通常人们使用以下两种方法来执行SQL语句：
Set Rs=Conn.Execute(SqlStr)
和
Set Rs=Server.CreateObject(“ADODB.RecordSet“)
Rs.Open SqlStr,Conn,CursorType,LockType
（RecordSet对象方法请看这里）
由于默认的记录集游标是服务器游标，
Rs.CursorLocation = adUseServer
所以返回Rs.RecordCount=-1,
应该把服务器游标改为客户端游标，
Rs.CursorLocation = adUseClient
Rs.Open SqlStr,Conn,CursorType,LockType
rs.cursortype
光标类型 recordcount 属性
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