我想在另一張表中插入一行后更新mysql中的表

Question

我有兩張桌子

bill
(id,amount,points)

bill_history
(id,bill_id,amount,points)

當將一行插入bill_history時，我想總結bill_history表中的金額和積分，因此應根據bill_id在bill表中對其進行更新

Answer 1

您只需在bill_history表上創建一個AFTER INSERT觸發器bill_history 。

在此觸發器中，您可以編寫邏輯以更新bill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;
|

另一個解決方案是使用VIEW來即時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：如果使用VIEW ，則必須刪除表bill上的列points和amount 。

Answer 3

嘗試這種方式：

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

SET v_lastinsertedrecord = LAST_INSERT_ID()

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