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Rownum [message #2224]

Sun, 30 June 2002 02:53

Maya
Messages: 7
Registered: May 2002

Junior Member

Hi,

I have a query that retrieves each time 100 rows from a table into buffer.
1) How can I guaranty that each time I will get the next 100 rows from the table ?
2) Also I would like that the buffers will have sequential order, meaning the first record on the next buffer will be sorted after the last record of the previous buffer ?

I also need to consider performance issue.

any help will be appreciate.

Thanks,
Maya

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Re: Rownum [message #2243 is a reply to message #2224]

Mon, 01 July 2002 12:46

Dhiren
Messages: 43
Registered: July 2002

Member

What exactly do you mean by buffer/What are u using
sqlplus/forms or something else.
The behaviour of the buffer depends on these kind
of inputs.
eg. Forms has a property for a block - # of records
buffered which controls the behaviour of the
buffered rows.
Normally the orderby clause controls the sequencing
of the records displayed.

Dhiren

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Re: Rownum [message #2247 is a reply to message #2243]

Tue, 02 July 2002 00:23

Maya
Messages: 7
Registered: May 2002

Junior Member

what I mean is that I have sql query in a function in pro-c program which brings 100 rows from the DB. I call this function several times from Cobol program, until the number of rows that I got is less then 100 - meaning it is the end of the table. I also commit changes to the DB after finishing to process the 100 rows I had.
The problem is that I need the first row in the second "buffer" to be sorted after the last row in the previous "buffer" of rows and so on.
I have order by but this will effect the selected rows after they were selected. I need something that will guaranty that every time we get 100 rows they are ordered after the previous 100 rows.

I have heard about connect_at command which allowing me to hold the cursor open even when committing the changes to the DB. It this the best solution ? is there something better ?

Thanks.

.

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Re: Rownum [message #2255 is a reply to message #2247]

Tue, 02 July 2002 06:12

Dhiren
Messages: 43
Registered: July 2002

Member

Guess you will have to use
Start with and prior in your SELECT statement.
Check out how to use it on this link
http://oradoc.photo.net/ora81/DOC/server.815/a67779/ch4l.htm#10900

Hope this helps
Dhiren

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