批量更新操作
.在上一個版本的ADO.NET當中，SqlDataAdapterde的Update方法將會為 DataSet當中的每一行調用一次更新操作
.在ADO.NET2.0中，您可以設置UpdateBatchSize屬性，在單步中執行多個更新
.這樣，可以提高數據更新的效率
.UpdataBatchSize的默認值為1,使得默認的更新行為與以前版本的ADO.NET一致。
代碼經驗
public Form1()
{
conn = new SqlConnection(ConfigurationManager.ConnectionStrings["AWConnectionString"].ConnectionString);
dAdapt = new SqlDataAdapter("SELECT ProductID, Name, ListPrice FROM Production.Product", conn);
InitializeComponent();
}
SqlConnection conn;
SqlDataAdapter dAdapt;
DataSet dSet = new DataSet();
StringBuilder logString = new StringBuilder("");
private void batchUpdateForm_Load(System.Object sender, System.EventArgs e)
{
dAdapt.RowUpdating += new System.Data.SqlClient.SqlRowUpdatingEventHandler(OnRowUpdating);
dAdapt.RowUpdated += new System.Data.SqlClient.SqlRowUpdatedEventHandler(OnRowUpdated);
}
private void getDataButton_Click(System.Object sender, System.EventArgs e)
{
dAdapt.Fill(dSet, "Product");
productGrid.DataSource = dSet.Tables["Product"];
}
private void updateDataButton_Click(System.Object sender, System.EventArgs e)
{
SqlCommandBuilder cb = new SqlCommandBuilder(dAdapt);
logString.Remove(0, logString.Length);
// Enable batching by setting batch size != 1.
dAdapt.UpdateBatchSize = int.Parse(batchSizeTextBox.Text);
// Execute the update.
dAdapt.Update(dSet.Tables["Product"]);
MessageBox.Show(logString.ToString());
}
//handler for the RowUpdating event
public void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e)
{
logString.AppendLine("Starting row update");
}
// handler for RowUpdated event
public void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e)
{
logString.AppendLine("Completed row update");
}
