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:
load->library('setting');
对于预加载项可以使用 代码如下:
config->item();
进行获取
对于临时调取项可以使用 代码如下:
setting->item();
进行获取
首先,创建数据表
sql;">
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;">
_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 $this->settings;
}
// ------------------------------------------------------------------------
/**
* 获取单个设定
*
*
* settings->get('config_item');
?>
*
*/
public function item($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
PHP;">
/**
* 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。