The reason and solution of recordcount=-1

　In the past two days, friends have often asked me, why my database has records, but RecordCount = -1, what is the cause? How to solve the problem of RecordCount = -1, please see the system holy land to explain it to you in detail.

 

　　Generally people use the following two methods to execute SQL statements:

 

　　Set Rs=Conn.Execute(SqlStr)

 

　　and

 

　　Set Rs=Server.CreateObject(“ADODB.RecordSet“)

 

　　Rs.Open SqlStr,Conn,CursorType,LockType

 

　　(See here for RecordSet object methods)

 

　　Since the default recordset cursor is a server cursor,

 

　　Rs.CursorLocation = adUseServer

 

　　So return Rs.RecordCount=-1,

 

　　The server cursor should be changed to a client cursor,

 

　　Rs.CursorLocation = adUseClient

 

　　Rs.Open SqlStr,Conn,CursorType,LockType

 

　　rs.cursortype

 

　　Cursor type recordcount property

 

　　ForwardOnly 0 (default) returns -1

 

　　Keyset 1 correct number of records

 

　　Dynamic 2 -1 or incorrect number of records, depending on data source

 

　　Static 3 correct number of records

 

　　So Rs.CursorLocation = 3

 

　　Use recordset.support("property name") to test whether the property is supported.