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114 lines
3.7 KiB
PHP
114 lines
3.7 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2016 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;
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/**
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* ThinkPHP 数据库中间层实现类
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*/
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class Db
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{
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// 数据库连接实例
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private static $instances = [];
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// 当前数据库连接实例
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private static $instance = null;
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// 查询次数
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public static $queryTimes = 0;
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// 执行次数
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public static $executeTimes = 0;
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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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* @param mixed $config 连接配置
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* @param boolean $lite 是否lite方式
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* @return Object 返回数据库驱动类
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*/
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public static function instance($config = [], $lite = false)
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{
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$md5 = md5(serialize($config));
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if (!isset(self::$instances[$md5])) {
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// 解析连接参数 支持数组和字符串
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$options = self::parseConfig($config);
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if (empty($options['type'])) {
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throw new Exception('db type error');
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}
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// 如果采用lite方式 仅支持原生SQL 包括query和execute方法
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$class = $lite ? '\\think\\db\\Lite' : (!empty($options['namespace']) ? $options['namespace'] : '\\think\\db\\driver\\') . ucwords($options['type']);
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self::$instances[$md5] = new $class($options);
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}
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self::$instance = self::$instances[$md5];
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return self::$instance;
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}
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/**
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* 数据库连接参数解析
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* @static
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* @access private
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* @param mixed $config
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* @return array
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*/
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private static function parseConfig($config)
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{
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if (empty($config)) {
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$config = Config::get('database');
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if (Config::get('use_db_switch')) {
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$status = Config::get('app_status');
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$config = $config[$status ?: 'default'];
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}
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}
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if (is_string($config)) {
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return self::parseDsn($config);
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} else {
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return $config;
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}
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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?param1=val1¶m2=val2#utf8
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* @static
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* @access private
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* @param string $dsnStr
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* @return array
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*/
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private static function parseDsn($dsnStr)
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{
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$info = parse_url($dsnStr);
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if (!$info) {
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return [];
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}
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$dsn = [
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'type' => $info['scheme'],
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'username' => isset($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']) ? $info['port'] : '',
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'database' => !empty($info['path']) ? ltrim($info['path'], '/') : '',
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'charset' => isset($info['fragment']) ? $info['fragment'] : 'utf8',
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];
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if (isset($info['query'])) {
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parse_str($info['query'], $dsn['params']);
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} else {
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$dsn['params'] = [];
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}
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return $dsn;
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}
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// 调用驱动类的方法
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public static function __callStatic($method, $params)
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{
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return call_user_func_array([self::$instance, $method], $params);
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}
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}
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