下訂單存儲過程 - MYSQL

BEGIN

    DECLARE smark INT; DECLARE orderId INT; /*查詢課程是否存在，若是不存在就不執行訂單操做了*/
    SET @count = (SELECT count(1) FROM t_course WHERE id = courseId); IF @count = 0 THEN 
        SELECT "noexist"; ELSE 
        /*查詢某個課程是否已經報名，若是已經報名了就不須要在報名了*/
        SET @c1 = (SELECT COUNT(1) FROM t_shoporder sd WHERE sd.user_id = userId AND sd.course_id = courseId AND sd.is_delete = 0); /*我報名的課程*/
        IF @c1 = 0 THEN
            /*若是沒有報名*/
            /*訂單號的設定*/
            SET @orderNum = CONVERT(CONCAT( "ms_",DATE_FORMAT(NOW(),'%Y%m%d'), courseId, CEIL(RAND() * 99999), userId ),CHARACTER); SET @price = (SELECT tprice FROM t_course WHERE id = courseId); /*保存訂單*/
            INSERT INTO t_shoporder ( user_id, is_delete, num, price, description, ip, ipAddress, order_number, STATUS, course_id, type )VALUES( userId, 0, tnum, @price, CONCAT("用戶【",username,"】,在",DATE_FORMAT(NOW(),'%Y-%m-%d'),"位於",ip,"/",ipAddress,"提交訂單，數量是",tnum,",金額是：￥",@price), ip, ipAddress, @orderNum, 0, courseId, NULL ); /*查詢當前訂單的最後一條ID*/
            SET @orderId = (SELECT id FROM t_shoporder WHERE order_number = @orderNum); /*拼接訂單號，確保惟一*/
            SET @onumber = CONVERT(CONCAT(@orderNum,@orderId), CHARACTER); /*修改訂單號*/
            UPDATE t_shoporder SET order_number = @onumber WHERE id = @orderId; /*返回訂單和狀態*/
            SELECT CONCAT(@orderId,"#",0); ELSE
            SELECT ts.id, ts.status INTO orderId, smark FROM t_shoporder ts WHERE ts.is_delete = 0 AND ts.course_id = courseId AND ts.user_id userId; IF smark = 0 THEN
                SELECT CONCAT(orderId,"#",0);        /*已經支付了*/
            ELSE 
                SELECT CONCAT(orderId,"#",1);        /*已經支付了*/
            END IF; END IF; END IF; END;