Hi Dave, this querry only works for first 30 fields, but what if i want to get data from 31 to 60, then either i have to have the key for 31 record, or else i will have to run the querry twice, first to get the first 30 and then the next 30 after setting the key.. i have nottired getting the next 30 records, but this querry work on as400 i have tried it before Ashish --- David Graham <[EMAIL PROTECTED]> wrote: > 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]> >
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