The databases all have their own version of this feature :-( so in SQL Server it's:
select top 10 from table which makes the most sense to me. But, in DB2 you use a "fetch first" clause like this: select * from table fetch first 30 rows only Here's where I found the info http://nscpcw.physics.upenn.edu/db2_docs/db2s0/fet1st.htm#HDRFET1ST I tried it out on a db2 7.2 database on win2k so hopefully it works on AS400. Dave >From: Ashish Kulkarni <[EMAIL PROTECTED]> >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >To: Struts Users Mailing List <[EMAIL PROTECTED]> >Subject: Re: [OT] RE: Struts and Large ResultSet >Date: Mon, 9 Sep 2002 16:02:00 -0700 (PDT) > >Hi, >I am developing an web interface to existing AS400 >system, so there is no way i can go to MYSQL or >suggest to change database, i have to live with AS400 >and DB2 and try to find a way out >thanx for suggestion > >--- "Peter A. J. Pilgrim" ><[EMAIL PROTECTED]> wrote: > > Ashish Kulkarni wrote: > > > Hi, > > > But is there a way to write some thing, which is > > > database independent, so u can change the database > > > without any code modification, > > > what i am trying it using CachedRowSet, i load the > > > resultset into a cachedrowset and then display it > > page > > > by page, > > > now only think i have to figure is, how can i load > > > only few records in this rowset, like if i have 1 > > > million records, just load say 1000 records, > > iterate > > > through them, if u reach end of cache load another > > > 1000, and so, > > > since a user will never go through a process of > > seeing > > > million records at a time, may be 1000 the max... > > > most user will use some thing like "Go To" to > > point at > > > a specific record in database, > > > I hope this thing works out well > > > Ashish > > > > > > Then you need something like MYSQL which has special > > reserved word to help you limit the size of the > > results. > > > > SELECT LAST_NAME, FIRST_NAME, DEPT FROM > > COMPANY_EMPLOYEES > > ORDER BY LAST_NAME > > GROUP BY DEPT > > LIMIT <offset>, <number-of-rows> > > > > The "LIMIT" word get you a finite rowset limitation > > efficiently on the Database server side. Without > > this > > you may have to read the entire data set out of the > > database. Say you only interested in rows 30 to 40 > > then you discard 30 rows already as in normal JDBC > > programming and then kill off the query and result > > after reading row 439. Suppose the database table > > has 10000 rows, then the database server may in > > efficient > > allocate the time and memory for 1000 rows to read > > by the client. But you stopped on row 40, what > > a waste with 960 unused records! > > > > So in a nutshell go with MYSQL > > > > SELECT CASH_IN, CASH_OUT, INVOICE, CUSTOMER > > FROM BOOK_BALANCE > > LIMIT 30, 10 > > > > a la google.com > > > > Or I think Oracle my have ROWINDEX attribute. > > > > ROWINDEX >= 30 and ROWINDEX < 40. > > > > Sybase and Postgres I dunno. > > > > -- > > Peter Pilgrim +-----\ +-++----++----+ > > Java Technologist | | | || || | 'n' > > Shine > > | O | | || --+| ---+ > > /\ | ._ / | | \ \ | | > > / \ | | \ \ | |+-- || ---+ A new > > day > > /_ _\ "Up" | | | | | || || | is > > coming > > || +-+ +-+ +-++----++----+ > > <home page="http://www.xenonsoft.demon.co.uk/"; /> > > > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > >===== >A$HI$H > >__________________________________________________ >Do You Yahoo!? >Yahoo! Finance - Get real-time stock quotes >http://finance.yahoo.com > >-- >To unsubscribe, e-mail: ><mailto:[EMAIL PROTECTED]> >For additional commands, e-mail: ><mailto:[EMAIL PROTECTED]> _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
