By Hannu Krosing
Extend PostgreSQL utilizing PostgreSQL server programming to create, try, debug, and optimize various user-defined services on your favourite programming language
About This Book
- Acquaint your self with all of the 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 all of the advancements and new features
- Utilize the huge code examples and plenty of novel suggestions and methods for max functionality gain
Who This publication Is For
This e-book is for average 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 figuring out of this ebook, familiarity with writing SQL, a uncomplicated concept 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 capabilities (UDF)
- Scale your information with PL/Proxy
- Extend PostgreSQL to beat the constraints of classical SQL servers
- Debug utilizing NOTIFY and utilizing PL/pgSQL debugging extensions
- Discover the hot positive aspects in PostgreSQL 9.4 reminiscent of occasion triggers and different advancements appropriate 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. in reality, it might also be visible as an software improvement framework, with the extra bonuses of transaction aid, sizeable facts garage, journaling, restoration, and a number of alternative gains that the PostgreSQL engine provides.
You gets to grips with growing libraries of valuable code, grouping them into much more helpful parts, and dispensing them to the group. Then, you'll have a look at user-defined services, and the way to outline and make the most of them successfully. additionally, you will extract facts from a mess of international 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 may let you do it successfully and reliably. This publication explores all attainable how you can expand PostgreSQL and write server-side code utilizing a number of programming languages with concrete and easy-to-understand examples.
Read or Download PostgreSQL Server Programming - Second Edition PDF
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Extra info for PostgreSQL Server Programming - Second Edition
Iterating over cursors back from one other functionality To wrap up our cursors' dialogue, let's wade through an instance of returning a cursor after which iterating over the lower back cursor in one other PL/pgSQL functionality: First, let's create a five-row desk and fill it with data:CREATE desk fiverows(id serial fundamental KEY, information text); INSERT INTO fiverows(data) VALUES ('one'), ('two'), ('three'), ('four'), ('five'); subsequent, let's outline our cursor returning functionality. This functionality will open a cursor for a question, in line with its argument after which go back that cursor:CREATE functionality curtest1(cur refcursor, tag textual content) RETURNS refcursor AS $$ start OPEN cur FOR choose identification, info || '+' || tag FROM fiverows; go back cur; finish; $$ LANGUAGE plpgsql; subsequent, we outline a functionality, which makes use of the functionality we simply created to open extra cursors, after which strategy the question effects. to teach that we're not dishonest and that the functionality rather creates the cursors, we use the functionality two times and iterate over the implications in parallel:CREATE functionality curtest2(tag1 textual content, tag2 textual content) RETURNS SETOF fiverows AS $$ claim cur1 refcursor; cur2 refcursor; row list; commence cur1 = curtest1(NULL, tag1); cur2 = curtest1(NULL, tag2); LOOP FETCH cur1 INTO row; go out whilst no longer discovered ; go back subsequent row; FETCH cur2 INTO row; go out whilst now not came across ; go back subsequent row; finish LOOP; finish; $$ LANGUAGE plpgsql; Please observe, that after a checklist variable inside of a plpgsql functionality is outlined via getting used, it cannot be replaced from list variety at some stage in that consultation simply because PL/pgSQL shops and reuses the plan equipped with the list kind. via passing in NULL to the 1st parameters of curtest1, PostgreSQL instantly generates the cursor names in order that a number of invocations of this functionality won't get identify conflicts with the other features, which additionally create cursors. Wrapping up of features returning cursors the professionals of utilizing cursors are as follows: Cursors are a useful gizmo for those who don't desire to constantly execute the question and look ahead to the complete outcome set ahead of coming back from a functionCurrently, also they are the single strategy to go back a number of consequence units out of a user-defined functionality The cons of utilizing cursors are as follows: They mostly paintings to move facts among capabilities at the server, and also you are nonetheless constrained to at least one list set consistent with name lower back to the database clientThey are often complicated to take advantage of, and sure and unbound cursors will not be constantly interchangeable notice you could learn extra approximately cursors at http://www. postgresql. org/docs/current/static/plpgsql-cursors. html. alternative ways to paintings with established facts we've got coated the conventional methods of returning units of established info from services. we are going to now begin with the extra attention-grabbing half. different how to go round advanced info buildings have advanced on the planet. complicated facts forms for the trendy international – XML and JSON within the genuine global, lots of the information isn't in one desk and the database isn't the major factor that almost all programmers concentrate on.