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Replace dataadapter by sql datareader

Posted on 2016-08-15
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Last Modified: 2016-08-16
Hello,
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
            clsFrmmain.Populate(SQLobj)



  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
        Try
            adapter = New SqlDataAdapter()
            adapter.SelectCommand = Command
            dt.BeginLoadData()
            adapter.Fill(dt)
            dt.EndLoadData()
            Command.Connection.Close()
            Command.Dispose()
            Data_Table = dt


        Catch MyException As SqlException
            MessageBox.Show("Stored procedure Error: MySQL code: " &
            MyException.Number & "  " &
            MyException.Message)
        End Try
    End Sub
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Question by:RIAS
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6 Comments
 
LVL 45

Expert Comment

by:AndyAinscow
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.
0
 

Author Comment

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

var dataReader = cmd.ExecuteReader();
var dataTable = new DataTable();
dataTable.Load(dataReader);
0
 

Author Comment

by:RIAS
ID: 41756452
Need to know how I can implement here.
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LVL 45

Expert Comment

by:AndyAinscow
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.
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LVL 45

Accepted Solution

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AndyAinscow earned 2000 total points
ID: 41756476
0
 

Author Comment

by:RIAS
ID: 41756507
Andy,
Any suggestion in my code
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