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879 lines
31 KiB
PHP
879 lines
31 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | TOPThink [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2011 http://topthink.com All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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// $Id$
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namespace Think;
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/**
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* ThinkPHP 数据库中间层实现类
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* @category Think
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* @package Think
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* @subpackage Core
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* @author liu21st <liu21st@gmail.com>
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*/
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class Db {
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// 数据库类型
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protected $dbType = null;
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// 是否自动释放查询结果
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protected $autoFree = false;
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// 当前操作所属的模型名
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protected $model = '_think_';
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// 是否使用永久连接
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protected $pconnect = false;
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// 当前SQL指令
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protected $queryStr = '';
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protected $modelSql = [];
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// 最后插入ID
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protected $lastInsID = null;
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// 返回或者影响记录数
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protected $numRows = 0;
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// 返回字段数
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protected $numCols = 0;
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// 事务指令数
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protected $transTimes = 0;
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// 错误信息
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protected $error = '';
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// 数据库连接ID 支持多个连接
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protected $linkID = [];
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// 当前连接ID
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protected $_linkID = null;
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// 当前查询ID
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protected $queryID = null;
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// 是否已经连接数据库
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protected $connected = false;
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// 数据库连接参数配置
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protected $config = '';
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// 数据库表达式
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protected $comparison = ['eq'=>'=','neq'=>'<>','gt'=>'>','egt'=>'>=','lt'=>'<','elt'=>'<=','notlike'=>'NOT LIKE','like'=>'LIKE','in'=>'IN','notin'=>'NOT IN'];
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// 查询表达式
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protected $selectSql = 'SELECT%DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%%LIMIT% %UNION%%COMMENT%';
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protected $conf = [];
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/**
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* 取得数据库类实例
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* @static
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* @access public
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* @return mixed 返回数据库驱动类
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*/
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public static function getInstance($config) {
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static $_instance = [];
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$md5 = md5(serialize($config));
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if(!isset($_instance[$md5])) {
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$Db = new Db();
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$_instance[$md5] = $Db->factory($config);
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}
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return $_instance[$md5];
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}
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/**
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* 加载数据库 支持配置文件或者 DSN
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* @access public
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* @param mixed $db_config 数据库配置信息
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* @return string
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*/
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public function factory($db_config='') {
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$this->conf = Config::get();
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// 读取数据库配置
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$db_config = $this->parseConfig($db_config);
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if(empty($db_config['dbms']))
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throw_exception(Lang::get('_NO_DB_CONFIG_'));
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// 数据库类型
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$db_type = strtolower($db_config['dbms']);
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$class = '\Think\Db\Driver\\'. ucwords($db_type);
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// 检查驱动类
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if(class_exists($class)) {
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$db = new $class($db_config);
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// 获取当前的数据库类型
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if( 'pdo' != $db_type )
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$db->dbType = strtoupper($db_type);
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else
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$db->dbType = $this->_getDsnType($db_config['dsn']);
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}else {
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// 类没有定义
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throw_exception(Lang::get('_NO_DB_DRIVER_').': ' . $class);
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}
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return $db;
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}
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/**
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* 根据DSN获取数据库类型 返回大写
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* @access protected
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* @param string $dsn dsn字符串
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* @return string
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*/
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protected function _getDsnType($dsn) {
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$match = explode(':',$dsn);
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$dbType = strtoupper(trim($match[0]));
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return $dbType;
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}
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/**
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* 分析数据库配置信息，支持数组和DSN
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* @access private
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* @param mixed $db_config 数据库配置信息
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* @return string
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*/
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private function parseConfig($db_config='') {
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if ( !empty($db_config) && is_string($db_config)) {
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// 如果DSN字符串则进行解析
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$db_config = $this->parseDSN($db_config);
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}elseif(is_array($db_config)) { // 数组配置
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$db_config = array_change_key_case($db_config);
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$db_config = [
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'dbms' => $db_config['db_type'],
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'username' => $db_config['db_user'],
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'password' => $db_config['db_pwd'],
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'hostname' => $db_config['db_host'],
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'hostport' => $db_config['db_port'],
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'database' => $db_config['db_name'],
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'dsn' => $db_config['db_dsn'],
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'params' => $db_config['db_params'],
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];
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}elseif(empty($db_config)) {
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// 如果配置为空，读取配置文件设置
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if( isset($this->conf['db_dsn']) && $this->conf['db_dsn'] && 'pdo' != strtolower($this->conf['db_type']) ) { // 如果设置了DB_DSN 则优先
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$db_config = $this->parseDSN($this->conf['db_dsn']);
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}else{
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$db_config = array (
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'dbms' => $this->conf['db_type'],
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'username' => $this->conf['db_user'],
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'password' => $this->conf['db_pwd'],
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'hostname' => $this->conf['db_host'],
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'hostport' => $this->conf['db_port'],
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'database' => $this->conf['db_name'],
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'dsn' => isset($this->conf['db_dsn'])?$this->conf['db_dsn']:'',
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'params' => isset($this->conf['db_params'])?$this->conf['db_params']:'',
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);
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}
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}
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return $db_config;
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}
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/**
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* 初始化数据库连接
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* @access protected
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* @param boolean $master 主服务器
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* @return void
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*/
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protected function initConnect($master=true) {
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if(empty($this->conf)) {
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$this->conf = Config::get();
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}
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if(1 == $this->conf['db_deploy_type'])
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// 采用分布式数据库
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$this->_linkID = $this->multiConnect($master);
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else
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// 默认单数据库
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if ( !$this->connected ) $this->_linkID = $this->connect();
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}
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/**
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* 连接分布式服务器
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* @access protected
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* @param boolean $master 主服务器
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* @return void
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*/
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protected function multiConnect($master=false) {
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static $_config = [];
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if(empty($_config)) {
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// 缓存分布式数据库配置解析
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foreach ($this->config as $key=>$val){
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$_config[$key] = explode(',',$val);
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}
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}
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// 数据库读写是否分离
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if($this->conf['db_rw_separate']){
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// 主从式采用读写分离
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if($master)
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// 主服务器写入
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$r = floor(mt_rand(0,$this->conf['db_master_num']-1));
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else{
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if(is_numeric($this->conf['db_slave_no'])) {// 指定服务器读
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$r = $this->conf['db_slave_no'];
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}else{
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// 读操作连接从服务器
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$r = floor(mt_rand($this->conf['db_master_num'],count($_config['hostname'])-1)); // 每次随机连接的数据库
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}
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}
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}else{
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// 读写操作不区分服务器
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$r = floor(mt_rand(0,count($_config['hostname'])-1)); // 每次随机连接的数据库
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}
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$db_config = [
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'username' => isset($_config['username'][$r])?$_config['username'][$r]:$_config['username'][0],
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'password' => isset($_config['password'][$r])?$_config['password'][$r]:$_config['password'][0],
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'hostname' => isset($_config['hostname'][$r])?$_config['hostname'][$r]:$_config['hostname'][0],
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'hostport' => isset($_config['hostport'][$r])?$_config['hostport'][$r]:$_config['hostport'][0],
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'database' => isset($_config['database'][$r])?$_config['database'][$r]:$_config['database'][0],
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'dsn' => isset($_config['dsn'][$r])?$_config['dsn'][$r]:$_config['dsn'][0],
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'params' => isset($_config['params'][$r])?$_config['params'][$r]:$_config['params'][0],
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];
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return $this->connect($db_config,$r);
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}
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/**
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* DSN解析
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* 格式： mysql://username:passwd@localhost:3306/DbName
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* @static
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* @access public
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* @param string $dsnStr
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* @return array
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*/
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public function parseDSN($dsnStr) {
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if( empty($dsnStr) ){return false;}
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$info = parse_url($dsnStr);
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if($info['scheme']){
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$dsn = [
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'dbms' => $info['scheme'],
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'username' => isset($info['user']) ? $info['user'] : '',
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'password' => isset($info['pass']) ? $info['pass'] : '',
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'hostname' => isset($info['host']) ? $info['host'] : '',
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'hostport' => isset($info['port']) ? $info['port'] : '',
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'database' => isset($info['path']) ? substr($info['path'],1) : ''
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];
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}else {
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preg_match('/^(.*?)\:\/\/(.*?)\:(.*?)\@(.*?)\:([0-9]{1, 6})\/(.*?)$/',trim($dsnStr),$matches);
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$dsn = [
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'dbms' => $matches[1],
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'username' => $matches[2],
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'password' => $matches[3],
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'hostname' => $matches[4],
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'hostport' => $matches[5],
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'database' => $matches[6]
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];
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}
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$dsn['dsn'] = ''; // 兼容配置信息数组
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return $dsn;
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}
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/**
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* 数据库调试 记录当前SQL
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* @access protected
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*/
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protected function debug() {
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$this->modelSql[$this->model] = $this->queryStr;
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$this->model = '_think_';
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// 记录操作结束时间
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Debug::remark('queryEndTime','time');
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Log::record($this->queryStr.' [ RunTime:'.Debug::getUseTime('queryStartTime','queryEndTime').'s ]','SQL');
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}
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/**
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* 设置锁机制
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* @access protected
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* @return string
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*/
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protected function parseLock($lock=false) {
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if(!$lock) return '';
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if('ORACLE' == $this->dbType) {
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return ' FOR UPDATE NOWAIT ';
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}
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return ' FOR UPDATE ';
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}
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/**
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* set分析
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* @access protected
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* @param array $data
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* @return string
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*/
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protected function parseSet($data) {
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foreach ($data as $key=>$val){
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$value = $this->parseValue($val);
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if(is_scalar($value)) // 过滤非标量数据
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$set[] = $this->parseKey($key).'='.$value;
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}
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return ' SET '.implode(',',$set);
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}
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/**
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* 字段名分析
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* @access protected
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* @param string $key
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* @return string
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*/
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protected function parseKey(&$key) {
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return $key;
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}
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/**
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* value分析
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* @access protected
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* @param mixed $value
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* @return string
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*/
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protected function parseValue($value) {
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if(is_string($value)) {
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$value = '\''.$this->escapeString($value).'\'';
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}elseif(isset($value[0]) && is_string($value[0]) && strtolower($value[0]) == 'exp'){
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$value = $this->escapeString($value[1]);
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}elseif(is_array($value)) {
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$value = array_map(array($this, 'parseValue'),$value);
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}elseif(is_bool($value)){
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$value = $value ? '1' : '0';
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}elseif(is_null($value)){
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$value = 'null';
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}
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return $value;
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}
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/**
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* field分析
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* @access protected
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* @param mixed $fields
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* @return string
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*/
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protected function parseField($fields) {
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if(is_string($fields) && strpos($fields,',')) {
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$fields = explode(',',$fields);
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}
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if(is_array($fields)) {
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// 完善数组方式传字段名的支持
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// 支持 'field1'=>'field2' 这样的字段别名定义
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$array = [];
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foreach ($fields as $key=>$field){
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if(!is_numeric($key))
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$array[] = $this->parseKey($key).' AS '.$this->parseKey($field);
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else
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$array[] = $this->parseKey($field);
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}
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$fieldsStr = implode(',', $array);
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}elseif(is_string($fields) && !empty($fields)) {
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$fieldsStr = $this->parseKey($fields);
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}else{
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$fieldsStr = '*';
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}
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//TODO 如果是查询全部字段，并且是join的方式，那么就把要查的表加个别名，以免字段被覆盖
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return $fieldsStr;
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}
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/**
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* table分析
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* @access protected
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* @param mixed $table
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* @return string
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*/
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protected function parseTable($tables) {
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if(is_array($tables)) {// 支持别名定义
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$array = [];
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foreach ($tables as $table=>$alias){
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if(!is_numeric($table))
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$array[] = $this->parseKey($table).' '.$this->parseKey($alias);
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else
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$array[] = $this->parseKey($table);
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}
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$tables = $array;
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}elseif(is_string($tables)){
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$tables = explode(',',$tables);
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array_walk($tables, array(&$this, 'parseKey'));
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}
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return implode(',',$tables);
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}
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/**
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* where分析
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* @access protected
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* @param mixed $where
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* @return string
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*/
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protected function parseWhere($where) {
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$whereStr = '';
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if(is_string($where)) {
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// 直接使用字符串条件
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$whereStr = $where;
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}else{ // 使用数组表达式
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$operate = isset($where['_logic'])?strtoupper($where['_logic']):'';
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if(in_array($operate,['AND','OR','XOR'])){
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// 定义逻辑运算规则 例如 OR XOR AND NOT
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$operate = ' '.$operate.' ';
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unset($where['_logic']);
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}else{
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// 默认进行 AND 运算
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$operate = ' AND ';
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}
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foreach ($where as $key=>$val){
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$whereStr .= '( ';
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if(0===strpos($key,'_')) {
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// 解析特殊条件表达式
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$whereStr .= $this->parseThinkWhere($key,$val);
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}else{
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// 查询字段的安全过滤
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if(!preg_match('/^[A-Z_\|\&\-.a-z0-9\(\)\,]+$/',trim($key))){
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throw_exception(L('_EXPRESS_ERROR_').':'.$key);
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}
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// 多条件支持
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$multi = is_array($val) && isset($val['_multi']);
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$key = trim($key);
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if(strpos($key,'|')) { // 支持 name|title|nickname 方式定义查询字段
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$array = explode('|',$key);
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$str = [];
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foreach ($array as $m=>$k){
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$v = $multi?$val[$m]:$val;
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$str[] = '('.$this->parseWhereItem($this->parseKey($k),$v).')';
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}
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$whereStr .= implode(' OR ',$str);
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}elseif(strpos($key,'&')){
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$array = explode('&',$key);
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$str = [];
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foreach ($array as $m=>$k){
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$v = $multi?$val[$m]:$val;
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$str[] = '('.$this->parseWhereItem($this->parseKey($k),$v).')';
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}
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$whereStr .= implode(' AND ',$str);
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}else{
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$whereStr .= $this->parseWhereItem($this->parseKey($key),$val);
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}
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}
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$whereStr .= ' )'.$operate;
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}
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$whereStr = substr($whereStr,0,-strlen($operate));
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}
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return empty($whereStr)?'':' WHERE '.$whereStr;
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}
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// where子单元分析
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protected function parseWhereItem($key,$val) {
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$whereStr = '';
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if(is_array($val)) {
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if(is_string($val[0])) {
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if(preg_match('/^(EQ|NEQ|GT|EGT|LT|ELT)$/i',$val[0])) { // 比较运算
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$whereStr .= $key.' '.$this->comparison[strtolower($val[0])].' '.$this->parseValue($val[1]);
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}elseif(preg_match('/^(NOTLIKE|LIKE)$/i',$val[0])){// 模糊查找
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if(is_array($val[1])) {
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$likeLogic = isset($val[2])?strtoupper($val[2]):'OR';
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if(in_array($likeLogic,['AND','OR','XOR'])){
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$likeStr = $this->comparison[strtolower($val[0])];
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$like = [];
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foreach ($val[1] as $item){
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$like[] = $key.' '.$likeStr.' '.$this->parseValue($item);
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}
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$whereStr .= '('.implode(' '.$likeLogic.' ',$like).')';
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}
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}else{
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$whereStr .= $key.' '.$this->comparison[strtolower($val[0])].' '.$this->parseValue($val[1]);
|
||
}
|
||
}elseif('exp'==strtolower($val[0])){ // 使用表达式
|
||
$whereStr .= ' ('.$key.' '.$val[1].') ';
|
||
}elseif(preg_match('/IN/i',$val[0])){ // IN 运算
|
||
if(isset($val[2]) && 'exp'==$val[2]) {
|
||
$whereStr .= $key.' '.strtoupper($val[0]).' '.$val[1];
|
||
}else{
|
||
if(is_string($val[1])) {
|
||
$val[1] = explode(',',$val[1]);
|
||
}
|
||
$zone = implode(',',$this->parseValue($val[1]));
|
||
$whereStr .= $key.' '.strtoupper($val[0]).' ('.$zone.')';
|
||
}
|
||
}elseif(preg_match('/BETWEEN/i',$val[0])){ // BETWEEN运算
|
||
$data = is_string($val[1])? explode(',',$val[1]):$val[1];
|
||
$whereStr .= ' ('.$key.' '.strtoupper($val[0]).' '.$this->parseValue($data[0]).' AND '.$this->parseValue($data[1]).' )';
|
||
}else{
|
||
throw_exception(L('_EXPRESS_ERROR_').':'.$val[0]);
|
||
}
|
||
}else {
|
||
$count = count($val);
|
||
$rule = isset($val[$count-1])?strtoupper($val[$count-1]):'';
|
||
if(in_array($rule,['AND','OR','XOR'])) {
|
||
$count = $count -1;
|
||
}else{
|
||
$rule = 'AND';
|
||
}
|
||
for($i=0;$i<$count;$i++) {
|
||
$data = is_array($val[$i])?$val[$i][1]:$val[$i];
|
||
if('exp'==strtolower($val[$i][0])) {
|
||
$whereStr .= '('.$key.' '.$data.') '.$rule.' ';
|
||
}else{
|
||
$op = is_array($val[$i])?$this->comparison[strtolower($val[$i][0])]:'=';
|
||
$whereStr .= '('.$key.' '.$op.' '.$this->parseValue($data).') '.$rule.' ';
|
||
}
|
||
}
|
||
$whereStr = substr($whereStr,0,-4);
|
||
}
|
||
}else {
|
||
//对字符串类型字段采用模糊匹配
|
||
if($this->conf['db_like_fields'] && preg_match('/('.$this->conf['db_like_fields'].')/i',$key)) {
|
||
$val = '%'.$val.'%';
|
||
$whereStr .= $key.' LIKE '.$this->parseValue($val);
|
||
}else {
|
||
$whereStr .= $key.' = '.$this->parseValue($val);
|
||
}
|
||
}
|
||
return $whereStr;
|
||
}
|
||
|
||
/**
|
||
* 特殊条件分析
|
||
* @access protected
|
||
* @param string $key
|
||
* @param mixed $val
|
||
* @return string
|
||
*/
|
||
protected function parseThinkWhere($key,$val) {
|
||
$whereStr = '';
|
||
switch($key) {
|
||
case '_string':
|
||
// 字符串模式查询条件
|
||
$whereStr = $val;
|
||
break;
|
||
case '_complex':
|
||
// 复合查询条件
|
||
$whereStr = substr($this->parseWhere($val),6);
|
||
break;
|
||
case '_query':
|
||
// 字符串模式查询条件
|
||
parse_str($val,$where);
|
||
if(isset($where['_logic'])) {
|
||
$op = ' '.strtoupper($where['_logic']).' ';
|
||
unset($where['_logic']);
|
||
}else{
|
||
$op = ' AND ';
|
||
}
|
||
$array = [];
|
||
foreach ($where as $field=>$data)
|
||
$array[] = $this->parseKey($field).' = '.$this->parseValue($data);
|
||
$whereStr = implode($op,$array);
|
||
break;
|
||
}
|
||
return $whereStr;
|
||
}
|
||
|
||
/**
|
||
* limit分析
|
||
* @access protected
|
||
* @param mixed $lmit
|
||
* @return string
|
||
*/
|
||
protected function parseLimit($limit) {
|
||
return !empty($limit)? ' LIMIT '.$limit.' ':'';
|
||
}
|
||
|
||
/**
|
||
* join分析
|
||
* @access protected
|
||
* @param mixed $join
|
||
* @return string
|
||
*/
|
||
protected function parseJoin($join) {
|
||
$joinStr = '';
|
||
if(!empty($join)) {
|
||
if(is_array($join)) {
|
||
foreach ($join as $key=>$_join){
|
||
if(false !== stripos($_join,'JOIN'))
|
||
$joinStr .= ' '.$_join;
|
||
else
|
||
$joinStr .= ' LEFT JOIN ' .$_join;
|
||
}
|
||
}else{
|
||
$joinStr .= ' LEFT JOIN ' .$join;
|
||
}
|
||
}
|
||
//将__TABLE_NAME__这样的字符串替换成正规的表名,并且带上前缀和后缀
|
||
$joinStr = preg_replace("/__([A-Z_-]+)__/esU",Config::get('db_prefix').".strtolower('$1')",$joinStr);
|
||
return $joinStr;
|
||
}
|
||
|
||
/**
|
||
* order分析
|
||
* @access protected
|
||
* @param mixed $order
|
||
* @return string
|
||
*/
|
||
protected function parseOrder($order) {
|
||
if(is_array($order)) {
|
||
$array = [];
|
||
foreach ($order as $key=>$val){
|
||
if(is_numeric($key)) {
|
||
$array[] = $this->parseKey($val);
|
||
}else{
|
||
$array[] = $this->parseKey($key).' '.$val;
|
||
}
|
||
}
|
||
$order = implode(',',$array);
|
||
}
|
||
return !empty($order)? ' ORDER BY '.$order:'';
|
||
}
|
||
|
||
/**
|
||
* group分析
|
||
* @access protected
|
||
* @param mixed $group
|
||
* @return string
|
||
*/
|
||
protected function parseGroup($group) {
|
||
return !empty($group)? ' GROUP BY '.$group:'';
|
||
}
|
||
|
||
/**
|
||
* having分析
|
||
* @access protected
|
||
* @param string $having
|
||
* @return string
|
||
*/
|
||
protected function parseHaving($having) {
|
||
return !empty($having)? ' HAVING '.$having:'';
|
||
}
|
||
|
||
/**
|
||
* comment分析
|
||
* @access protected
|
||
* @param string $comment
|
||
* @return string
|
||
*/
|
||
protected function parseComment($comment) {
|
||
return !empty($comment)? ' /* '.$comment.' */':'';
|
||
}
|
||
|
||
/**
|
||
* distinct分析
|
||
* @access protected
|
||
* @param mixed $distinct
|
||
* @return string
|
||
*/
|
||
protected function parseDistinct($distinct) {
|
||
return !empty($distinct)? ' DISTINCT ' :'';
|
||
}
|
||
|
||
/**
|
||
* union分析
|
||
* @access protected
|
||
* @param mixed $union
|
||
* @return string
|
||
*/
|
||
protected function parseUnion($union) {
|
||
if(empty($union)) return '';
|
||
if(isset($union['_all'])) {
|
||
$str = 'UNION ALL ';
|
||
unset($union['_all']);
|
||
}else{
|
||
$str = 'UNION ';
|
||
}
|
||
foreach ($union as $u){
|
||
$sql[] = $str.(is_array($u)?$this->buildSelectSql($u):$u);
|
||
}
|
||
return implode(' ',$sql);
|
||
}
|
||
|
||
/**
|
||
* 插入记录
|
||
* @access public
|
||
* @param mixed $data 数据
|
||
* @param array $options 参数表达式
|
||
* @param boolean $replace 是否replace
|
||
* @return false | integer
|
||
*/
|
||
public function insert($data,$options=[],$replace=false) {
|
||
$values = $fields = [];
|
||
$this->model = $options['model'];
|
||
foreach ($data as $key=>$val){
|
||
$value = $this->parseValue($val);
|
||
if(is_scalar($value)) { // 过滤非标量数据
|
||
$values[] = $value;
|
||
$fields[] = $this->parseKey($key);
|
||
}
|
||
}
|
||
$sql = ($replace?'REPLACE':'INSERT').' INTO '.$this->parseTable($options['table']).' ('.implode(',', $fields).') VALUES ('.implode(',', $values).')';
|
||
$sql .= $this->parseLock(isset($options['lock'])?$options['lock']:false);
|
||
$sql .= $this->parseComment(!empty($options['comment'])?$options['comment']:'');
|
||
return $this->execute($sql);
|
||
}
|
||
|
||
/**
|
||
* 通过Select方式插入记录
|
||
* @access public
|
||
* @param string $fields 要插入的数据表字段名
|
||
* @param string $table 要插入的数据表名
|
||
* @param array $option 查询数据参数
|
||
* @return false | integer
|
||
*/
|
||
public function selectInsert($fields,$table,$options=[]) {
|
||
$this->model = $options['model'];
|
||
if(is_string($fields)) $fields = explode(',',$fields);
|
||
array_walk($fields, [$this, 'parseKey']);
|
||
$sql = 'INSERT INTO '.$this->parseTable($table).' ('.implode(',', $fields).') ';
|
||
$sql .= $this->buildSelectSql($options);
|
||
return $this->execute($sql);
|
||
}
|
||
|
||
/**
|
||
* 更新记录
|
||
* @access public
|
||
* @param mixed $data 数据
|
||
* @param array $options 表达式
|
||
* @return false | integer
|
||
*/
|
||
public function update($data,$options) {
|
||
$this->model = $options['model'];
|
||
$sql = 'UPDATE '
|
||
.$this->parseTable($options['table'])
|
||
.$this->parseSet($data)
|
||
.$this->parseWhere(!empty($options['where'])?$options['where']:'')
|
||
.$this->parseOrder(!empty($options['order'])?$options['order']:'')
|
||
.$this->parseLimit(!empty($options['limit'])?$options['limit']:'')
|
||
.$this->parseLock(isset($options['lock'])?$options['lock']:false)
|
||
.$this->parseComment(!empty($options['comment'])?$options['comment']:'');
|
||
return $this->execute($sql);
|
||
}
|
||
|
||
/**
|
||
* 删除记录
|
||
* @access public
|
||
* @param array $options 表达式
|
||
* @return false | integer
|
||
*/
|
||
public function delete($options=[]) {
|
||
$this->model = $options['model'];
|
||
$sql = 'DELETE FROM '
|
||
.$this->parseTable($options['table'])
|
||
.$this->parseWhere(!empty($options['where'])?$options['where']:'')
|
||
.$this->parseOrder(!empty($options['order'])?$options['order']:'')
|
||
.$this->parseLimit(!empty($options['limit'])?$options['limit']:'')
|
||
.$this->parseLock(isset($options['lock'])?$options['lock']:false)
|
||
.$this->parseComment(!empty($options['comment'])?$options['comment']:'');
|
||
return $this->execute($sql);
|
||
}
|
||
|
||
/**
|
||
* 查找记录
|
||
* @access public
|
||
* @param array $options 表达式
|
||
* @return mixed
|
||
*/
|
||
public function select($options=[]) {
|
||
$this->model = $options['model'];
|
||
$sql = $this->buildSelectSql($options);
|
||
$cache = isset($options['cache'])?$options['cache']:false;
|
||
if($cache) { // 查询缓存检测
|
||
$key = is_string($cache['key'])?$cache['key']:md5($sql);
|
||
$value = S($key,'',$cache);
|
||
if(false !== $value) {
|
||
return $value;
|
||
}
|
||
}
|
||
$result = $this->query($sql);
|
||
if($cache && false !== $result ) { // 查询缓存写入
|
||
S($key,$result,$cache);
|
||
}
|
||
return $result;
|
||
}
|
||
|
||
/**
|
||
* 生成查询SQL
|
||
* @access public
|
||
* @param array $options 表达式
|
||
* @return string
|
||
*/
|
||
public function buildSelectSql($options=[]) {
|
||
if(isset($options['page'])) {
|
||
// 根据页数计算limit
|
||
if(strpos($options['page'],',')) {
|
||
list($page,$listRows) = explode(',',$options['page']);
|
||
}else{
|
||
$page = $options['page'];
|
||
}
|
||
$page = $page?$page:1;
|
||
$listRows= isset($listRows)?$listRows:(is_numeric($options['limit'])?$options['limit']:20);
|
||
$offset = $listRows*((int)$page-1);
|
||
$options['limit'] = $offset.','.$listRows;
|
||
}
|
||
$sql = $this->parseSql($this->selectSql,$options);
|
||
$sql .= $this->parseLock(isset($options['lock'])?$options['lock']:false);
|
||
return $sql;
|
||
}
|
||
|
||
/**
|
||
* 替换SQL语句中表达式
|
||
* @access public
|
||
* @param array $options 表达式
|
||
* @return string
|
||
*/
|
||
public function parseSql($sql,$options=[]){
|
||
$sql = str_replace(
|
||
['%TABLE%','%DISTINCT%','%FIELD%','%JOIN%','%WHERE%','%GROUP%','%HAVING%','%ORDER%','%LIMIT%','%UNION%','%COMMENT%'],
|
||
[
|
||
$this->parseTable($options['table']),
|
||
$this->parseDistinct(isset($options['distinct'])?$options['distinct']:false),
|
||
$this->parseField(!empty($options['field'])?$options['field']:'*'),
|
||
$this->parseJoin(!empty($options['join'])?$options['join']:''),
|
||
$this->parseWhere(!empty($options['where'])?$options['where']:''),
|
||
$this->parseGroup(!empty($options['group'])?$options['group']:''),
|
||
$this->parseHaving(!empty($options['having'])?$options['having']:''),
|
||
$this->parseOrder(!empty($options['order'])?$options['order']:''),
|
||
$this->parseLimit(!empty($options['limit'])?$options['limit']:''),
|
||
$this->parseUnion(!empty($options['union'])?$options['union']:''),
|
||
$this->parseComment(!empty($options['comment'])?$options['comment']:'')
|
||
],$sql);
|
||
return $sql;
|
||
}
|
||
|
||
/**
|
||
* 获取最近一次查询的sql语句
|
||
* @param string $model 模型名
|
||
* @access public
|
||
* @return string
|
||
*/
|
||
public function getLastSql($model='') {
|
||
return $model?$this->modelSql[$model]:$this->queryStr;
|
||
}
|
||
|
||
/**
|
||
* 获取最近插入的ID
|
||
* @access public
|
||
* @return string
|
||
*/
|
||
public function getLastInsID() {
|
||
return $this->lastInsID;
|
||
}
|
||
|
||
/**
|
||
* 获取最近的错误信息
|
||
* @access public
|
||
* @return string
|
||
*/
|
||
public function getError() {
|
||
return $this->error;
|
||
}
|
||
|
||
/**
|
||
* SQL指令安全过滤
|
||
* @access public
|
||
* @param string $str SQL字符串
|
||
* @return string
|
||
*/
|
||
public function escapeString($str) {
|
||
return addslashes($str);
|
||
}
|
||
|
||
/**
|
||
* 设置当前操作模型
|
||
* @access public
|
||
* @param string $model 模型名
|
||
* @return void
|
||
*/
|
||
public function setModel($model){
|
||
$this->model = $model;
|
||
}
|
||
|
||
/**
|
||
* 析构方法
|
||
* @access public
|
||
*/
|
||
public function __destruct() {
|
||
// 释放查询
|
||
if ($this->queryID){
|
||
$this->free();
|
||
}
|
||
// 关闭连接
|
||
$this->close();
|
||
}
|
||
|
||
// 关闭数据库 由驱动类定义
|
||
public function close(){}
|
||
} |