By Hannu Krosing
Extend PostgreSQL utilizing PostgreSQL server programming to create, try, debug, and optimize quite a number user-defined capabilities on your favourite programming language
About This Book
- Acquaint your self with the entire suggestions 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 reap the benefits of all of the advancements and new features
- Utilize the huge code examples and lots of novel information and methods for optimum functionality gain
Who This publication Is For
This e-book is for reasonable to complex PostgreSQL database pros who desire to expand PostgreSQL, using the main up to date beneficial properties of PostgreSQL 9.4. For a greater realizing of this booklet, familiarity with writing SQL, a simple proposal of question tuning, and a few coding adventure on your most popular language is expected.
What you are going to Learn
- Write services within the integrated PL/pgSQL language or your language of choice
- Define and use user-defined capabilities (UDF)
- Scale your info with PL/Proxy
- Extend PostgreSQL to beat the restrictions of classical SQL servers
- Debug utilizing NOTIFY and utilizing PL/pgSQL debugging extensions
- Discover the hot gains in PostgreSQL 9.4 akin 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 much more than a database server. in truth, it will probably also be obvious as an software improvement framework, with the additional bonuses of transaction help, huge information garage, journaling, restoration, and a number of different positive factors that the PostgreSQL engine provides.
You gets to grips with developing libraries of invaluable code, grouping them into much more priceless elements, and dispensing them to the group. Then, you are going to look at user-defined features, and the way to outline and make the most of them successfully. additionally, you will how you can extract info from a mess of international information 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 might let you do it successfully and reliably. This publication 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
As soon as the file_fdw module is put in, it is important to create the extension within the database: postgres=# CREATE EXTENSION file_fdw; CREATE EXTENSION Let's now create a pattern CSV dossier that makes use of the pipe, |, as a separator and includes a few worker facts: $ cat testdata. csv AARON, ELVIA J|WATER price TAKER|WATER MGMNT|81000. 00|73862. 00 AARON, JEFFERY M|POLICE OFFICER|POLICE|74628. 00|74628. 00 AARON, KIMBERLEI R|CHIEF agreement EXPEDITER|FLEET MANAGEMNT|77280. 00|70174. 00 Now, we must always create a overseas server that's pretty well a formality as the dossier is at the similar server. A international server generally includes the relationship details international info wrapper makes use of to entry an exterior info source. The server has to be precise in the database: CREATE SERVER file_server overseas information WRAPPER file_fdw; the next move, is to create a overseas desk that encapsulates our CSV dossier: CREATE international desk worker ( emp_name VARCHAR, job_title VARCHAR, dept VARCHAR, wage NUMERIC, sal_after_tax NUMERIC ) SERVER file_server innovations (format 'csv',header 'false' , filename '/home/pgbook/14/testdata. csv', delimiter '|', null '');''); The CREATE international desk command creates a overseas desk and the requirements of the dossier are supplied within the thoughts portion of the previous code. you could give you the layout, and if the 1st line of the dossier is a header (header 'false'), in our case there isn't any dossier header. We then give you the identify and course of the dossier and the delimiter utilized in the dossier, which in our case is the pipe image |. during this instance, we additionally specify that the null values will be represented as an empty string. Let's run a SQL command on our overseas desk: postgres=# pick out * from worker; -[ checklist 1 ]-+------------------------- emp_name | AARON, ELVIA J job_title | WATER cost TAKER dept | WATER MGMNT wage | 81000. 00 sal_after_tax | 73862. 00 -[ checklist 2 ]-+------------------------- emp_name | AARON, JEFFERY M job_title | POLICE OFFICER dept | POLICE wage | 74628. 00 sal_after_tax | 74628. 00 -[ checklist three ]-+------------------------- emp_name | AARON, KIMBERLEI R job_title | leader agreement EXPEDITER dept | FLEET MANAGEMNT wage | 77280. 00 sal_after_tax | 70174. 00 nice, feels like our facts is effectively loaded from the dossier. you can even use the \d meta command to determine the constitution of the worker desk: postgres=# \d worker; international desk "public. worker" Column | style | Modifiers | FDW ideas ---------------+-------------------+-----------+------------- emp_name | personality various | | job_title | personality various | | dept | personality various | | wage | numeric | | sal_after_tax | numeric | | Server: file_server FDW suggestions: (format 'csv', header 'false', filename '/home/pg_book/14/testdata. csv', delimiter '|', "null" '') you could run clarify at the question to appreciate what's going if you run a question at the overseas desk: postgres=# clarify opt for * FROM worker the place wage > 5000; question PLAN --------------------------------------------------------- overseas experiment on worker (cost=0.