mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
363 lines
10 KiB
C++
363 lines
10 KiB
C++
/* Copyright (C) 2000-2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Atomic rename of table; RENAME TABLE t1 to t2, tmp to t1 [,...]
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*/
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#include "mysql_priv.h"
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#include "sql_trigger.h"
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static TABLE_LIST *rename_tables(THD *thd, TABLE_LIST *table_list,
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bool skip_error);
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static TABLE_LIST *reverse_table_list(TABLE_LIST *table_list);
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/*
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Every second entry in the table_list is the original name and every
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second entry is the new name.
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*/
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bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list, bool silent)
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{
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bool error= 1;
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TABLE_LIST *ren_table= 0;
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int to_table;
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char *rename_log_table[2]= {NULL, NULL};
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DBUG_ENTER("mysql_rename_tables");
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/*
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Avoid problems with a rename on a table that we have locked or
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if the user is trying to to do this in a transcation context
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*/
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if (thd->locked_tables || thd->active_transaction())
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{
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my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
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ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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DBUG_RETURN(1);
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}
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mysql_ha_rm_tables(thd, table_list, FALSE);
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if (wait_if_global_read_lock(thd,0,1))
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DBUG_RETURN(1);
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if (logger.is_log_table_enabled(QUERY_LOG_GENERAL) ||
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logger.is_log_table_enabled(QUERY_LOG_SLOW))
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{
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/*
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Rules for rename of a log table:
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IF 1. Log tables are enabled
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AND 2. Rename operates on the log table and nothing is being
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renamed to the log table.
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DO 3. Throw an error message.
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ELSE 4. Perform rename.
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*/
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for (to_table= 0, ren_table= table_list; ren_table;
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to_table= 1 - to_table, ren_table= ren_table->next_local)
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{
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int log_table_rename= 0;
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if ((log_table_rename=
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check_if_log_table(ren_table->db_length, ren_table->db,
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ren_table->table_name_length,
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ren_table->table_name, 1)))
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{
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/*
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as we use log_table_rename as an array index, we need it to start
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with 0, while QUERY_LOG_SLOW == 1 and QUERY_LOG_GENERAL == 2.
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So, we shift the value to start with 0;
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*/
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log_table_rename--;
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if (rename_log_table[log_table_rename])
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{
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if (to_table)
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rename_log_table[log_table_rename]= NULL;
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else
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{
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/*
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Two renames of "log_table TO" w/o rename "TO log_table" in
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between.
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*/
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my_error(ER_CANT_RENAME_LOG_TABLE, MYF(0), ren_table->table_name,
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ren_table->table_name);
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DBUG_RETURN(1);
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}
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}
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else
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{
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if (to_table)
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{
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/*
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Attempt to rename a table TO log_table w/o renaming
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log_table TO some table.
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*/
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my_error(ER_CANT_RENAME_LOG_TABLE, MYF(0), ren_table->table_name,
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ren_table->table_name);
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DBUG_RETURN(1);
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}
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else
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{
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/* save the name of the log table to report an error */
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rename_log_table[log_table_rename]= ren_table->table_name;
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}
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}
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}
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}
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if (rename_log_table[0] || rename_log_table[1])
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{
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if (rename_log_table[0])
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my_error(ER_CANT_RENAME_LOG_TABLE, MYF(0), rename_log_table[0],
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rename_log_table[0]);
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else
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my_error(ER_CANT_RENAME_LOG_TABLE, MYF(0), rename_log_table[1],
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rename_log_table[1]);
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DBUG_RETURN(1);
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}
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}
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pthread_mutex_lock(&LOCK_open);
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if (lock_table_names_exclusively(thd, table_list))
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{
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pthread_mutex_unlock(&LOCK_open);
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goto err;
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}
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error=0;
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if ((ren_table=rename_tables(thd,table_list,0)))
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{
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/* Rename didn't succeed; rename back the tables in reverse order */
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TABLE_LIST *table;
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/* Reverse the table list */
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table_list= reverse_table_list(table_list);
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/* Find the last renamed table */
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for (table= table_list;
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table->next_local != ren_table ;
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table= table->next_local->next_local) ;
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table= table->next_local->next_local; // Skip error table
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/* Revert to old names */
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rename_tables(thd, table, 1);
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/* Revert the table list (for prepared statements) */
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table_list= reverse_table_list(table_list);
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error= 1;
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}
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/*
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An exclusive lock on table names is satisfactory to ensure
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no other thread accesses this table.
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However, NDB assumes that handler::rename_tables is called under
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LOCK_open. And it indeed is, from ALTER TABLE.
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TODO: remove this limitation.
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We still should unlock LOCK_open as early as possible, to provide
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higher concurrency - query_cache_invalidate can take minutes to
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complete.
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*/
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pthread_mutex_unlock(&LOCK_open);
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/* Lets hope this doesn't fail as the result will be messy */
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if (!silent && !error)
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{
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write_bin_log(thd, TRUE, thd->query, thd->query_length);
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my_ok(thd);
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}
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if (!error)
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query_cache_invalidate3(thd, table_list, 0);
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pthread_mutex_lock(&LOCK_open);
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unlock_table_names(thd, table_list, (TABLE_LIST*) 0);
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pthread_mutex_unlock(&LOCK_open);
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err:
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start_waiting_global_read_lock(thd);
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DBUG_RETURN(error);
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}
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/*
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reverse table list
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SYNOPSIS
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reverse_table_list()
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table_list pointer to table _list
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RETURN
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pointer to new (reversed) list
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*/
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static TABLE_LIST *reverse_table_list(TABLE_LIST *table_list)
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{
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TABLE_LIST *prev= 0;
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while (table_list)
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{
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TABLE_LIST *next= table_list->next_local;
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table_list->next_local= prev;
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prev= table_list;
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table_list= next;
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}
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return (prev);
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}
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/*
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Rename a single table or a view
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SYNPOSIS
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do_rename()
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thd Thread handle
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ren_table A table/view to be renamed
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new_db The database to which the table to be moved to
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new_table_name The new table/view name
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new_table_alias The new table/view alias
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skip_error Whether to skip error
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DESCRIPTION
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Rename a single table or a view.
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RETURN
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false Ok
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true rename failed
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*/
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bool
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do_rename(THD *thd, TABLE_LIST *ren_table, char *new_db, char *new_table_name,
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char *new_table_alias, bool skip_error)
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{
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int rc= 1;
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char name[FN_REFLEN];
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const char *new_alias, *old_alias;
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frm_type_enum frm_type;
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enum legacy_db_type table_type;
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DBUG_ENTER("do_rename");
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if (lower_case_table_names == 2)
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{
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old_alias= ren_table->alias;
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new_alias= new_table_alias;
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}
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else
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{
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old_alias= ren_table->table_name;
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new_alias= new_table_name;
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}
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build_table_filename(name, sizeof(name),
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new_db, new_alias, reg_ext, 0);
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if (!access(name,F_OK))
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{
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my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_alias);
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DBUG_RETURN(1); // This can't be skipped
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}
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build_table_filename(name, sizeof(name),
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ren_table->db, old_alias, reg_ext, 0);
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frm_type= mysql_frm_type(thd, name, &table_type);
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switch (frm_type)
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{
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case FRMTYPE_TABLE:
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{
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if (!(rc= mysql_rename_table(ha_resolve_by_legacy_type(thd,
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table_type),
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ren_table->db, old_alias,
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new_db, new_alias, 0)))
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{
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if ((rc= Table_triggers_list::change_table_name(thd, ren_table->db,
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old_alias,
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new_db,
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new_alias)))
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{
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/*
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We've succeeded in renaming table's .frm and in updating
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corresponding handler data, but have failed to update table's
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triggers appropriately. So let us revert operations on .frm
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and handler's data and report about failure to rename table.
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*/
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(void) mysql_rename_table(ha_resolve_by_legacy_type(thd,
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table_type),
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new_db, new_alias,
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ren_table->db, old_alias, 0);
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}
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}
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}
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break;
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case FRMTYPE_VIEW:
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/* change of schema is not allowed */
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if (strcmp(ren_table->db, new_db))
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my_error(ER_FORBID_SCHEMA_CHANGE, MYF(0), ren_table->db,
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new_db);
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else
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rc= mysql_rename_view(thd, new_alias, ren_table);
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break;
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default:
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DBUG_ASSERT(0); // should never happen
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case FRMTYPE_ERROR:
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my_error(ER_FILE_NOT_FOUND, MYF(0), name, my_errno);
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break;
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}
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if (rc && !skip_error)
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DBUG_RETURN(1);
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DBUG_RETURN(0);
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}
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/*
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Rename all tables in list; Return pointer to wrong entry if something goes
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wrong. Note that the table_list may be empty!
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*/
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/*
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Rename tables/views in the list
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SYNPOSIS
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rename_tables()
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thd Thread handle
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table_list List of tables to rename
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skip_error Whether to skip errors
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DESCRIPTION
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Take a table/view name from and odd list element and rename it to a
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the name taken from list element+1. Note that the table_list may be
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empty.
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RETURN
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false Ok
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true rename failed
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*/
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static TABLE_LIST *
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rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
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{
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TABLE_LIST *ren_table, *new_table;
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DBUG_ENTER("rename_tables");
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for (ren_table= table_list; ren_table; ren_table= new_table->next_local)
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{
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new_table= ren_table->next_local;
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if (do_rename(thd, ren_table, new_table->db, new_table->table_name,
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new_table->alias, skip_error))
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DBUG_RETURN(ren_table);
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}
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DBUG_RETURN(0);
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}
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