筆記-Microsoft SQL Server 2008技術內幕：T-SQL語言基礎-09 事務和併發

事務必須有四個屬性：原子性、一致性、隔離性、持久性，這四個屬性的首字母能夠縮寫爲ACID。

如下代碼定義了一個事務，插入新訂單數據：

-- Start a new transaction
BEGIN TRAN;

  -- Declare a variable
  DECLARE @neworderid AS INT;

  -- Insert a new order into the Sales.Orders table
  INSERT INTO Sales.Orders
      (custid, empid, orderdate, requireddate, shippeddate, 
       shipperid, freight, shipname, shipaddress, shipcity,
       shippostalcode, shipcountry)
    VALUES
      (85, 5, '20090212', '20090301', '20090216',
       3, 32.38, N'Ship to 85-B', N'6789 rue de l''Abbaye', N'Reims',
       N'10345', N'France');

  -- Save the new order ID in a variable
  SET @neworderid = SCOPE_IDENTITY();

  -- Return the new order ID
  SELECT @neworderid AS neworderid;

  -- Insert order lines for new order into Sales.OrderDetails
  INSERT INTO Sales.OrderDetails
      (orderid, productid, unitprice, qty, discount)
    VALUES(@neworderid, 11, 14.00, 12, 0.000);
  INSERT INTO Sales.OrderDetails
      (orderid, productid, unitprice, qty, discount)
    VALUES(@neworderid, 42, 9.80, 10, 0.000);
  INSERT INTO Sales.OrderDetails
      (orderid, productid, unitprice, qty, discount)
    VALUES(@neworderid, 72, 34.80, 5, 0.000);

-- Commit the transaction
COMMIT TRAN;