Replace dataadapter by sql datareader

Posted on 2016-08-15
Last Modified: 2016-08-16
Is there any way I can replace the data adapter with sql reader to fill datatable.

 Dim SQLobj As New SqlCommand("L_Sy")
  SQLobj.Parameters.AddWithValue("@Title", Dy_Title)
            SQLobj.Parameters.AddWithValue("@Year_Ref1", Dy_Year_Ref1)
            SQLobj.Parameters.AddWithValue("@Year_Ref2", Dy_Year_Ref2)
            SQLobj.Parameters.AddWithValue("@FaxNumber", Dy_FaxNumber)
            SQLobj.Parameters.AddWithValue("@Attn", Dy_Attn)

    SQLobj.CommandType = CommandType.StoredProcedure
            SQLobj.Connection = sql.GetConnection

  Public Sub Populate(ByVal Command As SqlCommand)
        'Accept command as string and fill the datatable with the result of sql query
        ' Test_Str = "Test"
        Dim dt = New DataTable
            adapter = New SqlDataAdapter()
            adapter.SelectCommand = Command
            Data_Table = dt

        Catch MyException As SqlException
            MessageBox.Show("Stored procedure Error: MySQL code: " &
            MyException.Number & "  " &
        End Try
    End Sub
Question by:RIAS
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LVL 44

Expert Comment

ID: 41756442
Yes.  For each row in the reader add a new row to the data table and copy the contents of each field from the reader into the equivalent field in the new row in the table.

ps.  This is rather more code for you to write an could possibly run more slowly as well.

Author Comment

ID: 41756450
I read an article which prompts it will be faster:

var dataReader = cmd.ExecuteReader();
var dataTable = new DataTable();

Author Comment

ID: 41756452
Need to know how I can implement here.
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LVL 44

Expert Comment

ID: 41756471
You're right.  The Load method can use a datareader as the source (guess who hasn't ever done that).
In that case it is probably faster than using an adapter (a datareader is a lightweight class supporting limited functionality) but make certain the table and reader do match one another in terms of the columns of data.
LVL 44

Accepted Solution

AndyAinscow earned 500 total points
ID: 41756476

Author Comment

ID: 41756507
Any suggestion in my code

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