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monty@donna.mysql.com
2000-08-21 03:07:54 +03:00
parent d79b0cc9cc
commit 48ee575ebc
4 changed files with 208 additions and 59 deletions
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sql/sql_rename.cc Normal file
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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 */
/*
Atomic rename of table; RENAME TABLE t1 to t2, tmp to t1 [,...]
*/
#include "mysql_priv.h"
static TABLE_LIST *mysql_rename_tables(THD *thd, TABLE_LIST *table_list,
bool skip_error);
/*
Every second entry in the table_list is the original name and every
second entry is the new name.
*/
bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list)
{
bool error=1,got_all_locks=1;
db_type table_type;
TABLE_LIST *lock_table,*ren_table=0,*new_table;
DBUG_ENTER("mysql_rename_tables");
/* Avoid problems with a rename on a table that we have locked or
if the user is trying to to do this in a transcation context */
if (thd->locked_tables || thd->active_transaction())
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION,MYF(0));
DBUG_RETURN(1);
}
VOID(pthread_mutex_lock(&LOCK_open));
for (lock_table=table_list ; lock_table ; lock_table=lock_table->next)
{
int got_lock;
if ((got_lock=lock_table_name(thd,lock_table)) < 0)
goto end;
if (got_lock)
got_all_locks=0;
}
if (!got_all_locks && wait_for_locked_table_names(thd,table_list))
goto end;
if (!(ren_table=mysql_rename_tables(thd,table_list,0)))
error=0;
end:
if (ren_table)
{
/* Rename didn't succeed; rename back the tables in reverse order */
TABLE_LIST *prev=0,*table;
/*
Reverse the table list ; Note that we need to handle the case that
every second entry must stay in place in respect to the previous
*/
while (table_list)
{
TABLE_LIST *next=table_list->next->next;
table_list->next->next=prev;
prev=table_list;
table_list=next;
}
table_list=prev;
/* Find the last renamed table */
for (table=table_list ; table->next != ren_table ;
table=table->next->next) ;
table=table->next->next; // Skipp error table
/* Revert to old names */
mysql_rename_tables(thd, table, 1);
/* Note that lock_table == 0 here, so the unlock loop will work */
}
if (!error)
{
mysql_update_log.write(thd->query,thd->query_length);
Query_log_event qinfo(thd, thd->query);
mysql_bin_log.write(&qinfo);
}
for (TABLE_LIST *table=table_list ; table != lock_table ; table=table->next)
unlock_table_name(thd,table);
pthread_cond_broadcast(&COND_refresh);
pthread_mutex_unlock(&LOCK_open);
DBUG_RETURN(error);
}
/*
Rename all tables in list; Return pointer to wrong entry if something goes
wrong.
*/
static TABLE_LIST *
mysql_rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
{
TABLE_LIST *ren_table;
for (ren_table=table_list ; ren_table ; ren_table=ren_table->next)
{
db_type table_type;
char name[FN_REFLEN];
TABLE_LIST *new_table=ren_table->next;
sprintf(name,"%s/%s/%s%s",mysql_data_home,
ren_table->db,ren_table->name,
reg_ext);
if ((table_type=get_table_type(name)) == DB_TYPE_UNKNOWN ||
mysql_rename_table(table_type,
ren_table->db, ren_table->name,
new_table->db, new_table->name))
{
if (!skip_error)
return ren_table;
}
}
return 0;
}