Mysql Rename Multiple tables with a pattern

Question

I know how to run

RENAME TABLE onetable_test TO onetable;

But is there a method to rename many tables with a pattern and don't write a lot of code like

RENAME TABLE onetable_test TO onetable;
RENAME TABLE twotable_test TO twitable;
RENAME TABLE threetable_test TO threetable;    
...

I am using mysql.

Thanks!

Answer 1

Use below stored procedure ::

DELIMITER $$

CREATE

PROCEDURE `Rename_Tables`()

BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE tableName VARCHAR(50);
DECLARE newTableName VARCHAR(70);
DECLARE t_query VARCHAR(500);
DECLARE cur1 CURSOR FOR SELECT table_name FROM information_schema.tables WHERE table_name LIKE '%table_test' AND table_schema='test' ;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

OPEN cur1;

read_loop: LOOP
    FETCH cur1 INTO tableName;
    IF done THEN
        LEAVE read_loop;
    END IF;
    SET newTableName = SUBSTRING(tableName, 1,LOCATE('_',tableName)-1);
    SET t_query = CONCAT('RENAME TABLE ', tableName, ' TO ', newTableName);

    SET @myQuery = t_query;
    PREPARE stmt FROM @myQuery;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END LOOP;

END$$

DELIMITER ;

Replace table_schema with your table_schema name.

Answer 2

A slight modification on @ravnur's answer:

SET group_concat_max_len=5000;
SELECT group_concat(v.name separator '; ')
FROM (
    SELECT concat('RENAME TABLE ', t.table_name, ' TO ', replace(t.table_name, 'wp_', 'blog_')) name
    FROM information_schema.tables t
    WHERE table_name like 'wp_%'
) v;

Useful when you want to rename your Wordpress tables from the default prefix of wp_ to blog_ (for example). Copy and paste the output of that command into the mysql shell or phpMyAdmin.

Answer 3

For example:

select group_concat(v.name SEPARATOR ' ') 
from (
      select concat('rename table ', t.table_name, ' to ', substring(reverse(v.name), instr(reverse(v.name), '_') + 1, length(v.name)) name 
      from information_schema.tables t
      where 
          table_schema = 'put_your_table_schema'
          and table_name like '%_test'
     ) v;

1. Running this query will return script that should be executed to rename tables.
2. substring(reverse.....) rather than simple replace(v.name, '_test', '') used because we need to be sure that we will replace only _test occurrences only at the end of the string.

Hope it helps

Answer 4

I wanted to update what worked for me since this post is pretty old. I needed to add the ` mark before and after the table names. And don't forget to add the last ; because this can sometimes throw a syntax error.

SET group_concat_max_len=5000;
SELECT group_concat(v.name separator '; ')
FROM (
    SELECT concat('RENAME TABLE `', t.table_name, '` TO `', replace(t.table_name, 'wp_', 'wplocal_'), '`') name
    FROM information_schema.tables t
    WHERE table_name like 'wp_%'
) v;