OdbcDataAdapter.DeleteCommand 屬性

定義

命名空間:

System.Data.Odbc

組件:

System.Data.Odbc.dll

套件:

System.Data.Odbc v8.0.0

來源:

OdbcDataAdapter.cs

取得或設定用來在資料來源中刪除資料錄的 SQL 陳述式或預存程序。

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

public System.Data.Odbc.OdbcCommand? DeleteCommand { get; set; }

member this.DeleteCommand : System.Data.Odbc.OdbcCommand with get, set

Public Property DeleteCommand As OdbcCommand

屬性值

OdbcCommand

OdbcCommand，用來在更新作業期間刪除資料來源中的資料錄，這些資料錄對應至 DataSet 中刪除的資料列。

範例

下列範例會 OdbcDataAdapter 建立 並設定 SelectCommand 和 DeleteCommand 屬性。 它假設您已經建立 OdbcConnection 物件。

public static OdbcDataAdapter CreateDataAdapter(
    OdbcConnection connection)
{
    string selectCommand =
        "SELECT CustomerID, CompanyName FROM Customers";

    OdbcDataAdapter adapter = new OdbcDataAdapter(
        selectCommand, connection);
    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;

    // Create the Insert, Update and Delete commands.
    adapter.InsertCommand = new OdbcCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (?, ?)");

    adapter.UpdateCommand = new OdbcCommand(
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " +
        "WHERE CustomerID = ?");

    adapter.DeleteCommand = new OdbcCommand(
        "DELETE FROM Customers WHERE CustomerID = ?");

    // Create the parameters.
    adapter.InsertCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.InsertCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");

    adapter.UpdateCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID");
    adapter.UpdateCommand.Parameters.Add("@CompanyName",
        OdbcType.VarChar, 40, "CompanyName");
    adapter.UpdateCommand.Parameters.Add("@oldCustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    adapter.DeleteCommand.Parameters.Add("@CustomerID",
        OdbcType.Char, 5, "CustomerID").SourceVersion =
        DataRowVersion.Original;

    return adapter;
}

Public Function CreateDataAdapter( _
    ByVal connection As OdbcConnection) As OdbcDataAdapter

    Dim selectCommand As String = _
        "SELECT CustomerID, CompanyName FROM Customers"
    Dim adapter As OdbcDataAdapter = _
        New OdbcDataAdapter(selectCommand, connection)

    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey

    ' Create the Insert, Update and Delete commands.
    adapter.InsertCommand = New OdbcCommand( _
        "INSERT INTO Customers (CustomerID, CompanyName) " & _
         "VALUES (?, ?)")

    adapter.UpdateCommand = New OdbcCommand( _
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " & _
        "WHERE CustomerID = ?")

    adapter.DeleteCommand = New OdbcCommand( _
        "DELETE FROM Customers WHERE CustomerID = ?")

    ' Create the parameters.
    adapter.InsertCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID")
    adapter.InsertCommand.Parameters.Add( _
        "@CompanyName", OdbcType.VarChar, 40, "CompanyName")

    adapter.UpdateCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID")
    adapter.UpdateCommand.Parameters.Add( _
        "@CompanyName", OdbcType.VarChar, 40, "CompanyName")
    adapter.UpdateCommand.Parameters.Add( _
        "@oldCustomerID", OdbcType.Char, 5, "CustomerID").SourceVersion = _
        DataRowVersion.Original

    adapter.DeleteCommand.Parameters.Add( _
        "@CustomerID", OdbcType.Char, 5, "CustomerID").SourceVersion = _
        DataRowVersion.Original

    Return adapter
End Function

備註

DeleteCommand將 屬性指派給先前建立OdbcCommand的 時，OdbcCommand不會複製 。 相反地，會 DeleteCommand 維護先前建立 OdbcCommand之的參考。

在更新作業期間，如果未 DeleteCommand 設定 ，而且主要 DataSet密鑰資訊存在於 中，您可以使用 OdbcCommandBuilder 類別來自動產生 DeleteCommand，以及協調 資料源所需的 DataSet 其他命令。 若要這樣做，請設定 SelectCommand 的 OdbcDataAdapter屬性。 產生邏輯也需要在 中 DataSet出現索引鍵數據行資訊。 如需詳細資訊，請參閱使用 CommandBuilder 產生命令。

另請參閱

• DataAdapter 和 DataReader