Read Method (DB2DataReader)

In This Topic

Advances the DB2DataReader 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 DB2DataReader is prior to the first record. Therefore, you must call Read to begin accessing any data.

While the DB2DataReader is in use, the associated DB2Connection is busy serving it until you call Close.

Example

The following example creates a DB2Connection, a DB2Command, and a DB2DataReader. The example reads through the data, writing it out to the console. Finally, the example closes the DB2DataReader, then the DB2Connection.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Dept";
  DB2Connection db2Connection = new DB2Connection(myConnString);
  DB2Command db2Command = new DB2Command(mySelectQuery,db2Connection);
  db2Connection.Open();
  DB2DataReader db2Reader;
  db2Reader = db2Command.ExecuteReader();
  // Always call Read before accessing data.
  while (db2Reader.Read()) {
    Console.WriteLine(db2Reader.GetInt32(0) + ", " + db2Reader.GetString(1));
  }
  // always call Close when done reading.
  db2Reader.Close();
  // Close the connection when done with it.
  db2Connection.Close();
}

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Dept"
  Dim db2Connection As New DB2Connection(myConnString)
  Dim db2Command As New DB2Command(mySelectQuery, db2Connection)
  db2Connection.Open()
  Dim db2Reader As DB2DataReader
  db2Reader = db2Command.ExecuteReader()
  ' Always call Read before accessing data.
  While db2Reader.Read()
    Console.WriteLine(db2Reader.GetInt32(0).ToString() + ", " _
      + db2Reader.GetString(1))
  End While
  ' always call Close when done reading.
  db2Reader.Close()
  ' Close the connection when done with it.
  db2Connection.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

DB2DataReader Class
DB2DataReader Members
DB2Connection Class
DB2Command Class

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