重命名 table 准备好的语句

Question

我正在尝试在 MySQL 中编写一个存储过程，它根据指定的前缀（在本例中为 'migrate_'）删除和重命名表。代码应该递归地重命名所有以 'migrate_' 开头的表，直到 none 保留，但是，我在尝试运行时遇到错误。

BEGIN

SELECT COUNT(*) INTO @num_migrate
FROM information_schema.tables a 
WHERE a.table_name LIKE 'migrate_%';

IF (@num_migrate > 0) THEN
    SELECT concat( 'USE `md_rails`; DROP TABLE IF EXISTS `', 
            Replace(tbls.table_name,'migrate_',''), '`; ', 
        'RENAME TABLE `', tbls.table_name, '` TO `', 
            Replace(tbls.table_name,'migrate_',''), '`;' ) INTO @b
    FROM information_schema.tables tbls
    WHERE tbls.table_name LIKE 'migrate_%' LIMIT 1;
    PREPARE stmt FROM @b;
    EXECUTE stmt;
    CALL handle_migrated_tables();
END IF;


END

我得到的错误是：

Error Code: 1064. You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use 
near 'DROP TABLE IF EXISTS second_test; RENAME TABLE migrate_second_test TO 
second_tes' at line 1

我已经尝试运行单独使用 select 语句生成的代码，它满足了我的需要，但出于某种原因，它不喜欢准备好的语句.

如有任何帮助，我们将不胜感激！

Answer 1

Lashane答对了！如果有人想知道，这里是最终（工作）代码：

CREATE PROCEDURE `handle_migrated_tables`()
    BEGIN
        SET max_sp_recursion_depth=50;

        SELECT COUNT(*) INTO @num_migrate
        FROM information_schema.tables a 
        WHERE a.table_name LIKE 'migrate_%';

        IF (@num_migrate > 0) THEN

            SELECT tbls.table_name INTO @tbl
            FROM information_schema.tables tbls
            WHERE tbls.table_name LIKE 'migrate_%' LIMIT 1;

            SET @a = concat('DROP TABLE IF EXISTS md_rails.', Replace(@tbl, 'migrate_', ''));
            PREPARE stmt FROM @a;
            EXECUTE stmt;
            DEALLOCATE PREPARE stmt;

            SET @b = concat('RENAME TABLE md_rails.', @tbl, ' TO ', Replace(@tbl, 'migrate_', ''));
            PREPARE stmt FROM @b;
            EXECUTE stmt;
            DEALLOCATE PREPARE stmt;        

            CALL handle_migrated_tables();
        END IF;


    END

重命名 table 准备好的语句

rename table prepared statement

mysql

sql

stored-procedures

prepared-statement