GetValues Method (UniDataReader)

In This Topic

Syntax
Remarks
Example
Requirements
See Also

Gets all attribute columns in the collection for the current row.

Syntax

Visual Basic
C#

public override int GetValues( 
   object[] values
)

'Declaration
 
Public Overrides Function GetValues( _
   ByVal values() As Object _
) As Integer

Parameters

values: An array of System.Object into which to copy the attribute columns.

Return Value

The number of instances of System.Object in the array.

Remarks

For most applications, the GetValues method provides an efficient means for retrieving all columns, rather than retrieving each column individually.

You can pass an System.Object array that contains fewer than the number of columns contained in the resulting row. Only the amount of data the System.Object array holds is copied to the array. You can also pass an System.Object array whose length is more than the number of columns contained in the resulting row.

This method returns System.DBNull for null database columns.

Example

The example shows how to retrieve several fields at once. Note that only the first three fields are retrieved, though there may be more in the table.

csharp

public void GetObjects(UniConnection myConnection)
{
  UniCommand cmd = new UniCommand("SELECT * FROM Test.Emp");
  cmd.Connection = myConnection;
  myConnection.Open();
  try
  {
    UniDataReader reader = cmd.ExecuteReader();
    reader.Read();
    object[] objs = new object[3];
    int quant = reader.GetValues(objs);
    for (int i=0;i < quant;i++)
    {
      Console.WriteLine(objs[i]);
    }
    reader.Close();
  }
  finally
  {
    myConnection.Close();
  }
}

Visual Basic

Public Sub GetObjects(ByVal myConnection As UniConnection)
  Dim cmd As UniCommand = New UniCommand("SELECT * FROM Test.Dept")
  cmd.Connection = myConnection
  myConnection.Open()
  Try
    Dim reader As UniDataReader = cmd.ExecuteReader()
    reader.Read()
    Dim objs(3) As Object
    Dim quant As Integer = reader.GetValues(objs)
    Dim i As Integer
    For i = 0 To quant - 1
      Console.WriteLine(objs(i))
    Next i
    reader.Close()
  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

Reference

UniDataReader Class
UniDataReader Members
GetValue Method

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