Drop multiple databases with names matching a pattern

Question

I want to drop all the databases starting with a word.

abc
xyz
cms_db1
cms_db2
cms_xyz
pqr

In the example given above, I will like to drop all

Answer 1

If you wish to stay completely within MySQL/MariaDB (i.e. without using bash scripts and such) you can do the following:

DELIMITER //
CREATE PROCEDURE clean()
BEGIN
    SET @query := (SELECT CONCAT('DROP DATABASE ', SCHEMA_NAME, ';') FROM `information_schema`.`SCHEMATA` WHERE SCHEMA_NAME LIKE 'dbtVDB%' LIMIT 1);
    WHILE @query != '' DO
        PREPARE stmt FROM @query;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
        SET @query := (SELECT CONCAT('DROP DATABASE ', SCHEMA_NAME, ';') FROM `information_schema`.`SCHEMATA` WHERE SCHEMA_NAME LIKE 'cms%' LIMIT 1);
    END WHILE;
    DELETE FROM mysql.db WHERE mysql.db.Db LIKE 'cms%';
END;
//
DELIMITER ;
CALL clean();
DROP PROCEDURE clean;