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
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。
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