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533 lines
16 KiB
533 lines
16 KiB
<?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 PDO;
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use Think\Config;
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use Think\Debug;
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class Lite
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{
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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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// 事物操作PDO实例
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protected $transPDO = null;
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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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{
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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 = '', $linkNum = 0)
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{
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if (!isset($this->linkID[$linkNum])) {
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if (empty($config)) {
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$config = $this->config;
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}
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try {
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if (empty($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', '<=')) {
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//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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/**
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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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{
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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, $bind = array())
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{
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$this->initConnect(false);
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if (!$this->_linkID) {
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return false;
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}
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$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)) {
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$this->free();
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}
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$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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}
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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, $bind = array())
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{
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$this->initConnect(true);
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if (!$this->_linkID) {
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return false;
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}
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$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)) {
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$this->free();
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}
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$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 $this->numRows;
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}
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}
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/**
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* 启动事务
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* @access public
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* @return void
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*/
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public function startTrans()
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{
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$this->initConnect(true);
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if (!$this->_linkID) {
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return false;
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}
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//数据rollback 支持
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if (0 == $this->transTimes) {
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// 记录当前操作PDO
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$this->transPdo = $this->_linkID;
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$this->_linkID->beginTransaction();
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}
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$this->transTimes++;
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return;
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}
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/**
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* 用于非自动提交状态下面的查询提交
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* @access public
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* @return boolean
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*/
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public function commit()
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{
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if ($this->transTimes == 1) {
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// 由嵌套事物的最外层进行提交
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$result = $this->_linkID->commit();
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$this->transTimes = 0;
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$this->transPdo = null;
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if (!$result) {
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$this->error();
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return false;
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}
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} else {
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$this->transTimes--;
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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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{
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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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$this->transPdo = null;
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if (!$result) {
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$this->error();
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return false;
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}
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}
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return true;
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}
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/**
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* 获得所有的查询数据
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* @access private
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* @return array
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*/
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private function getResult()
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{
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//返回数据集
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$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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{
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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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{
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return $this->executeTimes;
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}
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/**
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* 关闭数据库
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* @access public
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*/
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public function close()
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{
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$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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{
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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 ($this->config['debug']) {
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// 开启数据库调试模式
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E($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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{
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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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{
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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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{
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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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{
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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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{
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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 $start 调试开始标记 true 开始 false 结束
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*/
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protected function debug($start)
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{
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if ($this->config['debug']) {
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// 开启数据库调试模式
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if ($start) {
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G('queryStartTime');
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} else {
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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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G('queryEndTime');
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trace($this->queryStr . ' [ RunTime:' . G('queryStartTime', 'queryEndTime') . 's ]', '', 'SQL');
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}
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}
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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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{
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// 开启事物时用同一个连接进行操作
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if ($this->transPDO) {
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return $this->transPDO;
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}
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if (!empty($this->config['deploy']))
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// 采用分布式数据库
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{
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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 (!$this->_linkID) {
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$this->_linkID = $this->connect();
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}
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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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{
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// 分布式数据库配置解析
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$_config['username'] = explode(',', $this->config['username']);
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$_config['password'] = explode(',', $this->config['password']);
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$_config['hostname'] = explode(',', $this->config['hostname']);
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$_config['hostport'] = explode(',', $this->config['hostport']);
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$_config['database'] = explode(',', $this->config['database']);
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$_config['dsn'] = explode(',', $this->config['dsn']);
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$_config['charset'] = explode(',', $this->config['charset']);
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// 数据库读写是否分离
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if ($this->config['rw_separate']) {
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// 主从式采用读写分离
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if ($master)
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// 主服务器写入
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{
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$r = floor(mt_rand(0, $this->config['master_num'] - 1));
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} else {
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if (is_numeric($this->config['slave_no'])) {
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// 指定服务器读
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$r = $this->config['slave_no'];
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} else {
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// 读操作连接从服务器
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$r = floor(mt_rand($this->config['master_num'], count($_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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$db_config = array(
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'username' => isset($_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] : $_config['dsn'][0],
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'charset' => isset($_config['charset'][$r]) ? $_config['charset'][$r] : $_config['charset'][0],
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);
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return $this->connect($db_config, $r);
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}
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/**
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* 析构方法
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* @access public
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*/
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public function __destruct()
|
|
{
|
|
// 释放查询
|
|
if ($this->PDOStatement) {
|
|
$this->free();
|
|
}
|
|
// 关闭连接
|
|
$this->close();
|
|
}
|
|
}
|