How to show message box for record already exits

Question

1.00/5 (1 vote)

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my store procedure is

SQL

CREATE PROCEDURE [dbo].[Usp_Insert_Data_In_Student_Detial_Table]
(
	@ROLLNUMBER int,
	@NAME varchar(50)
)

AS
		IF EXISTS (SELECT '#' FROM Student_Detail WHERE NAME = @NAME)
		BEGIN
				SELECT 'SORRY'
		END

		ELSE

		
		BEGIN
				
				INSERT INTO Student_Detail
					
						(
							ROLLNUMBER,
							NAME
						)
				VALUES
				
						(
							@ROLLNUMBER,
							@NAME
						)
				
		END

my save button code is

C#

private void Sumbit_Button_Click(object sender, EventArgs e)
        {
            using (SqlConnection con = new SqlConnection(cs))
            {
                using (SqlCommand cmd = new SqlCommand("Usp_Insert_Data_In_Student_Detial_Table", con))
                {
                    cmd.Parameters.AddWithValue("@ROLLNUMBER", rollNumberTextBox.Text);
                    cmd.Parameters.AddWithValue("@NAME", nameTextBox.Text);
                    cmd.CommandType = CommandType.StoredProcedure;
                    con.Open();
                    int a = cmd.ExecuteNonQuery();
                    if(a>0)
                    {
                        MessageBox.Show("DATA SAVE SUCESSSFULLY");

                    }

                    
                }
            }

        }

my problem is how to show message box when record already exits

What I have tried:

i have search many posts for resolve this problem but cant find it. show please help me

Posted 25-Apr-23 18:38pm

kalpeshdelta

Updated 27-Apr-23 5:17am

OriginalGriff

v2

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Comments

GKP1992 26-Apr-23 4:02am

You should refer to C# manual about how an if-else block works and what it can be used for. Try to see if it can be applied to your problem.

kalpeshdelta 26-Apr-23 9:08am

where add the two line code

2 solutions

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OriginalGriff · Answer 1 · 2023-04-25T19:13:00

Solution 1

Firstly "Detail" is spelled incrorrectly: "Usp_Insert_Data_In_Student_Detial_Table" is wrong - but that's minor.

Check the return value: Instead of "SORRY", I'd return a the number of rows inserted: 0 for "It exists" and 1 for "Inserted"

SQL

IF EXISTS ...
   BEGIN
   SELECT 0
   END
ELSE
   BEGIN
   ...
   SELECT 1
   END

Then your C# code just needs an else clause.

Posted 25-Apr-23 19:13pm

OriginalGriff

Comments

kalpeshdelta 26-Apr-23 1:38am

but what is code i write to show message box "record already exits when button click event

OriginalGriff 26-Apr-23 2:09am

You are kidding, right?
You wrote the C# code and you can't modify it to add two lines of code, one of which is a single word, and the other is nearly identical to teh code you have already?

Is this a trolling session?

GKP1992 26-Apr-23 4:03am

He could just be that dense.

mtoha · Answer 2 · 2023-04-27T05:17:00

You can try to change your SP with IF NOT EXIST:

CREATE PROCEDURE [dbo].[Usp_Insert_Data_In_Student_Detial_Table]
(
	@ROLLNUMBER int,
	@NAME varchar(50)
)

AS
		IF NOT EXISTS (SELECT '#' FROM Student_Detail WHERE NAME = @NAME)
		BEGIN
				
				
				INSERT INTO Student_Detail
					
						(
							ROLLNUMBER,
							NAME
						)
				VALUES
				
						(
							@ROLLNUMBER,
							@NAME
						)

             select 1 as DataExist
				
		END
        ELSE
		BEGIN
              select 0 as DataExist
		END

If result DataExistis 0, show message box That data already exist

OR You can separate the query between checking duplicate and save operation something like this:

string sQuery = string.Empty;
            try
            {
				int iTotal = 0;
				int iResultSave = 0;
                sQuery = @"SELECT count(*) TOTAL FROM Student_Detail WHERE NAME = @NAME";


                using (SqlConnection con = new SqlConnection(CommonConst.Conn_String_MS_SQL_SERVER))
                {
                    con.Open();
                    using (SqlCommand cmd = new SqlCommand(sQuery, con))
                    {
						cmd.Parameters.AddWithValue("@NAME", nameTextBox.Text);
						using (SqlDataReader dr = cmd.ExecuteReader())
                        {
                            if (dr != null)
                            {
                                while (dr.Read())
                                {
									iTotal = Convert.ToInt32(dr["TOTAL "]);
                                }
                            }
                        } // reader closed and disposed up here
                    } // command disposed here
                } //connection closed and disposed here
				
				
				if(iTotal <= 0){
				
                sQuery = @"INSERT INTO Student_Detail
					
						(
							ROLLNUMBER,
							NAME
						)
				VALUES
				
						(
							@ROLLNUMBER,
							@NAME
						)";
				 using (SqlConnection con = new SqlConnection(CommonConst.Conn_String_MS_SQL_SERVER))
                {
                    con.Open();
                    using (SqlCommand cmd = new SqlCommand(sQuery, con))
                    {                   
						cmd.Parameters.AddWithValue("@ROLLNUMBER", rollNumberTextBox.Text);
						cmd.Parameters.AddWithValue("@NAME", nameTextBox.Text);
                        iResultSave = cmd.ExecuteNonQuery();
                    } // command disposed here
                } //connection closed and disposed here

				}else{                        
						MessageBox.Show("Data Already Exist");	
					}
				
				} catch(Exception ex){
					//insert log sned message
				}