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<?php
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/**
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* Base Data class
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*
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* @author Zhou Yuan <yuanzhou19@gmail.com>
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* @link http://www.infopotato.com/
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* @copyright Copyright © 2009-2011 Zhou Yuan
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* @license http://www.opensource.org/licenses/mit-license.php MIT Licence
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*/
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class Data {
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/**
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* Database object instance
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* @var object
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*/
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protected $db;
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/**
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* Constructor
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*
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* RDBMS connection needs to be specified in the subclass's constructor
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* One database connection for one data file
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*
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* @param string connection RDBMS connection name
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* @return void
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*/
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public function __construct($connection = '') {
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if ($connection !== '') {
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$this->db = self::_create_db_obj($connection);
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}
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}
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/**
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* Create database object, only when RDBMS is used
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*
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* @param string $connection database connection pool, e.g., 'mysql_dao:default'
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* @return a specific database access object
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*/
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private static function _create_db_obj($connection) {
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static $db_obj = array();
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if (isset($db_obj[$connection])) {
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// Returns object from runtime cache
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return $db_obj[$connection];
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}
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// Parse the connection string
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$conn = explode(':', $connection);
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if ( ! empty($conn)) {
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// Load data source config
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$data_source = require_once APP_CONFIG_DIR.'data_source.php';
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// Checks if data config exists
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//if (array_key_exists($conn[0], $data_source) && array_key_exists($conn[1], $data_source[$conn[0]])) {
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//halt('An Error Was Encountered', 'Incorrect database connection string', 'sys_error');
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//}
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// Create instance
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$db_obj[$connection] = new $conn[0]($data_source[$conn[0]][$conn[1]]);
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return $db_obj[$connection];
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}
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}
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}
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// End of file: ./system/core/data.php
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Page URI: http://www.infopotato.com/index.php/code/core/data/