Question

DELIMITER $$

CREATE

    PROCEDURE `cheque_alert`.`SavePoData`(IN poNo VARCHAR(25),IN releaseOrderDate DATE,IN expiryDate DATE,IN enteredDateTime DATETIME,IN enteredBy VARCHAR(8) ,
    IN poItemCode VARCHAR(25),IN poItemsId CHAR(1),IN poItemDescription VARCHAR(75),IN quantity DOUBLE,IN amount DOUBLE
    )

    BEGIN
        SELECT CASE WHEN ((SELECT 1 FROM `cheque_alert`.`po_main` WHERE po_no=poNo)>0)
        THEN        
        INSERT INTO `cheque_alert`.`po_items_details`
            (`pomainid_id`,
             `po_item_code`,
             `po_items_id`,
             `po_item_description`,
             `quantity`,
             `amount`)
        VALUES ((SELECT id FROM `cheque_alert`.`po_main` WHERE po_no =poNo),
            poItemCode,poItemsId,poItemDescription,quantity,amount) 

    ELSE        
        INSERT INTO `cheque_alert`.`po_main`
            (`po_no`,
             `release_order_date`,
             `expiry_date`,
             `entered_date_time`,
             `entered_by`)
        VALUES (poNo,releaseOrderDate,expiryDate,enteredDateTime,(SELECT ID FROM cheque_alert.user_login WHERE USER_ID=enteredBy));

        INSERT INTO `cheque_alert`.`po_items_details`
            (`pomainid_id`,
             `po_item_code`,
             `po_items_id`,
             `po_item_description`,
             `quantity`,
             `amount`)
        VALUES ((SELECT LAST_INSERT_ID(),
            poItemCode,
            poItemsId,
            poItemDescription,
            quantity,
            amount);

    END;
    END$$

DELIMITER ;

产生错误：

错误代码：1064

您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在'INTO cheque_alert附近使用正确的语法。po_items_details               （pomainid_id，                第14行的'po_item_cod'

请让我知道我所犯的错误？

Answer 1

IF-ELSE结构应该是这样的：

IF(some query to check something) THEN
BEGIN
    insert something
END
ELSE
BEGIN
    insert something
    insert something else
END

同时CASE只会定义一些值，而不是整个查询。例如：

SELECT CASE name WHEN 'hamburger' THEN 'unhealthy' ELSE 'healthy' END
FROM food

如何在MySql中使用Select Case

1 个答案: