when I insert a record into the database that record is already exist means how to convey that information by the message display?

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when I insert a record into the database that record is already exist means how to convey that information by the message display?
Now I add the primary key for the Reg.No, I already insert the Reg.No"123", then I insert again one more time means that time I convey this message "Already Exist" by the message box. How can I do it? Please Help me, Friend....!

Posted 15-Apr-14 18:26pm

Member 10624163

Updated 15-Apr-14 18:27pm

v2

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Schatak · Answer 1 · 2014-04-15T19:58:00

First , if its primary key you need not to insert any value for it, but if any other than that you need to check then you can make a check into database itself.
In database side:

SQL

CREATE PROCEDURE Sb_inserupdate
(
	@Idcol int --your column
)
AS
BEGIN
	IF EXISTS (SELECT 1 FROM yourtable WHERE Idcol = @Idcol)
        SELECT 0 --means record exists
    ELSE
        --insert query to insert record
        SELECT 1
END
GO

Coding side:

C#

using (SqlConnection con = new SqlConnection(constr))// your connection
{
SqlCommand cmd = new SqlCommand();
    cmd.CommandText = "Sb_inserupdate";
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@Idcol", clientID);
Int32 val = Convert.ToInt32(cmd.ExecuteScalar());
if (val ==0)
{
	//show msg record exists;
}
else
{
	//next action
}

Tom Marvolo Riddle · Answer 2 · 2014-04-15T18:33:00

Solution 1

Try this:

C#

SqlCommand cmd = new SqlCommand(queryhere, con);//use parameterized query
 SqlDataReader  dr=cmd.ExecuteReader();
   dr.Read();
   if (dr.HasRows)
   {
       dr.Close();
     ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('Already Exists!..')", true);
   }
   else
   {
   //insert query here
   }

Posted 15-Apr-14 18:33pm

Tom Marvolo Riddle

Updated 15-Apr-14 19:05pm

v3

Comments

Member 10624163 16-Apr-14 0:52am

can you give the detailed solution for this friend?

Tom Marvolo Riddle 16-Apr-14 1:00am

we're ready to help you .will you please explain what you need more than this?

gouravkumar123 · Answer 3 · 2014-04-15T19:12:00

Solution 2

You can check the record exist or not before insert the new record.

C#

string sql = "select * from tablename where regno='" + txtRegNo.Text +"'";

database db = new DataBase();
 result = (int) db.GetScalar(sql);
if(result > 0)
{
Show Message
}
else
{
insert new record
}

Posted 15-Apr-14 19:12pm

gouravkumar123