SqlRowUpdatedEventArgs 类
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
提供事件的数据 RowUpdated 。
public ref class SqlRowUpdatedEventArgs sealed : System::Data::Common::RowUpdatedEventArgs
public sealed class SqlRowUpdatedEventArgs : System.Data.Common.RowUpdatedEventArgs
type SqlRowUpdatedEventArgs = class
inherit RowUpdatedEventArgs
Public NotInheritable Class SqlRowUpdatedEventArgs
Inherits RowUpdatedEventArgs
- 继承
示例
以下示例演示如何同时使用 RowUpdating 和 RowUpdated 事件。
该 RowUpdating 事件返回以下输出:
事件参数:(command=System.Data.SqlClient.SqlCommand commandType=2 status=0)
该 RowUpdated 事件返回以下输出:
事件参数:(command=System.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)
// handler for RowUpdating event
private static void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e)
{
PrintEventArgs(e);
}
// handler for RowUpdated event
private static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e)
{
PrintEventArgs(e);
}
public static int Main()
{
const string connectionString = "...";
const string queryString = "SELECT * FROM Products";
// create DataAdapter
SqlDataAdapter adapter = new(queryString, connectionString);
SqlCommandBuilder builder = new(adapter);
// Create and fill DataSet (select only first 5 rows)
DataSet dataSet = new();
adapter.Fill(dataSet, 0, 5, "Table");
// Modify DataSet
DataTable table = dataSet.Tables["Table"];
table.Rows[0][1] = "new product";
// add handlers
adapter.RowUpdating += new SqlRowUpdatingEventHandler(OnRowUpdating);
adapter.RowUpdated += new SqlRowUpdatedEventHandler(OnRowUpdated);
// update, this operation fires two events
// (RowUpdating/RowUpdated) per changed row
adapter.Update(dataSet, "Table");
// remove handlers
adapter.RowUpdating -= new SqlRowUpdatingEventHandler(OnRowUpdating);
adapter.RowUpdated -= new SqlRowUpdatedEventHandler(OnRowUpdated);
return 0;
}
private static void PrintEventArgs(SqlRowUpdatingEventArgs args)
{
Console.WriteLine("OnRowUpdating");
Console.WriteLine(" event args: (" +
" command=" + args.Command +
" commandType=" + args.StatementType +
" status=" + args.Status + ")");
}
private static void PrintEventArgs(SqlRowUpdatedEventArgs 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 SqlRowUpdatingEventArgs)
PrintEventArgs(e)
End Sub
' handler for RowUpdated event
Private Shared Sub OnRowUpdated(sender As Object, e As SqlRowUpdatedEventArgs)
PrintEventArgs(e)
End Sub
Public Overloads Shared Function Main(args() As String) As Integer
Const connectionString As String = "..."
Const queryString As String = "SELECT * FROM Products"
' create DataAdapter
Dim adapter As New SqlDataAdapter(queryString, connectionString)
Dim builder As New SqlCommandBuilder(adapter)
' Create and fill DataSet (select only first 5 rows)
Dim dataSet As New DataSet()
adapter.Fill(dataSet, 0, 5, "Table")
' Modify DataSet
Dim table As DataTable = dataSet.Tables("Table")
table.Rows(0)(1) = "new product"
' add handlers
AddHandler adapter.RowUpdating, AddressOf OnRowUpdating
AddHandler adapter.RowUpdated, AddressOf OnRowUpdated
' update, this operation fires two events
'(RowUpdating/RowUpdated) per changed row
adapter.Update(dataSet, "Table")
' remove handlers
RemoveHandler adapter.RowUpdating, AddressOf OnRowUpdating
RemoveHandler adapter.RowUpdated, AddressOf OnRowUpdated
Return 0
End Function
Private Overloads Shared Sub PrintEventArgs(args As SqlRowUpdatingEventArgs)
Console.WriteLine("OnRowUpdating")
Console.WriteLine(" event args: (" & " command=" & args.Command.CommandText &
" commandType=" & args.StatementType & " status=" & args.Status & ")")
End Sub
Private Overloads Shared Sub PrintEventArgs(args As SqlRowUpdatedEventArgs)
Console.WriteLine("OnRowUpdated")
Console.WriteLine(" event args: (" & " command=" & args.Command.CommandText &
" commandType=" & args.StatementType & " recordsAffected=" &
args.RecordsAffected & " status=" & args.Status & ")")
End Sub
End Class
注解
完成 RowUpdated 行时 Update 将引发该事件。
使用 Update时,每个更新的数据行都会发生两个事件。 执行顺序如下所示:
DataRow 中的值将移动到参数值。
引发 OnRowUpdating 事件。
该命令执行。
如果命令设置为
FirstReturnedRecord,并且第一个返回的结果将放在该命令中 DataRow。如果有输出参数,则它们放置在 DataRow中。
引发 OnRowUpdated 事件。
调用 AcceptChanges。
构造函数
| 名称 | 说明 |
|---|---|
| SqlRowUpdatedEventArgs(DataRow, IDbCommand, StatementType, DataTableMapping) |
初始化 SqlRowUpdatedEventArgs 类的新实例。 |
属性
| 名称 | 说明 |
|---|---|
| Command |
获取或设置 SqlCommand 调用时 Update(DataSet) 执行的。 |
| Errors |
获取执行 Command 时.NET数据提供程序生成的任何错误。 (继承自 RowUpdatedEventArgs) |
| RecordsAffected |
获取通过执行 SQL 语句更改、插入或删除的行数。 (继承自 RowUpdatedEventArgs) |
| Row |
DataRow获取通过一个 Update(DataSet). (继承自 RowUpdatedEventArgs) |
| RowCount |
获取在一批更新的记录中处理的行数。 (继承自 RowUpdatedEventArgs) |
| StatementType |
获取执行的 SQL 语句的类型。 (继承自 RowUpdatedEventArgs) |
| Status |
UpdateStatus Command获取属性。 (继承自 RowUpdatedEventArgs) |
| TableMapping |
DataTableMapping获取通过一个 Update(DataSet). (继承自 RowUpdatedEventArgs) |
方法
| 名称 | 说明 |
|---|---|
| CopyToRows(DataRow[], Int32) |
将对修改后的行的引用复制到提供的数组中。 (继承自 RowUpdatedEventArgs) |
| CopyToRows(DataRow[]) |
将对修改后的行的引用复制到提供的数组中。 (继承自 RowUpdatedEventArgs) |
| Equals(Object) |
确定指定的对象是否等于当前对象。 (继承自 Object) |
| GetHashCode() |
用作默认哈希函数。 (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() |
返回一个表示当前对象的字符串。 (继承自 Object) |