我正在尝试使用此处给出的答案重命名我的数据库表:
How To have Dynamic SQL in MySQL Stored Procedure
但是当我尝试在 phpMyAdmin SQL 选项卡中运行以下命令时,出现 SQL 错误:
delimiter //
CREATE PROCEDURE dynamic(IN tbl CHAR(64), IN col CHAR(64))
BEGIN
SET @s = CONCAT('SELECT 'RENAME TABLE ',
GROUP_CONCAT('', TABLE_SCHEMA, ''.'', TABLE_NAME,
' TO ', TABLE_SCHEMA, ''='.osx_''', TABLE_NAME, '')) AS q
FROM
information_schema.Tables WHERE TABLE_SCHEMA='my_database'';;'
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END
//
delimiter ;
错误如下:
#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
'RENAME TABLE ', GROUP_CONCAT('', TABLE_SCHEMA, ''.'', TABLE_NAME,' at line 3
我没有看到错误,有人能发现它吗?
--编辑--
查看 Max 的答案后,我使用反引号重新格式化了查询:
CREATE PROCEDURE dynamic(IN tbl CHAR(64), IN col CHAR(64))
BEGIN
SET @s = SELECT
CONCAT('RENAME TABLE ',
GROUP_CONCAT('`', TABLE_SCHEMA, '`.`', TABLE_NAME,
'` TO `', TABLE_SCHEMA, '`.`osx_', TABLE_NAME, '`')) AS q
FROM
`information_schema`.`Tables` WHERE TABLE_SCHEMA=`my_database`;
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END
从我发现的另一个示例(见下文)中,我仍然收到 sql 错误:
#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 'SELECT
CONCAT('RENAME TABLE ',
GROUP_CONCAT('`', TABLE_SCHEMA, '`.`',' at line 3
我还尝试了另一个例子:
SELECT
CONCAT('RENAME TABLE ',
GROUP_CONCAT('`', TABLE_SCHEMA, '`.`', TABLE_NAME,
'` TO `', TABLE_SCHEMA, '`.`osx_', TABLE_NAME, '`')) AS q
FROM
`information_schema`.`Tables` WHERE TABLE_SCHEMA='my_database';
这会执行但会产生以下警告:
This table does not contain a unique column.
Grid edit, checkbox, Edit, Copy and Delete features are not available.
并且不会对数据库执行任何操作。
救命!
最佳答案
'SELECT 'RENAME
您已使用单引号打开 CONCAT()
参数,当 MySQL 看到另一个参数时,它需要下一个参数。
您可以转义引号或对字符串文字使用双引号。
CONCAT('SELECT "RENAME TABLE ", GROUP_CONCAT( ...
关于mysql - 重命名 SQL 中的数据库表错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20831344/