PostgreSQL Server Programming - Second Edition

By Hannu Krosing

Extend PostgreSQL utilizing PostgreSQL server programming to create, try, debug, and optimize various user-defined capabilities on your favourite programming language

About This Book

  • Acquaint your self with the entire innovations to increase PostgreSQL utilizing the programming language of your selection similar 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 vast code examples and plenty of novel suggestions and tips for max functionality gain

Who This booklet Is For

This ebook is for reasonable to complicated PostgreSQL database execs who desire to expand PostgreSQL, using the main up to date good points of PostgreSQL 9.4. For a greater realizing of this booklet, familiarity with writing SQL, a simple inspiration of question tuning, and a few coding adventure on your hottest language is expected.

What you are going to Learn

  • Write capabilities within the integrated PL/pgSQL language or your language of choice
  • Define and use user-defined features (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 beneficial properties in PostgreSQL 9.4 equivalent to occasion triggers and different advancements proper to server-side programming
  • Fully combine the database layer into your development

In Detail

This ebook will express you that PostgreSQL is a lot more than a database server. in reality, it could possibly also be visible as an program improvement framework, with the further bonuses of transaction aid, colossal info garage, journaling, restoration, and a bunch of different beneficial properties that the PostgreSQL engine provides.

You gets to grips with growing libraries of beneficial code, grouping them into much more beneficial parts, and dispensing them to the neighborhood. Then, you are going to seriously look into user-defined features, and the way to outline and make the most of them successfully. additionally, you will find out how to extract information from a mess of overseas info resources and expand PostgreSQL to do it natively. what is extra, you are able to do all of this in a nifty debugging interface that would let you do it successfully and reliably. This ebook explores all attainable how you can expand PostgreSQL and write server-side code utilizing quite a few programming languages with concrete and easy-to-understand examples.

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Word you could view all of the on hand built-ins and application services to be had in PL/Perl at http://www. postgresql. org/docs/current/static/plperl-builtins. html. Our set off functionality returns the distinctive values "MODIFY" and "SKIP" on the subject of replace and DELETE, respectively. If a PL/Perl set off functionality returns "MODIFY", it implies that the recent price has been converted through the set off functionality. If a set off functionality modifies a brand new price yet doesn't go back "MODIFY", then the swap performed through the functionality might be discarded.

For instance, when you have a functionality to create numerous clients in a single name and also you nonetheless are looking to be capable of use it after partitioning, the break up assertion is how to inform PL/Proxy to separate the arrays among the walls according to the partitioning functionality: CREATE or substitute functionality create_new_users( IN i_username text[], IN i_pwdhash text[], IN i_email text[], OUT prestige int, OUT message textual content ) RETURNS SETOF list AS $$ start FOR i IN 1.. array_length(i_username,1) LOOP pick out * INTO prestige, message FROM new_user(i_username[i], i_pwdhash[i], i_email[i]); go back subsequent; finish LOOP; finish; $$ LANGUAGE plpgsql protection DEFINER; the next PL/Proxy functionality definition, created at the proxy database, can be utilized to separate the calls around the walls: CREATE or substitute functionality create_new_users( IN i_username text[], IN i_pwdhash text[], IN i_email text[], OUT prestige int, OUT message textual content ) RETURNS SETOF checklist AS $$ CLUSTER 'messaging'; RUN ON hashtext(i_username); cut up i_username, i_pwdhash, i_email; $$ LANGUAGE plproxy safeguard DEFINER; it might be known as by way of sending in 3 arrays to the functionality: decide on * FROM create_new_users( ARRAY['bob', 'jane', 'tom'], ARRAY[md5('bobs_pwd'), md5('janes_pwd'), md5('toms_pwd')], ARRAY['bob@mail.

We should always most likely follow utilizing MySQL. After interviewing all seven builders that have been influential at the venture, i discovered that the one individual with no hands-on event with PostgreSQL used to be the undertaking supervisor. because the venture supervisor did not count on to have any technical involvement within the venture, he licensed the choice of PostgreSQL. PostgreSQL is without doubt one of the soiled little secrets and techniques of net builders. they've got concerning the similar point of familiarity with it as they do with encryption and safety.

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You just execute sudo make set up and every little thing might be copied to the best position, $sudo make set up: [sudo] password for hannu: /bin/mkdir -p '/usr/lib/postgresql/9. 3/lib' /bin/sh /usr/lib/postgresql/9. 3/lib/pgxs/src/makefiles/.. /.. /config/install-sh -c -m 755 add_func. so '/usr/lib/postgresql/9. 3/lib/' CREATE functionality add(int, int) you're only one step clear of with the ability to use this functionality on your database. you simply have to introduce the module you simply compiled to a PostgreSQL database utilizing the CREATE functionality assertion.

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