ExecuteReader() Method

In This Topic

Sends the CommandText to the Connection and builds a MySqlDataReader.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shadows Function ExecuteReader() As MySqlDataReader

public new MySqlDataReader ExecuteReader()

Return Value

A MySqlDataReader object.

Remarks

When FetchAll property is false the following restriction takes place. While the MySqlDataReader is in use, the associated MySqlConnection is busy serving the MySqlDataReader. While in this state, no operations can be performed on the MySqlConnection except closing. This is the case until the Close() method of the MySqlDataReader is called.

Example

The following example creates a MySqlCommand, 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 CreateMySqlDataReader(string mySelectQuery,string myConnectionString)
{
  MySqlConnection myConnection = new MySqlConnection(myConnectionString);
  MySqlCommand myCommand = new MySqlCommand(mySelectQuery, myConnection);
  myCommand.Connection.Open();
  MySqlDataReader myReader = myCommand.ExecuteReader();
  try
  {
    while(myReader.Read())
    {
      Console.WriteLine(myReader.GetString(0));
    }
  }
  finally
  {
    myReader.Close();
    myConnection.Close();
  }
}

Visual Basic

Public Sub CreateMySqlDataReader(mySelectQuery As String, _
myConnectionString As String)
  Dim myConnection As New MySqlConnection(myConnectionString)
  Dim myCommand As New MySqlCommand(mySelectQuery, myConnection)
  myCommand.Connection.Open()
  Dim myReader As MySqlDataReader = 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

MySqlCommand Class
MySqlCommand Members
Overload List
MySqlDataReader Class
MySqlConnection Class

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