如何使用单个存储过程一次更新两个表？答案

【问题标题】：How to update two tables at a time using a single stored procedure?如何使用单个存储过程一次更新两个表？
【发布时间】：2012-03-01 06:55:11
【问题描述】：

我的数据库中有两个表 Requests 和 Balance 跟踪器没有关系....但是我想从两个表中选择数据并将其绑定到两个网格...

请求

EmpID | EmpRqsts | EmpDescription | ApproverID | ApprovedAmount | RequestPriority
   1  | asdfsb   | sadbfsbdf      |     1      |
   2  | asbfd    | sjkfbsd        |     1      |

余额追踪器

EmpId | BalanceAmnt | LastUpdated | lastApprovedAmount
  1   |    5000     | sdfbk       |
  2   |    3000     | sjbfsh      |

现在我想根据EmpID 一次更新两个表。无论何时批准金额，都应在request 表列[ApprovedAmount] 中更新并优先...

当[ApprovedAmount] 更新时，[BalanceAmnt] 的余额跟踪器也应该通过添加批准的金额来更新，[LastUpdated]，[lastApprovedAmount] 应该更新日期和时间

谁能帮我查询一下....

【问题讨论】：

标签： sql-server-2008 c#-4.0

【解决方案1】：

首先创建一个存储过程来更新您的[ApprovedAmount] 列

create procedure SP_UpdateRequestedAmount
    (@EmpID int,
     @AmountApproved varchar (50),
     @RequestPriority varchar (50))
as
begin
    Update Requests   
    set ApprovedAmount = @AmountApproved,
        Request_Priority = @RequestPriority 
    where
        Emp_ID = @EmpID
end

然后在 [AmountApproved] 列更新时使用触发器更新另一个表

CREATE TRIGGER tr_ApprovedAmount_UPDATE 
ON Requests   
AFTER UPDATE 
AS 
    --Make sure Priority was changed 
    IF NOT UPDATE(ApprovedAmount) 
        RETURN 

    --Determine if Priority was changed to high 

    -- PUT your queries for Updatating other table 
     declare @Balance_LastUpdated date
     declare @ApprovedDate date

     UPDATE Balance Tracker
     SET Balance Tracker.Balance_BalanceAmount =  Balance Tracker.Balance_BalanceAmount +   PTS_Requests.Request_IsApproved,
         Balance_LastUpdated = @Balance_LastUpdated,
         Balance_LastApproval = @ApprovedDate
     FROM
         Balance Tracker 
     INNER JOIN
         Requests ON Balance Tracker.Emp_ID = Requests.Emp_ID

希望这会有所帮助............

【讨论】：

【解决方案2】：

请在没有触发器的情况下也试试这个

    CREATE procedure SP_UpdateRequestedAmount
   (
   @EmpID int,
   @AmountApproved varchar (50),
   @RequestPriority varchar (50)
   )
   as
   begin

   --Declare a variable for know current ApprovedAmount (that is before updation)
   Declare @CurrentApprovedAmount AS INT

   --set current ApprovedAmount
   SET @AmountApproved =(SELECT ApprovedAmount FROM Requests WHERE EmpID=@EmpID)

   --check is @CurrentApprovedAmount differ from @AmountApproved
   IF (@CurrentApprovedAmount!=@AmountApproved)
        BEGIN
                --Here we need to update  Requests and BalanceTracker
        END
    ELSE
        BEGIN
            --only update Requests -- no change in AmountApproved
        END 

   go

【讨论】：