给出以下代码：
Set conn = CreateObject("ADODB.Connection")
Set RS = CreateObject("ADODB.Recordset")
conn.BeginTrans
...
//This is the line it is about
RS.Open "SELECT a,b FROM c FOR UPDATE", conn, adOpenDynamic, adLockPessimistic
...
RS.Close
conn.CommitTrans
conn.Close
我使用时有什么区别：
RS.Open "SELECT a,b FROM c (UPDLOCK)", conn, adOpenDynamic, adLockPessimistic
更新：
现在我们使用 FOR UPDATE 但看起来表没有锁定。SQL Profiler 向我们展示了这一点：
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
declare @p1 int set @p1=NULL declare @p3 int set @p3=229378 declare @p4 int set @p4=163842 declare @p5 int set @p5=NULL exec sp_cursoropen @p1 output,N'SELECT a,b FROM …