mirror of
https://gitee.com/fastadminnet/framework.git
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387 lines
12 KiB
PHP
387 lines
12 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\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 = [];
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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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// 数据库连接参数配置
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protected $config = [];
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protected $queryTimes = 0;
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protected $executeTimes = 0;
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// PDO连接参数
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protected $options = [
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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 = $config;
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if(empty($this->config['params'])) {
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$this->config['params'] = [];
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}
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$this->config['params'] = $this->options+$this->config['params'];
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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'] = $config['dbms'].':dbname='.$config['database'].';host='.$config['hostname'];
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if(!empty($config['hostport'])) {
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$config['dsn'] .= ';port='.$config['hostport'];
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}elseif(!empty($config['unix_socket'])){
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$config['dsn'] .= ';unix_socket='.$config['unix_socket'];
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}
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}
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$this->linkID[$linkNum] = new PDO( $config['dsn'], $config['username'], $config['password'],$config['params']);
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}catch (\PDOException $e) {
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throw_exception($e->getMessage());
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}
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if(!empty($config['charset'])) {
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$this->linkID[$linkNum]->exec('SET NAMES '.$config['charset']);
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}
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// 注销数据库连接配置信息
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if(1 != $config['deploy']) $this->config = [];
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}
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return $this->linkID[$linkNum];
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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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$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 $str sql指令
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* @return mixed
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*/
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public function query($str,$bind=[]) {
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$this->initConnect(false);
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if ( !$this->_linkID ) return false;
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$this->queryStr = $str;
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//释放前次的查询结果
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if ( !empty($this->PDOStatement) ) $this->free();
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$this->queryTimes++;
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// 记录开始执行时间
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Debug::remark('queryStartTime','time');
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$this->PDOStatement = $this->_linkID->prepare($str);
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if(false === $this->PDOStatement)
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throw_exception($this->error());
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$result = $this->PDOStatement->execute($bind);
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$this->debug();
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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 $str sql指令
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* @return integer
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*/
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public function execute($str,$bind=[]) {
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$this->initConnect(true);
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if ( !$this->_linkID ) return false;
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$this->queryStr = $str;
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//释放前次的查询结果
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if ( !empty($this->PDOStatement) ) $this->free();
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$this->executeTimes++;
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// 记录开始执行时间
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Debug::remark('queryStartTime','time');
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$this->PDOStatement = $this->_linkID->prepare($str);
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if(false === $this->PDOStatement) {
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throw_exception($this->error());
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}
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$result = $this->PDOStatement->execute($bind);
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$this->debug();
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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->getLastInsertId();
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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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* 获取最后插入id
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* @access public
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* @return integer
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*/
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public function getLastInsertId() {
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return $this->_linkID->lastInsertId();
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}
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/**
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* 启动事务
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* @access public
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* @return void
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*/
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public function startTrans() {
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$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 boolen
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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 boolen
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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 $result;
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}
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/**
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* 关闭数据库
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* @access public
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*/
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public function close() {
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$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 = $error[2];
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}else{
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$this->error = '';
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}
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if('' != $this->queryStr){
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$this->error .= "\n [ SQL语句 ] : ".$this->queryStr;
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}
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Log::record($this->error,'ERR');
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return $this->error;
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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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* 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 = $model;
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}
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/**
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* 数据库调试 记录当前SQL
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* @access protected
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*/
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protected function debug() {
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$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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* 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(1 == $this->config['deploy'])
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// 采用分布式数据库
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$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->_linkID ) $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(',',$val);
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}
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}
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// 数据库读写是否分离
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if(Config::get('db_rw_separate')){
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// 主从式采用读写分离
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if($master)
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// 主服务器写入
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$r = floor(mt_rand(0,Config::get('db_master_num')-1));
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else{
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if(is_numeric(Config::get('db_slave_no'))) {// 指定服务器读
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$r = Config::get('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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$r = floor(mt_rand(Config::get('db_master_num'),count($_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,$r);
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}
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/**
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* 析构方法
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* @access public
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*/
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public function __destruct() {
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// 释放查询
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if ($this->queryID){
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$this->free();
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}
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// 关闭连接
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$this->close();
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}
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} |