與新條目

Question

更新列我創建具有以下屬性表：

VendorAccount(
    Ven_AccountId, 
    Ven_RegNo, 
    Ven_TxDate, 
    Ven_Invoice_RefNo,  
    TotalAmount, 
    Paid_ToVen ,  
    Balance 
) 

在上表中，當我選擇Ven_Invoice_RefNo從彈出LOV它讓我從另一個Table.I的TotalAmount想，每當我輸入Paid_ToVen列中的值，則應從Total_Amount減去該數量作爲Balance，新減值應顯示在下一項的TotalBalance列中。以下是表格的報告。

我想更新的價值i - e 2300在TotalAmount列在新條目。有沒有觸發器或查詢。

Answer 1

更新後您可以嘗試trigger。你需要一個像下面這樣的邏輯。請根據您的表格使用正確的字段並嘗試一下。

CREATE TRIGGER trg_totalBalance AFTER UPDATE ON vendoraccount 
FOR EACH ROW 
BEGIN 
    DECLARE new_balance INT; 
    DECLARE new_total INT; 
    DECLARE new_paid INT; 

    SELECT balance INTO old_balance, 
    total INTO old_total, 
    paidtoven INTO new_paid 
    FROM vendoraccount 
    WHERE ven_regno = new.ven_regno 
    AND ven_invoice_refno = new.ven_invoice_refno; 

    -- depending on your current balance update logic, 
    -- you could wrap this update with an IF/ELSE 
    -- IF XYZ THEN 
    UPDATE vendoraccount SET totalamount = old_total + old_balance - new_paid, 
    balance = totalamount - new_paid 
    WHERE ven_regno = new.ven_regno 
    AND ven_invoice_refno = new.ven_invoice_refno; 
    -- END IF; 
END;