ExecuteReader() Method

In This Topic

Sends the CommandText to the Connection and builds a SqlDataReader.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shadows Function ExecuteReader() As SqlDataReader

public new SqlDataReader ExecuteReader()

Return Value

A SqlDataReader object.

Remarks

When Devart.Data.SqlServer.SqlCommand.FetchAll property is false the following restriction takes place. While the SqlDataReader is in use, the associated SqlConnection is busy serving the SqlDataReader. While in this state, no operations can be performed on the SqlConnection except closing. This is the case until the Close method of the SqlDataReader is called.

Example

The following example creates a SqlCommand, then executes it by passing a string that is SQL SELECT statement, and a string to use to connect to the data source.

csharp

public void CreateSqlDataReader(string mySelectQuery,string myConnectionString)
{
  SqlConnection myConnection = new SqlConnection(myConnectionString);
  SqlCommand myCommand = new SqlCommand(mySelectQuery, myConnection);
  myCommand.Connection.Open();
  SqlDataReader myReader = myCommand.ExecuteReader();
  try
  {
    while(myReader.Read())
    {
      Console.WriteLine(myReader.GetString(0));
    }
  }
  finally
  {
    myReader.Close();
    myConnection.Close();
  }
}

Visual Basic

Public Sub CreateSqlDataReader(mySelectQuery As String, _
myConnectionString As String)
  Dim myConnection As New SqlConnection(myConnectionString)
  Dim myCommand As New SqlCommand(mySelectQuery, myConnection)
  myCommand.Connection.Open()
  Dim myReader As SqlDataReader = myCommand.ExecuteReader()
  Try
    While myReader.Read()
      Console.WriteLine(myReader.GetString(0))
    End While
  Finally
    myReader.Close()
    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

SqlCommand Class
SqlCommand Members
Overload List
SqlDataReader Class
SqlConnection Class

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