An article at WebProNews quoted from the PG docs as to the merits of
stored procedures. I have added a bit more material on their merits,
as well as making a few changes to improve the introductions to
PL/Perl and PL/Tcl.
Index: plperl.sgml
===
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/plperl.sgml,v
retrieving revision 2.52
diff -c -u -r2.52 plperl.sgml
--- plperl.sgml 10 Mar 2006 19:10:48 - 2.52
+++ plperl.sgml 25 May 2006 22:38:45 -
@@ -17,6 +17,12 @@
ulink url=http://www.perl.com;Perl programming language/ulink.
/para
+ para The usual advantage to using PL/Perl is that this allows use,
+ within stored functions, of the manyfold quotestring
+munging/quote operators and functions available for Perl. Parsing
+ complex strings may be be easier using Perl than it is with the
+ string functions and control structures provided in PL/pgsql./para
+
para
To install PL/Perl in a particular database, use
literalcreatelang plperl replaceabledbname//literal.
Index: plpgsql.sgml
===
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/plpgsql.sgml,v
retrieving revision 1.88
diff -c -u -r1.88 plpgsql.sgml
--- plpgsql.sgml10 Mar 2006 19:10:48 - 1.88
+++ plpgsql.sgml25 May 2006 22:38:46 -
@@ -155,21 +155,36 @@
para
That means that your client application must send each query to
- the database server, wait for it to be processed, receive the
- results, do some computation, then send other queries to the
- server. All this incurs interprocess communication and may also
- incur network overhead if your client is on a different machine
- than the database server.
+ the database server, wait for it to be processed, receive and
+ process the results, do some computation, then send further
+ queries to the server. All this incurs interprocess
+ communication and will also incur network overhead if your client
+ is on a different machine than the database server.
/para
para
- With applicationPL/pgSQL/application you can group a block of
computation and a
- series of queries emphasisinside/emphasis the
- database server, thus having the power of a procedural
- language and the ease of use of SQL, but saving lots of
- time because you don't have the whole client/server
- communication overhead. This can make for a
- considerable performance increase.
+ With applicationPL/pgSQL/application you can group a block of
+ computation and a series of queries emphasisinside/emphasis
+ the database server, thus having the power of a procedural
+ language and the ease of use of SQL, but with considerable
+ savings because you don't have the whole client/server
+ communication overhead.
+/para
+itemizedlist
+
+ listitempara Elimination of additional round trips between
+ client and server /para/listitem
+
+ listitempara Intermediate results that the client does not
+ need do not need to be marshalled or transferred between server
+ and client /para/listitem
+
+ listitempara There is no need for additional rounds of query
+ parsing /para/listitem
+
+/itemizedlist
+para This can allow for a considerable performance increase as
+compared to an application that does not use stored functions.
/para
para
Index: pltcl.sgml
===
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/pltcl.sgml,v
retrieving revision 2.39
diff -c -u -r2.39 pltcl.sgml
--- pltcl.sgml 10 Mar 2006 19:10:48 - 2.39
+++ pltcl.sgml 25 May 2006 22:38:46 -
@@ -25,22 +25,27 @@
titleOverview/title
para
-PL/Tcl offers most of the capabilities a function
-writer has in the C language, except for some restrictions.
+PL/Tcl offers most of the capabilities a function writer has in
+the C language, with a few restrictions, and with the addition of
+the powerful string processing libraries that are available for
+Tcl.
/para
para
-The good restriction is that everything is executed in a safe
-Tcl interpreter. In addition to the limited command set of safe Tcl, only
-a few commands are available to access the database via SPI and to raise
-messages via functionelog()/. There is no way to access internals of
the
-database server or to gain OS-level access under the permissions of the
-productnamePostgreSQL/productname server process, as a C function can
do.
-Thus, any unprivileged database user may be
-permitted to use this language.
+One compelling emphasisgood/emphasis restriction is that
+everything is executed from within the safety of the context of a
+Tcl interpreter. In addition to the limited command set of safe
+Tcl, only a few commands are
