RecordsAffected Property (MySqlDataReader)

In This Topic

Gets the number of rows changed, inserted, or deleted by execution of the SQL statement.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides ReadOnly Property RecordsAffected As Integer

public override int RecordsAffected {get;}

Property Value

The number of rows changed, inserted, or deleted. -1 for SELECT statements; 0 if no rows were affected, or the statement failed.

Remarks

The value of this property is not cumulative. For example, if two records are inserted in the first statement in batch mode, and the second statement affected 3 records, the value of RecordsAffected will be 3.

System.Data.Common.DbDataReader.IsClosed and RecordsAffected are the only properties that you can call after the MySqlDataReader is closed.

Example

This sample shows how to find out how many rows have been affected during last query. You can do it even if the MySqlDataReader has been closed.

csharp

public void ProcessReader (MySqlDataReader myReader)
{
  if (!myReader.IsClosed)
  {
    while (myReader.Read())
    {
      for (int i=0;i<myReader.FieldCount;i++)
      {
        Console.Write("\t"+myReader[i]);
      }
      Console.WriteLine();
    }
  }
  else
  {
    Console.WriteLine("The DataReader is closed. Rows affected in last action: "+myReader.RecordsAffected);
  }
}

Visual Basic

Public Sub ProcessReader(ByVal myReader As MySqlDataReader)
  If Not myReader.IsClosed Then
    Dim i As Integer
    While myReader.Read()
      For i = 0 To myReader.FieldCount - 1
        Console.Write(" " & myReader(i))
      Next i
      Console.WriteLine()
    End While
  Else
    Console.WriteLine("The DataReader is closed. Rows affected in last action: " & myReader.RecordsAffected)
  End If
End Sub

Reference

MySqlDataReader Class
MySqlDataReader Members

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