Dataset does not reflect new primary key after insert

Question

This is my first question here and please excuse me with this presenting style.

I have a MySQL table categories with following columns:

• c_id ( auto-increment )
• c_code
• c_name

Here is what I am trying to do;

• dataset contains one table - categories
• add a row to dataset (new category)
• update database using mysqldataadaptor 's update() method
• view dataset entries in a datagridview

Problem is after I insert new row, my dataset's relevant row does not show the last inserted primary key (auto-generated one). But it shows the values.

This is the code where I add new row

var dr = ds.Tables["categories"].NewRow();
    dr["c_code"] = "tst123";
    dr["c_name"] = "123tdt";
ds.Tables["categories"].Rows.Add(dr);

This is the code where I update database

adp.Update(ds.Tables[tempTableName]);

and finally this is how I view the dataset SOON AFTER above line

dataGridView1.DataSource = ds.Tables["categories"];

PROBLEM:
In the gridview only c_code and c_name appear there.

How do I get the last inserted id to dataset?

Answer 1

I would guess you have to do a new adp.Fill(ds) to get the ID. You only provide c_code and c_name. Hence, c_code and c_name are the only columns filled in the grid. adp.Update updates your database, it does not reload the entire dataset after an update for obvious reasons.

Answer 2

This is what worked for me: It is in VB but you can see what is going on.

mySQLdataAdapter.Update(myDataSet, table)
mySQLcommand.CommandText = "Select Last_Insert_ID();"
lastInsertID = dc.ExecuteScalar()

Running this code right after the mysql adapter update provides the last inserted ID for even though i am using a dataset.

Answer 3

You can use the RowUpdated event of the DataAdapter to query the last inserted ID and update the current row:

...
adp.RowUpdated += DataAdapter_RowUpdated; // Add this once to your DataAdapter
adp.Update(ds.Tables[tempTableName]);
...

private void DataAdapter_RowUpdated(object sender, MySqlRowUpdatedEventArgs e)
{
  if (e.StatementType == StatementType.Insert)
  {
     string sql = "select last_insert_id()";
     MySqlCommand cmd = new MySqlCommand(sql, e.Command.Connection);
     e.Row["c_id"] = cmd.ExecuteScalar();
  }
}