Question

Im Passing a querystring to my load page (ID)
and then trying to SELECT a column of that row (Status) so its eventually only one cell.

My goal is to take some Label(not a textbox) in the page that has some text, and place it in the “Status” cell.

this is my code :

this.conn = new SqlConnection(ConnString);
conn.Open();
string idIndex = Request.QueryString[“ID”];
string sqlquery1 = “INSERT INTO Movies (Status) VALUES (@Status)”;
string sqlquery2 = “SELECT Status FROM Movies WHERE ID=” + idIndex;

        cmd = new SqlCommand(sqlquery2, conn);
        adapter = new SqlDataAdapter(sqlquery2, conn);
        dt = new DataTable();
        adapter.Fill(dt);
        string data = "";

        foreach (DataRow dataRow in dt.Rows)
        {
            data = dataRow["Status"].ToString();
        }

        if (data == "")
        {
            string username = UserNameOrGuest.Text;
            cmd = new SqlCommand(sqlquery1, conn);
            cmd.Parameters.AddWithValue("Status", username);
            ErrorLabel.Text = "Movie rental succeeded!";
            cmd.ExecuteNonQuery();

        }
        else
        {
            ErrorLabel.Text = "The movie is already rented by somebody else.";
        }
    }

And I get an exception :

” Cannot insert the value NULL into column ‘Ganere’, table ‘Movie.dbo.Movies’; column does not allow nulls. INSERT fails.
The statement has been terminated.”

(“Ganere” its another column from the table, that I dont want it to pass.)

THanks for the helpers!

Answer 1

That’s not really how a table works. When inserting a record, that record needs to meet the data integrity criteria of the table. In this particular case, it sounds like the table has a required column. (It may even have more required columns and that’s just the first one it encountered in your query.)

Your options at this point are:

1. Insert a value into that column as well, either a dummy/default value or something real.
2. Alter the table to allow null in that column.
3. Alter the table to have a default value for that column when one isn’t supplied.