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<?php
/**
* CinisisDb main class.
*/
class CinisisDb {
/**
* @var $db
* Database resource.
*/
var $db;
/**
* @var $implementation
* Database implementation.
*/
var $implementation;
/**
* Constructor.
*
* @param $config
* Optional parameter to set alternative config file or array
* with configuration.
*/
function __construct($config = NULL) {
$this->open($config);
}
/**
* Open an ISIS database.
*
* @param $config
* Optional parameter to set alternative config file or array
* with configuration.
*/
public function open($config)
{
try {
// Check main configuration.
$config = $this->parse($this->file($config));
// Set database implementation.
$this->implementation = $config['implementation'] .'Db';
// Check database schema.
$schema = $this->parse($this->file($config['database'] .'.yaml', 'schemas'), $this->implementation);
} catch (Exception $e) {
echo __CLASS__ .' caught exception: ', $e->getMessage(), "\n";
return FALSE;
}
// Setup database connection.
$this->db = new $this->implementation($schema);
}
/**
* Config file load.
*
* @param $file
* Config file.
*
* @return
* Array with configuration or FALSE if error.
*/
public function load($file) {
if (!file_exists($file)) {
throw new Exception('Config '. $file .' not found.');
return FALSE;
}
// Load configuration.
return Spyc::YAMLLoad($file);
}
/**
* Parse configuration.
*
* @param $config
* Config file or array with configuration.
*
* @param $class
* Configuration class name.
*
* @return
* Array with configuration or FALSE on error.
*/
public function parse($config, $class = __CLASS__) {
// Load configuration if needed.
if (!is_array($config)) {
$config = $this->load($config);
}
// Check configuration.
return call_user_func(array($class, 'check'), $config);
}
/**
* Check configuration.
*
* @param $config
* Config file or array with configuration.
*
* @return
* Array with configuration or FALSE on error.
*/
static function check($config) {
// Set default database backend if needed.
if (!isset($config['implementation'])) {
$config['implementation'] = 'PhpIsis';
}
// Check database configuration.
if (!isset($config['database'])) {
throw new Exception('No database set on configuration.');
return FALSE;
}
return $config;
}
/**
* Get library base folder.
*
* @return
* Return base folder.
*/
static function base() {
return dirname(__FILE__) .'/../';
}
/**
* Get a file path.
*
* @param $config
* Config file name (either relative to the library or absolute)
* or array with configuration.
*
* @param $section
* Config file section (ignored for absolute files).
*
* @return
* Return the assembled file path.
*/
static function file($config = NULL, $section = 'config') {
// Check config format (array, NULL or relative config path).
if (is_array($config)) {
return $config;
}
elseif ($config == NULL) {
$config = "$section/config.yaml";
}
elseif (substr($config, 0, 1) != '/') {
$config = "$section/$config";
}
return call_user_func(array(__CLASS__, 'base')) .'/'. $config;
}
/**
* Whether to join field and subfields in a single array.
*
* @param $format
* Database format.
*
* @return
* Boolean.
*/
static function join_subfields($format) {
if ($format['db']['join_subfields']) {
return TRUE;
}
return FALSE;
}
/**
* Determine the main field name depending on db configuration.
*
* @param $key
* Field key.
*
* @param $format
* Database format.
*
* @return
* Main field name, 'field' by default.
*/
static function main_field_name($format, $key) {
if (self::join_subfields($format)) {
return $format['fields'][$key]['name'];
}
return 'field';
}
}
|
