HasRows Property (UniDataReader)

In This Topic

Gets a value indicating whether the UniDataReader contains one or more rows.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides ReadOnly Property HasRows As Boolean

public override bool HasRows {get;}

Property Value

true if the UniDataReader 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.

csharp

public void FetchResults(UniConnection uniConnection)
{
  UniCommand cmd = new UniCommand("SELECT * FROM Test.Dept");
  cmd.FetchSize = 100;
  cmd.Connection = uniConnection;
  uniConnection.Open();
  try
  {
    UniDataReader 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
  {
    uniConnection.Close();
  }
}

Visual Basic

Public Sub FetchResults(ByVal uniConnection As UniConnection)
  Dim cmd As UniCommand = New UniCommand("SELECT * FROM Test.Dept")
  cmd.FetchSize = 100
  cmd.Connection = uniConnection
  uniConnection.Open()
  Try
    Dim reader As UniDataReader = 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
    uniConnection.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

Reference

UniDataReader Class
UniDataReader Members

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