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466 lines
15 KiB
PHTML
466 lines
15 KiB
PHTML
5 years ago
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<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006-2014 http://thinkphp.cn 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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namespace Think\Db;
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use Think\Config;
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use Think\Debug;
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use Think\Log;
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use PDO;
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class Lite {
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// PDO操作实例
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protected $PDOStatement = null;
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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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// 当前SQL指令
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protected $queryStr = '';
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protected $modelSql = array();
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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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// 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 = array();
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// 当前连接ID
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protected $_linkID = null;
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// 数据库连接参数配置
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protected $config = array(
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'type' => '', // 数据库类型
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'hostname' => '127.0.0.1', // 服务器地址
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'database' => '', // 数据库名
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'username' => '', // 用户名
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'password' => '', // 密码
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'hostport' => '', // 端口
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'dsn' => '', //
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'params' => array(), // 数据库连接参数
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'charset' => 'utf8', // 数据库编码默认采用utf8
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'prefix' => '', // 数据库表前缀
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'debug' => false, // 数据库调试模式
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'deploy' => 0, // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
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'rw_separate' => false, // 数据库读写是否分离 主从式有效
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'master_num' => 1, // 读写分离后 主服务器数量
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'slave_no' => '', // 指定从服务器序号
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);
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// 数据库表达式
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protected $comparison = array('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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// 查询次数
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protected $queryTimes = 0;
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// 执行次数
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protected $executeTimes = 0;
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// PDO连接参数
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protected $options = array(
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PDO::ATTR_CASE => PDO::CASE_LOWER,
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
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PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL,
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PDO::ATTR_STRINGIFY_FETCHES => false,
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);
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/**
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* 架构函数 读取数据库配置信息
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* @access public
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* @param array $config 数据库配置数组
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*/
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public function __construct($config=''){
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if(!empty($config)) {
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$this->config = array_merge($this->config,$config);
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if(is_array($this->config['params'])){
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$this->options += $this->config['params'];
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}
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}
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}
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/**
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* 连接数据库方法
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* @access public
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*/
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public function connect($config='',$linkNum=0) {
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if ( !isset($this->linkID[$linkNum]) ) {
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if(empty($config)) $config = $this->config;
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try{
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if(empty($config['dsn'])) {
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$config['dsn'] = $this->parseDsn($config);
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}
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if(version_compare(PHP_VERSION,'5.3.6','<=')){ //禁用模拟预处理语句
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$this->options[PDO::ATTR_EMULATE_PREPARES] = false;
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}
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$this->linkID[$linkNum] = new PDO( $config['dsn'], $config['username'], $config['password'],$this->options);
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}catch (\PDOException $e) {
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E($e->getMessage());
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}
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}
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return $this->linkID[$linkNum];
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}
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/**
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* 解析pdo连接的dsn信息
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* @access public
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* @param array $config 连接信息
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* @return string
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*/
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protected function parseDsn($config){}
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/**
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* 释放查询结果
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* @access public
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*/
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public function free() {
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$this->PDOStatement = null;
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}
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/**
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* 执行查询 返回数据集
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* @access public
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* @param string $str sql指令
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* @param array $bind 参数绑定
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* @return mixed
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*/
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public function query($str,$bind=array()) {
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$this->initConnect(false);
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if ( !$this->_linkID ) return false;
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$this->queryStr = $str;
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if(!empty($bind)){
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$that = $this;
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$this->queryStr = strtr($this->queryStr,array_map(function($val) use($that){ return '\''.$that->escapeString($val).'\''; },$bind));
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}
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//释放前次的查询结果
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if ( !empty($this->PDOStatement) ) $this->free();
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$this->queryTimes++;
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N('db_query',1); // 兼容代码
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// 调试开始
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$this->debug(true);
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$this->PDOStatement = $this->_linkID->prepare($str);
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if(false === $this->PDOStatement)
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E($this->error());
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foreach ($bind as $key => $val) {
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if(is_array($val)){
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$this->PDOStatement->bindValue($key, $val[0], $val[1]);
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}else{
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$this->PDOStatement->bindValue($key, $val);
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}
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}
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$result = $this->PDOStatement->execute();
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// 调试结束
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$this->debug(false);
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if ( false === $result ) {
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$this->error();
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return false;
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} else {
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return $this->getResult();
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}
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}
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/**
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* 执行语句
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* @access public
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* @param string $str sql指令
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* @param array $bind 参数绑定
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* @return integer
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*/
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public function execute($str,$bind=array()) {
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$this->initConnect(true);
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if ( !$this->_linkID ) return false;
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$this->queryStr = $str;
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if(!empty($bind)){
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$that = $this;
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$this->queryStr = strtr($this->queryStr,array_map(function($val) use($that){ return '\''.$that->escapeString($val).'\''; },$bind));
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}
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//释放前次的查询结果
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if ( !empty($this->PDOStatement) ) $this->free();
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$this->executeTimes++;
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N('db_write',1); // 兼容代码
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// 记录开始执行时间
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$this->debug(true);
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$this->PDOStatement = $this->_linkID->prepare($str);
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if(false === $this->PDOStatement) {
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E($this->error());
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}
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foreach ($bind as $key => $val) {
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if(is_array($val)){
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$this->PDOStatement->bindValue($key, $val[0], $val[1]);
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}else{
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$this->PDOStatement->bindValue($key, $val);
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}
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}
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$result = $this->PDOStatement->execute();
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$this->debug(false);
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if ( false === $result) {
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$this->error();
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return false;
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} else {
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$this->numRows = $this->PDOStatement->rowCount();
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if(preg_match("/^\s*(INSERT\s+INTO|REPLACE\s+INTO)\s+/i", $str)) {
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$this->lastInsID = $this->_linkID->lastInsertId();
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}
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return $this->numRows;
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}
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}
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/**
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* 启动事务
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* @access public
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* @return void
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*/
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public function startTrans() {
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$this->initConnect(true);
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if ( !$this->_linkID ) return false;
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//数据rollback 支持
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if ($this->transTimes == 0) {
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$this->_linkID->beginTransaction();
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}
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$this->transTimes++;
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return ;
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}
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/**
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* 用于非自动提交状态下面的查询提交
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* @access public
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* @return boolean
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*/
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public function commit() {
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if ($this->transTimes > 0) {
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$result = $this->_linkID->commit();
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$this->transTimes = 0;
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if(!$result){
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$this->error();
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return false;
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}
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}
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return true;
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}
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/**
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* 事务回滚
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* @access public
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* @return boolean
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*/
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public function rollback() {
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if ($this->transTimes > 0) {
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$result = $this->_linkID->rollback();
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$this->transTimes = 0;
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if(!$result){
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$this->error();
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return false;
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}
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}
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return true;
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}
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/**
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* 获得所有的查询数据
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* @access private
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* @return array
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*/
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private function getResult() {
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//返回数据集
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$result = $this->PDOStatement->fetchAll(PDO::FETCH_ASSOC);
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$this->numRows = count( $result );
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return $result;
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}
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/**
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* 获得查询次数
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* @access public
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* @param boolean $execute 是否包含所有查询
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* @return integer
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*/
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public function getQueryTimes($execute=false){
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return $execute?$this->queryTimes+$this->executeTimes:$this->queryTimes;
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}
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/**
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* 获得执行次数
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* @access public
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* @return integer
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*/
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public function getExecuteTimes(){
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return $this->executeTimes;
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}
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/**
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* 关闭数据库
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* @access public
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*/
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public function close() {
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$this->_linkID = null;
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}
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/**
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* 数据库错误信息
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* 并显示当前的SQL语句
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* @access public
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* @return string
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*/
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public function error() {
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if($this->PDOStatement) {
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$error = $this->PDOStatement->errorInfo();
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$this->error = $error[1].':'.$error[2];
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}else{
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$this->error = '';
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}
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if('' != $this->queryStr){
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$this->error .= "\n [ SQL语句 ] : ".$this->queryStr;
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}
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// 记录错误日志
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trace($this->error,'','ERR');
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if($this->config['debug']) {// 开启数据库调试模式
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E($this->error);
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}else{
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return $this->error;
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}
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}
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/**
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* 获取最近一次查询的sql语句
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* @param string $model 模型名
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* @access public
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* @return string
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*/
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public function getLastSql($model='') {
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return $model?$this->modelSql[$model]:$this->queryStr;
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}
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/**
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* 获取最近插入的ID
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* @access public
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* @return string
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*/
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public function getLastInsID() {
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return $this->lastInsID;
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}
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/**
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* 获取最近的错误信息
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* @access public
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* @return string
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*/
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public function getError() {
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return $this->error;
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}
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/**
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* SQL指令安全过滤
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* @access public
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* @param string $str SQL字符串
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* @return string
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*/
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public function escapeString($str) {
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return addslashes($str);
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}
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/**
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* 设置当前操作模型
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* @access public
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* @param string $model 模型名
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* @return void
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*/
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public function setModel($model){
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$this->model = $model;
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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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* @param boolean $start 调试开始标记 true 开始 false 结束
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*/
|
||
|
|
protected function debug($start) {
|
||
|
|
if($this->config['debug']) {// 开启数据库调试模式
|
||
|
|
if($start) {
|
||
|
|
G('queryStartTime');
|
||
|
|
}else{
|
||
|
|
$this->modelSql[$this->model] = $this->queryStr;
|
||
|
|
//$this->model = '_think_';
|
||
|
|
// 记录操作结束时间
|
||
|
|
G('queryEndTime');
|
||
|
|
trace($this->queryStr.' [ RunTime:'.G('queryStartTime','queryEndTime').'s ]','','SQL');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 初始化数据库连接
|
||
|
|
* @access protected
|
||
|
|
* @param boolean $master 主服务器
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function initConnect($master=true) {
|
||
|
|
if(!empty($this->config['deploy']))
|
||
|
|
// 采用分布式数据库
|
||
|
|
$this->_linkID = $this->multiConnect($master);
|
||
|
|
else
|
||
|
|
// 默认单数据库
|
||
|
|
if ( !$this->_linkID ) $this->_linkID = $this->connect();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 连接分布式服务器
|
||
|
|
* @access protected
|
||
|
|
* @param boolean $master 主服务器
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
protected function multiConnect($master=false) {
|
||
|
|
// 分布式数据库配置解析
|
||
|
|
$_config['username'] = explode(',',$this->config['username']);
|
||
|
|
$_config['password'] = explode(',',$this->config['password']);
|
||
|
|
$_config['hostname'] = explode(',',$this->config['hostname']);
|
||
|
|
$_config['hostport'] = explode(',',$this->config['hostport']);
|
||
|
|
$_config['database'] = explode(',',$this->config['database']);
|
||
|
|
$_config['dsn'] = explode(',',$this->config['dsn']);
|
||
|
|
$_config['charset'] = explode(',',$this->config['charset']);
|
||
|
|
|
||
|
|
// 数据库读写是否分离
|
||
|
|
if($this->config['rw_separate']){
|
||
|
|
// 主从式采用读写分离
|
||
|
|
if($master)
|
||
|
|
// 主服务器写入
|
||
|
|
$r = floor(mt_rand(0,$this->config['master_num']-1));
|
||
|
|
else{
|
||
|
|
if(is_numeric($this->config['slave_no'])) {// 指定服务器读
|
||
|
|
$r = $this->config['slave_no'];
|
||
|
|
}else{
|
||
|
|
// 读操作连接从服务器
|
||
|
|
$r = floor(mt_rand($this->config['master_num'],count($_config['hostname'])-1)); // 每次随机连接的数据库
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}else{
|
||
|
|
// 读写操作不区分服务器
|
||
|
|
$r = floor(mt_rand(0,count($_config['hostname'])-1)); // 每次随机连接的数据库
|
||
|
|
}
|
||
|
|
$db_config = array(
|
||
|
|
'username' => isset($_config['username'][$r])?$_config['username'][$r]:$_config['username'][0],
|
||
|
|
'password' => isset($_config['password'][$r])?$_config['password'][$r]:$_config['password'][0],
|
||
|
|
'hostname' => isset($_config['hostname'][$r])?$_config['hostname'][$r]:$_config['hostname'][0],
|
||
|
|
'hostport' => isset($_config['hostport'][$r])?$_config['hostport'][$r]:$_config['hostport'][0],
|
||
|
|
'database' => isset($_config['database'][$r])?$_config['database'][$r]:$_config['database'][0],
|
||
|
|
'dsn' => isset($_config['dsn'][$r])?$_config['dsn'][$r]:$_config['dsn'][0],
|
||
|
|
'charset' => isset($_config['charset'][$r])?$_config['charset'][$r]:$_config['charset'][0],
|
||
|
|
);
|
||
|
|
return $this->connect($db_config,$r);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 析构方法
|
||
|
|
* @access public
|
||
|
|
*/
|
||
|
|
public function __destruct() {
|
||
|
|
// 释放查询
|
||
|
|
if ($this->PDOStatement){
|
||
|
|
$this->free();
|
||
|
|
}
|
||
|
|
// 关闭连接
|
||
|
|
$this->close();
|
||
|
|
}
|
||
|
|
}
|