stored procedure with insert & update using identity column

Question

I have a table called 'tasks' in that 'task id' is identity column, for that table I have to write save stored procedure, in which when 'task id' is not given it should insert the values and when 'task id' is given it should update the table.

how can this achievable when task id is identity column could anyone explain with example. here is the code

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

Solution

First of all, give your input variable TaskID a default value like below, then simply check to see if the variable is NULL, if so, insert a new row

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