本文實例講述了Codeigniter的Setting增強配置類。分享給大家供大家參考，具體如下：
該增強配置類適用配置項要求比較靈活的項目。可實現預加載配置、組配置、單項調取、增、刪、改配置，無需在改動config文檔。
使用：
在需要的地方
復制代碼 代碼如下:$this->load->library('setting');
對於預加載項可以使用復制代碼 代碼如下:$this->config->item();進行獲取
對於臨時調取項可以使用復制代碼 代碼如下:$this->setting->item();進行獲取
首先，創建數據表
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;
然後，在application/libraries目錄下創建setting.php，內容如下
<?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');
$this->autoload();
}
// ------------------------------------------------------------------------
// 華麗的分割線 正式開始
// ------------------------------------------------------------------------
/**
* 從數據庫獲取所有自動加載的設置
*/
public function autoload() {
//如果存在則直接返回
if (!empty($this->settings)) {
return $this->settings;
}
//如果系統不存在數據表則返回false
if (!$this->_ci->db->table_exists($this->settings_db)) {
return FALSE;
}
//查詢標記為自動加載的項
$this->_ci->db->select('key,value')->from($this->settings_db)->where('autoload', 'yes');
$query = $this->_ci->db->get();
if ($query->num_rows() == 0) {
return FALSE;
}
//循環寫入系統配置
foreach ($query->result() as $k => $row) {
$this->settings[$row->key] = $row->value;
$this->_ci->config->set_item($row->key, $row->value);
}
//標記會話，避免重復讀庫
//$this->_ci->session->set_userdata('settings_autoloaded', TRUE);
return $this->settings;
}
// ------------------------------------------------------------------------
/**
* 獲取單個設定
*
* <code>
* <?php $this->settings->get('config_item');
?>
* </code>
*/
public function item($key) {
if (!$key) {
return FALSE;
}
//首先檢查是否系統已經自動加載
if (isset($this->settings[$key])) {
return $this->settings[$key];
}
//查詢數據庫
$this->_ci->db->select('value')->from($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;
}
// 查詢不到結果則查找系統config，返回值或者false
return $this->_ci->config->item($key);
}
// ------------------------------------------------------------------------
/**
* 獲取組配置
*/
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 $arr;
}
// ------------------------------------------------------------------------
/**
* 更改設置
*/
public function edit($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;
}
// ------------------------------------------------------------------------
/**
* 新增設置
*/
public function insert($key, $value = '', $group = 'addon', $autoload = 'no') {
// 檢查是否已經被添加的設置
$this->_ci->db->select('value')->from($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;
}
// ------------------------------------------------------------------------
/**
* 刪除設置
*/
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;
}
// ------------------------------------------------------------------------
/**
* 刪除設置組及成員配置
*/
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 */
最後，打開application/config/config.php，新增
/** * 系統配置表名 */ $config['settings_table'] = "system_settings";
希望本文所述對大家基於Codeigniter框架的PHP程序設計有所幫助。
