Question

我有两张桌子

bill
(id,amount,points)

bill_history
(id,bill_id,amount,points)

当在bill_history中插入一行时，我想总结一下bill_history表中的金额和点数，并且应该根据bill_id在账单表中更新

Answer 1

您只需在Definer表格上创建一个触发器AFTER INSERT。

在此触发器中，您可以编写逻辑来更新bill_history表中的SUM(AMOUNT)和SUM(POINT)。

Answer 2

您可以使用TRIGGER：

DELIMITER |

CREATE TRIGGER ins_bill_history AFTER INSERT ON bill_history
FOR EACH ROW
    BEGIN
        UPDATE bill 
            SET points = (SELECT SUM(points) FROM bill_history WHERE bill_history.bill_id = NEW.bill_id),
                amount = (SELECT SUM(amount) FROM bill_history WHERE bill_history.bill_id = NEW.bill_id) 
        WHERE bill.id = NEW.bill_id;
    END;
|

另一种解决方案是动态使用VIEW SUM points和amount：

CREATE VIEW v_bill AS 
    SELECT bill.*, SUM(bh.points) AS 'points', SUM(bh.amount) AS 'amount'
    FROM bill b INNER JOIN bill_history bh ON b.id = bh.bill_id 
    GROUP BY b.id

注意：如果您使用VIEW，则必须删除表points上的列amount和bill。

Answer 3

尝试这种方式：

INSERT INTO YourTable(columns....)
   VALUES(..........)

SET v_lastinsertedrecord = LAST_INSERT_ID()

UPDATE YourTable SET (COLUMNS='value') WHERE id=@lastinsertedrecord

我想在将行插入另一个表后更新mysql中的表

3 个答案: