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- <?php
- // +----------------------------------------------------------------------
- // | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
- // +----------------------------------------------------------------------
- // | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
- // +----------------------------------------------------------------------
- // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
- // +----------------------------------------------------------------------
- // | Author: liu21st <liu21st@gmail.com>
- // +----------------------------------------------------------------------
- /**
- * ThinkPHP 简洁模式Model模型类
- * 只支持原生SQL操作 支持多数据库连接和切换
- */
- class Model {
- // 当前数据库操作对象
- protected $db = null;
- // 数据表前缀
- protected $tablePrefix = '';
- // 模型名称
- protected $name = '';
- // 数据库名称
- protected $dbName = '';
- // 数据表名(不包含表前缀)
- protected $tableName = '';
- // 实际数据表名(包含表前缀)
- protected $trueTableName ='';
- // 最近错误信息
- protected $error = '';
- /**
- * 架构函数
- * 取得DB类的实例对象
- * @param string $name 模型名称
- * @access public
- */
- public function __construct($name='') {
- // 模型初始化
- $this->_initialize();
- // 获取模型名称
- if(!empty($name)) {
- $this->name = $name;
- }elseif(empty($this->name)){
- $this->name = $this->getModelName();
- }
- // 数据库初始化操作
- // 获取数据库操作对象
- // 当前模型有独立的数据库连接信息
- $this->db(0,empty($this->connection)?$connection:$this->connection);
- // 设置表前缀
- $this->tablePrefix = $this->tablePrefix?$this->tablePrefix:C('DB_PREFIX');
- }
- // 回调方法 初始化模型
- protected function _initialize() {}
- /**
- * SQL查询
- * @access public
- * @param mixed $sql SQL指令
- * @return array
- */
- public function query($sql) {
- if(is_array($sql)) {
- return $this->patchQuery($sql);
- }
- if(!empty($sql)) {
- if(strpos($sql,'__TABLE__')) {
- $sql = str_replace('__TABLE__',$this->getTableName(),$sql);
- }
- return $this->db->query($sql);
- }else{
- return false;
- }
- }
- /**
- * 执行SQL语句
- * @access public
- * @param string $sql SQL指令
- * @return false | integer
- */
- public function execute($sql='') {
- if(!empty($sql)) {
- if(strpos($sql,'__TABLE__')) {
- $sql = str_replace('__TABLE__',$this->getTableName(),$sql);
- }
- $result = $this->db->execute($sql);
- return $result;
- }else {
- return false;
- }
- }
- /**
- * 得到当前的数据对象名称
- * @access public
- * @return string
- */
- public function getModelName() {
- if(empty($this->name)) {
- $this->name = substr(get_class($this),0,-5);
- }
- return $this->name;
- }
- /**
- * 得到完整的数据表名
- * @access public
- * @return string
- */
- public function getTableName() {
- if(empty($this->trueTableName)) {
- $tableName = !empty($this->tablePrefix) ? $this->tablePrefix : '';
- if(!empty($this->tableName)) {
- $tableName .= $this->tableName;
- }else{
- $tableName .= parse_name($this->name);
- }
- $this->trueTableName = strtolower($tableName);
- }
- return (!empty($this->dbName)?$this->dbName.'.':'').$this->trueTableName;
- }
- /**
- * 启动事务
- * @access public
- * @return void
- */
- public function startTrans() {
- $this->commit();
- $this->db->startTrans();
- return ;
- }
- /**
- * 提交事务
- * @access public
- * @return boolean
- */
- public function commit() {
- return $this->db->commit();
- }
- /**
- * 事务回滚
- * @access public
- * @return boolean
- */
- public function rollback() {
- return $this->db->rollback();
- }
- /**
- * 切换当前的数据库连接
- * @access public
- * @param integer $linkNum 连接序号
- * @param mixed $config 数据库连接信息
- * @return Model
- */
- public function db($linkNum='',$config=''){
- if(''===$linkNum && $this->db) {
- return $this->db;
- }
- static $_linkNum = array();
- static $_db = array();
- if(!isset($_db[$linkNum]) || (isset($_db[$linkNum]) && $_linkNum[$linkNum]!=$config) ) {
- // 创建一个新的实例
- if(!empty($config) && is_string($config) && false === strpos($config,'/')) { // 支持读取配置参数
- $config = C($config);
- }
- $_db[$linkNum] = Db::getInstance($config);
- }elseif(NULL === $config){
- $_db[$linkNum]->close(); // 关闭数据库连接
- unset($_db[$linkNum]);
- return ;
- }
- // 记录连接信息
- $_linkNum[$linkNum] = $config;
- // 切换数据库连接
- $this->db = $_db[$linkNum];
- return $this;
- }
- }
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