Question

I have a table called Town which holds a relation between player and a players buildings. The table has the these Columns:
userid (int)
buildingid (int)
number (int)

I have successfully inserted a new building for a player and now i have trouble updating the specific row for a player.

I have this code:

if (!existPlayerBuilding(userid, buildingid))
            {
                SqlConnection sqlcon = new SqlConnection(connectionString);
                string query = "INSERT INTO Town VALUES(@userid, @buildingid, @number)";
                SqlCommand sqlcom = new SqlCommand(query, sqlcon);

                sqlcom.Parameters.Add("@userid", userid);
                sqlcom.Parameters.Add("@buildingid", buildingid);
                sqlcom.Parameters.Add("@number", number);

                try
                {
                    sqlcon.Open();
                    sqlcom.ExecuteNonQuery();
                    sqlcon.Close();
                }
                catch (Exception i)
                {
                    lblTestlabel.Text = "SQL FEILET";
                }
                lblTestlabel.Text = "Bygningen ble kjøpt!!!!";
            }
            else
            {
                SqlConnection sqlcon = new SqlConnection(connectionString);
                string query = "UPDATE Town VALUES(@userid, @buildingid, @number) WHERE userid = @userid AND buildingid = @buildingid";
                SqlCommand sqlcom = new SqlCommand(query, sqlcon);

                sqlcom.Parameters.Add("@userid", userid);
                sqlcom.Parameters.Add("@buildingid", buildingid);
                sqlcom.Parameters.Add("@number", number);

                try
                {
                    sqlcon.Open();
                    sqlcom.ExecuteNonQuery();
                    sqlcon.Close();
                }
                catch (Exception i)
                {
                    lblTestlabel.Text = "SQL FEILET";
                }
                lblTestlabel.Text = "Bygningen ble kjøpt!!!!";
            }

The existPlayerBuilding method returns true if a player already has a building with the given id and false otherwise. When i run and test if i can update a number for a users building nothing happens.

Answer 1

The syntax for an Update in SQL would be

UPDATE Town
SET number = @number 
WHERE userid = @userid AND buildingid = @buildingid