MySQL：如果存儲過程

Question

我只是讓我的腳溼存儲過程。據我所看到的教程，這應該是有效的（MySQL的5.5）：

CREATE PROCEDURE someFunction (a VARCHAR(256), b VARCHAR(256)) 
    BEGIN 
     DECLARE haveAllVariables INT; 
     SET haveAllVariables = 1; 

    IF  a = "" THEN SET haveAllVariables = 0 
    ELSEIF b = "" THEN SET haveAllVariables = 0 
    END IF; 

但是，它是引發此錯誤：

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 'ELSEI 
F b = "" THEN SET haveAllVariables = 0 

哪裏是我的語法錯誤？

謝謝。

Answer 1

你缺少一個分號

CREATE PROCEDURE someFunction (a VARCHAR(256), b VARCHAR(256)) 
    BEGIN 
     DECLARE haveAllVariables INT; 
     SET haveAllVariables = 1; 

    IF  a = "" THEN SET haveAllVariables = 0; 
    ELSEIF b = "" THEN SET haveAllVariables = 0; 
    END IF; 

Answer 2

存儲過程是有點棘手。但這裏是我測試併發布給你的一個例子。在你的例子中，你錯過了幾個分號和最後的「END」。

DELIMITER $$ 
    CREATE PROCEDURE someFunction (a VARCHAR(256), b VARCHAR(256)) 
    BEGIN 
    DECLARE haveAllVariables INT; 
    SET haveAllVariables = 1; 

    IF a = '' THEN 
    SET haveAllVariables = 0; 
    ELSEIF b = '' THEN 
    SET haveAllVariables = 0; 
    END IF; 
END $$