SqlCeDataAdapter.DeleteCommand Property

取得或設定 SQL 陳述式從資料集刪除資料錄。

命名空間: System.Data.SqlServerCe
組件: System.Data.SqlServerCe (在 system.data.sqlserverce.dll)

語法

'宣告
Public Property DeleteCommand As SqlCeCommand

public SqlCeCommand DeleteCommand { get; set; }

public:
property SqlCeCommand^ DeleteCommand {
    SqlCeCommand^ get ();
    void set (SqlCeCommand^ value);
}

/** @property */
public SqlCeCommand get_DeleteCommand ()

/** @property */
public void set_DeleteCommand (SqlCeCommand value)

public function get DeleteCommand () : SqlCeCommand

public function set DeleteCommand (value : SqlCeCommand)

屬性值

用於 Update 期間的 SqlCeCommand，可刪除資料來源中與 DataSet 中的已刪除資料列相對應的資料錄。

備註

在呼叫 Update 期間如果此屬性尚未設定，且 DataSet 中存在主索引鍵資訊，則如果設定 SelectCommand 屬性並使用 SqlCeCommandBuilder，則可以自動產生 DeleteCommand。然後，任何未設定的其他命令會由 SqlCeCommandBuilder 產生。這個產生邏輯需要 DataSet 中存在索引鍵資料行資訊。

當 DeleteCommand 指派給先前建立的 SqlCeCommand 時，並不會複製 SqlCeCommand。DeleteCommand 會維護先前所建立之 SqlCeCommand 物件的參考。

範例

下列範例會建立 SqlCeDataAdapter，並設定其部份屬性。

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 * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city"
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15)
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15)

    cmd.Parameters("@country").Value = "UK"
    cmd.Parameters("@city").Value = "London"

    adp.SelectCommand = cmd

    ' Create the DeleteCommand
    '
    cmd = conn.CreateCommand()
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID"

    Dim p As SqlCeParameter = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID")
    p.SourceVersion = DataRowVersion.Original

    adp.DeleteCommand = 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)

    ' Delete some rows
    '
    ds.Tables(0).Rows(3).Delete()
    ds.Tables(0).Rows(4).Delete()

    ' This will execute two DELETE 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.DeleteCommand Then
        adp.DeleteCommand.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 * FROM Orders WHERE [Ship Country] = @country AND [Ship City] = @city";
    cmd.Parameters.Add("@country", SqlDbType.NVarChar, 15);
    cmd.Parameters.Add("@city", SqlDbType.NVarChar, 15);

    cmd.Parameters["@country"].Value = "UK";
    cmd.Parameters["@city"].Value = "London";

    adp.SelectCommand = cmd;

    // Create the DeleteCommand
    //
    cmd = conn.CreateCommand();
    cmd.CommandText = "DELETE FROM Orders WHERE [Order ID] = @orderID";

    SqlCeParameter p = cmd.Parameters.Add("@orderID", SqlDbType.NChar, 5, "Order ID");
    p.SourceVersion = DataRowVersion.Original;

    adp.DeleteCommand = 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);

    // Delete some rows
    //
    ds.Tables[0].Rows[3].Delete();
    ds.Tables[0].Rows[4].Delete();

    // This will execute two DELETE statements 
    //
    adp.Update(ds.Tables[0]);
}
catch (Exception e)
{
    MessageBox.Show(e.Message);
}
finally
{
    if (null != adp.SelectCommand) adp.SelectCommand.Dispose();
    if (null != adp.DeleteCommand) adp.DeleteCommand.Dispose();
}

執行緒安全性

任何公用靜態 (共用 在 Microsoft Visual Basic) 此型別的成員具備執行緒安全。不保證任何執行個體成員安全執行緒。

平台

開發平台

Windows Vista, Windows Mobile 5.0, Windows XP Professional with Service Pack 2 (SP2), Windows Server 2003, Windows Mobile 2003 for Pocket PC, Windows CE 5.0
版本資訊
.NET Framework 及 NET Compact Framework
支援於 3.5
.NET Framework
支援於 3.0
.NET Compact Framework 及 .Net Framework
支援於 2.0

另請參閱

參考

SqlCeDataAdapter Class
SqlCeDataAdapter Members
System.Data.SqlServerCe Namespace
InsertCommand
SelectCommand
UpdateCommand