Read Method (UniDataReader)

In This Topic

Advances the UniDataReader to the next record.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides Function Read() As Boolean

public override bool Read()

Return Value

true if there are more rows; otherwise, false.

Remarks

The default position of the UniDataReader is prior to the first record. Therefore, you must call Read to begin accessing any data.

While the UniDataReader is in use, the associated UniConnection is busy serving it until you call Close.

Example

The following example creates a UniConnection, a UniCommand, and a UniDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the UniDataReader, then the UniConnection.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Test.Dept";
  UniConnection myConnection = new UniConnection(myConnString);
  UniCommand myCommand = new UniCommand(mySelectQuery,myConnection);
  myConnection.Open();
  UniDataReader myReader;
  myReader = myCommand.ExecuteReader();
  // Always call Read before accessing data.
  while (myReader.Read()) {
    Console.WriteLine(myReader.GetInt32(0) + ", " + myReader.GetString(1));
  }
  // always call Close when done reading.
  myReader.Close();
  // Close the connection when done with it.
  myConnection.Close();
}

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Test.Dept"
  Dim myConnection As New UniConnection(myConnString)
  Dim myCommand As New UniCommand(mySelectQuery, myConnection)
  myConnection.Open()
  Dim myReader As UniDataReader
  myReader = myCommand.ExecuteReader()
  ' Always call Read before accessing data.
  While myReader.Read()
    Console.WriteLine(myReader.GetInt32(0).ToString() + ", " _
      + myReader.GetString(1))
  End While
  ' always call Close when done reading.
  myReader.Close()
  ' Close the connection when done with it.
  myConnection.Close()
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
UniConnection Class
UniCommand Class

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