HasRows Property (DB2DataReader)
Gets a value indicating whether the
DB2DataReader contains one or more rows.
public override bool HasRows {get;}
'Declaration
Public Overrides ReadOnly Property HasRows As Boolean
Property Value
true if the
DB2DataReader contains one or more rows; otherwise,
false.
This sample shows how to optimize reading from a data source using
HasRows property.
public void FetchResults(DB2Connection db2Connection)
{
DB2Command cmd = new DB2Command("SELECT * FROM Dept");
cmd.FetchSize = 100;
cmd.Connection = db2Connection;
db2Connection.Open();
try
{
DB2DataReader 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
{
db2Connection.Close();
}
}
Public Sub FetchResults(ByVal db2Connection As DB2Connection)
Dim cmd As DB2Command = New DB2Command("SELECT * FROM Dept")
cmd.FetchSize = 100
cmd.Connection = db2Connection
db2Connection.Open()
Try
Dim reader As DB2DataReader = 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
db2Connection.Close()
End Try
End Sub
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