a simple class for using the PostgreSQL database with PHP
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README.md

postgresql-php-tools

last modified: 10.05.2009 version: 0.0.6

Andreas Wenk (Hamburg, Germany)

a.wenk@netzmeister-st-pauli.de http://www.netzmeister-st-pauli.de

This is a small PHP class for interacting with a PostgreSQL database.

Preface:

Keep it simple. This class is as simple as possible but provides an easy way to interact with the PostgreSQL database. By the way - it's quite easy to adopt this class and it's methods for MySQL. Originally this was written for MySQL.

The target is to make live during coding a little easier and giving the ability not having to use the PHP pg_methods directly.

Following are some basic examples for the usage.

How to use:

Basically, you first open a connection to the database and then use the class methods in the well known OOP way.

Create the object:
	For security reasons it's good practice to have this in a
	conf file outside the DOCUMENT_ROOT 

	$db = new mod_pgsql();
	$db->connect(DB_HOST, DB_PORT, DB_DATABASE, DB_USER, DB_PASS);	

SELECT statement:
	The result is written into a array (in this case a associative array)

	$qs = "SELECT * from table";
	$res = $db->select($qs);

INSERT, UPDATE DELETE:
	These statements are all encapsulated in a transaction. Therfore, we put
	the statements into a array and then call the transaction method. If the
	transaction is commited it returns true and if not false.

	$qs = " INSERT INTO table (id, data) VALUES ({$id}, '{$data}')";
	$db->sql_add($qs);

	$qs = " UPDATE table SET data = '{$new_data}' WHERE id = {$id}";
	$db->sql_add($qs);

	$qs = " DELETE FROM table WHERE id = {$id}";
	$db->sql_add($qs);

	$db->transaction();
	
PREPARED STATEMENT:
	Let's say we have a lot of INSERT statements which we fire within a
	foreach loop. Generally, using a prepared statement is helping to
	improve performance.

	$qs = " INSERT INTO table (id,data) VALUES ($1, $2)";
	$db->prepare($qs, 'prep_name');

	foreach($data_array as $k => $v) {
		$db->execute('prep_name', array($k, $v));
	}		
	
	Using prepared statements with a SELECT statement is also supportetd. If
	using SELECT use the fetch() methjod to recieve a result array

	$qs = " SELECT data FROM table WHERE id = $1";
	$db->prepare($qs, 'prep_name');

	$result_array = array();
	foreach($id_array as $v) {
		$res_id = $db->execute('prep_name', array($v['id']));
		$result_array[] = $db->fetch($res_id);
	}

Changelog:

10.05.2009: 0.0.6 - new method fetch() - when exception handling is integrated, added @ before PHP pg_ method to avoid errors, warnings and notice - updated README.md 02.05.2009: 0.0.1 - fix some typo's in README.md 30.04.2009: 0.0.1 - first commit - fill the README