Zebra_Database

A compact (one-file only), lightweight yet feature-rich PHP MySQLi database wrapper providing methods for interacting with MySQL databases that are more secure, powerful and intuitive than PHP's default ones.

Zebra_Database supports transactions and provides ways for caching query results either by saving cached data to the disk, in the session, or by using memcache.

The library provides a comprehensive debugging interface with detailed information about the executed queries: execution time, returned/affected rows, excerpts of the found rows, error messages, backtrace information, etc. It can also automatically EXPLAIN SELECT queries (so you don't miss those keys again!).

It encourages developers to write maintainable code and provides a better default security layer by encouraging the use of prepared statements, where parameters are automatically escaped.

The code is heavily commented and generates no warnings/errors/notices when PHP's error reporting level is set to E_ALL.

📚 Documentation

Support the development of this library

Features

it uses the mysqli extension extension for communicating with the database instead of the old mysql extension, which is officially deprecated as of PHP v5.5.0 and will be removed in the future; this is not a wrapper for the PDO extension which is already a wrapper in itself!
offers lots of powerful methods for easier interaction with MySQL
supports unbuffered queries
provides a better security layer by encouraging the use of prepared statements, where parameters are automatically escaped
provides a very detailed debugging interface with lots of useful information about executed queries; it also automatically EXPLAINs each SELECT query
supports caching of query results to the disk, in the session, or to a memcache server
has really good documentation
code is heavily commented and generates no warnings/errors/notices when PHP's error reporting level is set to E_ALL

Requirements

PHP 5.2.0+ with the mysqli extension activated, MySQL 4.1.22+

For using memcache as caching method, PHP must be compiled with the memcache extension and, if memcache_compressed property is set to TRUE, needs to be configured with –with-zlib[=DIR]

Installation

Download the latest version, unpack it, and load it in your project

require_once 'Zebra_Database.php';

Installation with Composer

You can install Zebra_Database via Composer

composer require stefangabos/zebra_database

How to use

Connecting to a database

// instantiate the library
$db = new Zebra_Database();

// connect to a server and select a database
$db->connect('host', 'username', 'password', 'database');

Running queries

// question marks will re replaced automatically with the escaped values from the array
// I ENCOURAGE YOU TO WRITE YOUR QUERIES IN A READABLE FORMAT, LIKE BELOW
$db->query('
    SELECT
    	column1,
        column2,
        column3
    FROM
    	tablename1
    	LEFT JOIN tablename2 ON tablename1.column1 = tablename2.column1
    WHERE
    	somecriteria = ? AND
        someothercriteria = ?
', array($somevalue, $someothervalue));

// any fetch method will work with the last result so
// there's no need to explicitly pass that around

// you could fetch all records to one associative array...
$records = $db->fetch_assoc_all();

// you could fetch all records to one associative array
// using the values in a specific column as keys
$records = $db->fetch_assoc_all('column1');

// or fetch records one by one, as associative arrays
while ($row = $db->fetch_assoc()) {
    // do stuff
}

An INSERT statement

// notice that you can use MySQL functions in values
$db->insert(
    'tablename',
    array(
        'column1'      => $value1,
        'column2'      => $value2,
        'date_updated' => 'NOW()'
    )
);

An UPDATE statement

// $criteria will be escaped and enclosed in grave accents, and will
// replace the corresponding ? (question mark) automatically
// also, notice that you can use MySQL functions in values
// when using MySQL functions, the value will be used as it is without being escaped!
// while this is ok when using a function without any arguments like NOW(), this may
// pose a security concern if the argument(s) come from user input.
// in this case we have to escape the value ourselves
$db->update(
    'tablename',
    array(
        'column1'      => $value1,
        'column2'      => 'TRIM(UCASE("value2"))',
        'column3'      => 'TRIM(UCASE("'' . $db->escape($value3) . "))',
        'date_updated' => 'NOW()'
    ),
    'criteria = ?',
    array($criteria)
);

There are over 40 methods and 20 properties that you can use and lots of things you can do with this library. I've prepared an awesome documentation so that you can easily get an overview of what can be done. Go ahead, check it out!

otzi122/Zebra_Database