This article describes two methods for connecting to a PostgreSQL database using PHP:
PHP provides many functions for working directly with PostgreSQL databases.
To connect to PostgreSQL using native functions, follow these steps:
<?php $db_connection = pg_connect("host=localhost dbname=dbname user=username password=password"); ?>
After the code connects to PostgreSQL and selects the database, you can run SQL queries and perform other operations. For example, the following PHP code runs a SQL query that extracts the last names from the employees table, and stores the result in the $result variable:
<?php $result = pg_query($db_connection, "SELECT lastname FROM employees"); ?>
The PostgreSQL functions in the previous procedure can only be used with PostgreSQL databases. PDO abstracts database access, and enables you to use code that can handle different types of databases.
To connect to PostgreSQL using PDO, follow these steps:
<?php $myPDO = new PDO('pgsql:host=localhost;dbname=dbname', 'username', 'password'); ?>
After the code connects to PostgreSQL and selects the database, you can run SQL queries and perform other operations. For example, the following PHP code runs a SQL query that extracts the last names from the employees table, and stores the result in the $result variable:
<?php $result = $myPDO->query("SELECT lastname FROM employees"); ?>
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