Transaction 屬性

取得或設定在其中執行 SqlCeCommand 的交易。

命名空間：  System.Data.SqlServerCe
組件：  System.Data.SqlServerCe (在 System.Data.SqlServerCe.dll 中)

語法

'宣告
Public Property Transaction As SqlCeTransaction
    Get
    Set
'用途
Dim instance As SqlCeCommand
Dim value As SqlCeTransaction

value = instance.Transaction

instance.Transaction = value

public SqlCeTransaction Transaction { get; set; }

public:
property SqlCeTransaction^ Transaction {
    SqlCeTransaction^ get ();
    void set (SqlCeTransaction^ value);
}

member Transaction : SqlCeTransaction with get, set

function get Transaction () : SqlCeTransaction
function set Transaction (value : SqlCeTransaction)

屬性值

型別：System.Data.SqlServerCe. . :: . .SqlCeTransaction
SqlCeTransaction 。預設值為 nullNothingnullptrunitnull 參考 (在 Visual Basic 中為 Nothing)。

備註

如果 Transaction 屬性已經設定為特定值且命令正在執行中時，就無法設定該屬性。如果設定 SqlCeTransaction 物件的交易屬性，而該物件未與 SqlCeCommand 物件連接到相同的 SqlCeConnection，則在下次執行陳述式時就會擲回例外狀況。

如果 SqlCeCommand 在 SqlCeTransaction 設定為 null Nothing nullptr unit null 參考 (在 Visual Basic 中為 Nothing) 的狀況下執行，此命令就會以自動認可模式執行；因此，每個陳述式都會在自己的交易中執行。

範例

Dim conn As New SqlCeConnection("Data Source = MyDatabase.sdf; Password ='<pwd>'")
conn.Open()

' Start a local transaction
'
Dim tx As SqlCeTransaction = conn.BeginTransaction()

' By default, commands run in auto-commit mode; 
'
Dim cmd1 As SqlCeCommand = conn.CreateCommand()

' You may create multiple commands on the same connection
'
Dim cmd2 As SqlCeCommand = conn.CreateCommand()

' To enlist a command in a transaction, set the Transaction property
'
cmd1.Transaction = tx

Try
    cmd1.CommandText = "INSERT INTO Shippers ([Company Name]) VALUES ('Northwind Traders')"
    cmd1.ExecuteNonQuery()

    ' Auto-commited because cmd2 is not enlisted in a transaction
    '
    cmd2.CommandText = "INSERT INTO Employees ([Last Name], [First Name]) VALUES ('Decker', 'Barbara')"
    cmd2.ExecuteNonQuery()

    ' This will cause referential constraint violation
    '
    cmd1.CommandText = "DELETE FROM Products WHERE [Product ID] = 1"
    cmd1.ExecuteNonQuery()

    ' Commit the changes to disk if everything above succeeded
    '
    tx.Commit()
Catch
    tx.Rollback()
Finally
    conn.Close()
End Try

SqlCeConnection conn = new SqlCeConnection("Data Source = MyDatabase.sdf; Password ='<pwd>'");
conn.Open();

// Start a local transaction
//
SqlCeTransaction tx = conn.BeginTransaction();

// By default, commands run in auto-commit mode; 
//
SqlCeCommand cmd1 = conn.CreateCommand();

// You may create multiple commands on the same connection
//
SqlCeCommand cmd2 = conn.CreateCommand();

// To enlist a command in a transaction, set the Transaction property
//
cmd1.Transaction = tx;

try
{
    cmd1.CommandText = "INSERT INTO Shippers ([Company Name]) VALUES ('Northwind Traders')";
    cmd1.ExecuteNonQuery();

    // Auto-commited because cmd2 is not enlisted in a transaction
    //
    cmd2.CommandText = "INSERT INTO Employees ([Last Name], [First Name]) VALUES ('Decker', 'Barbara')";
    cmd2.ExecuteNonQuery();

    // This will cause referential constraint violation
    //
    cmd1.CommandText = "DELETE FROM Products WHERE [Product ID] = 1";
    cmd1.ExecuteNonQuery();

    // Commit the changes to disk if everything above succeeded
    //
    tx.Commit();
}
catch (Exception)
{
    tx.Rollback();
}
finally
{
    conn.Close();
}

請參閱

參考

SqlCeCommand類別

SqlCeCommand 成員

System.Data.SqlServerCe 命名空間