Read Method (SqlDataReader)

In This Topic

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

While the SqlDataReader is in use, the associated SqlConnection is busy serving it until you call Close.

Example

The following example creates a SqlConnection, a SqlCommand, and a SqlDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the SqlDataReader, then the SqlConnection.

csharp

public void ReadMyData(string myConnString)
{
  string mySelectQuery = "SELECT DeptNo, DName FROM Test.Dept";
  SqlConnection myConnection = new SqlConnection(myConnString);
  SqlCommand myCommand = new SqlCommand(mySelectQuery,myConnection);
  myConnection.Open();
  SqlDataReader 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 SqlConnection(myConnString)
  Dim myCommand As New SqlCommand(mySelectQuery, myConnection)
  myConnection.Open()
  Dim myReader As SqlDataReader
  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

Reference

SqlDataReader Class
SqlDataReader Members
SqlConnection Class
SqlCommand Class

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