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Devart.Data.MySql Namespace / MySqlDataReader Class / HasRows Property
Example

HasRows Property (MySqlDataReader)
Gets a value indicating whether the MySqlDataReader contains one or more rows.
Syntax
'Declaration
 
Public Overrides ReadOnly Property HasRows As Boolean
 

Property Value

true if the MySqlDataReader contains one or more rows; otherwise, false.
Remarks
Note that this property returns true even if all rows were read out.
Example
This sample shows how to optimize reading from a data source using HasRows property.
public void FetchResults(MySqlConnection myConnection)
{
  MySqlCommand cmd = new MySqlCommand("SELECT * FROM Test.Dept");
  cmd.FetchSize = 100;
  cmd.Connection = myConnection;
  myConnection.Open();
  try
  {
    MySqlDataReader reader = cmd.ExecuteReader();
    if (reader.HasRows)
    {
      while (reader.Read())
      {
        for (int i=0;i<reader.FieldCount;i++)
        {
          Console.Write("\t"+reader[i]);
        }
        Console.WriteLine();
      }
    }
    else
    {
      Console.WriteLine("No rows detected.");
    }
  }
  finally
  {
    myConnection.Close();
  }
}
Public Sub FetchResults(ByVal myConnection As MySqlConnection)
  Dim cmd As MySqlCommand = New MySqlCommand("SELECT * FROM Test.Dept")
  cmd.FetchSize = 100
  cmd.Connection = myConnection
  myConnection.Open()
  Try
    Dim reader As MySqlDataReader = cmd.ExecuteReader()
    If reader.HasRows Then
      While reader.Read()
        Dim i
        For i = 0 To reader.FieldCount - 1
          Console.Write(String.Concat(" ", reader(i)))
        Next i
        Console.WriteLine()
      End While
    Else
      Console.WriteLine("No rows detected.")
    End If
  Finally
    myConnection.Close()
  End Try
End Sub
Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also