OracleDataAdapter.DeleteCommand Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets or sets an SQL statement or stored procedure used to delete records in the database.
public:
property System::Data::OracleClient::OracleCommand ^ DeleteCommand { System::Data::OracleClient::OracleCommand ^ get(); void set(System::Data::OracleClient::OracleCommand ^ value); };public System.Data.OracleClient.OracleCommand DeleteCommand { get; set; }member this.DeleteCommand : System.Data.OracleClient.OracleCommand with get, setPublic Property DeleteCommand As OracleCommandProperty Value
An OracleCommand used during an update operation to delete records in the database that correspond to deleted rows in the DataSet.
Examples
The following example creates an OracleDataAdapter and sets the SelectCommand and DeleteCommand properties. It assumes you have already created an OracleConnection object.
Public Shared Function CreateCustomerAdapter(conn As OracleConnection) As OracleDataAdapter
Dim da As OracleDataAdapter = New OracleDataAdapter()
Dim cmd As OracleCommand
Dim parm As OracleParameter
' Create the SelectCommand.
cmd = New OracleCommand("SELECT * FROM Dept " & _
"WHERE DName = :pDName AND Loc = :pLoc", conn)
cmd.Parameters.Add("pDName", OracleType.NVarChar, 14)
cmd.Parameters.Add("pLoc", OracleType.NVarChar, 13)
da.SelectCommand = cmd
' Create the DeleteCommand.
cmd = New OracleCommand("DELETE FROM Dept WHERE DeptNo = :pDeptNo", conn)
parm = cmd.Parameters.Add("pDeptNo", OracleType.Number, 2, "DeptNo")
parm.SourceVersion = DataRowVersion.Original
da.DeleteCommand = cmd
Return da
End Function
public static OracleDataAdapter CreateCustomerAdapter(OracleConnection conn)
{
OracleDataAdapter da = new OracleDataAdapter();
OracleCommand cmd;
OracleParameter parm;
// Create the SelectCommand.
cmd = new OracleCommand("SELECT * FROM Dept " +
"WHERE DName = :pDName AND Loc = :pLoc", conn);
cmd.Parameters.Add("pDName", OracleType.NVarChar, 14);
cmd.Parameters.Add("pLoc", OracleType.NVarChar, 13);
da.SelectCommand = cmd;
// Create the DeleteCommand.
cmd = new OracleCommand("DELETE FROM Dept WHERE DeptNo = :pDeptNo", conn);
parm = cmd.Parameters.Add("pDeptNo", OracleType.Number, 2, "DeptNo");
parm.SourceVersion = DataRowVersion.Original;
da.DeleteCommand = cmd;
return da;
}
Remarks
When the DeleteCommand property is assigned to a previously created OracleCommand, the OracleCommand is not cloned. Instead, the DeleteCommand maintains a reference to the previously created OracleCommand.
During an update operation, if DeleteCommand is not set and primary key information is present in the DataSet, you can use the OracleCommandBuilder class to automatically generate the DeleteCommand, and additional commands needed to reconcile the DataSet to the database. To do this, set the SelectCommand property of the OracleDataAdapter. The generation logic also requires key column information to be present in the DataSet. For more information see Generating Commands with CommandBuilders.
