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909f760701
When RENAME TABLE is executed, it apparently does not check whether the engine is available (unlike ALTER TABLE .. RENAME, which does). It means that if the engine in question was not loaded on some reason, the table might become unusable, since the engine won't know about the change. With this patch RENAME TABLE fails if storage engine is not available.
358 lines
10 KiB
C++
358 lines
10 KiB
C++
/*
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Copyright (c) 2000, 2013, Oracle and/or its affiliates.
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Copyright (c) 2011, 2013, Monty Program 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 <my_global.h>
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#include "sql_priv.h"
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#include "unireg.h"
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#include "sql_rename.h"
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#include "sql_cache.h" // query_cache_*
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#include "sql_table.h" // build_table_filename
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#include "sql_view.h" // mysql_frm_type, mysql_rename_view
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#include "sql_trigger.h"
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#include "lock.h" // MYSQL_OPEN_SKIP_TEMPORARY
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#include "sql_base.h" // tdc_remove_table, lock_table_names,
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#include "sql_handler.h" // mysql_ha_rm_tables
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#include "sql_statistics.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 bool do_rename(THD *thd, TABLE_LIST *ren_table, char *new_db,
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char *new_table_name, char *new_table_alias,
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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 two entries in the table_list form a pair of original name and
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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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bool binlog_error= 0;
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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_mode || thd->in_active_multi_stmt_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);
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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;
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if ((log_table_rename= check_if_log_table(ren_table, TRUE, NullS)))
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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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goto err;
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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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goto err;
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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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goto err;
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}
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}
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if (lock_table_names(thd, table_list, 0, thd->variables.lock_wait_timeout,
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0))
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goto err;
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error=0;
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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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*/
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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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if (!silent && !error)
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{
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binlog_error= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
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if (!binlog_error)
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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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err:
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DBUG_RETURN(error || binlog_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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static 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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handlerton *hton;
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const char *new_alias, *old_alias;
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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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DBUG_ASSERT(new_alias);
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if (ha_table_exists(thd, new_db, new_alias))
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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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if (ha_table_exists(thd, ren_table->db, old_alias, &hton) && hton)
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{
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DBUG_ASSERT(!thd->locked_tables_mode);
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tdc_remove_table(thd, TDC_RT_REMOVE_ALL,
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ren_table->db, ren_table->table_name, false);
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if (hton != view_pseudo_hton)
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{
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if (!(rc= mysql_rename_table(hton, ren_table->db, old_alias,
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new_db, new_alias, 0)))
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{
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LEX_STRING db_name= { ren_table->db, ren_table->db_length };
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LEX_STRING table_name= { ren_table->table_name,
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ren_table->table_name_length };
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LEX_STRING new_table= { (char *) new_alias, strlen(new_alias) };
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(void) rename_table_in_stat_tables(thd, &db_name, &table_name,
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&db_name, &new_table);
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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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ren_table->table_name,
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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(hton, new_db, new_alias,
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ren_table->db, old_alias, NO_FK_CHECKS);
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}
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}
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}
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else
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{
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/*
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change of schema is not allowed
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except of ALTER ...UPGRADE DATA DIRECTORY NAME command
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because a view has valid internal db&table names in this case.
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*/
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if (thd->lex->sql_command != SQLCOM_ALTER_DB_UPGRADE &&
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strcmp(ren_table->db, new_db))
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my_error(ER_FORBID_SCHEMA_CHANGE, MYF(0), ren_table->db, new_db);
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else
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rc= mysql_rename_view(thd, new_db, new_alias, ren_table);
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}
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}
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else
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{
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my_error(ER_NO_SUCH_TABLE, MYF(0), ren_table->db, old_alias);
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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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