|
panyName FROM Customers ORDER BY CustomerID", nwindConn)
'''' The Update command checks for optimistic concurrency violations in the WHERE clause.
custDA.UpdateCommand = New SqlCommand("UPDATE Customers (CustomerID, CompanyName) VALUES(@CustomerID, @CompanyName) " & _
"WHERE CustomerID = @oldCustomerID AND CompanyName = @oldCompanyName", nwindConn)
custDA.UpdateCommand.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID")
custDA.UpdateCommand.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 30, "CompanyName")
'''' Pass the original values to the WHERE clause parameters.
Dim myParm As SqlParameter
myParm = custDA.UpdateCommand.Parameters.Add("@oldCustomerID", SqlDbType.NChar, 5, "CustomerID")
myParm.SourceVersion = DataRowVersion.Original
myParm = custDA.UpdateCommand.Parameters.Add("@oldCompanyName", SqlDbType.NVarChar, 30, "CompanyName")
myParm.SourceVersion = DataRowVersion.Original
'''' Add the RowUpdated event handler.
AddHandler custDA.RowUpdated, New SqlRowUpdatedEventHandler(AddressOf OnRowUpdated)
Dim custDS As DataSet = New DataSet()
custDA.Fill(custDS, "Customers")
'''' Modify the DataSet contents.
custDA.Update(custDS, "Customers")
Dim myRow As DataRow
For Each myRow In custDS.Tables("Customers").Rows
If myRow.HasErrors Then Console.WriteLine(myRow(0) & vbCrLf & myRow.RowError)
Next
Private Shared Sub OnRowUpdated(sender As object, args As SqlRowUpdatedEventArgs)
If args.RecordsAffected = 0
args.Row.RowError = "Optimistic Concurrency Violation Encountered"
args.Status = UpdateStatus.SkipCurrentRow
End If
End Sub
‘C#
SqlConnection nwindConn = new SqlConnection("Data Source=localhost;Integrated Security=SSPI;Initial Catalog=northwind");
SqlDataAdapter custDA = new SqlDataAdapter("SELECT CustomerID, CompanyName FROM Customers ORDER BY CustomerID", nwindConn);
// The Update command checks for optimistic concurrency violations in the WHERE clause.
custDA.UpdateCommand = new SqlCommand("UPDATE Customers (CustomerID, CompanyName) VALUES(@CustomerID, @CompanyName) " +
"WHERE CustomerID = @oldCustomerID AND CompanyName = @oldCompanyName", nwindConn);
custDA.UpdateCommand.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
custDA.UpdateCommand.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 30, "CompanyName");
// Pass the original values to the WHERE clause parameters.
SqlParameter myParm;
myParm = custDA.UpdateCommand.Parameters.Add("@oldCustomerID", SqlDbType.NChar, 5, "CustomerID");
myParm.SourceVersion = DataRowVersion.Original;
myParm = custDA.UpdateCommand.Parameters.Add("@oldCompanyName", SqlDbType.NVarChar, 30, "CompanyName");
myParm.SourceVersion = DataRowVersion.Original;
// Add the RowUpdated event handler.
custDA.RowUpdated += new SqlRowUpdatedEventHandler(OnRowUpdated);
DataSet custDS = new DataSet();
custDA.Fill(custDS, "Customers");
// Modify the DataSet contents.
custDA.Update(custDS, "Customers");
foreach (DataRow myRow in custDS.Tables["Customers"].Rows)
{
if (myRow.HasErrors)
Console.WriteLine(myRow[0] + "\n" + myRow.RowError);
}
protected static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs args)
{ 上一页 [1] [2] [3] [4] [5] 下一页
[C语言系列]NET 中C#的switch语句的语法 [系统软件]托拽Explore中的文件到VB.net的窗口
[系统软件]Boost库在XP+Visual C++.net中的安装 [常用软件]新配色面板：Paint.Net3.0RC1官方下载
[常用软件]用内建的“Net Meeting”聊天 [VB.NET程序]Henry的VB.NET之旅（三）—共享成员
[VB.NET程序]Henry的VB.NET之旅（二）—构造与析构 [VB.NET程序]Henry的VB.NET之旅（一）—失踪的窗体
[VB.NET程序]在托盘上显示Balloon Tooltip（VB.NET） [VB.NET程序]Henry手记－VB.NET中动态加载Treeview节点（二）
| 
注：本站部分文章源于互联网，版权归原作者所有！如有侵权，请原作者与本站联系，本站将立即删除！ 本站文章除特别注明外均可转载，但需注明出处！ [MinTao学以致用网] 
