IDbDataAdapter.DeleteCommand 属性

public:
 property System::Data::IDbCommand ^ DeleteCommand { System::Data::IDbCommand ^ get(); void set(System::Data::IDbCommand ^ value); };

public System.Data.IDbCommand? DeleteCommand { get; set; }

public System.Data.IDbCommand DeleteCommand { get; set; }

member this.DeleteCommand : System.Data.IDbCommand with get, set

Public Property DeleteCommand As IDbCommand

属性值

IDbCommand 过程中使用的 Update(DataSet)，它针对数据集中已删除的行删除数据源中的记录。

示例

以下示例创建继承 OleDbDataAdapter 类的实例，并设置 SelectCommand 和 DeleteCommand 属性。 它假定你已创建对象 OleDbConnection 。

public static OleDbDataAdapter CreateCustomerAdapter(
    OleDbConnection connection)
{
    OleDbDataAdapter dataAdapter = new OleDbDataAdapter();
    OleDbCommand command;
    OleDbParameter parameter;

    // Create the SelectCommand.
    command = new OleDbCommand("SELECT CustomerID FROM Customers " +
        "WHERE Country = ? AND City = ?", connection);

    command.Parameters.Add("Country", OleDbType.VarChar, 15);
    command.Parameters.Add("City", OleDbType.VarChar, 15);

    dataAdapter.SelectCommand = command;

    // Create the DeleteCommand.
    command = new OleDbCommand(
        "DELETE * FROM Customers WHERE CustomerID = ?",
        connection);

    parameter = command.Parameters.Add(
        "CustomerID", OleDbType.Char, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    dataAdapter.DeleteCommand = command;

    return dataAdapter;
}

Public Shared Function CreateCustomerAdapter( _
    connection As OleDbConnection) As OleDbDataAdapter 

    Dim dataAdapter As New OleDbDataAdapter()
    Dim command As OleDbCommand
    Dim parameter As OleDbParameter

    ' Create the SelectCommand.
    command = New OleDbCommand("SELECT CustomerID FROM Customers " & _
        "WHERE Country = ? AND City = ?", connection)

    command.Parameters.Add("Country", OleDbType.VarChar, 15)
    command.Parameters.Add("City", OleDbType.VarChar, 15)

    dataAdapter.SelectCommand = command

    ' Create the DeleteCommand.
    command = New OleDbCommand( _
        "DELETE * FROM Customers WHERE CustomerID = ?", _
        connection)

    parameter = command.Parameters.Add( _
        "CustomerID", OleDbType.Char, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    dataAdapter.DeleteCommand = command

    Return dataAdapter
End Function

注解

在 期间Update，如果未设置此属性并且中DataSet存在主键信息，DeleteCommand则可以在 设置SelectCommand.NET Framework数据提供程序的 属性时自动生成 。 然后，未设置的任何其他命令都由 CommandBuilder 生成。 此生成逻辑要求键列信息存在于 中 DataSet。 有关详细信息，请参阅 使用 CommandBuilders 生成命令。

当 DeleteCommand 分配给之前创建的 IDbCommand时， IDbCommand 不会克隆 。 维护 DeleteCommand 对以前创建的 IDbCommand 对象的引用。

适用于