OracleRowUpdatedEventArgs 类
为 RowUpdated 事件提供数据。无法继承此类。
**命名空间:**System.Data.OracleClient
**程序集:**System.Data.OracleClient(在 system.data.oracleclient.dll 中)
语法
声明
Public NotInheritable Class OracleRowUpdatedEventArgs
Inherits RowUpdatedEventArgs
用法
Dim instance As OracleRowUpdatedEventArgs
public sealed class OracleRowUpdatedEventArgs : RowUpdatedEventArgs
public ref class OracleRowUpdatedEventArgs sealed : public RowUpdatedEventArgs
public final class OracleRowUpdatedEventArgs extends RowUpdatedEventArgs
public final class OracleRowUpdatedEventArgs extends RowUpdatedEventArgs
备注
对行的 Update 完成时引发 RowUpdated 事件。
当使用 Update 时,每个更新的数据行都发生两个事件。执行顺序如下:
将 DataRow 中的值移至参数值。
引发 OnRowUpdating 事件。
执行命令。
如果该命令设置为 FirstReturnedRecord,返回的第一项结果将放置在 DataRow 中。
如果存在输出参数,它们将被放在 DataRow 中。
引发 OnRowUpdated 事件。
调用 AcceptChanges。
示例
下面的示例显示如何使用 RowUpdating 和 RowUpdated 事件。
RowUpdating 事件返回下面的输出:
Event Arguments: (command=OracleCommand commandType=2status=0)
RowUpdated 事件返回下面的输出:
Event Arguments: (command= OracleCommend commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)
'Handler for RowUpdating event.
Private Shared Sub OnRowUpdating(sender As Object, e As OracleRowUpdatingEventArgs)
PrintEventArgs(e)
End Sub 'OnRowUpdating
'Handler for RowUpdated event.
Private Shared Sub OnRowUpdated(sender As Object, e As OracleRowUpdatedEventArgs)
PrintEventArgs(e)
End Sub 'OnRowUpdated
'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)
Dim cb As OracleCommandBuilder = New OracleCommandBuilder(rAdapter)
'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 'PrintEventArgs
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 'PrintEventArgs
End Class 'Form1
// 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);
OracleCommandBuilder cb = new OracleCommandBuilder(rAdapter);
//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 + ")" );
}
继承层次结构
System.Object
System.EventArgs
System.Data.Common.RowUpdatedEventArgs
System.Data.OracleClient.OracleRowUpdatedEventArgs
线程安全
此类型的任何公共静态(Visual Basic 中的 Shared)成员都是线程安全的,但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求。
版本信息
.NET Framework
受以下版本支持:2.0、1.1