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/* 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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Atomic rename of table; RENAME TABLE t1 to t2, tmp to t1 [,...]
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#include <drizzled/server_includes.h>
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#include <drizzled/error.h>
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#include <drizzled/table_list.h>
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#include <drizzled/session.h>
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#include <drizzled/lock.h>
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static TableList *rename_tables(Session *session, TableList *table_list,
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static TableList *reverse_table_list(TableList *table_list);
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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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bool drizzle_rename_tables(Session *session, TableList *table_list, bool silent)
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TableList *ren_table= 0;
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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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if (session->locked_tables || session->active_transaction())
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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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mysql_ha_rm_tables(session, table_list, false);
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if (wait_if_global_read_lock(session,0,1))
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pthread_mutex_lock(&LOCK_open);
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if (lock_table_names_exclusively(session, table_list))
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pthread_mutex_unlock(&LOCK_open);
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if ((ren_table=rename_tables(session,table_list,0)))
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/* Rename didn't succeed; rename back the tables in reverse order */
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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(session, 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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An exclusive lock on table names is satisfactory to ensure
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no other thread accesses this table.
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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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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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write_bin_log(session, true, session->query, session->query_length);
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pthread_mutex_lock(&LOCK_open);
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unlock_table_names(session, table_list, (TableList*) 0);
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pthread_mutex_unlock(&LOCK_open);
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start_waiting_global_read_lock(session);
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table_list pointer to table _list
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pointer to new (reversed) list
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static TableList *reverse_table_list(TableList *table_list)
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TableList *next= table_list->next_local;
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table_list->next_local= prev;
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Rename a single table or a view
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session 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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Rename a single table or a view.
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do_rename(Session *session, TableList *ren_table, char *new_db, char *new_table_name,
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char *new_table_alias, bool skip_error)
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const char *new_alias, *old_alias;
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if (lower_case_table_names == 2)
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old_alias= ren_table->alias;
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new_alias= new_table_alias;
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old_alias= ren_table->table_name;
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new_alias= new_table_name;
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handlerton *hton= NULL;
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if(ha_table_exists_in_engine(session, ren_table->db, old_alias, &hton)
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!= HA_ERR_TABLE_EXIST)
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my_error(ER_NO_SUCH_TABLE, MYF(0), ren_table->db, old_alias);
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if (ha_table_exists_in_engine(session, new_db, new_alias)
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!=HA_ERR_NO_SUCH_TABLE)
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my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_alias);
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return(1); // This can't be skipped
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rc= mysql_rename_table(hton,
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ren_table->db, old_alias,
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new_db, new_alias, 0);
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if (rc && !skip_error)
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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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Rename tables/views in the list
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session 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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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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rename_tables(Session *session, TableList *table_list, bool skip_error)
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TableList *ren_table, *new_table;
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for (ren_table= table_list; ren_table; ren_table= new_table->next_local)
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new_table= ren_table->next_local;
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if (do_rename(session, ren_table, new_table->db, new_table->table_name,
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new_table->alias, skip_error))