CI(Codeigniter)的Setting增强配置类实例

本文实例讲述了Codeigniter的Setting增强配置类。分享给大家供大家参考，具体如下：

该增强配置类适用配置项要求比较灵活的项目。可实现预加载配置、组配置、单项调取、增、删、改配置，无需在改动config文档。

使用：

在需要的地方
代码如下:$this->load->library('setting');
对于预加载项可以使用 代码如下:$this->config->item();进行获取
对于临时调取项可以使用 代码如下:$this->setting->item();进行获取

首先，创建数据表

CREATE TABLE `system_settings` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `key` varchar(64) NOT NULL DEFAULT '', `value` mediumtext NOT NULL, `group` varchar(55) NOT NULL DEFAULT 'site', `autoload` enum('no','yes') NOT NULL DEFAULT 'yes', PRIMARY KEY (`id`,`key`), KEY `name` (`key`), KEY `autoload` (`autoload`)) ENGINE=MyISAM AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;

然后，在application/libraries目录下创建setting.php，内容如下

<?phpif (!defined('BASEPATH'))  exit('No direct script access allowed');class Setting {  private $_ci;  private $settings_autoloaded;  private $settings = array();  private $settings_group = array();  private $settings_db;  public function __construct() {    $this->_ci = &get_instance();    $this->settings_db = $this->_ci->config->item('settings_table');    $this->autoload();  }  // ------------------------------------------------------------------------  // 华丽的分割线 正式开始  // ------------------------------------------------------------------------  /**   * 从数据库获取所有自动加载的设置   */  public function autoload() {    //如果存在则直接返回    if (!empty($this->settings)) {      return $this->settings;    }    //如果系统不存在数据表则返回false    if (!$this->_ci->db->table_exists($this->settings_db)) {      return FALSE;    }    //查询标记为自动加载的项    $this->_ci->db->select('key,value')->from($this->settings_db)->where('autoload', 'yes');    $query = $this->_ci->db->get();    if ($query->num_rows() == 0) {      return FALSE;    }    //循环写入系统配置    foreach ($query->result() as $k => $row) {      $this->settings[$row->key] = $row->value;      $this->_ci->config->set_item($row->key, $row->value);    }    //标记会话，避免重复读库    //$this->_ci->session->set_userdata('settings_autoloaded', TRUE);    return $this->settings;  }  // ------------------------------------------------------------------------  /**   * 获取单个设定   *   * <code>   * <?php $this->settings->get('config_item');   ?>   * </code>   */  public function item($key) {    if (!$key) {      return FALSE;    }    //首先检查是否系统已经自动加载    if (isset($this->settings[$key])) {      return $this->settings[$key];    }    //查询数据库    $this->_ci->db->select('value')->from($this->settings_db)->where('key', $key);    $query = $this->_ci->db->get();    if ($query->num_rows() > 0) {      $row = $query->row();      $this->settings[$key] = $row->value;      return $row->value;    }    // 查询不到结果则查找系统config，返回值或者false    return $this->_ci->config->item($key);  }  // ------------------------------------------------------------------------  /**   * 获取组配置   */  public function group($group = '') {    if (!$group) {      return FALSE;    }    $this->_ci->db->select('key,value')->from($this->settings_db)->where('group', $group);    $query = $this->_ci->db->get();    if ($query->num_rows() == 0) {      return FALSE;    }    foreach ($query->result() as $k => $row) {      $this->settings[$row->key] = $row->value;      $arr[$row->key] = $row->value;    }    return $arr;  }  // ------------------------------------------------------------------------  /**   * 更改设置   */  public function edit($key, $value) {    $this->_ci->db->where('key', $key);    $this->_ci->db->update($this->settings_db, array('value' => $value));    if ($this->_ci->db->affected_rows() == 0) {      return FALSE;    }    return TRUE;  }  // ------------------------------------------------------------------------  /**   * 新增设置   */  public function insert($key, $value = '', $group = 'addon', $autoload = 'no') {    // 检查是否已经被添加的设置    $this->_ci->db->select('value')->from($this->settings_db)->where('key', $key);    $query = $this->_ci->db->get();    if ($query->num_rows() > 0) {      return $this->edit($key, $value);    }    $data = array('key' => $key, 'value' => $value, 'group' => $group, 'autoload' => $autoload, );    $this->_ci->db->insert($this->settings_db, $data);    if ($this->_ci->db->affected_rows() == 0) {      return FALSE;    }    return TRUE;  }  // ------------------------------------------------------------------------  /**   * 删除设置   */  public function delete($key) {    $this->_ci->db->delete($this->settings_db, array('key' => $key));    if ($this->_ci->db->affected_rows() == 0) {      return FALSE;    }    return TRUE;  }  // ------------------------------------------------------------------------  /**   * 删除设置组及成员配置   */  public function delete_group($group) {    $this->_ci->db->delete($this->settings_db, array('group' => $group));    if ($this->_ci->db->affected_rows() == 0) {      return FALSE;    }    return TRUE;  }}/* End of file Setting.php *//* Location: ./application/libraries/Setting.php */