Shawn wrote
>I have a 2.1GB database with all InnoDB tables in it that I wanted to
>change the name of. It took me longer to write my RENAME TABLE
>script than it did to actually move the data.
It's easier & less error-prone to do it in an sproc which prepares &
executes the rename cmds. Only hitch is that MySQL doesn't yet let you
prepare a drop database cmd.
SET GLOBAL log_bin_trust_routine_creators=TRUE;
DROP PROCEDURE IF EXISTS RenameDatabase;
DELIMITER |
CREATE PROCEDURE RenameDatabase (IN oldname CHAR(64), IN newname CHAR(64))
BEGIN
DECLARE sname CHAR(64) DEFAULT NULL;
DECLARE rows INT DEFAULT 1;
CREATE DATABASE IF NOT EXISTS newname;
REPEAT
SELECT table_name INTO sname
FROM information_schema.tables AS t
WHERE t.table_schema = oldname
LIMIT 1;
SET rows = FOUND_ROWS();
IF rows = 1 THEN
SET @scmd = CONCAT( 'RENAME TABLE ', oldname, '.', sname,
' TO ', newname, '.', sname );
PREPARE cmd FROM @scmd;
EXECUTE cmd;
DEALLOCATE PREPARE cmd;
ELSE
SET @scmd = CONCAT( "UPDATE mysql.db SET Db = '",
@newname,
"' WHERE Db = '", @oldname, "'" );
PREPARE cmd FROM @scmd;
EXECUTE cmd;
SET @scmd = CONCAT( "UPDATE mysql.columns_priv SET Db = '",
@newname,
"' WHERE Db = '", @oldname, "'" );
PREPARE cmd FROM @scmd;
EXECUTE cmd;
DEALLOCATE PREPARE cmd;
FLUSH PRIVILEGES;
-- MySQL does not yet support PREPARE DROP DATABASE:
-- SET @scmd = CONCAT( 'DROP DATABASE ', oldname );
-- PREPARE cmd FROM @scmd;
-- EXECUTE cmd;
-- DEALLOCATE PREPARE cmd;
END IF;
UNTIL rows = 0 END REPEAT;
END;
|
DELIMITER ;
PB
-----
SGreen@stripped wrote:
>Robert L Cochran <cochranb@stripped> wrote on 10/17/2005 07:37:26 AM:
>
>
>
>>I think you can just rename the directory that that database lives in.
>>If you read the documentation for CREATE DATABASE in dev.mysql.com,
>>you'll see they discuss renaming the directory (although it does not
>>directly say this can be done to rename the database, but it comes
>>really close to that.) Based on the documentation the database name is
>>simply a directory name, no more and no less.
>>
>>Renaming tables has its own command syntax, you can look it up.
>>
>>Bob Cochran
>>
>>
>>
>>Octavian Rasnita wrote:
>>
>>
>>
>>>Hi,
>>>
>>>Is there a command for renaming a MySQL database?
>>>
>>>Thank you.
>>>
>>>Teddy
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>
>The only way I have done it has been to create an empty database with the
>name I want. Then I used RENAME TABLE to "move" all of the tables into the
>new database. Sure it takes a lot of RENAME TABLE statements but it works.
>If these are InnoDB tables, all I am doing is moving metadata and that is
>FAST. For MyISAM or other file-based storage engines, it copies files from
>one folder to another. For some file systems, that is also just a metadata
>shift and will still be FAST. Others will require a physical move of the
>data from one location to another (good thing that those filesystems are
>becoming quite rare these days)
>
>I have a 2.1GB database with all InnoDB tables in it that I wanted to
>change the name of. It took me longer to write my RENAME TABLE script than
>it did to actually move the data.
>
>http://dev.mysql.com/doc/refman/4.1/en/rename-table.html
>
>Shawn Green
>Database Administrator
>Unimin Corporation - Spruce Pine
>
>
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