OracleRowUpdatingEventArgs Class

Definition

Предоставляет данные о событии RowUpdating.Provides data for the RowUpdating event.

public ref class OracleRowUpdatingEventArgs sealed : System::Data::Common::RowUpdatingEventArgs
public sealed class OracleRowUpdatingEventArgs : System.Data.Common.RowUpdatingEventArgs
type OracleRowUpdatingEventArgs = class
    inherit RowUpdatingEventArgs
Public NotInheritable Class OracleRowUpdatingEventArgs
Inherits RowUpdatingEventArgs
Inheritance
OracleRowUpdatingEventArgs

Examples

В следующем примере показано, как использовать события RowUpdating и RowUpdated.The following example shows how to use both the RowUpdating and RowUpdated events.

Событие RowUpdating возвращает следующие выходные данные:The RowUpdating event returns this output:

Event Arguments: (command=OracleCommand commandType=2 status=0)

Событие RowUpdated возвращает следующие выходные данные:The RowUpdated event returns this output:

Event Arguments: (command=OracleCommand commandType=2 recordsAffected=1 row=DataRow[37] status=0)

// handler for RowUpdating event
private static void OnRowUpdating(object sender, OracleRowUpdatingEventArgs e)
{
    PrintEventArgs(e);
}

//Handler for RowUpdated event.
private static void OnRowUpdated(object sender, OracleRowUpdatedEventArgs e)
{
    PrintEventArgs(e);
}

public static int Main(String[] args)
{
    const string CONNECTION_STRING = "Data Source=Oracle8i;Integrated Security=yes";
    const string SELECT_ALL = "SELECT * FROM Scott.Emp";

    //Create DataAdapter.
    OracleDataAdapter rAdapter    = new OracleDataAdapter(SELECT_ALL, CONNECTION_STRING);

    //Create and fill DataSet (Select only first 5 rows.).
    DataSet rDataSet = new DataSet();
    rAdapter.Fill(rDataSet, 0, 5, "Table");

    //Modify DataSet.
    DataTable rTable = rDataSet.Tables["Table"];
    rTable.Rows[0][1] = "DYZY";

    //Add handlers.
    rAdapter.RowUpdating += new OracleRowUpdatingEventHandler( OnRowUpdating );
    rAdapter.RowUpdated += new OracleRowUpdatedEventHandler( OnRowUpdated );

    //Update--this operation fires two events (RowUpdating and RowUpdated) for each changed row.
    rAdapter.Update(rDataSet, "Table");

    //Remove handlers.
    rAdapter.RowUpdating -= new OracleRowUpdatingEventHandler( OnRowUpdating );
    rAdapter.RowUpdated -= new OracleRowUpdatedEventHandler( OnRowUpdated );
    return 0;
}

private static void PrintEventArgs(OracleRowUpdatingEventArgs args)
{
    Console.WriteLine("OnRowUpdating");
    Console.WriteLine("  event args: ("+
        " command=" + args.Command +
        " commandType=" + args.StatementType +
        " status=" + args.Status + ")");
}

private static void PrintEventArgs(OracleRowUpdatedEventArgs args)
{
    Console.WriteLine("OnRowUpdated");
    Console.WriteLine("  event args: ("+
        " command=" + args.Command +
        " commandType=" + args.StatementType +
        " recordsAffected=" + args.RecordsAffected +
        " status=" + args.Status + ")");
}
'Handler for RowUpdating event.
Private Shared Sub OnRowUpdating(sender As Object, e As OracleRowUpdatingEventArgs)
    PrintEventArgs(e)
End Sub

'Handler for RowUpdated event.
Private Shared Sub OnRowUpdated(sender As Object, e As OracleRowUpdatedEventArgs)
    PrintEventArgs(e)
End Sub

'Entry point which delegates to C-style main Private Function.
Public Overloads Shared Sub Main()
    System.Environment.ExitCode = Main(System.Environment.GetCommandLineArgs())
End Sub

Overloads Public Shared Function Main(args() As String) As Integer
    Const CONNECTION_STRING As String = "Data Source=Oracle8i;Integrated Security=yes"
    Const SELECT_ALL As String = "SELECT * FROM Scott.Emp"
    
    'Create DataAdapter.
    Dim rAdapter As New OracleDataAdapter(SELECT_ALL, CONNECTION_STRING)
    
    'Create and fill DataSet (Select only first 5 rows.).
    Dim rDataSet As New DataSet()
    rAdapter.Fill(rDataSet, 0, 5, "Table")
    
    'Modify DataSet.
    Dim rTable As DataTable = rDataSet.Tables("Table")
    rTable.Rows(0)(1) = "DYZY"
    
    'Add handlers.
    AddHandler rAdapter.RowUpdating, AddressOf OnRowUpdating
    AddHandler rAdapter.RowUpdated, AddressOf OnRowUpdated
    
    'Update--this operation fires two events (RowUpdating and RowUpdated) for each changed row. 
    rAdapter.Update(rDataSet, "Table")
    
    'Remove handlers.
    RemoveHandler rAdapter.RowUpdating, AddressOf OnRowUpdating
    RemoveHandler rAdapter.RowUpdated, AddressOf OnRowUpdated
    Return 0
End Function 'Main

Overloads Private Shared Sub PrintEventArgs(args As OracleRowUpdatingEventArgs)
    Console.WriteLine("OnRowUpdating")
    Console.WriteLine("  event args: (" & _
                    " command=" & _
                    args.Command.CommandText & _
                    " commandType=" & _
                    args.StatementType & _
                    " status=" & _
                    args.Status & _
                    ")")
End Sub


Overloads Private Shared Sub PrintEventArgs(args As OracleRowUpdatedEventArgs)
    Console.WriteLine("OnRowUpdated")
    Console.WriteLine("  event args: (" & _
                    " command=" & _
                    args.Command.CommandText & _
                    " commandType=" & _
                    args.StatementType & _
                    " recordsAffected=" & _
                    args.RecordsAffected & _
                    " status=" & _
                    args.Status & _
                    ")")
End Sub

Remarks

Событие RowUpdating возникает перед Update строки.The RowUpdating event is raised before an Update to a row.

При использовании Updateдля каждой обновленной строки данных происходит два события.When using Update, there are two events that occur for each data row updated. Порядок выполнения выглядит следующим образом:The order of execution is as follows:

  1. Значения в DataRow перемещаются в значения параметров.The values in the DataRow are moved to the parameter values.

  2. Возникает событие OnRowUpdating.The OnRowUpdating event is raised.

  3. Команда выполняется.The command executes.

  4. Если команда имеет значение FirstReturnedRecord, первый возвращенный результат помещается в DataRow.If the command is set to FirstReturnedRecord, the first returned result is placed in the DataRow.

  5. Если имеются выходные параметры, они помещаются в DataRow.If there are output parameters, they are placed in the DataRow.

  6. Возникает событие OnRowUpdated.The OnRowUpdated event is raised.

  7. Вызывается метод AcceptChanges.AcceptChanges is called.

Constructors

OracleRowUpdatingEventArgs(DataRow, IDbCommand, StatementType, DataTableMapping)

Инициализирует новый экземпляр класса OracleRowUpdatingEventArgs.Initializes a new instance of the OracleRowUpdatingEventArgs class.

Properties

BaseCommand

Возвращает или задает объект IDbCommand для экземпляра этого класса.Gets or sets the IDbCommand object for an instance of this class.

(Inherited from RowUpdatingEventArgs)
Command

Возвращает или задает команду OracleCommand, которую необходимо выполнить в процессе Update(DataSet).Gets or sets the OracleCommand to execute when performing the Update(DataSet).

Errors

Возвращает ошибки, создаваемые поставщиком данных .NET Framework при выполнении Command.Gets any errors generated by the .NET Framework data provider when the Command executes.

(Inherited from RowUpdatingEventArgs)
Row

Возвращает объект DataRow, который будет отправлен на сервер в качестве части операции вставки, обновления или удаления.Gets the DataRow that will be sent to the server as part of an insert, update, or delete operation.

(Inherited from RowUpdatingEventArgs)
StatementType

Получает тип инструкции SQL для выполнения.Gets the type of SQL statement to execute.

(Inherited from RowUpdatingEventArgs)
Status

Возвращает или задает значение UpdateStatus свойства Command.Gets or sets the UpdateStatus of the Command property.

(Inherited from RowUpdatingEventArgs)
TableMapping

Возвращает объект DataTableMapping для отправки с помощью метода Update(DataSet).Gets the DataTableMapping to send through the Update(DataSet).

(Inherited from RowUpdatingEventArgs)

Methods

Equals(Object)

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode()

Служит хэш-функцией по умолчанию.Serves as the default hash function.

(Inherited from Object)
GetType()

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone()

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)

Applies to