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SqlDataAdapter.RowUpdating Event

Occurs during Update before a command is executed against the data source. The attempt to update is made, so the event fires.

[Visual Basic]
Public Event RowUpdating As SqlRowUpdatingEventHandler
[C#]
public event SqlRowUpdatingEventHandler RowUpdating;
[C++]
public: __event SqlRowUpdatingEventHandler* RowUpdating;

[JScript] In JScript, you can handle the events defined by a class, but you cannot define your own.

Event Data

The event handler receives an argument of type SqlRowUpdatingEventArgs containing data related to this event. The following SqlRowUpdatingEventArgs properties provide information specific to this event.

Property Description
Command Gets or sets the SqlCommand to execute when performing the Update.
Errors (inherited from RowUpdatingEventArgs) Gets any errors generated by the .NET Framework data provider when the Command executes.
Row (inherited from RowUpdatingEventArgs) Gets the DataRow to send through an Update.
StatementType (inherited from RowUpdatingEventArgs) Gets the type of SQL statement to execute.
Status (inherited from RowUpdatingEventArgs) Gets the UpdateStatus of the Command property.
TableMapping (inherited from RowUpdatingEventArgs) Gets the DataTableMapping to send through the Update.

Remarks

When using Update, there are two events that occur per data row updated. The order of execution is as follows:

  1. The values in the DataRow are moved to the parameter values.
  2. The OnRowUpdating event is raised.
  3. The command executes.
  4. If the command is set to FirstReturnedRecord, then the first returned result is placed in the DataRow.
  5. If there are output parameters, they are placed in the DataRow.
  6. The OnRowUpdated event is raised.
  7. AcceptChanges is called.

Example

[Visual Basic, C#, C++] The following example shows how to use both the RowUpdating and RowUpdated events.

[Visual Basic, C#, C++] The RowUpdating event returns this output:

[Visual Basic, C#, C++] event args: (command=System.Data.SqlClient.SqlCommand commandType=2 status=0)

[Visual Basic, C#, C++] The RowUpdated event returns this output:

[Visual Basic, C#, C++] event args: (command=System.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)

[Visual Basic] 
' handler for RowUpdating event
Protected Shared Sub OnRowUpdating(sender As Object, e As SqlRowUpdatingEventArgs)
    PrintEventArgs(e)
End Sub 'OnRowUpdating

' handler for RowUpdated event
Protected Shared Sub OnRowUpdated(sender As Object, e As SqlRowUpdatedEventArgs)
    PrintEventArgs(e)
End Sub 'OnRowUpdated

'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 = "Persist Security Info=False;Integrated Security=SSPI;database=northwind;server=mySQLServer"
    Const SELECT_ALL As String = "select * from Products"
    
    ' create DataAdapter
    Dim rAdapter As New SqlDataAdapter(SELECT_ALL, CONNECTION_STRING)
    Dim cb As SqlCommandBuilder = New SqlCommandBuilder(rAdapter)
    
    ' 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) = "new product"
    
    ' add handlers
    AddHandler rAdapter.RowUpdating, AddressOf OnRowUpdating
    AddHandler rAdapter.RowUpdated, AddressOf OnRowUpdated
    
    ' update, this operation fires two events (RowUpdating/RowUpdated) per changed row 
    rAdapter.Update(rDataSet, "Table")
    
    ' remove handlers
    RemoveHandler rAdapter.RowUpdating, AddressOf OnRowUpdating
    RemoveHandler rAdapter.RowUpdated, AddressOf OnRowUpdated
    Return 0
End Function 'Main


Overloads Protected 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 'PrintEventArgs


Overloads Protected 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 'PrintEventArgs
End Class 'Form1

[C#] 
// handler for RowUpdating event
 protected static void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e) {
    PrintEventArgs(e);
 }
 
 // handler for RowUpdated event
 protected static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e) {
    PrintEventArgs(e);
 }
 
 public static int Main(String[] args) {
    const string CONNECTION_STRING = "Persist Security Info=False;Integrated Security=SSPI;database=northwind;server=mySQLServer";
    const string SELECT_ALL = "select * from Products";
 
    // create DataAdapter
    SqlDataAdapter rAdapter = new SqlDataAdapter(SELECT_ALL, CONNECTION_STRING);
    SqlCommandBuilder cb = new SqlCommandBuilder(rAdapter);
 
    // 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] = "new product";
 
    // add handlers
    rAdapter.RowUpdating += new SqlRowUpdatingEventHandler( OnRowUpdating );
    rAdapter.RowUpdated += new SqlRowUpdatedEventHandler( OnRowUpdated );
 
    // update, this operation fires two events (RowUpdating/RowUpdated) per changed row 
    rAdapter.Update(rDataSet, "Table");
 
    // remove handlers
    rAdapter.RowUpdating -= new SqlRowUpdatingEventHandler( OnRowUpdating );
    rAdapter.RowUpdated -= new SqlRowUpdatedEventHandler( OnRowUpdated );
    return 0;
 }
 
 protected static void PrintEventArgs(SqlRowUpdatingEventArgs args) {
    Console.WriteLine("OnRowUpdating");
    Console.WriteLine("  event args: ("+
           " command=" + args.Command + 
           " commandType=" + args.StatementType + 
           " status=" + args.Status + ")");
 }
 
 protected static void PrintEventArgs(SqlRowUpdatedEventArgs args) {
    Console.WriteLine("OnRowUpdated");
    Console.WriteLine( "  event args: ("+
           " command=" + args.Command +
           " commandType=" + args.StatementType + 
           " recordsAffected=" + args.RecordsAffected + 
           " status=" + args.Status + ")" );
 }

[C++] 
protected:
// handler for RowUpdating event
 static void OnRowUpdating(Object* /*sender*/, SqlRowUpdatingEventArgs* e) {
    PrintEventArgs(e);
 }
 
 // handler for RowUpdated event
 static void OnRowUpdated(Object* /*sender*/, SqlRowUpdatedEventArgs* e) {
    PrintEventArgs(e);
 }

public:
 static int Main() {
    String* CONNECTION_STRING = S"Persist Security Info=False;Integrated Security=SSPI;database=northwind;server=mySQLServer";
    String* SELECT_ALL = S"select * from Products";
 
    // create DataAdapter
    SqlDataAdapter* rAdapter = new SqlDataAdapter(SELECT_ALL, CONNECTION_STRING);
    SqlCommandBuilder* cb = new SqlCommandBuilder(rAdapter);
 
    // Create and fill dataset (select only first 5 rows)
    DataSet* rDataSet = new DataSet();
    rAdapter->Fill(rDataSet, 0, 5, S"Table");
 
    // Modify dataSet
    DataTable* rTable = rDataSet->Tables->Item[S"Table"];
    rTable->Rows->Item[0]->Item[1] = S"new product";
 
    // add handlers
    rAdapter->RowUpdating += new SqlRowUpdatingEventHandler(0,  OnRowUpdating );
    rAdapter->RowUpdated += new SqlRowUpdatedEventHandler(0,  OnRowUpdated );
 
    // update, this operation fires two events (RowUpdating/RowUpdated) per changed row 
    rAdapter->Update(rDataSet, S"Table");
 
    // remove handlers
    rAdapter->RowUpdating -= new SqlRowUpdatingEventHandler(0,  OnRowUpdating );
    rAdapter->RowUpdated -= new SqlRowUpdatedEventHandler(0,  OnRowUpdated );
    return 0;
 }
 
protected:
 static void PrintEventArgs(SqlRowUpdatingEventArgs* args) {
    Console::WriteLine(S"OnRowUpdating");
    Console::WriteLine(String::Format( S"  event args: ( command={0} commandType={1} status={2})", args->Command, __box(args->StatementType), __box(args->Status)));
 }
 
 static void PrintEventArgs(SqlRowUpdatedEventArgs* args) {
    Console::WriteLine(S"OnRowUpdated");
    Console::WriteLine(String::Concat(
       String::Format( S"  event args: ( command={0} commandType={1} ", args->Command, __box(args->StatementType) ),
       String::Format( S"recordsAffected={0} status={1})", __box(args->RecordsAffected), __box(args->Status) )));
 }

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

SqlDataAdapter Class | SqlDataAdapter Members | System.Data.SqlClient Namespace

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