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Article #1371Re: Asynchronous queries
From: Viatcheslav V. Vassiliev
Date: Wed, 28 Jul 2004 05:42
Date: Wed, 28 Jul 2004 05:42
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If you do not display your query in UI - use server-side cursor, it will not fetch all rows into memory. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi for Win32 + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Star" <---> �������/�������� � �������� ���������: news:4106de81$1@newsgroups.borland.com... > Hi, > > I have very big table (about 50 million records). I usually make some > queries on this table, and it can take > several minutes to run. Is there anyway to start getting records as soon as > there is one available? > > I thought I could use something like this: > > ADODataSet1->CommandText = "SELECT Code From Subs_Subjects"; > > ADODataSet1->ExecuteOptions = ADODataSet1->ExecuteOptions << eoAsyncFetch; > ADODataSet1->Open(); > > Is that the way to do it? Should I get an event for every new record > returned? In that case, what event should I look at? > > Thanks > >
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X-Google-Thread: 10698b,e0caeb4fee49b407 X-Google-Attributes: gid10698b,public X-Google-Language: ENGLISH,ASCII From: "Viatcheslav V. Vassiliev" <support@oledbdirect.com> Newsgroups: borland.public.cppbuilder.database.ado References: <4106de81$1@newsgroups.borland.com> Subject: Re: Asynchronous queries Date: Wed, 28 Jul 2004 09:42:06 +0400 Lines: 36 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 NNTP-Posting-Host: 213.234.218.42 Message-ID: <41073cac@newsgroups.borland.com> X-Trace: newsgroups.borland.com 1090993324 213.234.218.42 (27 Jul 2004 22:42:04 -0700) Path: arc1-ca.pugleaf.net!g2news1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed.frii.net!newsfeed.frii.net!news.compaq.com!newsfeeds.ihug.co.nz!ihug.co.nz!newsgroups.borland.com!not-for-mail