mutex= &LOCK_open;
thd->mysys_var->current_cond= &COND_refresh;
thd->proc_info="Flushing tables";
close_old_data_files(thd,thd->open_tables,1,1);
mysql_ha_close_list(thd, tables);
bool found=1;
/* Wait until all threads has closed all the tables we had locked */
DBUG_PRINT("info", ("Waiting for others threads to close their open tables"));
while (found && ! thd->killed)
{
found=0;
for (uint idx=0 ; idx < open_cache.records ; idx++)
{
TABLE *table=(TABLE*) hash_element(&open_cache,idx);
if ((table->version) < refresh_version && table->db_stat)
{
found=1;
pthread_cond_wait(&COND_refresh,&LOCK_open);
break;
}
}
}
/*
No other thread has the locked tables open; reopen them and get the
old locks. This should always succeed (unless some external process
has removed the tables)
*/
thd->in_lock_tables=1;
result=reopen_tables(thd,1,1);
thd->in_lock_tables=0;
/* Set version for table */
for (TABLE *table=thd->open_tables; table ; table=table->next)
table->version=refresh_version;
}
VOID(pthread_mutex_unlock(&LOCK_open));
if (if_wait_for_refresh)
{
THD *thd=current_thd;
pthread_mutex_lock(&thd->mysys_var->mutex);
thd->mysys_var->current_mutex= 0;
thd->mysys_var->current_cond= 0;
thd->proc_info=0;
pthread_mutex_unlock(&thd->mysys_var->mutex);
}
DBUG_RETURN(result);
}
/* Put all tables used by thread in free list */
void close_thread_tables(THD *thd, bool locked)
{
DBUG_ENTER("close_thread_tables");
if (thd->locked_tables)
{
ha_commit_stmt(thd); // If select statement
DBUG_VOID_RETURN; // LOCK TABLES in use
}
bool found_old_table=0;
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock); thd->lock=0;
}
/* VOID(pthread_sigmask(SIG_SETMASK,&thd->block_signals,NULL)); */
if (!locked)
VOID(pthread_mutex_lock(&LOCK_open));
safe_mutex_assert_owner(&LOCK_open);
DBUG_PRINT("info", ("thd->open_tables=%p", thd->open_tables));
while (thd->open_tables)
found_old_table|=close_thread_table(thd, &thd->open_tables);
thd->some_tables_deleted=0;
/* Free tables to hold down open files */
while (open_cache.records > table_cache_size && unused_tables)
VOID(hash_delete(&open_cache,(byte*) unused_tables)); /* purecov: tested */
check_unused();
if (found_old_table)
{
/* Tell threads waiting for refresh that something has happened */
VOID(pthread_cond_broadcast(&COND_refresh));
}
if (!locked)
VOID(pthread_mutex_unlock(&LOCK_open));
/* VOID(pthread_sigmask(SIG_SETMASK,&thd->signals,NULL)); */
DBUG_VOID_RETURN;
}
/* move one table to free list */
bool close_thread_table(THD *thd, TABLE **table_ptr)
{
DBUG_ENTER("close_thread_table");
bool found_old_table= 0;
TABLE *table= *table_ptr;
DBUG_ASSERT(table->key_read == 0);
*table_ptr=table->next;
if (table->version != refresh_version ||
thd->version != refresh_version || !table->db_stat)
{
VOID(hash_delete(&open_cache,(byte*) table));
found_old_table=1;
}
else
{
if (table->flush_version != flush_version)
{
table->flush_version=flush_version;
table->file->extra(HA_EXTRA_FLUSH);
}
else
{
// Free memory and reset for next loop
table->file->extra(HA_EXTRA_RESET);
}
table->in_use=0;
if (unused_tables)
{
table->next=unused_tables; /* Link in last */
table->prev=unused_tables->prev;
unused_tables->prev=table;
table->prev->next=table;
}
else
unused_tables=table->next=table->prev=table;
}
DBUG_RETURN(found_old_table);
}
/* Close and delete temporary tables */
void close_temporary(TABLE *table,bool delete_table)
{
DBUG_ENTER("close_temporary");
char path[FN_REFLEN];
db_type table_type=table->db_type;
strmov(path,table->path);
free_io_cache(table);
closefrm(table);
my_free((char*) table,MYF(0));
if (delete_table)
rm_temporary_table(table_type, path);
DBUG_VOID_RETURN;
}
void close_temporary_tables(THD *thd)
{
TABLE *table,*next;
char *query, *end;
uint query_buf_size;
bool found_user_tables = 0;
if (!thd->temporary_tables)
return;
LINT_INIT(end);
query_buf_size= 50; // Enough for DROP ... TABLE IF EXISTS
for (table=thd->temporary_tables ; table ; table=table->next)
/*
We are going to add 4 ` around the db/table names, so 1 does not look
enough; indeed it is enough, because table->key_length is greater (by 8,
because of server_id and thread_id) than db||table.
*/
query_buf_size+= table->key_length+1;
if ((query = alloc_root(&thd->mem_root, query_buf_size)))
// Better add "if exists", in case a RESET MASTER has been done
end=strmov(query, "DROP /*!40005 TEMPORARY */ TABLE IF EXISTS ");
for (table=thd->temporary_tables ; table ; table=next)
{
if (query) // we might be out of memory, but this is not fatal
{
// skip temporary tables not created directly by the user
if (table->real_name[0] != '#')
found_user_tables = 1;
/*
Here we assume table_cache_key always starts
with \0 terminated db name
*/
end = strxmov(end,"`",table->table_cache_key,"`.`",
table->real_name,"`,", NullS);
}
next=table->next;
close_temporary(table);
}
if (query && found_user_tables && mysql_bin_log.is_open())
{
/* The -1 is to remove last ',' */
thd->clear_error();
Query_log_event qinfo(thd, query, (ulong)(end-query)-1, 0);
/*
Imagine the thread had created a temp table, then was doing a SELECT, and
the SELECT was killed. Then it's not clever to mark the statement above as
"killed", because it's not really a statement updating data, and there
are 99.99% chances it will succeed on slave.
If a real update (one updating a persistent table) was killed on the
master, then this real update will be logged with error_code=killed,
rightfully causing the slave to stop.
*/
qinfo.error_code= 0;
mysql_bin_log.write(&qinfo);
}
thd->temporary_tables=0;
}
TABLE **find_temporary_table(THD *thd, const char *db, const char *table_name)
{
char key[MAX_DBKEY_LENGTH];
uint key_length= (uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
TABLE *table,**prev;
int4store(key+key_length,thd->server_id);
key_length += 4;
int4store(key+key_length,thd->slave_proxy_id);
key_length += 4;
prev= &thd->temporary_tables;
for (table=thd->temporary_tables ; table ; table=table->next)
{
if (table->key_length == key_length &&
!memcmp(table->table_cache_key,key,key_length))
return prev;
prev= &table->next;
}
return 0; // Not a temporary table
}
bool close_temporary_table(THD *thd, const char *db, const char *table_name)
{
TABLE *table,**prev;
if (!(prev=find_temporary_table(thd,db,table_name)))
return 1;
table= *prev;
*prev= table->next;
close_temporary(table);
if (thd->slave_thread)
--slave_open_temp_tables;
return 0;
}
/*
Used by ALTER TABLE when the table is a temporary one. It changes something
only if the ALTER contained a RENAME clause (otherwise, table_name is the old
name).
Prepares a table cache key, which is the concatenation of db, table_name and
thd->slave_proxy_id, separated by '\0'.
*/
bool rename_temporary_table(THD* thd, TABLE *table, const char *db,
const char *table_name)
{
char *key;
if (!(key=(char*) alloc_root(&table->mem_root,
(uint) strlen(db)+
(uint) strlen(table_name)+6+4)))
return 1; /* purecov: inspected */
table->key_length=(uint)
(strmov((table->real_name=strmov(table->table_cache_key=key,
db)+1),
table_name) - table->table_cache_key)+1;
int4store(key+table->key_length,thd->server_id);
table->key_length += 4;
int4store(key+table->key_length,thd->slave_proxy_id);
table->key_length += 4;
return 0;
}
/* move table first in unused links */
static void relink_unused(TABLE *table)
{
if (table != unused_tables)
{
table->prev->next=table->next; /* Remove from unused list */
table->next->prev=table->prev;
table->next=unused_tables; /* Link in unused tables */
table->prev=unused_tables->prev;
unused_tables->prev->next=table;
unused_tables->prev=table;
unused_tables=table;
check_unused();
}
}
/*
Remove all instances of table from the current open list
Free all locks on tables that are done with LOCK TABLES
*/
TABLE *unlink_open_table(THD *thd, TABLE *list, TABLE *find)
{
char key[MAX_DBKEY_LENGTH];
uint key_length=find->key_length;
TABLE *start=list,**prev,*next;
prev= &start;
memcpy(key,find->table_cache_key,key_length);
for (; list ; list=next)
{
next=list->next;
if (list->key_length == key_length &&
!memcmp(list->table_cache_key,key,key_length))
{
if (thd->locked_tables)
mysql_lock_remove(thd, thd->locked_tables,list);
VOID(hash_delete(&open_cache,(byte*) list)); // Close table
}
else
{
*prev=list; // put in use list
prev= &list->next;
}
}
*prev=0;
// Notify any 'refresh' threads
pthread_cond_broadcast(&COND_refresh);
return start;
}
/*
When we call the following function we must have a lock on
LOCK_open ; This lock will be unlocked on return.
*/
void wait_for_refresh(THD *thd)
{
safe_mutex_assert_owner(&LOCK_open);
/* Wait until the current table is up to date */
const char *proc_info;
thd->mysys_var->current_mutex= &LOCK_open;
thd->mysys_var->current_cond= &COND_refresh;
proc_info=thd->proc_info;
thd->proc_info="Waiting for table";
if (!thd->killed)
(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
pthread_mutex_unlock(&LOCK_open); // Must be unlocked first
pthread_mutex_lock(&thd->mysys_var->mutex);
thd->mysys_var->current_mutex= 0;
thd->mysys_var->current_cond= 0;
thd->proc_info= proc_info;
pthread_mutex_unlock(&thd->mysys_var->mutex);
}
TABLE *reopen_name_locked_table(THD* thd, TABLE_LIST* table_list)
{
DBUG_ENTER("reopen_name_locked_table");
if (thd->killed)
DBUG_RETURN(0);
TABLE* table;
if (!(table = table_list->table))
DBUG_RETURN(0);
char* db = thd->db ? thd->db : table_list->db;
char* table_name = table_list->real_name;
char key[MAX_DBKEY_LENGTH];
uint key_length;
key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
pthread_mutex_lock(&LOCK_open);
if (open_unireg_entry(thd, table, db, table_name, table_name) ||
!(table->table_cache_key =memdup_root(&table->mem_root,(char*) key,
key_length)))
{
closefrm(table);
pthread_mutex_unlock(&LOCK_open);
DBUG_RETURN(0);
}
table->key_length=key_length;
table->version=0;
table->flush_version=0;
table->in_use = thd;
check_unused();
pthread_mutex_unlock(&LOCK_open);
table->next = thd->open_tables;
thd->open_tables = table;
table->tablenr=thd->current_tablenr++;
table->used_fields=0;
table->const_table=0;
table->outer_join= table->null_row= table->maybe_null= table->force_index= 0;
table->status=STATUS_NO_RECORD;
table->keys_in_use_for_query= table->keys_in_use;
table->used_keys= table->keys_for_keyread;
DBUG_RETURN(table);
}
/******************************************************************************
** open a table
** Uses a cache of open tables to find a table not in use.
** If refresh is a NULL pointer, then the is no version number checking and
** the table is not put in the thread-open-list
** If the return value is NULL and refresh is set then one must close
** all tables and retry the open
******************************************************************************/
TABLE *open_table(THD *thd,const char *db,const char *table_name,
const char *alias,bool *refresh)
{
reg1 TABLE *table;
char key[MAX_DBKEY_LENGTH];
uint key_length;
DBUG_ENTER("open_table");
/* find a unused table in the open table cache */
if (refresh)
*refresh=0;
if (thd->killed)
DBUG_RETURN(0);
key_length= (uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
int4store(key + key_length, thd->server_id);
int4store(key + key_length + 4, thd->slave_proxy_id);
for (table=thd->temporary_tables; table ; table=table->next)
{
if (table->key_length == key_length+8 &&
!memcmp(table->table_cache_key,key,key_length+8))
{
if (table->query_id == thd->query_id)
{
my_printf_error(ER_CANT_REOPEN_TABLE,
ER(ER_CANT_REOPEN_TABLE),MYF(0),table->table_name);
DBUG_RETURN(0);
}
table->query_id=thd->query_id;
goto reset;
}
}
if (thd->locked_tables)
{ // Using table locks
for (table=thd->open_tables; table ; table=table->next)
{
if (table->key_length == key_length &&
!memcmp(table->table_cache_key,key,key_length) &&
!my_strcasecmp(table->table_name,alias) &&
table->query_id != thd->query_id)
{
table->query_id=thd->query_id;
goto reset;
}
}
my_printf_error(ER_TABLE_NOT_LOCKED,ER(ER_TABLE_NOT_LOCKED),MYF(0),alias);
DBUG_RETURN(0);
}
VOID(pthread_mutex_lock(&LOCK_open));
if (!thd->open_tables)
thd->version=refresh_version;
else if (thd->version != refresh_version && refresh)
{
/* Someone did a refresh while thread was opening tables */
*refresh=1;
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(0);
}
/* close handler tables which are marked for flush */
mysql_ha_close_list(thd, (TABLE_LIST*) NULL, /*flushed*/ 1);
for (table=(TABLE*) hash_search(&open_cache,(byte*) key,key_length) ;
table && table->in_use ;
table = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
{
if (table->version != refresh_version)
{
/*
** There is a refresh in progress for this table
** Wait until the table is freed or the thread is killed.
*/
close_old_data_files(thd,thd->open_tables,0,0);
if (table->in_use != thd)
wait_for_refresh(thd);
else
VOID(pthread_mutex_unlock(&LOCK_open));
if (refresh)
*refresh=1;
DBUG_RETURN(0);
}
}
if (table)
{
if (table == unused_tables)
{ // First unused
unused_tables=unused_tables->next; // Remove from link
if (table == unused_tables)
unused_tables=0;
}
table->prev->next=table->next; /* Remove from unused list */
table->next->prev=table->prev;
}
else
{
/* Free cache if too big */
while (open_cache.records > table_cache_size && unused_tables)
VOID(hash_delete(&open_cache,(byte*) unused_tables)); /* purecov: tested */
/* make a new table */
if (!(table=(TABLE*) my_malloc(sizeof(*table),MYF(MY_WME))))
{
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(NULL);
}
if (open_unireg_entry(thd, table,db,table_name,alias) ||
!(table->table_cache_key=memdup_root(&table->mem_root,(char*) key,
key_length)))
{
table->next=table->prev=table;
free_cache_entry(table);
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(NULL);
}
table->key_length=key_length;
table->version=refresh_version;
table->flush_version=flush_version;
DBUG_PRINT("info", ("inserting table %p into the cache", table));
VOID(hash_insert(&open_cache,(byte*) table));
}
table->in_use=thd;
check_unused();
VOID(pthread_mutex_unlock(&LOCK_open));
if (refresh)
{
table->next=thd->open_tables; /* Link into simple list */
thd->open_tables=table;
}
table->reginfo.lock_type=TL_READ; /* Assume read */
reset:
/* Fix alias if table name changes */
if (strcmp(table->table_name,alias))
{
uint length=(uint) strlen(alias)+1;
table->table_name= (char*) my_realloc(table->table_name,length,
MYF(MY_WME));
memcpy(table->table_name,alias,length);
for (uint i=0 ; i < table->fields ; i++)
table->field[i]->table_name=table->table_name;
}
#if MYSQL_VERSION_ID < 40100
/*
If per-connection "new" variable (represented by variables.new_mode)
is set then we should pretend that the length of TIMESTAMP field is 19.
The cheapest (from perfomance viewpoint) way to achieve that is to set
field_length of all Field_timestamp objects in a table after opening
it (to 19 if new_mode is true or to original field length otherwise).
We save value of new_mode variable in TABLE::timestamp_mode to
not perform this setup if new_mode value is the same between sequential
table opens.
*/
my_bool new_mode= thd->variables.new_mode;
if (table->timestamp_mode != new_mode)
{
for (uint i=0 ; i < table->fields ; i++)
{
Field *field= table->field[i];
if (field->type() == FIELD_TYPE_TIMESTAMP)
field->field_length= new_mode ? 19 :
((Field_timestamp *)(field))->orig_field_length;
}
table->timestamp_mode= new_mode;
}
#endif
/* These variables are also set in reopen_table() */
table->tablenr=thd->current_tablenr++;
table->used_fields=0;
table->const_table=0;
table->outer_join= table->null_row= table->maybe_null= table->force_index= 0;
table->status=STATUS_NO_RECORD;
table->keys_in_use_for_query= table->keys_in_use;
table->used_keys= table->keys_for_keyread;
DBUG_ASSERT(table->key_read == 0);
DBUG_RETURN(table);
}
TABLE *find_locked_table(THD *thd, const char *db,const char *table_name)
{
char key[MAX_DBKEY_LENGTH];
uint key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
for (TABLE *table=thd->open_tables; table ; table=table->next)
{
if (table->key_length == key_length &&
!memcmp(table->table_cache_key,key,key_length))
return table;
}
return(0);
}
/****************************************************************************
** Reopen an table because the definition has changed. The date file for the
** table is already closed.
** Returns 0 if ok.
** If table can't be reopened, the entry is unchanged.
****************************************************************************/
bool reopen_table(TABLE *table,bool locked)
{
TABLE tmp;
char *db=table->table_cache_key;
char *table_name=table->real_name;
bool error=1;
Field **field;
uint key,part;
DBUG_ENTER("reopen_table");
#ifdef EXTRA_DEBUG
if (table->db_stat)
sql_print_error("Table %s had a open data handler in reopen_table",
table->table_name);
#endif
if (!locked)
VOID(pthread_mutex_lock(&LOCK_open));
safe_mutex_assert_owner(&LOCK_open);
if (open_unireg_entry(current_thd,&tmp,db,table_name,table->table_name))
goto end;
free_io_cache(table);
if (!(tmp.table_cache_key= memdup_root(&tmp.mem_root,db,
table->key_length)))
{
closefrm(&tmp); // End of memory
goto end;
}
/* This list copies variables set by open_table */
tmp.tablenr= table->tablenr;
tmp.used_fields= table->used_fields;
tmp.const_table= table->const_table;
tmp.outer_join= table->outer_join;
tmp.null_row= table->null_row;
tmp.maybe_null= table->maybe_null;
tmp.status= table->status;
tmp.keys_in_use_for_query= tmp.keys_in_use;
tmp.used_keys= tmp.keys_for_keyread;
tmp.force_index= tmp.force_index;
/* Get state */
tmp.key_length= table->key_length;
tmp.in_use= table->in_use;
tmp.reginfo.lock_type=table->reginfo.lock_type;
tmp.version= refresh_version;
tmp.tmp_table= table->tmp_table;
tmp.grant= table->grant;
/* Replace table in open list */
tmp.next=table->next;
tmp.prev=table->prev;
if (table->file)
VOID(closefrm(table)); // close file, free everything
*table=tmp;
table->file->change_table_ptr(table);
for (field=table->field ; *field ; field++)
{
(*field)->table=table;
(*field)->table_name=table->table_name;
}
for (key=0 ; key < table->keys ; key++)
for (part=0 ; part < table->key_info[key].usable_key_parts ; part++)
table->key_info[key].key_part[part].field->table=table;
VOID(pthread_cond_broadcast(&COND_refresh));
error=0;
end:
if (!locked)
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(error);
}
/*
Used with ALTER TABLE:
Close all instanses of table when LOCK TABLES is in used;
Close first all instances of table and then reopen them
*/
bool close_data_tables(THD *thd,const char *db, const char *table_name)
{
TABLE *table;
for (table=thd->open_tables; table ; table=table->next)
{
if (!strcmp(table->real_name,table_name) &&
!strcmp(table->table_cache_key,db))
{
mysql_lock_remove(thd, thd->locked_tables,table);
table->file->close();
table->db_stat=0;
}
}
return 0; // For the future
}
/*
Reopen all tables with closed data files
One should have lock on LOCK_open when calling this
*/
bool reopen_tables(THD *thd,bool get_locks,bool in_refresh)
{
DBUG_ENTER("reopen_tables");
safe_mutex_assert_owner(&LOCK_open);
if (!thd->open_tables)
DBUG_RETURN(0);
TABLE *table,*next,**prev;
TABLE **tables,**tables_ptr; // For locks
bool error=0;
if (get_locks)
{
/* The ptr is checked later */
uint opens=0;
for (table=thd->open_tables; table ; table=table->next) opens++;
tables= (TABLE**) my_alloca(sizeof(TABLE*)*opens);
}
else
tables= &thd->open_tables;
tables_ptr =tables;
prev= &thd->open_tables;
for (table=thd->open_tables; table ; table=next)
{
uint db_stat=table->db_stat;
next=table->next;
if (!tables || (!db_stat && reopen_table(table,1)))
{
my_error(ER_CANT_REOPEN_TABLE,MYF(0),table->table_name);
VOID(hash_delete(&open_cache,(byte*) table));
error=1;
}
else
{
*prev= table;
prev= &table->next;
if (get_locks && !db_stat)
*tables_ptr++= table; // need new lock on this
if (in_refresh)
{
table->version=0;
table->locked_by_flush=0;
}
}
}
if (tables != tables_ptr) // Should we get back old locks
{
MYSQL_LOCK *lock;
/* We should always get these locks */
thd->some_tables_deleted=0;
if ((lock=mysql_lock_tables(thd,tables,(uint) (tables_ptr-tables))))
{
thd->locked_tables=mysql_lock_merge(thd->locked_tables,lock);
}
else
error=1;
}
if (get_locks && tables)
{
my_afree((gptr) tables);
}
VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
*prev=0;
DBUG_RETURN(error);
}
/*
Close handlers for tables in list, but leave the TABLE structure
intact so that we can re-open these quickly
abort_locks is set if called from flush_tables.
*/
void close_old_data_files(THD *thd, TABLE *table, bool abort_locks,
bool send_refresh)
{
DBUG_ENTER("close_old_data_files");
bool found=send_refresh;
for (; table ; table=table->next)
{
if (table->version != refresh_version)
{
found=1;
if (!abort_locks) // If not from flush tables
table->version = refresh_version; // Let other threads use table
if (table->db_stat)
{
if (abort_locks)
{
mysql_lock_abort(thd,table); // Close waiting threads
mysql_lock_remove(thd, thd->locked_tables,table);
table->locked_by_flush=1; // Will be reopened with locks
}
table->file->close();
table->db_stat=0;
}
}
}
if (found)
VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
DBUG_VOID_RETURN;
}
/*
Wait until all threads has closed the tables in the list
We have also to wait if there is thread that has a lock on this table even
if the table is closed
*/
bool table_is_used(TABLE *table, bool wait_for_name_lock)
{
do
{
char *key= table->table_cache_key;
uint key_length=table->key_length;
for (TABLE *search=(TABLE*) hash_search(&open_cache,
(byte*) key,key_length) ;
search ;
search = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
{
if (search->locked_by_flush ||
search->locked_by_name && wait_for_name_lock ||
search->db_stat && search->version < refresh_version)
return 1; // Table is used
}
} while ((table=table->next));
return 0;
}
/* Wait until all used tables are refreshed */
bool wait_for_tables(THD *thd)
{
bool result;
DBUG_ENTER("wait_for_tables");
thd->proc_info="Waiting for tables";
pthread_mutex_lock(&LOCK_open);
while (!thd->killed)
{
thd->some_tables_deleted=0;
close_old_data_files(thd,thd->open_tables,0,dropping_tables != 0);
mysql_ha_close_list(thd, (TABLE_LIST*) NULL, /*flushed*/ 1);
if (!table_is_used(thd->open_tables,1))
break;
(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
}
if (thd->killed)
result= 1; // aborted
else
{
/* Now we can open all tables without any interference */
thd->proc_info="Reopen tables";
result=reopen_tables(thd,0,0);
}
pthread_mutex_unlock(&LOCK_open);
thd->proc_info=0;
DBUG_RETURN(result);
}
/* drop tables from locked list */
bool drop_locked_tables(THD *thd,const char *db, const char *table_name)
{
TABLE *table,*next,**prev;
bool found=0;
prev= &thd->open_tables;
for (table=thd->open_tables; table ; table=next)
{
next=table->next;
if (!strcmp(table->real_name,table_name) &&
!strcmp(table->table_cache_key,db))
{
mysql_lock_remove(thd, thd->locked_tables,table);
VOID(hash_delete(&open_cache,(byte*) table));
found=1;
}
else
{
*prev=table;
prev= &table->next;
}
}
*prev=0;
if (found)
VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
if (thd->locked_tables && thd->locked_tables->table_count == 0)
{
my_free((gptr) thd->locked_tables,MYF(0));
thd->locked_tables=0;
}
return found;
}
/*
If we have the table open, which only happens when a LOCK TABLE has been
done on the table, change the lock type to a lock that will abort all
other threads trying to get the lock.
*/
void abort_locked_tables(THD *thd,const char *db, const char *table_name)
{
TABLE *table;
for (table= thd->open_tables; table ; table= table->next)
{
if (!strcmp(table->real_name,table_name) &&
!strcmp(table->table_cache_key,db))
{
mysql_lock_abort(thd,table);
break;
}
}
}
/*
Load a table definition from file and open unireg table
SYNOPSIS
open_unireg_entry()
thd Thread handle
entry Store open table definition here
db Database name
name Table name
alias Alias name
NOTES
Extra argument for open is taken from thd->open_options
RETURN
0 ok
# Error
*/
static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
const char *name, const char *alias)
{
char path[FN_REFLEN];
int error;
DBUG_ENTER("open_unireg_entry");
strxmov(path, mysql_data_home, "/", db, "/", name, NullS);
if (openfrm(path,alias,
(uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX |
HA_TRY_READ_ONLY),
READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
thd->open_options, entry))
{
if (!entry->crashed)
goto err; // Can't repair the table
TABLE_LIST table_list;
table_list.db=(char*) db;
table_list.real_name=(char*) name;
table_list.next=0;
safe_mutex_assert_owner(&LOCK_open);
if ((error=lock_table_name(thd,&table_list)))
{
if (error < 0)
{
goto err;
}
if (wait_for_locked_table_names(thd,&table_list))
{
unlock_table_name(thd,&table_list);
goto err;
}
}
pthread_mutex_unlock(&LOCK_open);
thd->clear_error();
error=0;
if (openfrm(path,alias,
(uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX |
HA_TRY_READ_ONLY),
READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
ha_open_options | HA_OPEN_FOR_REPAIR,
entry) || ! entry->file ||
(entry->file->is_crashed() && entry->file->check_and_repair(thd)))
{
/* Give right error message */
thd->clear_error();
my_error(ER_NOT_KEYFILE, MYF(0), name, my_errno);
sql_print_error("Error: Couldn't repair table: %s.%s",db,name);
if (entry->file)
closefrm(entry);
error=1;
}
else
thd->clear_error();
pthread_mutex_lock(&LOCK_open);
unlock_table_name(thd,&table_list);
if (error)
goto err;
}
/*
If we are here, there was no fatal error (but error may be still
unitialized).
*/
if (unlikely(entry->file->implicit_emptied))
{
entry->file->implicit_emptied= 0;
if (mysql_bin_log.is_open())
{
char *query, *end;
uint query_buf_size= 20 + 2*NAME_LEN + 1;
if ((query= (char*)my_malloc(query_buf_size,MYF(MY_WME))))
{
end = strxmov(strmov(query, "DELETE FROM `"),
db,"`.`",name,"`", NullS);
Query_log_event qinfo(thd, query, (ulong)(end-query), 0);
mysql_bin_log.write(&qinfo);
my_free(query, MYF(0));
}
else
{
/*
As replication is maybe going to be corrupted, we need to warn the
DBA on top of warning the client (which will automatically be done
because of MYF(MY_WME) in my_malloc() above).
*/
sql_print_error("Error: when opening HEAP table, could not allocate \
memory to write 'DELETE FROM `%s`.`%s`' to the binary log",db,name);
if (entry->file)
closefrm(entry);
goto err;
}
}
}
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
}
/*****************************************************************************
** open all tables in list
*****************************************************************************/
int open_tables(THD *thd,TABLE_LIST *start)
{
TABLE_LIST *tables;
bool refresh;
int result=0;
DBUG_ENTER("open_tables");
restart:
thd->proc_info="Opening tables";
for (tables=start ; tables ; tables=tables->next)
{
if (!tables->table &&
!(tables->table=open_table(thd,
tables->db,
tables->real_name,
tables->alias, &refresh)))
{
if (refresh) // Refresh in progress
{
/* close all 'old' tables used by this thread */
pthread_mutex_lock(&LOCK_open);
// if query_id is not reset, we will get an error
// re-opening a temp table
thd->version=refresh_version;
TABLE **prev_table= &thd->open_tables;
bool found=0;
for (TABLE_LIST *tmp=start ; tmp ; tmp=tmp->next)
{
/* Close normal (not temporary) changed tables */
if (tmp->table && ! tmp->table->tmp_table)
{
if (tmp->table->version != refresh_version ||
! tmp->table->db_stat)
{
VOID(hash_delete(&open_cache,(byte*) tmp->table));
tmp->table=0;
found=1;
}
else
{
*prev_table= tmp->table; // Relink open list
prev_table= &tmp->table->next;
}
}
}
*prev_table=0;
pthread_mutex_unlock(&LOCK_open);
if (found)
VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
goto restart;
}
result= -1; // Fatal error
break;
}
if (tables->lock_type != TL_UNLOCK && ! thd->locked_tables)
tables->table->reginfo.lock_type=tables->lock_type;
tables->table->grant= tables->grant;
}
thd->proc_info=0;
DBUG_RETURN(result);
}
/*
Check that lock is ok for tables; Call start stmt if ok
SYNOPSIS
check_lock_and_start_stmt()
thd Thread handle
table_list Table to check
lock_type Lock used for table
RETURN VALUES
0 ok
1 error
*/
static bool check_lock_and_start_stmt(THD *thd, TABLE *table,
thr_lock_type lock_type)
{
int error;
DBUG_ENTER("check_lock_and_start_stmt");
if ((int) lock_type >= (int) TL_WRITE_ALLOW_READ &&
(int) table->reginfo.lock_type < (int) TL_WRITE_ALLOW_READ)
{
my_printf_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,
ER(ER_TABLE_NOT_LOCKED_FOR_WRITE),
MYF(0),table->table_name);
DBUG_RETURN(1);
}
if ((error=table->file->start_stmt(thd)))
{
table->file->print_error(error,MYF(0));
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
/*
Open and lock one table
SYNOPSIS
open_ltable()
thd Thread handler
table_list Table to open is first table in this list
lock_type Lock to use for open
RETURN VALUES
table Opened table
0 Error
If ok, the following are also set:
table_list->lock_type lock_type
table_list->table table
*/
TABLE *open_ltable(THD *thd, TABLE_LIST *table_list, thr_lock_type lock_type)
{
TABLE *table;
bool refresh;
DBUG_ENTER("open_ltable");
thd->proc_info="Opening table";
while (!(table=open_table(thd,table_list->db,
table_list->real_name,table_list->alias,
&refresh)) && refresh) ;
if (table)
{
#if defined( __WIN__) || defined(OS2)
/* Win32 can't drop a file that is open */
if (lock_type == TL_WRITE_ALLOW_READ)
{
lock_type= TL_WRITE;
}
#endif /* __WIN__ || OS2 */
table_list->lock_type= lock_type;
table_list->table= table;
table->grant= table_list->grant;
if (thd->locked_tables)
{
if (check_lock_and_start_stmt(thd, table, lock_type))
table= 0;
}
else
{
if ((table->reginfo.lock_type= lock_type) != TL_UNLOCK)
if (!(thd->lock=mysql_lock_tables(thd,&table_list->table,1)))
table= 0;
}
}
thd->proc_info=0;
DBUG_RETURN(table);
}
/*
Open all tables in list and locks them for read.
The lock will automaticly be freed by close_thread_tables()
*/
int open_and_lock_tables(THD *thd,TABLE_LIST *tables)
{
if (open_tables(thd,tables) || lock_tables(thd,tables))
return -1; /* purecov: inspected */
return 0;
}
/*
Lock all tables in list
SYNOPSIS
lock_tables()
thd Thread handler
tables Tables to lock
RETURN VALUES
0 ok
-1 Error
*/
int lock_tables(THD *thd,TABLE_LIST *tables)
{
TABLE_LIST *table;
if (!tables)
return 0;
if (!thd->locked_tables)
{
uint count=0;
for (table = tables ; table ; table=table->next)
count++;
TABLE **start,**ptr;
if (!(ptr=start=(TABLE**) sql_alloc(sizeof(TABLE*)*count)))
return -1;
for (table = tables ; table ; table=table->next)
*(ptr++)= table->table;
if (!(thd->lock=mysql_lock_tables(thd,start,count)))
return -1; /* purecov: inspected */
}
else
{
for (table = tables ; table ; table=table->next)
{
if (check_lock_and_start_stmt(thd, table->table, table->lock_type))
{
ha_rollback_stmt(thd);
return -1;
}
}
}
return 0;
}
/*
Open a single table without table caching and don't set it in open_list
Used by alter_table to open a temporary table and when creating
a temporary table with CREATE TEMPORARY ...
*/
TABLE *open_temporary_table(THD *thd, const char *path, const char *db,
const char *table_name, bool link_in_list)
{
TABLE *tmp_table;
DBUG_ENTER("open_temporary_table");
/*
The extra size in my_malloc() is for table_cache_key
4 bytes for master thread id if we are in the slave
1 byte to terminate db
1 byte to terminate table_name
total of 6 extra bytes in my_malloc in addition to table/db stuff
*/
if (!(tmp_table=(TABLE*) my_malloc(sizeof(*tmp_table)+(uint) strlen(db)+
(uint) strlen(table_name)+6+4,
MYF(MY_WME))))
DBUG_RETURN(0); /* purecov: inspected */
if (openfrm(path, table_name,
(uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX),
READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
ha_open_options,
tmp_table))
{
my_free((char*) tmp_table,MYF(0));
DBUG_RETURN(0);
}
tmp_table->reginfo.lock_type=TL_WRITE; // Simulate locked
tmp_table->tmp_table = (tmp_table->file->has_transactions() ?
TRANSACTIONAL_TMP_TABLE : TMP_TABLE);
tmp_table->table_cache_key=(char*) (tmp_table+1);
tmp_table->key_length= (uint) (strmov((tmp_table->real_name=
strmov(tmp_table->table_cache_key,db)
+1), table_name)
- tmp_table->table_cache_key)+1;
int4store(tmp_table->table_cache_key + tmp_table->key_length,
thd->server_id);
tmp_table->key_length += 4;
int4store(tmp_table->table_cache_key + tmp_table->key_length,
thd->slave_proxy_id);
tmp_table->key_length += 4;
if (link_in_list)
{
tmp_table->next=thd->temporary_tables;
thd->temporary_tables=tmp_table;
if (thd->slave_thread)
slave_open_temp_tables++;
}
DBUG_RETURN(tmp_table);
}
bool rm_temporary_table(enum db_type base, char *path)
{
bool error=0;
fn_format(path, path,"",reg_ext,4);
unpack_filename(path,path);
if (my_delete(path,MYF(0)))
error=1; /* purecov: inspected */
*fn_ext(path)='\0'; // remove extension
handler *file=get_new_handler((TABLE*) 0, base);
if (file && file->delete_table(path))
{
error=1;
sql_print_error("Warning: Could not remove tmp table: '%s', error: %d",
path, my_errno);
}
delete file;
return error;
}
/*****************************************************************************
** find field in list or tables. if field is unqualifed and unique,
** return unique field
******************************************************************************/
#define WRONG_GRANT (Field*) -1
Field *find_field_in_table(THD *thd,TABLE *table,const char *name,uint length,
bool check_grants, bool allow_rowid)
{
Field *field;
if (table->name_hash.records)
{
if ((field=(Field*) hash_search(&table->name_hash,(byte*) name,
length)))
goto found;
}
else
{
Field **ptr=table->field;
while ((field = *ptr++))
{
if (!my_strcasecmp(field->field_name, name))
goto found;
}
}
if (allow_rowid && !my_strcasecmp(name,"_rowid") &&
(field=table->rowid_field))
goto found;
return (Field*) 0;
found:
if (thd->set_query_id)
{
if (field->query_id != thd->query_id)
{
field->query_id=thd->query_id;
table->used_fields++;
table->used_keys&= field->part_of_key;
}
else
thd->dupp_field=field;
}
if (check_grants && check_grant_column(thd,table,name,length))
return WRONG_GRANT;
return field;
}
Field *
find_field_in_tables(THD *thd,Item_field *item,TABLE_LIST *tables)
{
Field *found=0;
const char *db=item->db_name;
const char *table_name=item->table_name;
const char *name=item->field_name;
uint length=(uint) strlen(name);
char name_buff[NAME_LEN+1];
if (db && lower_case_table_names)
{
/*
convert database to lower case for comparision.
We can't do this in Item_field as this would change the
'name' of the item which may be used in the select list
*/
strmake(name_buff, db, sizeof(name_buff)-1);
casedn_str(name_buff);
db= name_buff;
}
if (table_name)
{ /* Qualified field */
bool found_table=0;
for (; tables ; tables=tables->next)
{
if (!strcmp(tables->alias,table_name) &&
(!db || !strcmp(db,tables->db)))
{
found_table=1;
Field *find=find_field_in_table(thd,tables->table,name,length,
test(tables->table->grant.
want_privilege),
1);
if (find)
{
if (find == WRONG_GRANT)
return (Field*) 0;
if (db || !thd->where)
return find;
if (found)
{
my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
item->full_name(),thd->where);
return (Field*) 0;
}
found=find;
}
}
}
if (found)
return found;
if (!found_table)
{
char buff[NAME_LEN*2+1];
if (db)
{
strxnmov(buff,sizeof(buff)-1,db,".",table_name,NullS);
table_name=buff;
}
my_printf_error(ER_UNKNOWN_TABLE,ER(ER_UNKNOWN_TABLE),MYF(0),table_name,
thd->where);
}
else
my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
item->full_name(),thd->where);
return (Field*) 0;
}
bool allow_rowid= tables && !tables->next; // Only one table
for (; tables ; tables=tables->next)
{
Field *field=find_field_in_table(thd,tables->table,name,length,
test(tables->table->grant.want_privilege),
allow_rowid);
if (field)
{
if (field == WRONG_GRANT)
return (Field*) 0;
if (found)
{
if (!thd->where) // Returns first found
break;
my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
name,thd->where);
return (Field*) 0;
}
found=field;
}
}
if (found)
return found;
my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),
MYF(0),item->full_name(),thd->where);
return (Field*) 0;
}
Item **
find_item_in_list(Item *find,List<Item> &items)
{
List_iterator<Item> li(items);
Item **found=0,*item;
const char *field_name=0;
const char *table_name=0;
if (find->type() == Item::FIELD_ITEM || find->type() == Item::REF_ITEM)
{
field_name= ((Item_ident*) find)->field_name;
table_name= ((Item_ident*) find)->table_name;
}
while ((item=li++))
{
if (field_name && item->type() == Item::FIELD_ITEM)
{
if (!my_strcasecmp(((Item_field*) item)->name,field_name))
{
if (!table_name)
{
if (found)
{
if ((*found)->eq(item,0))
continue; // Same field twice (Access?)
if (current_thd->where)
my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
find->full_name(), current_thd->where);
return (Item**) 0;
}
found=li.ref();
}
else if (!strcmp(((Item_field*) item)->table_name,table_name))
{
found=li.ref();
break;
}
}
}
else if (!table_name && (item->eq(find,0) ||
find->name && item->name &&
!my_strcasecmp(item->name,find->name)))
{
found=li.ref();
break;
}
}
if (!found && current_thd->where)
my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
find->full_name(),current_thd->where);
return found;
}
/****************************************************************************
** Check that all given fields exists and fill struct with current data
****************************************************************************/
int setup_fields(THD *thd, TABLE_LIST *tables, List<Item> &fields,
bool set_query_id, List<Item> *sum_func_list,
bool allow_sum_func)
{
reg2 Item *item;
List_iterator<Item> it(fields);
DBUG_ENTER("setup_fields");
thd->set_query_id=set_query_id;
thd->allow_sum_func= allow_sum_func;
thd->where="field list";
while ((item=it++))
{
/*
Expand * to all fields if this is not the temporary table for an
a UNION result
*/
if (item->type() == Item::FIELD_ITEM &&
((Item_field*) item)->field_name[0] == '*' &&
!((Item_field*) item)->field)
{
uint elem=fields.elements;
if (insert_fields(thd,tables,((Item_field*) item)->db_name,
((Item_field*) item)->table_name,&it))
DBUG_RETURN(-1); /* purecov: inspected */
if (sum_func_list)
{
/*
sum_func_list is a list that has the fields list as a tail.
Because of this we have to update the element count also for this
list after expanding the '*' entry.
*/
sum_func_list->elements+= fields.elements - elem;
}
}
else
{
if (item->fix_fields(thd,tables))
DBUG_RETURN(-1); /* purecov: inspected */
if (item->with_sum_func && item->type() != Item::SUM_FUNC_ITEM &&
sum_func_list)
item->split_sum_func(*sum_func_list);
thd->used_tables|=item->used_tables();
}
}
DBUG_RETURN(test(thd->fatal_error));
}
/*
Remap table numbers if INSERT ... SELECT
Check also that the 'used keys' and 'ignored keys' exists and set up the
table structure accordingly
*/
bool setup_tables(TABLE_LIST *tables)
{
DBUG_ENTER("setup_tables");
uint tablenr=0;
for (TABLE_LIST *table_list=tables ; table_list ;
table_list=table_list->next,tablenr++)
{
TABLE *table=table_list->table;
table->used_fields=0;
table->const_table=0;
table->null_row=0;
table->status=STATUS_NO_RECORD;
table->keys_in_use_for_query= table->keys_in_use;
table->used_keys= table->keys_for_keyread;
table->maybe_null=test(table->outer_join= table_list->outer_join);
table->tablenr=tablenr;
table->map= (table_map) 1 << tablenr;
table->force_index= table_list->force_index;
if (table_list->use_index)
{
key_map map= get_key_map_from_key_list(table,
table_list->use_index);
if (map == ~(key_map) 0)
DBUG_RETURN(1);
table->keys_in_use_for_query=map;
}
if (table_list->ignore_index)
{
key_map map= get_key_map_from_key_list(table,
table_list->ignore_index);
if (map == ~(key_map) 0)
DBUG_RETURN(1);
table->keys_in_use_for_query &= ~map;
}
table->used_keys &= table->keys_in_use_for_query;
if (table_list->shared)
{
/* Clear query_id that may have been set by previous select */
for (Field **ptr=table->field ; *ptr ; ptr++)
(*ptr)->query_id=0;
}
}
if (tablenr > MAX_TABLES)
{
my_error(ER_TOO_MANY_TABLES,MYF(0),MAX_TABLES);
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
static key_map get_key_map_from_key_list(TABLE *table,
List<String> *index_list)
{
key_map map=0;
List_iterator_fast<String> it(*index_list);
String *name;
uint pos;
while ((name=it++))
{
if ((pos=find_type(name->c_ptr(), &table->keynames, 1+2)) <= 0)
{
my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), name->c_ptr(),
table->real_name);
return (~ (key_map) 0);
}
map|= ((key_map) 1) << (pos-1);
}
return map;
}
/****************************************************************************
This just drops in all fields instead of current '*' field
Returns pointer to last inserted field if ok
****************************************************************************/
bool
insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
const char *table_name, List_iterator<Item> *it)
{
char name_buff[NAME_LEN+1];
uint found;
DBUG_ENTER("insert_fields");
if (db_name && lower_case_table_names)
{
/*
convert database to lower case for comparison
We can't do this in Item_field as this would change the
'name' of the item which may be used in the select list
*/
strmake(name_buff, db_name, sizeof(name_buff)-1);
casedn_str(name_buff);
db_name= name_buff;
}
found=0;
for (; tables ; tables=tables->next)
{
TABLE *table=tables->table;
if (!table_name || (!strcmp(table_name,tables->alias) &&
(!db_name || !strcmp(tables->db,db_name))))
{
/* Ensure that we have access right to all columns */
if (!(table->grant.privilege & SELECT_ACL) &&
check_grant_all_columns(thd,SELECT_ACL,table))
DBUG_RETURN(-1);
Field **ptr=table->field,*field;
thd->used_tables|=table->map;
while ((field = *ptr++))
{
Item_field *item= new Item_field(field);
if (!found++)
(void) it->replace(item); // Replace '*'
else
it->after(item);
/*
Mark if field used before in this select.
Used by 'insert' to verify if a field name is used twice
*/
if (field->query_id == thd->query_id)
thd->dupp_field=field;
field->query_id=thd->query_id;
table->used_keys&= field->part_of_key;
}
/* All fields are used */
table->used_fields=table->fields;
}
}
if (!found)
{
if (!table_name)
my_error(ER_NO_TABLES_USED,MYF(0));
else
my_error(ER_BAD_TABLE_ERROR,MYF(0),table_name);
}
DBUG_RETURN(!found);
}
/*
** Fix all conditions and outer join expressions
*/
int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
{
table_map not_null_tables= 0;
DBUG_ENTER("setup_conds");
thd->set_query_id=1;
thd->cond_count=0;
thd->allow_sum_func=0;
if (*conds)
{
thd->where="where clause";
if ((*conds)->fix_fields(thd,tables))
DBUG_RETURN(1);
not_null_tables= (*conds)->not_null_tables();
}
/* Check if we are using outer joins */
for (TABLE_LIST *table=tables ; table ; table=table->next)
{
if (table->on_expr)
{
/* Make a join an a expression */
thd->where="on clause";
if (table->on_expr->fix_fields(thd,tables))
DBUG_RETURN(1);
thd->cond_count++;
/*
If it's a normal join or a LEFT JOIN which can be optimized away
add the ON/USING expression to the WHERE
*/
if (!table->outer_join ||
((table->table->map & not_null_tables) &&
!(specialflag & SPECIAL_NO_NEW_FUNC)))
{
table->outer_join= 0;
if (!(*conds=and_conds(*conds, table->on_expr)))
DBUG_RETURN(1);
table->on_expr=0;
}
}
if (table->natural_join)
{
/* Make a join of all fields with have the same name */
TABLE *t1=table->table;
TABLE *t2=table->natural_join->table;
Item_cond_and *cond_and=new Item_cond_and();
if (!cond_and) // If not out of memory
DBUG_RETURN(1);
cond_and->top_level_item();
uint i,j;
for (i=0 ; i < t1->fields ; i++)
{
// TODO: This could be optimized to use hashed names if t2 had a hash
for (j=0 ; j < t2->fields ; j++)
{
if (!my_strcasecmp(t1->field[i]->field_name,
t2->field[j]->field_name))
{
Item_func_eq *tmp=new Item_func_eq(new Item_field(t1->field[i]),
new Item_field(t2->field[j]));
if (!tmp)
DBUG_RETURN(1);
tmp->fix_length_and_dec(); // Update cmp_type
tmp->const_item_cache=0;
/* Mark field used for table cache */
t1->field[i]->query_id=t2->field[j]->query_id=thd->query_id;
cond_and->list.push_back(tmp);
t1->used_keys&= t1->field[i]->part_of_key;
t2->used_keys&= t2->field[j]->part_of_key;
break;
}
}
}
cond_and->used_tables_cache= t1->map | t2->map;
thd->cond_count+=cond_and->list.elements;
if (!table->outer_join) // Not left join
{
if (!(*conds=and_conds(*conds, cond_and)))
DBUG_RETURN(1);
}
else
table->on_expr=and_conds(table->on_expr,cond_and);
}
}
DBUG_RETURN(test(thd->fatal_error));
}
/******************************************************************************
** Fill a record with data (for INSERT or UPDATE)
** Returns : 1 if some field has wrong type
******************************************************************************/
int
fill_record(List<Item> &fields,List<Item> &values, bool ignore_errors)
{
List_iterator_fast<Item> f(fields),v(values);
Item *value;
Item_field *field;
DBUG_ENTER("fill_record");
while ((field=(Item_field*) f++))
{
value=v++;
if (value->save_in_field(field->field, 0) && !ignore_errors)
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
int
fill_record(Field **ptr,List<Item> &values, bool ignore_errors)
{
List_iterator_fast<Item> v(values);
Item *value;
DBUG_ENTER("fill_record");
Field *field;
while ((field = *ptr++))
{
value=v++;
if (value->save_in_field(field, 0) && !ignore_errors)
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
static void mysql_rm_tmp_tables(void)
{
uint idx;
char filePath[FN_REFLEN];
MY_DIR *dirp;
FILEINFO *file;
DBUG_ENTER("mysql_rm_tmp_tables");
/* See if the directory exists */
if (!(dirp = my_dir(mysql_tmpdir,MYF(MY_WME | MY_DONT_SORT))))
DBUG_VOID_RETURN; /* purecov: inspected */
/*
** Remove all SQLxxx tables from directory
*/
for (idx=0 ; idx < (uint) dirp->number_off_files ; idx++)
{
file=dirp->dir_entry+idx;
/* skiping . and .. */
if (file->name[0] == '.' && (!file->name[1] ||
(file->name[1] == '.' && !file->name[2])))
continue;
if (!bcmp(file->name,tmp_file_prefix,tmp_file_prefix_length))
{
sprintf(filePath,"%s%s",mysql_tmpdir,file->name); /* purecov: inspected */
VOID(my_delete(filePath,MYF(MY_WME))); /* purecov: inspected */
}
}
my_dirend(dirp);
DBUG_VOID_RETURN;
}
/*
** CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
** the proper arguments. This isn't very fast but it should work for most
** cases.
** One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/
int mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
{
List<create_field> fields;
List<Alter_drop> drop;
List<Alter_column> alter;
HA_CREATE_INFO create_info;
DBUG_ENTER("mysql_create_index");
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
&create_info, table_list,
fields, keys, drop, alter, (ORDER*)0, FALSE,
DUP_ERROR));
}
int mysql_drop_index(THD *thd, TABLE_LIST *table_list, List<Alter_drop> &drop)
{
List<create_field> fields;
List<Key> keys;
List<Alter_column> alter;
HA_CREATE_INFO create_info;
DBUG_ENTER("mysql_drop_index");
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
&create_info, table_list,
fields, keys, drop, alter, (ORDER*)0, FALSE,
DUP_ERROR));
}
/*****************************************************************************
unireg support functions
*****************************************************************************/
/*
** Invalidate any cache entries that are for some DB
** We can't use hash_delete when looping hash_elements. We mark them first
** and afterwards delete those marked unused.
*/
void remove_db_from_cache(const my_string db)
{
for (uint idx=0 ; idx < open_cache.records ; idx++)
{
TABLE *table=(TABLE*) hash_element(&open_cache,idx);
if (!strcmp(table->table_cache_key,db))
{
table->version=0L; /* Free when thread is ready */
if (!table->in_use)
relink_unused(table);
}
}
while (unused_tables && !unused_tables->version)
VOID(hash_delete(&open_cache,(byte*) unused_tables));
}
/*
** free all unused tables
*/
void flush_tables()
{
(void) pthread_mutex_lock(&LOCK_open);
while (unused_tables)
hash_delete(&open_cache,(byte*) unused_tables);
(void) pthread_mutex_unlock(&LOCK_open);
}
/*
** Mark all entries with the table as deleted to force an reopen of the table
** Returns true if the table is in use by another thread
*/
bool remove_table_from_cache(THD *thd, const char *db, const char *table_name,
bool return_if_owned_by_thd)
{
char key[MAX_DBKEY_LENGTH];
uint key_length;
TABLE *table;
bool result=0;
DBUG_ENTER("remove_table_from_cache");
key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
for (table=(TABLE*) hash_search(&open_cache,(byte*) key,key_length) ;
table;
table = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
{
THD *in_use;
table->version=0L; /* Free when thread is ready */
if (!(in_use=table->in_use))
{
DBUG_PRINT("info",("Table was not in use"));
relink_unused(table);
}
else if (in_use != thd)
{
in_use->some_tables_deleted=1;
if (table->db_stat)
result=1;
/* Kill delayed insert threads */
if ((in_use->system_thread & SYSTEM_THREAD_DELAYED_INSERT) &&
! in_use->killed)
{
in_use->killed=1;
pthread_mutex_lock(&in_use->mysys_var->mutex);
if (in_use->mysys_var->current_cond)
{
pthread_mutex_lock(in_use->mysys_var->current_mutex);
pthread_cond_broadcast(in_use->mysys_var->current_cond);
pthread_mutex_unlock(in_use->mysys_var->current_mutex);
}
pthread_mutex_unlock(&in_use->mysys_var->mutex);
}
/*
Now we must abort all tables locks used by this thread
as the thread may be waiting to get a lock for another table
*/
for (TABLE *thd_table= in_use->open_tables;
thd_table ;
thd_table= thd_table->next)
{
if (thd_table->db_stat) // If table is open
mysql_lock_abort_for_thread(thd, thd_table);
}
}
else
result= result || return_if_owned_by_thd;
}
while (unused_tables && !unused_tables->version)
VOID(hash_delete(&open_cache,(byte*) unused_tables));
DBUG_RETURN(result);
}
int setup_ftfuncs(THD *thd)
{
List_iterator<Item_func_match> li(thd->lex.select->ftfunc_list),
lj(thd->lex.select->ftfunc_list);
Item_func_match *ftf, *ftf2;
while ((ftf=li++))
{
if (ftf->fix_index())
return 1;
lj.rewind();
while ((ftf2=lj++) != ftf)
{
if (ftf->eq(ftf2,1) && !ftf2->master)
ftf2->master=ftf;
}
}
return 0;
}
int init_ftfuncs(THD *thd, bool no_order)
{
if (thd->lex.select->ftfunc_list.elements)
{
List_iterator<Item_func_match> li(thd->lex.select->ftfunc_list);
Item_func_match *ifm;
DBUG_PRINT("info",("Performing FULLTEXT search"));
thd->proc_info="FULLTEXT initialization";
while ((ifm=li++))
ifm->init_search(no_order);
}
return 0;
}
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