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thinkphp/library/think/Db.php
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thinkphp/library/think/Db.php
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<?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) 2006~2017 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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use think\db\Connection;
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use think\db\Query;
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/**
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* Class Db
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* @package think
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* @method Query table(string $table) static 指定数据表（含前缀）
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* @method Query name(string $name) static 指定数据表（不含前缀）
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* @method Query where(mixed $field, string $op = null, mixed $condition = null) static 查询条件
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* @method Query join(mixed $join, mixed $condition = null, string $type = 'INNER') static JOIN查询
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* @method Query union(mixed $union, boolean $all = false) static UNION查询
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* @method Query limit(mixed $offset, integer $length = null) static 查询LIMIT
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* @method Query order(mixed $field, string $order = null) static 查询ORDER
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* @method Query cache(mixed $key = null , integer $expire = null) static 设置查询缓存
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* @method mixed value(string $field) static 获取某个字段的值
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* @method array column(string $field, string $key = '') static 获取某个列的值
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* @method Query view(mixed $join, mixed $field = null, mixed $on = null, string $type = 'INNER') static 视图查询
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* @method mixed find(mixed $data = null) static 查询单个记录
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* @method mixed select(mixed $data = null) static 查询多个记录
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* @method integer insert(array $data, boolean $replace = false, boolean $getLastInsID = false, string $sequence = null) static 插入一条记录
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* @method integer insertGetId(array $data, boolean $replace = false, string $sequence = null) static 插入一条记录并返回自增ID
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* @method integer insertAll(array $dataSet) static 插入多条记录
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* @method integer update(array $data) static 更新记录
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* @method integer delete(mixed $data = null) static 删除记录
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* @method boolean chunk(integer $count, callable $callback, string $column = null) static 分块获取数据
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* @method mixed query(string $sql, array $bind = [], boolean $master = false, bool $pdo = false) static SQL查询
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* @method integer execute(string $sql, array $bind = [], boolean $fetch = false, boolean $getLastInsID = false, string $sequence = null) static SQL执行
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* @method Paginator paginate(integer $listRows = 15, mixed $simple = null, array $config = []) static 分页查询
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* @method mixed transaction(callable $callback) static 执行数据库事务
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* @method void startTrans() static 启动事务
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* @method void commit() static 用于非自动提交状态下面的查询提交
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* @method void rollback() static 事务回滚
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* @method boolean batchQuery(array $sqlArray) static 批处理执行SQL语句
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* @method string quote(string $str) static SQL指令安全过滤
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* @method string getLastInsID($sequence = null) static 获取最近插入的ID
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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 $instance = [];
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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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* 数据库初始化 并取得数据库类实例
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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 bool|string $name 连接标识 true 强制重新连接
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* @return Connection
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* @throws Exception
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*/
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public static function connect($config = [], $name = false)
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{
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if (false === $name) {
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$name = md5(serialize($config));
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}
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if (true === $name || !isset(self::$instance[$name])) {
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// 解析连接参数 支持数组和字符串
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$options = self::parseConfig($config);
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if (empty($options['type'])) {
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throw new \InvalidArgumentException('Undefined db type');
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}
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$class = false !== strpos($options['type'], '\\') ? $options['type'] : '\\think\\db\\connector\\' . ucwords($options['type']);
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// 记录初始化信息
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if (App::$debug) {
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Log::record('[ DB ] INIT ' . $options['type'], 'info');
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}
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if (true === $name) {
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$name = md5(serialize($config));
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}
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self::$instance[$name] = new $class($options);
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}
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return self::$instance[$name];
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}
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public static function clear() {
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self::$instance = null;
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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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} elseif (is_string($config) && false === strpos($config, '/')) {
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// 支持读取配置参数
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$config = Config::get($config);
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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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// 自动初始化数据库
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return call_user_func_array([self::connect(), $method], $params);
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}
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}
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