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UPdate developers faq

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Bruce Momjian
2000-06-10 01:55:37 +00:00
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doc/FAQ_DEV
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Developer's Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri Dec 24 11:43:42 EST 1999
Last updated: Fri Jun 9 21:54:54 EDT 2000
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -91,11 +91,11 @@ s
or
; Cmd to set tab stops &etc for working with PostgreSQL code
(c-add-style "pgsql"
'("bsd"
'("bsd"
(indent-tabs-mode . t)
(c-basic-offset . 4)
(tab-width . 4)
(c-offsets-alist .
(c-offsets-alist .
((case-label . +))))
t) ; t = set this mode on
@ -309,8 +309,8 @@ c-mode)
you to query the system catalogs. This is the preferred way to access
system tables, because the first call to the cache loads the needed
rows, and future requests can return the results without accessing the
base table. Some of the caches use system table indexes to look up
tuples. A list of available caches is located in
base table. The caches use system table indexes to look up tuples. A
list of available caches is located in
src/backend/utils/cache/syscache.c.
src/backend/utils/cache/lsyscache.c contains many column-specific
cache lookup functions.
@ -353,11 +353,12 @@ c-mode)
is to use heap_tuplemodify() and pass it your palloc'ed tuple, and the
values you want changed. It returns another palloc'ed tuple, which you
pass to heap_replace(). You can delete tuples by passing the tuple's
t_self to heap_destroy(). Remember, tuples can be either system cache
versions, which may go away soon after you get them, buffer cache
version, which will go away when you heap_getnext(), heap_endscan, or
ReleaseBuffer(), in the heap_fetch() case. Or it may be a palloc'ed
tuple, that you must pfree() when finished.
t_self to heap_destroy(). You can use it for heap_update() too.
Remember, tuples can be either system cache versions, which may go
away soon after you get them, buffer cache versions, which go away
when you heap_getnext(), heap_endscan, or ReleaseBuffer(), in the
heap_fetch() case. Or it may be a palloc'ed tuple, that you must
pfree() when finished.
10) What is elog()?