Adapting Ch. 20 code, to create a 'SELECT' DataSet ?

liamfitz · July 3rd, 2009, 06:20 PM

I'm using the following code to crete a new dataset, which then repopulates a DataGridView, based on an 'Add Query' DataSet ( creted using the wizard ). I'd like to know the underlying code, so I can slightly adapt it in a sub-routine. For example

Private Sub btnWhatever_Click( ..................................... and so on )

create connection to DB
create an SQL command with (?) in appropriate WHERE clause.
pass the parameter(s) to the command.
execute the command.
fill the DataGridView with new DataSet
close connection

End Sub()

Code:


PrivateSub btnABig_Click(ByVal sender AsObject, ByVal e As System.EventArgs)_ & Handles btnABig.Click
 
Try
Me.CustomersTableAdapter.initA(Me.Bm2009Customers.Customers)
Catch ex As System.Exception
System.Windows.Forms.MessageBox.Show(ex.Message)
EndTry
EndSub

In Ch. 20 there's only examples for non-query routines. Any help much appreciated.

MuhammadShahid · July 7th, 2009, 10:56 AM

Hi ,

If you are using Wizard to create a DataSet and Tables Adapter use the following code to fill the corresponding tables.

Code:

DataSet1 ds1 = new DataSet1();
AnyTableAdapter ata = new AnyTableAdapter();
ata.Fill(ds1.anyTable);

In any other case if u try to fill programmatic ally use the following methods fill by procedure and fill by Query.

Return DataTable fill by Query method

Code:

 public DataTable RunSelectQuery(string sqlQuery, OracleParameter[] @params)
        {
            OracleDataAdapter objDataAdapter = default(OracleDataAdapter); ;
            DataTable dt = new DataTable();
            try
            {
                OpenConnection();
                OracleCommand cmd = new OracleCommand(sqlQuery, dbConnection);
                cmd.CommandType = CommandType.Text;
                objDataAdapter = new OracleDataAdapter(cmd);               
                ResolveParameters(ref cmd, @params);
                objDataAdapter.Fill(dt);
            }
            catch (Exception oErr)
            {               
                throw oErr;
            }
            finally
            {
                CloseConnection();
                if ((objDataAdapter != null)) objDataAdapter.Dispose();
            }
            return dt;
        }

Return DataSet fill By procedure

Code:

 public DataSet FillDataSetWithProcedure(string spName, OracleParameter[] @params)
        {
            DataSet returnDs = new DataSet();
            OracleDataAdapter da = new OracleDataAdapter();
            OracleCommand cmd = new OracleCommand();
            try
            {
                OpenConnection();
                cmd = new OracleCommand(spName, dbConnection);
                cmd.CommandType = CommandType.StoredProcedure;             
                ResolveProcParameters(ref cmd, @params);
                da = new OracleDataAdapter(cmd);
                da.Fill(returnDs);
            }
            catch (Exception ex)
            {               
                throw ex;
            }
            finally
            {
                CloseConnection();
                if ((da != null)) da.Dispose();
                if ((cmd != null)) cmd.Dispose();
            }

            return returnDs;
        }

The return data Source assigned to specified DataGridView to fill the record.

The above code return in C# supported by Oracle Data Access . if you need any further help let me know about it.