Question

我试图在MySQL 5.5.38中编写我的第一个存储函数，但我无法通过一个恼人的语法错误。我已经检查了MySQL文档，但我仍然无法看到问题是什么，错误信息只显示You have an error in your SQL syntax; blah blah blah ... at line 1。

以下是代码：

DELIMITER $$

CREATE FUNCTION distm (lat1 DOUBLE, lng1 DOUBLE, lat2 DOUBLE, lng2 DOUBLE)
    RETURNS DOUBLE NO SQL DETERMINISTIC
BEGIN
    DECLARE radius DOUBLE;
    SET radius = 6371008.771415059;

    DECLARE x1, y1, x2, y2, dlat, dlng DOUBLE;
    SET x1 = RADIANS(lng1);
    SET y1 = RADIANS(lat1);
    SET x2 = RADIANS(lng2);
    SET y2 = RADIANS(lat2);
    SET dlng = x2 - x1;
    SET dlat = y2 - y1;

    DECLARE dist DOUBLE;
    SET dist = 2 * radius * ASIN(
        SQRT(
            POW(SIN(dlat / 2), 2)
            + COS(y1) * COS(y2) * POW(SIN(dlng / 2), 2)
        )
    );
    RETURN dist;
END$$

DELIMITER ;

编辑：确切的错误消息如下：

SQL 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 'DELIMITER $$

CREATE FUNCTION distm (lat1 DOUBLE, lng1 DOUBLE, lat2 DOUBLE, lng2' at line 1

Answer 1

尝试删除DROP之前的DELIMITER $$语句，然后重新运行。

另外，将行RETURNS DOUBLE NO SQL DETERMINISTIC更改为以下。请注意，它不是NO SQL DETERMINISTIC而是NOT DETERMINISTIC

RETURNS DOUBLE NOT DETERMINISTIC

创建存储函数时出现语法错误

1 个答案: