ADO.NET Provider for SAP ByDesign

Build 21.0.7930

Querying with the DataReader

The CData ADO.NET Provider for SAP ByDesign implements two ADO.NET interfaces you can use to retrieve data from SAP ByDesign: SAPByDesignDataAdapter and SAPByDesignDataReader objects. Whereas SAPByDesignDataAdapter objects retrieve a single result set of all the data that matches a query, SAPByDesignDataReader objects fetch data in subset increments as needed.

Using the SAPByDesignDataReader

The SAPByDesignDataReader retrieves data faster than the SAPByDesignDataAdapter because it can retrieve data in pages. As you read data from the SAPByDesignDataReader, it periodically requests the next page of results from the data source, if required. This causes results to be returned at a faster rate. The following example selects all the columns from the Account table:


string connectionString = "URL=;User=username;Password=password;CustomService=servicename;";

using (SAPByDesignConnection connection = new SAPByDesignConnection(connectionString)) {
  SAPByDesignCommand cmd = new SAPByDesignCommand("SELECT * FROM Account", connection);
  SAPByDesignDataReader rdr = cmd.ExecuteReader();

  while (rdr.Read()) {
    Console.WriteLine(String.Format("\t{0} --> \t\t{1}", rdr["Id"], rdr["Name"]));


Dim connectionString As String = "URL=;User=username;Password=password;CustomService=servicename;"

Using connection As New SAPByDesignConnection(connectionString)
  Dim cmd As New SAPByDesignCommand("SELECT * FROM Account", connection)

  Dim rdr As SAPByDesignDataReader = cmd.ExecuteReader()

  While rdr.Read()
    Console.WriteLine([String].Format(vbTab & "{0} --> " & vbTab & vbTab & "{1}", rdr("Id"), rdr("Name")))
  End While
End Using

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Build 21.0.7930