MySQL 存储函数创建错误 ERROR 1064 &第1327章

Question

我正在使用 MySQL v5.1.36，我正在尝试使用此代码创建一个存储函数。

DELIMITER //
CREATE FUNCTION `modx`.getSTID (x VARCHAR(255)) RETURNS INT DETERMINISTIC
    BEGIN
    DECLARE y INT;
    SELECT id INTO y
    FROM `modx`.coverage_state
    WHERE `coverage_state`.name = x;
    RETURN y;
    END//

当进入 MySQL 控制台时，我收到此响应。

mysql>  DELIMITER //
mysql>  CREATE FUNCTION `modx`.getSTID (x VARCHAR(255)) RETURNS INT DETERMINISTIC
    ->          BEGIN
    ->          DECLARE y INT;
ERROR 1064 (42000): 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 '' at
line 3
mysql>          SELECT id INTO y
    ->          FROM `modx`.coverage_state
    ->          WHERE `coverage_state`.name = x;
ERROR 1327 (42000): Undeclared variable: y
mysql>          RETURN y;
ERROR 1064 (42000): 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 'RETUR
N y' at line 1
mysql>          END//

从我在网上可以找到的内容来看，我的语法是正确的。我做错了什么？

Answer 1

从 mysql 控制台创建函数/过程时，第一个命令应该是 DELIMITER //。否则，它使用默认分隔符（;），

Answer 2

我通过在变量周围添加 `` 解决了我的问题。这是我最终得到的代码。

DELIMITER //
CREATE FUNCTION `modx`.getSTID (x VARCHAR(255)) RETURNS INT DETERMINISTIC
    BEGIN
    DECLARE `y` INT;
    SELECT id INTO `y`
    FROM `modx`.coverage_state
    WHERE `coverage_state`.name = `x`;
    RETURN `y`;
    END//
DELIMITER ;