Question

我有一个以下的sql函数，我试图使用嵌套的if-else语句。

该功能可以正常使用嵌套＆＃39;如果＆＃39;声明删除。但添加后，会显示错误。

BEGIN
  DECLARE daysEntitled DECIMAL(4,2);
  DECLARE joinDate DATE;
  DECLARE dayOfMonth INT(4);
  SET joinDate = (SELECT join_date FROM users WHERE id = user);
  SET daysEntitled = TIMESTAMPDIFF(MONTH, joinDate, currentDate);
  IF YEAR(joinDate) = YEAR(currentDate) THEN
    SET currentDate = DATE_FORMAT(currentDate,'%Y-12-31');
    SET daysEntitled = TIMESTAMPDIFF(MONTH, joinDate, currentDate);
    SET dayOfMonth = CAST(DAY(joinDate) AS UNSIGNED);   

****** On adding this block ********

    IF dayOfMonth <= 15 THEN
       SET daysEntitled += 1.00;
    ENDIF;

****** On adding this block ********

  ELSEIF YEAR(joinDate) < YEAR(currentDate) THEN    
    SET daysEntitled = 8.00;    
  ELSEIF YEAR(joinDate) > YEAR(currentDate) THEN
    SET daysEntitled = 12.00;   
  ELSE
    SET daysEntitled = 4.00;  
  END IF;
  RETURN daysEntitled;
END

代码似乎很好。我无法解决出错的问题。很感谢任何形式的帮助。感谢。

Answer 1

在MySQL中使用嵌套的IF语句没有任何问题。我认为问题在于你试图增加变量的方式：

SET daysEntitled += 1.00;
                 ^^ not allowed

请改用此代码：

IF dayOfMonth <= 15 THEN
   SET daysEntitled = daysEntitled + 1.00;
ENDIF;

嵌套if-else语句的SQL语法错误[mysql]

1 个答案: