Book Image

PostgreSQL Development Essentials

By : Manpreet Kaur, Baji Shaik
Book Image

PostgreSQL Development Essentials

By: Manpreet Kaur, Baji Shaik

Overview of this book

PostgreSQL is the most advanced open source database in the world. It is easy to install, configure, and maintain by following the documentation; however, it’s difficult to develop applications using programming languages and design databases accordingly. This book is what you need to get the most out of PostgreSQL You will begin with advanced SQL topics such as views, materialized views, and cursors, and learn about performing data type conversions. You will then perform trigger operations and use trigger functions in PostgreSQL. Next we walk through data modeling, normalization concepts, and the effect of transactions and locking on the database. The next half of the book covers the types of indexes, constrains, and the concepts of table partitioning, as well as the different mechanisms and approaches available to write efficient queries or code. Later, we explore PostgreSQL Extensions and Large Object Support in PostgreSQL. Finally, you will perform database operations in PostgreSQL using PHP and Java. By the end of this book, you will have mastered all the aspects of PostgreSQL development. You will be able to build efficient enterprise-grade applications with PostgreSQL by making use of these concepts
Table of Contents (17 chapters)
PostgreSQL Development Essentials
About the Authors
About the Reviewers

PHP-to-PostgreSQL connections

To make a connection to PostgreSQL from PHP, we have a set of built-in functions where we need to pass our connection string and a set of client options to make a connection. Here, we have the pg_connect() and pg_pconnect() functions in PHP that will get the connection from PostgreSQL.

Now, let's try a simple connection to Postgres using PHP:

$dbcon = pg_connect("host=localhost port=5432 dbname=postgres user=postgres"); 
if (!$dbcon) { 
  echo"Unable to make connection"; 
else { 
  echo"Successfully made connection to PostgreSQL\n"; 

To run the PHP code, we need to either embed the code in an HTML file and then call the web page or we can use the PHP command-line interface.

The result is as follows:

$ php /tmp/test.php 
Successfully made connection to PostgreSQL

In the preceding code, we used the pg_connect function to make a connection to the database. If this function...