PDOLoad

PDOLoad is a small PDO wrapper/abstraction layer to provide read/write endpoints and load balancing capabilities in one line of code. Load balancing is usually include within most major PHP Frameworks however when working with large legacy projects it's hard to come by.

Main Features

• Add multiple read and write endpoints.
• One line implementation. No need to rewrite your PDO queries.
• Transaction aware. Any reads while a transaction is active will be performed on the write connection.

Getting started

• PHP >= 7.0 is required
• Install PDOLoad using composer (recommmended) or manually
• Configure your connections and you're ready to go!

Installing with Composer

composer require gonzie/pdoload

How to use

PDOLoad gives you as much choice as possible with little to no modification required. A normal PDO connection would be set like:

$dbh = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8mb4', 'username', 'password');

(most basic set up)

To use a minimalistic version of PDOLoad you would amend the code as follows:

$dbh = new Gonzie\PDOLoad\PDOLoad('mysql:host=localhost;dbname=testdb;charset=utf8mb4', 'username', 'password');

Alternatively, to use PDOLoad to it's full abilities, and for what it was actually made for, you can set up by passing an array with settings.

<?php
$settings = [
    'driver' => 'mysql',
    'reader' => [
        [
            'host' => 'mysuperduperdbreader_1.com',
            'dbname' =>  'test',
            'user' => 'gonzie',
            'password' => 'password',
            'port' => '3306'
            'charset' => 'utf8mb4',
        ],
        [
            'host' => 'mysuperduperdbreader_2.com',
            'dbname' =>  'test',
            'user' => 'gonzie',
            'password' => 'password',
            'charset' => 'utf8mb4',
        ],
    ],
    'writer' => [
        [
            'host' => 'mysuperduperdbwriter_1.com',
            'dbname' =>  'test',
            'user' => 'gonzie',
            'password' => 'password',
            'charset' => 'utf8mb4',
        ],
    ],
    'balancer' => 'round-robin',
];

$dbh = new Gonzie\PDOLoad\PDOLoad($settings);

Easy right? Here's a breakdown of the settings array:

Field	Type	Description
driver	string	Optional, default is mysql. Available options: pdo_mysql, drizzle_pdo_mysql, mysqli, pdo_sqlite, pdo_pgsql, pdo_oci, pdo_sqlsrv, sqlsrv, oci8, sqlanywhere
reader	array[connection]	Required. Array of connection arrays.
writer	array[connection]	Required. Array of connection arrays.
balancer	string	Optional, default is . Available options: round-robin - go from top to bottom of connection's array, fixed - PDOLoad will pick a connection at random and stick to it, random - each query will pick a random connection.
overwrite_allowed	string	Optional, default is false. Some driver options require additional options other than the ones in the connection array, set this value to true if you need to add custom options to the array otherwise they won't be allowed.

Connection array

Other options can be added to your liking as long as overwrite_allowed is set to true.

Field	Type	Description
host	string	Required.
dbname	string	Optional.
user	string	Required.
password	string	Required.
charset	string	Optional, default is utf8mb4.

Contributing

Any changes to the Project must abide by PSR Standards (PSR 2 - 12, PSR4 and others where applicable).

Please run phpcs before committing any code.

./vendor/bin/phpcs --standard=psr2 src/