SqlDataAdapter.RowUpdated Kejadian

Definisi

Ruang nama:

Microsoft.Data.SqlClient

Rakitan:

Microsoft.Data.SqlClient.dll

Paket:

Microsoft.Data.SqlClient v7.0.1

Terjadi selama Update(DataSet) setelah perintah dijalankan terhadap sumber data. Upaya untuk memperbarui dilakukan, sehingga peristiwa diaktifkan.

public:
 event Microsoft::Data::SqlClient::SqlRowUpdatedEventHandler ^ RowUpdated;

public event Microsoft.Data.SqlClient.SqlRowUpdatedEventHandler RowUpdated;

member this.RowUpdated : Microsoft.Data.SqlClient.SqlRowUpdatedEventHandler 

Public Custom Event RowUpdated As SqlRowUpdatedEventHandler 

Jenis Acara

SqlRowUpdatedEventHandler

Contoh

Contoh berikut menunjukkan cara menggunakan RowUpdating peristiwa dan RowUpdated .

using System;
using System.Data;
using System.Data.Common;
using System.Windows.Forms;
using System.Xml;
using Microsoft.Data.SqlClient;

public class Form1 : Form
{
    private DataSet DataSet1;
    private DataGrid dataGrid1;

    // 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 = "Integrated Security=SSPI;database=Northwind;server=MSSQL1";
        const string queryString = "SELECT * FROMProducts";

        // create DataAdapter
        SqlDataAdapter adapter = new SqlDataAdapter(queryString, connectionString);
        SqlCommandBuilder builder = new SqlCommandBuilder(adapter);

        // Create and fill DataSet (select only first 5 rows)
        DataSet dataSet = new DataSet();
        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 + ")");
    }
}

Kejadian RowUpdating mengembalikan output ini:

event args: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 status=0)

Kejadian RowUpdated mengembalikan output ini:

event args: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)

Keterangan

Saat menggunakan Update(DataSet), ada dua peristiwa yang terjadi per baris data yang diperbarui. Urutan eksekusi adalah sebagai berikut:

1. Nilai dalam DataRow dipindahkan ke nilai parameter.
2. Peristiwa RowUpdating diaktifkan.
3. Perintah dijalankan.
4. Jika perintah diatur ke FirstReturnedRecord, hasil pertama yang dikembalikan ditempatkan di DataRow.
5. Jika ada parameter output, parameter tersebut ditempatkan di DataRow.
6. Peristiwa RowUpdated diaktifkan.
7. AcceptChanges() dipanggil.