OleDbDataAdapter.DeleteCommand 属性

定义

获取或设置 SQL 语句或存储过程,用于从数据集中删除记录。

public:
 property System::Data::OleDb::OleDbCommand ^ DeleteCommand { System::Data::OleDb::OleDbCommand ^ get(); void set(System::Data::OleDb::OleDbCommand ^ value); };
public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }
public System.Data.OleDb.OleDbCommand? DeleteCommand { get; set; }
[System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")]
public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }
member this.DeleteCommand : System.Data.OleDb.OleDbCommand with get, set
[<System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")>]
member this.DeleteCommand : System.Data.OleDb.OleDbCommand with get, set
Public Property DeleteCommand As OleDbCommand

属性值

OleDbCommand 过程中使用的 Update(DataSet),用以删除数据源中与 DataSet 中已删除的行相对应的记录。

属性

示例

以下示例创建 并 OleDbDataAdapter 设置 SelectCommandDeleteCommand 属性。 它假定已创建 OleDbConnection 对象。

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,并且中存在 DataSet主键信息, DeleteCommand 则可以在设置 SelectCommand 属性并使用 OleDbCommandBuilder时自动生成 。 然后,未设置的任何其他命令都由 OleDbCommandBuilder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

DeleteCommand 分配给以前创建的 OleDbCommand时, OleDbCommand 不会克隆 。 维护 DeleteCommand 对以前创建的 OleDbCommand 对象的引用。

适用于

另请参阅