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

复制代码 代码如下:$this->load->library('setting');

对于预加载项可以使用复制代码 代码如下:$this->config->item();进行获取

对于临时调取项可以使用复制代码 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





<?php

if (!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 */







最后，打开application/config/config.php，新增





/**

 * 系统配置表名

 */

$config['settings_table'] = "system_settings";







希望本文所述对大家基于Codeigniter框架的PHP程序设计有所帮助。