Question

how to write a if else statement to insert query for showing the error in stored procedure

below is my stored procedure.I want to show a error message when already inserted student_id is insert again..Student_id is primary key so its show error in my code but i dono how to get that error and show ….how to do friends plz help me…..

ALTER PROCEDURE [dbo].[spinsertstudentapplication] 
    -- Add the parameters for the stored procedure here
    @Student_id             nvarchar(50),   
    @Select_Country         nvarchar(50),
    @Select_State           nvarchar(50),
    @Select_Franchise       nvarchar(50),
    @Select_Sensei          nvarchar(50),
    @Enter_Student_Name     nvarchar(50),
    @Enter_Student_Address  nvarchar(50),
    @Students_Father_Name   nvarchar(50),
    @Student_DOB            datetime,
    @Gender                 bit,
    @Group                  nvarchar(50),
    @Enter_Kyu              nvarchar(50)
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here 
    insert into StudentApplication(Student_id,Select_Country,Select_State,Select_Franchise,Select_Sensei,Enter_Student_Name,Enter_Student_Address,Students_Father_Name,Student_DOB,Gender,[Group],Enter_Kyu)values(@Student_id,@Select_Country,@Select_State,@Select_Franchise,@Select_Sensei,@Enter_Student_Name,@Enter_Student_Address,@Students_Father_Name,@Student_DOB,@Gender,@Group,@Enter_Kyu)

END

Answer 1

You can add an output parameter(int/bit) in Sp and set value to that parameter whether record exist or not. Then you can check the output parameter value in Front End. Below I’ve added an output parameter @RecordExist as bit and setting the value 1 when record already exists otherwise setting 0. In front end you can get the Parameter value from SqlCommand after executing the Sp. (SqlCommand.Parameters["@RecordExist"].Value)

ALTER PROCEDURE [dbo].[spinsertstudentapplication]   
    -- Add the parameters for the stored procedure here  
    @Student_id             nvarchar(50),     
    @Select_Country         nvarchar(50),  
    @Select_State           nvarchar(50),  
    @Select_Franchise       nvarchar(50),  
    @Select_Sensei          nvarchar(50),  
    @Enter_Student_Name     nvarchar(50),  
    @Enter_Student_Address  nvarchar(50),  
    @Students_Father_Name   nvarchar(50),  
    @Student_DOB            datetime,  
    @Gender                 bit,  
    @Group                  nvarchar(50),  
    @Enter_Kyu              nvarchar(50),
    @RecordExist            bit output  -- newly added parameter
 AS  
 BEGIN  
     -- SET NOCOUNT ON added to prevent extra result sets from
     -- interfering with SELECT statements.
     SET NOCOUNT ON;

     -- Insert statements for procedure here 

If Exists (Select * from StudentApplication where Student_id = @Student_id)
   Begin
      Select @RecordExist = 1
      return
   End

Else
  Begin
      insert into StudentApplication (Student_id, Select_Country, Select_State,  Select_Franchise, Select_Sensei, Enter_Student_Name, Enter_Student_Address, Students_Father_Name, Student_DOB, Gender, [Group], Enter_Kyu)

      Select @Student_id, @Select_Country, @Select_State, @Select_Franchise, @Select_Sensei, @Enter_Student_Name, @Enter_Student_Address, @Students_Father_Name, @Student_DOB, @Gender, @Group, @Enter_Kyu

      Select @RecordExist = 0
      return
  End

END