OracleRowUpdatingEventArgs 类

定义

命名空间:

System.Data.OracleClient

程序集:

System.Data.OracleClient.dll

为 RowUpdating 事件提供数据。

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

继承

Object

EventArgs

RowUpdatingEventArgs

OracleRowUpdatingEventArgs

示例

以下示例演示如何同时使用 RowUpdating 和 RowUpdated 事件。

事件 RowUpdating 返回以下输出：

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

事件 RowUpdated 返回以下输出：

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

注解

事件 RowUpdating 在 到 行之前 Update 引发。

使用 Update时，更新的每个数据行都会发生两个事件。 执行顺序如下：

1. 中的 DataRow 值将移动到参数值。

2. 引发 OnRowUpdating 事件。

3. 命令将执行。

4. 如果命令设置为 FirstReturnedRecord，则返回的第一个结果将放置在 中 DataRow。

5. 如果有输出参数，则它们放置在 中 DataRow。

6. 引发 OnRowUpdated 事件。

7. 调用 AcceptChanges。

构造函数

OracleRowUpdatingEventArgs(DataRow, IDbCommand, StatementType, DataTableMapping)

初始化 OracleRowUpdatingEventArgs 类的新实例。

属性

BaseCommand	获取或设置此类的实例的 IDbCommand 对象。 (继承自 RowUpdatingEventArgs)
Command	获取或设置进行 OracleCommand 时执行的 Update(DataSet)。
Errors	获取当 Command 执行时 .NET 数据提供程序生成的任何错误。 (继承自 RowUpdatingEventArgs)
Row	获取要作为插入、更新或删除操作的一部分发送到服务器的 DataRow。 (继承自 RowUpdatingEventArgs)
StatementType	获取要执行的 SQL 语句的类型。 (继承自 RowUpdatingEventArgs)
Status	获取或设置 UpdateStatus 属性的 Command。 (继承自 RowUpdatingEventArgs)
TableMapping	获取要通过 DataTableMapping 发送的 Update(DataSet)。 (继承自 RowUpdatingEventArgs)

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)