SqlCeCommand.ExecuteReader 方法 (CommandBehavior)

藉由使用其中一個 CommandBehavior 值，將 CommandText 傳送到 Connection 並建立 SqlCeDataReader。

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

語法

'宣告
Public Function ExecuteReader ( _
    behavior As CommandBehavior _
) As SqlCeDataReader
'用途
Dim instance As SqlCeCommand
Dim behavior As CommandBehavior
Dim returnValue As SqlCeDataReader

returnValue = instance.ExecuteReader(behavior)

public SqlCeDataReader ExecuteReader(
    CommandBehavior behavior
)

public:
SqlCeDataReader^ ExecuteReader(
    CommandBehavior behavior
)

member ExecuteReader : 
        behavior:CommandBehavior -> SqlCeDataReader 

public function ExecuteReader(
    behavior : CommandBehavior
) : SqlCeDataReader

參數

• behavior
  型別：System.Data.CommandBehavior
  其中一個 CommandBehavior 值。

傳回值

型別：System.Data.SqlServerCe.SqlCeDataReader
SqlCeDataReader 物件。

例外狀況

備註

SqlCeDataReader 支援可有效讀取大型二進位值的特殊模式。如需詳細資訊，請參閱 CommandBehavior 的 SequentialAccess 設定。

當 SqlCeDataReader 在使用中時，相關聯的 SqlCeConnection 會忙於服務 SqlCeDataReader。在這種狀態下，在呼叫 SqlCeDataReader 的 Close 方法之前，都只能在 SqlCeConnection 上執行 Close 作業。

範例

下列範例會建立 SqlCeCommand，然後透過傳遞 SQL SELECT 陳述式和 SqlCeConnection 物件來執行它。CommandBehavior 會設定為 CloseConnection。

Dim conn As New SqlCeConnection(connString)
Dim cmd As New SqlCeCommand("SELECT * FROM myTable", conn)

cmd.Connection.Open()
Dim rdr As SqlCeDataReader = Nothing

Try
    ' Execute the reader; make sure you alway close the 
    ' reader after you're done using it (ideally in the finally block)
    '
    rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection)

    While rdr.Read()
        Console.WriteLine(rdr.GetString(0))
    End While
Finally
    ' Closing the reader will also close the associated connection
    '
    rdr.Close()
End Try

SqlCeConnection conn = new SqlCeConnection(connString);
SqlCeCommand cmd = new SqlCeCommand("SELECT * FROM myTable", conn);

cmd.Connection.Open();
SqlCeDataReader rdr = null;

try
{
    // Execute the reader; make sure you alway close the 
    // reader after you're done using it (ideally in the finally block)
    //
    rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

    while (rdr.Read())
    {
        Console.WriteLine(rdr.GetString(0));
    }
}
finally
{
    // Closing the reader will also close the associated connection
    //
    rdr.Close();
}

請參閱

參考

SqlCeCommand 類別

ExecuteReader 多載

System.Data.SqlServerCe 命名空間