DeleteCommand Property (MySqlDataTable)

In This Topic

Gets or sets a MySQL statement to delete records from the data set.

Syntax

Visual Basic
C#

'Declaration
 
Public Shadows Property DeleteCommand As MySqlCommand

public new MySqlCommand DeleteCommand {get; set;}

Property Value

A MySqlCommand used during an update operation to delete records in the data source that correspond to deleted rows in the System.Data.DataSet.

Remarks

Typically you do not need to use DeleteCommand when working with MySqlDataTable. All simple update operations are performed automatically using embedded CommandBuilder. DeleteCommand enables you to perform specific operations like shown in the sample below.

DeleteCommand uses its own Connection if it is created. Otherwise DeleteCommand uses Connection.

Example

This sample shows how to modify and display data using MySqlDataTable.

csharp

public void UseDataTable(MySqlConnection myConnection)
{
  MySqlDataTable myDataTable = new MySqlDataTable("SELECT * FROM Test.Dept", myConnection);
  try
  {
    myDataTable.Active = true;
    myDataTable.Rows[1].Delete();
    myDataTable.DeleteCommand = new MySqlCommand("DELETE FROM Test.Emp WHERE DeptNo = :DeptNo;DELETE FROM Test.Dept WHERE DeptNo = :DeptNo", myConnection);
    myDataTable.DeleteCommand.Parameters.Add("DeptNo", MySqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original;
    myDataTable.Update();

    foreach(DataRow myRow in myDataTable.Rows)
    {
      foreach(DataColumn myCol in myDataTable.Columns)
      {
        Console.Write(myRow[myCol]+"\t");
      }
      Console.WriteLine();
    }
  }
  finally
  {
    myDataTable.Active = false;
  }
}

Visual Basic

Public Sub UseDataTable(ByVal myConnection As MySqlConnection)
  Dim myDataTable As MySqlDataTable = New MySqlDataTable("SELECT * FROM Test.Dept", myConnection)
  Try
    myDataTable.Active = True
    myDataTable.Rows(2).Delete()
    myDataTable.DeleteCommand = New MySqlCommand("DELETE FROM Test.Emp WHERE DeptNo = :DeptNo;DELETE FROM Test.Dept WHERE DeptNo = :DeptNo", myConnection)
    myDataTable.DeleteCommand.Parameters.Add("DeptNo", MySqlType.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original
    myDataTable.Update()

    Dim myRow As DataRow
    Dim myCol As DataColumn
    For Each myRow In myDataTable.Rows
      For Each myCol In myDataTable.Columns
        Console.Write(myRow(myCol) & Chr(9))
      Next myCol
      Console.WriteLine()
    Next myRow
  Finally
    myDataTable.Active = False
  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

MySqlDataTable Class
MySqlDataTable Members
InsertCommand Property
SelectCommand Property
UpdateCommand Property

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