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我的生产服务器上有一个运行 MySQL v5.5.8 的函数,可以正常执行。

当我尝试在运行 MySQL v5.5.9 的测试服务器上创建相同的功能时,创建失败并出现错误 1064。有人可以解释为什么在一台服务器上可以,而在另一台服务器上不行吗?为什么 MySQL 会返回如此模糊和无用的消息,我永远不会知道!!!

创建是:

DELIMITER $$

CREATE FUNCTION `CheckProjType` (type INT, cost BIGINT ) 
    RETURNS VARCHAR(50) 
    CHARSET latin1
    NO SQL
BEGIN
    DECLARE rtn VARCHAR(50);
    IF type = 5 THEN SET rtn = 'New Maint';
    ELSE
      IF type = 4 THEN SET rtn = 'Ongoing Maintenance';
      ELSE
        IF type = 3 THEN SET rtn = 'New Development';
        else
          IF cost > 1000000000 THEN SET rtn = 'New Expansion';
          else
            IF cost > 250000000 THEN SET rtn = 'Major Improvement';
            ELSE
              IF cost > 25000000 THEN SET rtn = 'Major Development';
              ELSE
                 SET rtn = 'Small Improvement';
              END IF;
            END IF;
          END IF;
        END IF;
      END IF;
    END IF;

  RETURN rtn;

END $$

DELIMITER ;

这是错误:

ERROR 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 '' at line 6

SQL Statement:

CREATE FUNCTION `CheckProjType` (type INT, cost BIGINT ) 

    RETURNS VARCHAR(50) 

    CHARSET latin1

    NO SQL

BEGIN

    DECLARE rtn VARCHAR(50)
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