Developer's Frequently Asked Questions (FAQ) for PostgreSQL

Last updated: FriDec 24 11:43:42 EST 1999

Last updated: FriJun 9 21:54:54 EDT 2000

Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)

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

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 thecaches use system table indexes to look up

tuples. Alist of available caches is located in

base table.Thecaches 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.

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()?

Developer's Frequently Asked Questions (FAQ) for PostgreSQL

Last updated:FriDec 24 11:43:42 EST 1999

Last updated:FriJun 9 21:54:54 EDT 2000

Current maintainer:Bruce Momjian (<a

href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<BR>

M-x set-variable tab-width

or

; Cmd to set tab stops &etc for working with PostgreSQL code

(defun pgsql-mode ()

"Set PostgreSQL C indenting conventions in current buffer."

(interactive)

(c-mode) ; necessary to make c-set-offset local!

(setq tab-width 4) ; already buffer-local

; (setq comment-column 48) ; already buffer-local

(c-set-style "bsd")

(c-set-offset 'case-label '+)

)

(c-add-style "pgsql"

'("bsd"

(indent-tabs-mode . t)

(c-basic-offset . 4)

(tab-width . 4)

(c-offsets-alist .

((case-label . +))))

t) ; t = set this mode on

and add this to your autoload list (modify file path in macro):