带插入和存储的存储过程使用标识列更新

时间:2013-02-13 06:08:23

标签: sql sql-server sql-server-2008

我有一个名为'tasks'的表,'task id'是标识列,对于那个表我必须编写保存存储过程,其中当没有给出'task id'时它应该插入值,当给出'task id'它应该更新表。

当任务ID是标识列时,如何通过示例解释任何人都可以实现这一点。 这是代码

Alter PROCEDURE TaskSave
(
@taskid int,   
@ProjectId int,
@EmployeeId int,
@TaskName nvarchar(50),
@Duration_Hrs int,
@StartDate nvarchar(20),
@FinishDate nvarchar(20),
@CreateUserId int,
@CreatedDate nvarchar(20),
@ModifiedUserID int,
@ModifiedDate nvarchar(20),
@Is_CommonTask bit
) AS

BEGIN
    IF Exists( select null from TblTasks where TaskId=@TaskId)
    BEGIN
        INSERT TblTasks
        VALUES (@ProjectId,@EmployeeId,@TaskName,@Duration_Hrs,
                @StartDate,@FinishDate,@CreateUserId,@CreatedDate,
                @ModifiedUserID,@ModifiedDate,@Is_CommonTask)
    END
    ELSE
    BEGIN
        UPDATE TblTasks SET 
        StartDate=@StartDate,FinishDate=@FinishDate,
        Duration_Hrs=@Duration_Hrs 
        WHERE TaskId=@TaskId
    END
END
GO

4 个答案:

答案 0 :(得分:0)

您已关闭,请检查记录是否不存在并执行插入,否则更新。您还可以将@TaskId参数声明为OUTPUT,并在插入时使用SCOPE_IDENTITY()函数返回:

ALTER PROCEDURE TaskSave(
    @TaskId INT = NULL OUTPUT
    , @ProjectId INT
    , @EmployeeId INT
    , @TaskName NVARCHAR(50)
    , @Duration_Hrs INT
    , @StartDate NVARCHAR(20)
    , @FinishDate NVARCHAR(20)
    , @CreateUserId INT
    , @CreatedDate NVARCHAR(20)
    , @ModifiedUserID INT
    , @ModifiedDate NVARCHAR(20)
    , @Is_CommonTask BIT
)
AS
BEGIN

    IF NOT(EXISTS(SELECT * FROM TblTasks WHERE TaskId = @TaskId))
    BEGIN
        INSERT INTO TblTasks(
            ProjectId
            , EmployeeId
            , TaskName
            , Duration_Hrs
            , StartDate
            , FinishDate
            , CreateUserId
            , CreatedDate
            , ModifiedUserID
            , ModifiedDate
            , Is_CommonTask
        )
        VALUES(
            @ProjectId
            , @EmployeeId
            , @TaskName
            , @Duration_Hrs
            , @StartDate
            , @FinishDate
            , @CreateUserId
            , @CreatedDate
            , @ModifiedUserID
            , @ModifiedDate
            , @Is_CommonTask
        )
        SET @TaskId = SCOPE_IDENTITY()
    END
    ELSE
    BEGIN
        UPDATE TblTasks SET 
            StartDate = @StartDate
            , FinishDate = @FinishDate
            , Duration_Hrs = @Duration_Hrs
        WHERE TaskId=@TaskId
    END
END
GO

答案 1 :(得分:0)

首先,给你的输入变量TaskID一个默认值,如下所示,然后只需检查变量是否为NULL,如果是,则插入一个新行

Alter PROCEDURE TaskSave
(
@taskid int = NULL,   
@ProjectId int,
@EmployeeId int,
@TaskName nvarchar(50),
@Duration_Hrs int,
@StartDate nvarchar(20),
@FinishDate nvarchar(20),
@CreateUserId int,
@CreatedDate nvarchar(20),
@ModifiedUserID int,
@ModifiedDate nvarchar(20),
@Is_CommonTask bit
) AS

BEGIN

    IF @taskid IS NULL
    BEGIN
        INSERT TblTasks
        VALUES (@ProjectId,@EmployeeId,@TaskName,@Duration_Hrs,
                @StartDate,@FinishDate,@CreateUserId,@CreatedDate,
                @ModifiedUserID,@ModifiedDate,@Is_CommonTask)
    END
    ELSE
    BEGIN
        UPDATE TblTasks SET 
        StartDate=@StartDate,FinishDate=@FinishDate,
        Duration_Hrs=@Duration_Hrs 
        WHERE TaskId=@TaskId
    END


END
GO

答案 2 :(得分:0)

@taskid参数声明为NULL。如果它为null则插入else更新。见下文。

Alter PROCEDURE TaskSave
(
@taskid int =NULL,   
@ProjectId int,
@EmployeeId int,
@TaskName nvarchar(50),
@Duration_Hrs int,
@StartDate nvarchar(20),
@FinishDate nvarchar(20),
@CreateUserId int,
@CreatedDate nvarchar(20),
@ModifiedUserID int,
@ModifiedDate nvarchar(20),
@Is_CommonTask bit
) AS

BEGIN
  if @taskid is null
  BEGIN
        INSERT TblTasks
        VALUES (@ProjectId,@EmployeeId,@TaskName,@Duration_Hrs,
                @StartDate,@FinishDate,@CreateUserId,@CreatedDate,
                @ModifiedUserID,@ModifiedDate,@Is_CommonTask)
    END
  ELSE
    BEGIN
        UPDATE TblTasks SET 
        StartDate=@StartDate,FinishDate=@FinishDate,
        Duration_Hrs=@Duration_Hrs 
        WHERE TaskId=@taskid
    END
END
GO

答案 3 :(得分:0)

在这些情况下,我曾经创建了一个能够插入,更新和删除项目的通用存储过程。一般模式看起来像这样

create procedure Modify_MyTable
  @Action char(1),
  @Data int,
  @PK int output
as
  if @Action = 'I' begin -- Insert
    insert into MyTable (Data) values (@Data)
    set @PK = Scope_Identity()
  end
  if @Action = 'M' begin -- Modify
    update MyTable set Data = @Data where PKID = @PK
  end
  if @Action = 'D' begin -- Delete
    delete MyTable where PKID = @PK
  end

很久以前,当我使用它时,我发现它非常方便,因为我在一个SP中拥有所有操作代码(当然我可以使用三个)并且还可以添加日志记录功能和其他基本逻辑这个程序。

我并不是说这仍然是最好的方法,但它应该显示基本逻辑。