Read Method (PgSqlDataReader)

In This Topic

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

While the PgSqlDataReader is in use, the associated PgSqlConnection is busy serving it until you call Close.

Example

The following example creates a PgSqlConnection, a PgSqlCommand, and a PgSqlDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the PgSqlDataReader, then the PgSqlConnection.

csharp

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

Visual Basic

Public Sub ReadMyData(myConnString As String)
  Dim mySelectQuery As String = "SELECT DeptNo, DName FROM Test.Dept"
  Dim pgConnection As New PgSqlConnection(myConnString)
  Dim pgCommand As New PgSqlCommand(mySelectQuery, pgConnection)
  pgConnection.Open()
  Dim pgReader As PgSqlDataReader
  pgReader = pgCommand.ExecuteReader()
  ' Always call Read before accessing data.
  While pgReader.Read()
    Console.WriteLine(pgReader.GetInt32(0).ToString() + ", " _
      + pgReader.GetString(1))
  End While
  ' always call Close when done reading.
  pgReader.Close()
  ' Close the connection when done with it.
  pgConnection.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

PgSqlDataReader Class
PgSqlDataReader Members
PgSqlConnection Class
PgSqlCommand Class

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