DeleteCommand Property (DB2DataAdapter)

In This Topic

Gets or sets a DB2 statement to delete records from the data set.

Syntax

Visual Basic
C#

'Declaration
 
Public Shadows Property DeleteCommand As DB2Command

public new DB2Command DeleteCommand {get; set;}

Property Value

A DB2Command used during an update operation to delete records in DB2 that correspond to deleted rows in the System.Data.DataSet.

Remarks

During an update operation, if DeleteCommand is not set and primary key information is present in the System.Data.DataSet, you can use the DB2CommandBuilder class to automatically generate the DeleteCommand, and additional commands needed to reconcile the System.Data.DataSet to the data source. To do this, set the SelectCommand property of the DB2DataAdapter. For more information see "Automatically Generated Commands" in the Microsoft .NET Framework SDK documentation.

Example

The following example demonstrates how to retrieve and manipulate data using DB2DataAdapter.

csharp

public void UseDataAdapter(DB2Connection db2Connection)
{
  DB2DataAdapter myAdapter = new DB2DataAdapter("SELECT DeptNo, DName FROM Dept", db2Connection);
  myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
  DataSet myDataSet = new DataSet();
  myAdapter.Fill(myDataSet,"Departments");
  myDataSet.Tables["Departments"].Rows[3].Delete();
  myAdapter.DeleteCommand = new DB2Command("DELETE FROM Dept WHERE DeptNo = :DeptNo", db2Connection);
  myAdapter.DeleteCommand.Parameters.Add("DeptNo", DB2Type.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original;
  myAdapter.Update(myDataSet,"Departments"); 
  
  //Get all data from all tables within the dataset
  foreach(DataTable myTable in myDataSet.Tables)
  {
    foreach(DataRow myRow in myTable.Rows)
    {
      foreach (DataColumn myColumn in myTable.Columns)
      {
        Console.Write(myRow[myColumn]+"\t");
      }
      Console.WriteLine();
    }
    Console.WriteLine();
  }
}

Visual Basic

Public Sub UseDataAdapter(ByVal db2Connection As DB2Connection)
  Dim myAdapter As DB2DataAdapter = New DB2DataAdapter("SELECT DeptNo, DName FROM Dept", db2Connection)
  myAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey
  Dim myDataSet As DataSet = New DataSet
  myAdapter.Fill(myDataSet, "Departments")
  myDataSet.Tables("Departments").Rows(3).Delete()
  myAdapter.DeleteCommand = New DB2Command("DELETE FROM Dept WHERE DeptNo = :DeptNo", db2Connection)
  myAdapter.DeleteCommand.Parameters.Add("DeptNo", DB2Type.Int, 0, "DeptNo").SourceVersion = DataRowVersion.Original
  myAdapter.Update(myDataSet, "Departments")
  Dim myTable As DataTable
  Dim myRow As DataRow
  Dim myColumn As DataColumn
  ' Get all data from all tables within the dataset
  For Each myTable In myDataSet.Tables
    For Each myRow In myTable.Rows
      For Each myColumn In myTable.Columns
        Console.Write(myRow(myColumn) & Chr(9))
      Next myColumn
      Console.WriteLine()
    Next myRow
    Console.WriteLine()
  Next myTable
End Sub

Reference

DB2DataAdapter Class
DB2DataAdapter Members
InsertCommand Property
SelectCommand Property
UpdateCommand Property

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