agora inbox for postgres@postgres.berkeley.edu
help / color / mirror / Atom feedSearching on seperate words in an attribute
4+ messages / 3 participants
[nested] [flat]
* Searching on seperate words in an attribute
@ 1994-08-16 12:41 Eric P Dean <ericdean@iastate.edu>
1994-08-17 00:19 ` bytea data types Robert.Patrick@cs.cmu.edu
1994-08-19 23:24 ` Re: Searching on seperate words in an attribute Paul M. Aoki <aoki@cs.berkeley.edu>
0 siblings, 2 replies; 4+ messages in thread
From: Eric P Dean @ 1994-08-16 12:41 UTC (permalink / raw)
To: legacy
I've been working with POSTGRES for a few weeks after a sucessfull
installation on a DEC 5000/133 running Ultrix 4.3. My work-group
administrator did most of the installation work as I watched over his
shoulder. I wonder if someone could tell me if it possible to create an
index that will locate instances by searching for words seperately in a
attribute. For example: If I have an attribute "artist = Gogh, Vincent
van" I would like to be able to locate the instance by doing a "retrieve
(xxx.all) where xxx.artist = "gogh"" or "retrieve (xxx.all) where
xxx.artist = "VAN"". I would like searches to be case-insensitive and
have some type of truncation feature. If this is possible, can you
please tell me where I can find the information in the documentation.
Many thanks
Eric Dean
Curator, Visual Resources Collection
College of Design, Iowa State University
==============================================================================
To add/remove yourself to/from the POSTGRES mailing list: send mail with
the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU"
If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and
a human will deal with it. DO NOT post to the "postgres" mailing list.
==============================================================================
^ permalink raw reply [nested|flat] 4+ messages in thread
* bytea data types
1994-08-16 12:41 Searching on seperate words in an attribute Eric P Dean <ericdean@iastate.edu>
@ 1994-08-17 00:19 ` Robert.Patrick@cs.cmu.edu
1994-08-19 19:47 ` Re: bytea data types Paul M. Aoki <aoki@cs.berkeley.edu>
1 sibling, 1 reply; 4+ messages in thread
From: Robert.Patrick@cs.cmu.edu @ 1994-08-17 00:19 UTC (permalink / raw)
To: legacy
Postgres has a built-in byte array type (bytea). My question is how do
I use this type? For example, let's say I have a small GIF file (or any
other binary data) that I want to store as a byte array.
create images (id =int4, contents=bytea)
append images (id=1234, contents=?????????)
What I really want to know is:
1.) What goes where the "??????????" are?
2.) If this can be done, is the big-endian, little-endian problem
handled by Postgres or do I have to do it myself?
Thanks,
Robert
--
+------------------------------------------------------------------------+
| Robert Patrick _/_/_/_/ _/ _/ _/_/_/_/ |
| n-dim Group _/ _/ _/ _/ _/ _/ |
| Engineering Design Research Center _/ _/ _/ _/ _/ _/ |
| Department of Chemical Engineering _/ _/ _/ _/ _/ _/ |
| Carnegie Mellon University _/_/_/_/ _/_/_/_/_/ _/_/_/_/ |
| Pittsburgh, PA 15213 _/ _/ _/ _/ _/ |
| Phone: (412)268-5215 _/ _/ _/ _/ _/ |
| Fax: (412)268-5229 _/ _/ _/ _/ _/ |
| rp2y+@eiger.edrc.cmu.edu _/ _/ _/ _/ _/ |
| rp2y+@andrew.cmu.edu |
| World Wide Web: http://paneer.ndim.edrc.cmu.edu:8888/~rp2y/Home.html |
+------------------------------------------------------------------------+
==============================================================================
To add/remove yourself to/from the POSTGRES mailing list: send mail with
the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU"
If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and
a human will deal with it. DO NOT post to the "postgres" mailing list.
==============================================================================
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: bytea data types
1994-08-16 12:41 Searching on seperate words in an attribute Eric P Dean <ericdean@iastate.edu>
1994-08-17 00:19 ` bytea data types Robert.Patrick@cs.cmu.edu
@ 1994-08-19 19:47 ` Paul M. Aoki <aoki@cs.berkeley.edu>
0 siblings, 0 replies; 4+ messages in thread
From: Paul M. Aoki @ 1994-08-19 19:47 UTC (permalink / raw)
To: Robert.Patrick@cs.cmu.edu; +Cc: legacy
Robert.Patrick@cs.cmu.edu writes:
> Postgres has a built-in byte array type (bytea). My question is how do
> I use this type? For example, let's say I have a small GIF file (or any
> other binary data) that I want to store as a byte array.
> create images (id =int4, contents=bytea)
> append images (id=1234, contents=?????????)
> What I really want to know is:
> 1.) What goes where the "??????????" are?
in general, if you want to know exactly what the syntax for a type
is, look in src/utils/adt (in this case, varlena.c). the syntax
for bytea appears to be the same as for strings (characters for
printables, \xxx for non-printables). i think i would use large
objects instead.
> 2.) If this can be done, is the big-endian, little-endian problem
> handled by Postgres or do I have to do it myself?
postgres does (almost) no byteswapping anywhere, including the
network connections.
--
Paul M. Aoki | University of California at Berkeley
aoki@CS.Berkeley.EDU | Dept. of EECS, Computer Science Division (#1776)
| Berkeley, CA 94720-1776
==============================================================================
To add/remove yourself to/from the POSTGRES mailing list: send mail with
the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU"
If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and
a human will deal with it. DO NOT post to the "postgres" mailing list.
==============================================================================
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Searching on seperate words in an attribute
1994-08-16 12:41 Searching on seperate words in an attribute Eric P Dean <ericdean@iastate.edu>
@ 1994-08-19 23:24 ` Paul M. Aoki <aoki@cs.berkeley.edu>
1 sibling, 0 replies; 4+ messages in thread
From: Paul M. Aoki @ 1994-08-19 23:24 UTC (permalink / raw)
To: Eric P Dean <ericdean@iastate.edu>; +Cc: legacy
Eric P Dean <ericdean@iastate.edu> writes:
> If I have an attribute "artist = Gogh, Vincent van" I would like to
> be able to locate the instance by doing a "retrieve (xxx.all) where
> xxx.artist = "gogh"" or "retrieve (xxx.all) where xxx.artist =
> "VAN"". I would like searches to be case-insensitive and have some
> type of truncation feature.
there are some regular expression operators, such as the text regex
operator "~":
where xxx.artist ~ "gogh"::text
or
where xxx.artist ~ "[vV][aA][nN]"::text
if you want case insensitivity as opposed to using case-conscious
regular expressions, you would have to hack on the routines in
src/utils/adt/regexp.c.
as with most of the abstract data type stuff, the source is the
ultimate documentation for its behavior.
--
Paul M. Aoki | University of California at Berkeley
aoki@CS.Berkeley.EDU | Dept. of EECS, Computer Science Division (#1776)
| Berkeley, CA 94720-1776
==============================================================================
To add/remove yourself to/from the POSTGRES mailing list: send mail with
the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU"
If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and
a human will deal with it. DO NOT post to the "postgres" mailing list.
==============================================================================
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~1994-08-19 23:24 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
1994-08-16 12:41 Searching on seperate words in an attribute Eric P Dean <ericdean@iastate.edu>
1994-08-17 00:19 ` bytea data types Robert.Patrick@cs.cmu.edu
1994-08-19 19:47 ` Re: bytea data types Paul M. Aoki <aoki@cs.berkeley.edu>
1994-08-19 23:24 ` Paul M. Aoki <aoki@cs.berkeley.edu>
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox