By Hannu Krosing
Extend PostgreSQL utilizing PostgreSQL server programming to create, try, debug, and optimize quite a number user-defined features on your favourite programming language
About This Book
- Acquaint your self with the entire strategies to increase PostgreSQL utilizing the programming language of your selection equivalent to C++ and PL/Python
- Work with PostgreSQL 9.4 so that you can instantly make the most of the entire advancements and new features
- Utilize the large code examples and lots of novel assistance and methods for optimum functionality gain
Who This publication Is For
This booklet is for average to complicated PostgreSQL database execs who desire to expand PostgreSQL, using the main up-to-date positive factors of PostgreSQL 9.4. For a greater knowing of this e-book, familiarity with writing SQL, a uncomplicated suggestion of question tuning, and a few coding event on your hottest language is expected.
What you are going to Learn
- Write features within the integrated PL/pgSQL language or your language of choice
- Define and use user-defined services (UDF)
- Scale your info with PL/Proxy
- Extend PostgreSQL to beat the constraints of classical SQL servers
- Debug utilizing NOTIFY and utilizing PL/pgSQL debugging extensions
- Discover the recent positive factors in PostgreSQL 9.4 similar to occasion triggers and different advancements correct to server-side programming
- Fully combine the database layer into your development
This e-book will express you that PostgreSQL is a lot more than a database server. actually, it could actually also be obvious as an software improvement framework, with the extra bonuses of transaction help, immense info garage, journaling, restoration, and a bunch of alternative good points that the PostgreSQL engine provides.
You gets to grips with developing libraries of precious code, grouping them into much more worthy parts, and allotting them to the neighborhood. Then, you'll seriously look into user-defined capabilities, and the way to outline and make the most of them successfully. additionally, you will easy methods to extract information from a large number of international info assets and expand PostgreSQL to do it natively. what is extra, you are able to do all of this in a nifty debugging interface that might let you do it successfully and reliably. This e-book explores all attainable how one can expand PostgreSQL and write server-side code utilizing quite a few programming languages with concrete and easy-to-understand examples.
Read Online or Download PostgreSQL Server Programming - Second Edition PDF
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Additional resources for PostgreSQL Server Programming - Second Edition
In Debian/Ubuntu, this is performed via operating sudo apt-get set up python-imaging. On most recent Linux distributions, an alternate is to take advantage of Python's personal package deal distribution process by means of working sudo easy_install PIL. Sending an email the subsequent pattern is a functionality for sending e-mails from inside of a database functionality: CREATE OR change functionality send_email( sender textual content, -- sender electronic mail recipients textual content, -- comma-separated record of recipient addresses topic textual content, -- e-mail topic message textual content, -- textual content of the message smtp_server textual content -- SMTP server to exploit for sending ) RETURNS void AS $$ import smtplib; msg = "From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n%s" % \ (sender, recipients, topic, message) recipients_list = [r. strip() for r in recipients. split(',')] server = smtplib. SMTP(smtp_server) server. sendmail(sender, recipients_list, msg) server. quit() $$ LANGUAGE plpythonu; test=# decide on send_email('dummy@gmail. com', 'abv@postgresql. org', 'test subject', 'message', 'localhost'); This functionality codecs a message (msg = ""), converts a comma-separated To: handle right into a record of e mail addresses (recipients_list = [r. strip()... ), connects to a SMTP server, after which passes the message to the SMTP server for supply. to take advantage of this functionality in a construction method, it should most likely require a section extra checking at the codecs and a few additional blunders dealing with, in case whatever is going fallacious. you could learn extra approximately Python's smtplib at http://docs. python. org/library/smtplib. html. directory listing contents here's one other fascinating use case for an untrusted language. The functionality lower than can record the contents of a listing on your approach: CREATE OR exchange functionality list_folder( listing VARCHAR -- listing that would be walked ) RETURNS SETOF VARCHAR AS $$ import os; file_paths = ; # stroll the tree. for root, directories, records in os. walk(directory): for filename in documents: # sign up for the 2 strings on the way to shape the complete filepath. filepath = os. course. join(root, filename) file_paths. append(filepath) # upload it to the checklist. go back file_paths $$ LANGUAGE plpythonu; allow us to now try to run the functionality: test_db=# opt for list_folder('/usr/local/pgsql/bin'); list_folder ------------------------------------- /usr/local/pgsql/bin/clusterdb /usr/local/pgsql/bin/createdb /usr/local/pgsql/bin/createlang /usr/local/pgsql/bin/createuser /usr/local/pgsql/bin/dropdb /usr/local/pgsql/bin/droplang /usr/local/pgsql/bin/dropuser /usr/local/pgsql/bin/ecpg /usr/local/pgsql/bin/initdb /usr/local/pgsql/bin/pg_basebackup /usr/local/pgsql/bin/pg_config /usr/local/pgsql/bin/pg_controldata /usr/local/pgsql/bin/pg_ctl /usr/local/pgsql/bin/pg_dump /usr/local/pgsql/bin/pg_dumpall /usr/local/pgsql/bin/pg_isready /usr/local/pgsql/bin/pg_receivexlog /usr/local/pgsql/bin/pg_resetxlog /usr/local/pgsql/bin/pg_restore /usr/local/pgsql/bin/postgres /usr/local/pgsql/bin/postmaster /usr/local/pgsql/bin/psql /usr/local/pgsql/bin/reindexdb /usr/local/pgsql/bin/vacuumdb (24 rows) The functionality above makes use of the Python os module and walks the listing tree, top-down.