SqlCeDataAdapter-Konstruktor

Initialisiert eine neue Instanz der SqlCeDataAdapter-Klasse.

Namespace:  System.Data.SqlServerCe
Assembly:  System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)

Syntax

'Declaration
Public Sub New
'Usage

Dim instance As New SqlCeDataAdapter()

public SqlCeDataAdapter()

public:
SqlCeDataAdapter()

new : unit -> SqlCeDataAdapter

public function SqlCeDataAdapter()

Hinweise

Wenn Sie eine Instanz der SqlCeDataAdapter-Klasse erstellen, werden die folgenden Lese-/Schreibeigenschaften auf die folgenden Anfangswerte festgelegt.

Eigenschaften	Anfangswert
MissingMappingAction	MissingMappingAction.Passthrough
MissingSchemaAction	MissingSchemaAction.Add

Sie können den Wert jeder dieser Eigenschaften durch einen gesonderten Aufruf der betreffenden Eigenschaft ändern.

Beispiele

Im folgenden Beispiel wird ein SqlCeDataAdapter erstellt, und einige seiner Eigenschaften werden festgelegt.

Dim cmd As SqlCeCommand = Nothing
Dim adp As SqlCeDataAdapter = Nothing

Try
    adp = New SqlCeDataAdapter()
    Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf")

    ' Create the SelectCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "SELECT [Employee ID], [First Name], [Last Name] FROM Employees"
    adp.SelectCommand = cmd

    ' Create the InsertCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "INSERT INTO Employees ([First Name],[Last Name]) VALUES (@first, @last)"

    Dim p As SqlCeParameter = Nothing

    p = cmd.Parameters.Add("@first", SqlDbType.NVarChar, 10, "First Name")
    p.SourceVersion = DataRowVersion.Original

    p = cmd.Parameters.Add("@last", SqlDbType.NVarChar, 20, "Last Name")
    p.SourceVersion = DataRowVersion.Original

    adp.InsertCommand = cmd

    ' Create the UpdateCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "UPDATE Employees SET [First Name] = @first, " + _
        "[Last Name] = @last WHERE [Employee ID] = @employeeID"

    p = cmd.Parameters.Add("@first", SqlDbType.NVarChar, 10, "First Name")
    p.SourceVersion = DataRowVersion.Current

    p = cmd.Parameters.Add("@last", SqlDbType.NVarChar, 20, "Last Name")
    p.SourceVersion = DataRowVersion.Current

    p = cmd.Parameters.Add("@employeeID", SqlDbType.NVarChar, 20, "Employee ID")
    p.SourceVersion = DataRowVersion.Original

    adp.UpdateCommand = cmd

    ' Populate the dataset with the results from the SELECT statement
    '
    Dim ds As New DataSet()
    adp.Fill(ds)

    ' Modify the dataset
    '
    MessageBox.Show("Number of rows: " & ds.Tables(0).Rows.Count)

    ' Insert some rows
    '
    ds.Tables(0).Rows.Add(New Object() {Nothing, "Barbara", "Decker"})
    ds.Tables(0).Rows.Add(New Object() {Nothing, "Joe", "Clayton"})

    ' Update some rows
    '
    ds.Tables(0).Rows(1)(1) = "David"
    ds.Tables(0).Rows(1)(2) = "Johnson"

    ' This will execute two INSERT and one UPDATE statements
    '
    adp.Update(ds.Tables(0))
Catch e As Exception
    MessageBox.Show(e.Message)
Finally
    If Not Nothing Is adp.SelectCommand Then
        adp.SelectCommand.Dispose()
    End If
    If Not Nothing Is adp.InsertCommand Then
        adp.InsertCommand.Dispose()
    End If
End Try

SqlCeCommand cmd = null;
SqlCeDataAdapter adp = null;

try
{
    adp = new SqlCeDataAdapter();
    SqlCeConnection conn = new SqlCeConnection("Data Source = MyDatabase.sdf");

    // Create the SelectCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "SELECT [Employee ID], [First Name], [Last Name] FROM Employees";
    adp.SelectCommand = cmd;

    // Create the InsertCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "INSERT INTO Employees ([First Name],[Last Name]) VALUES (@first, @last)";

    SqlCeParameter p = null;

    p = cmd.Parameters.Add("@first", SqlDbType.NVarChar, 10, "First Name");
    p.SourceVersion = DataRowVersion.Original;

    p = cmd.Parameters.Add("@last", SqlDbType.NVarChar, 20, "Last Name");
    p.SourceVersion = DataRowVersion.Original;

    adp.InsertCommand = cmd;

    // Create the UpdateCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "UPDATE Employees SET [First Name] = @first, " +
        "[Last Name] = @last WHERE [Employee ID] = @employeeID";

    p = cmd.Parameters.Add("@first", SqlDbType.NVarChar, 10, "First Name");
    p.SourceVersion = DataRowVersion.Current;

    p = cmd.Parameters.Add("@last", SqlDbType.NVarChar, 20, "Last Name");
    p.SourceVersion = DataRowVersion.Current;

    p = cmd.Parameters.Add("@employeeID", SqlDbType.NVarChar, 20, "Employee ID");
    p.SourceVersion = DataRowVersion.Original;

    adp.UpdateCommand = cmd;

    // Populate the dataset with the results from the SELECT statement
    //
    DataSet ds = new DataSet();
    adp.Fill(ds);

    // Modify the dataset
    //
    MessageBox.Show("Number of rows: " + ds.Tables[0].Rows.Count);

    // Insert some rows
    //
    ds.Tables[0].Rows.Add(new object[] { null, "Barbara", "Decker" });
    ds.Tables[0].Rows.Add(new object[] { null, "Joe", "Clayton" });

    // Update some rows
    //
    ds.Tables[0].Rows[1][1] = "David";
    ds.Tables[0].Rows[1][2] = "Johnson";

    // This will execute two INSERT and one UPDATE statements 
    //
    adp.Update(ds.Tables[0]);


}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    if (null != adp.SelectCommand) adp.SelectCommand.Dispose();
    if (null != adp.InsertCommand) adp.InsertCommand.Dispose();
}

Siehe auch

Verweis

SqlCeDataAdapter Klasse

SqlCeDataAdapter-Überladung

System.Data.SqlServerCe-Namespace

MissingMappingAction

MissingSchemaAction