mysql 删除多个库

DELIMITER //

CREATE PROCEDURE DropMultipleDatabases()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE db_name VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT schema_name FROM information_schema.schemata WHERE schema_name LIKE 'db_%';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO db_name;
        IF done THEN
            LEAVE read_loop;
        END IF;
        SET @drop_sql = CONCAT('DROP DATABASE ', db_name);
        PREPARE stmt FROM @drop_sql;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;

CALL DropMultipleDatabases();