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447 lines
15 KiB
PHP
447 lines
15 KiB
PHP
<?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) 2006-2012 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\Driver;
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use Think\Db;
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/**
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* PDO数据库驱动
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* @category Extend
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* @package Extend
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* @subpackage Driver.Db
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* @author liu21st <liu21st@gmail.com>
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*/
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class Pdo extends Db{
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protected $PDOStatement = null;
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private $table = '';
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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 ( !class_exists('PDO') ) {
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throw_exception(L('_NOT_SUPPERT_').':PDO');
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}
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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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$this->config['params'] = array();
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}
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}
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}
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/**
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* 连接数据库方法
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* @access public
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*/
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public function connect($config='',$linkNum=0) {
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if ( !isset($this->linkID[$linkNum]) ) {
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if(empty($config)) $config = $this->config;
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if($this->pconnect) {
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$config['params'][PDO::ATTR_PERSISTENT] = true;
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}
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//$config['params'][PDO::ATTR_CASE] = C("DB_CASE_LOWER")?PDO::CASE_LOWER:PDO::CASE_UPPER;
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try{
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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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// 因为PDO的连接切换可能导致数据库类型不同，因此重新获取下当前的数据库类型
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$this->dbType = $this->_getDsnType($config['dsn']);
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if(in_array($this->dbType,array('MSSQL','ORACLE','IBASE','OCI'))) {
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// 由于PDO对于以上的数据库支持不够完美，所以屏蔽了 如果仍然希望使用PDO 可以注释下面一行代码
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throw_exception('由于目前PDO暂时不能完美支持'.$this->dbType.' 请使用官方的'.$this->dbType.'驱动');
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}
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$this->linkID[$linkNum]->exec('SET NAMES '.C('DB_CHARSET'));
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// 标记连接成功
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$this->connected = true;
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// 注销数据库连接配置信息
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if(1 != C('DB_DEPLOY_TYPE')) unset($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) {
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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) ) $this->free();
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N('db_query',1);
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// 记录开始执行时间
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G('queryStartTime');
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$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 = $this->PDOStatement->execute();
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$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->getAll();
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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) {
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$this->initConnect(true);
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if ( !$this->_linkID ) return false;
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$this->queryStr = $str;
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$flag = false;
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if($this->dbType == 'OCI')
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{
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if(preg_match("/^\s*(INSERT\s+INTO)\s+(\w+)\s+/i", $this->queryStr, $match)) {
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$this->table = C("DB_SEQUENCE_PREFIX").str_ireplace(C("DB_PREFIX"), "", $match[2]);
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$flag = (boolean)$this->query("SELECT * FROM user_sequences WHERE sequence_name='" . strtoupper($this->table) . "'");
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}
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}//modify by wyfeng at 2009.08.28
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//释放前次的查询结果
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if ( !empty($this->PDOStatement) ) $this->free();
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N('db_write',1);
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// 记录开始执行时间
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G('queryStartTime');
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$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 = $this->PDOStatement->execute();
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$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 = $this->PDOStatement->rowCount();
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if($flag || 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 $this->numRows;
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}
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}
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/**
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* 启动事务
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* @access public
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* @return void
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*/
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public function startTrans() {
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$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 getAll() {
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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 $result;
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}
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/**
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* 取得数据表的字段信息
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* @access public
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*/
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public function getFields($tableName) {
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$this->initConnect(true);
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if(C('DB_DESCRIBE_TABLE_SQL')) {
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// 定义特殊的字段查询SQL
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$sql = str_replace('%table%',$tableName,C('DB_DESCRIBE_TABLE_SQL'));
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}else{
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switch($this->dbType) {
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case 'MSSQL':
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case 'SQLSRV':
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$sql = "SELECT column_name as 'Name', data_type as 'Type', column_default as 'Default', is_nullable as 'Null'
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FROM information_schema.tables AS t
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JOIN information_schema.columns AS c
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ON t.table_catalog = c.table_catalog
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AND t.table_schema = c.table_schema
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AND t.table_name = c.table_name
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WHERE t.table_name = '$tableName'";
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break;
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case 'SQLITE':
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$sql = 'PRAGMA table_info ('.$tableName.') ';
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break;
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case 'ORACLE':
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case 'OCI':
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$sql = "SELECT a.column_name \"Name\",data_type \"Type\",decode(nullable,'Y',0,1) notnull,data_default \"Default\",decode(a.column_name,b.column_name,1,0) \"pk\" "
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."FROM user_tab_columns a,(SELECT column_name FROM user_constraints c,user_cons_columns col "
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."WHERE c.constraint_name=col.constraint_name AND c.constraint_type='P' and c.table_name='".strtoupper($tableName)
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."') b where table_name='".strtoupper($tableName)."' and a.column_name=b.column_name(+)";
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break;
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case 'PGSQL':
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$sql = 'select fields_name as "Name",fields_type as "Type",fields_not_null as "Null",fields_key_name as "Key",fields_default as "Default",fields_default as "Extra" from table_msg('.$tableName.');';
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break;
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case 'IBASE':
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break;
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case 'MYSQL':
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default:
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$sql = 'DESCRIBE '.$tableName;//备注: 驱动类不只针对mysql，不能加``
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}
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}
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$result = $this->query($sql);
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$info = array();
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if($result) {
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foreach ($result as $key => $val) {
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$val = array_change_key_case($val);
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$val['name'] = isset($val['name'])?$val['name']:"";
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$val['type'] = isset($val['type'])?$val['type']:"";
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$name = isset($val['field'])?$val['field']:$val['name'];
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$info[$name] = array(
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'name' => $name ,
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'type' => $val['type'],
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'notnull' => (bool)(((isset($val['null'])) && ($val['null'] === '')) || ((isset($val['notnull'])) && ($val['notnull'] === ''))), // not null is empty, null is yes
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'default' => isset($val['default'])? $val['default'] :(isset($val['dflt_value'])?$val['dflt_value']:""),
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'primary' => isset($val['dey'])?strtolower($val['dey']) == 'pri':(isset($val['pk'])?$val['pk']:false),
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'autoinc' => isset($val['extra'])?strtolower($val['extra']) == 'auto_increment':(isset($val['key'])?$val['key']:false),
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);
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}
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}
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return $info;
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}
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/**
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* 取得数据库的表信息
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* @access public
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*/
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public function getTables($dbName='') {
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if(C('DB_FETCH_TABLES_SQL')) {
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// 定义特殊的表查询SQL
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$sql = str_replace('%db%',$dnName,C('DB_FETCH_TABLES_SQL'));
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}else{
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switch($this->dbType) {
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case 'ORACLE':
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case 'OCI':
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$sql = 'SELECT table_name FROM user_tables';
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break;
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case 'MSSQL':
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case 'SQLSRV':
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$sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'";
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break;
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case 'PGSQL':
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$sql = "select tablename as Tables_in_test from pg_tables where schemaname ='public'";
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break;
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case 'IBASE':
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// 暂时不支持
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throw_exception(L('_NOT_SUPPORT_DB_').':IBASE');
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break;
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case 'SQLITE':
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$sql = "SELECT name FROM sqlite_master WHERE type='table' "
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. "UNION ALL SELECT name FROM sqlite_temp_master "
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. "WHERE type='table' ORDER BY name";
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break;
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case 'MYSQL':
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default:
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if(!empty($dbName)) {
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$sql = 'SHOW TABLES FROM '.$dbName;
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}else{
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$sql = 'SHOW TABLES ';
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}
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}
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}
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$result = $this->query($sql);
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$info = array();
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foreach ($result as $key => $val) {
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$info[$key] = current($val);
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}
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return $info;
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}
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/**
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* limit分析
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* @access protected
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* @param mixed $lmit
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* @return string
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*/
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protected function parseLimit($limit) {
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$limitStr = '';
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if(!empty($limit)) {
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switch($this->dbType){
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case 'PGSQL':
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case 'SQLITE':
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$limit = explode(',',$limit);
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if(count($limit)>1) {
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$limitStr .= ' LIMIT '.$limit[1].' OFFSET '.$limit[0].' ';
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}else{
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$limitStr .= ' LIMIT '.$limit[0].' ';
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}
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break;
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case 'MSSQL':
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case 'SQLSRV':
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break;
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case 'IBASE':
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// 暂时不支持
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break;
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case 'ORACLE':
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case 'OCI':
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break;
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case 'MYSQL':
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default:
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$limitStr .= ' LIMIT '.$limit.' ';
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}
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}
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return $limitStr;
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}
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/**
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* 字段和表名处理
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* @access protected
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* @param string $key
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* @return string
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*/
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protected function parseKey(&$key) {
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if($this->dbType=='MYSQL'){
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$key = trim($key);
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if(!preg_match('/[,\'\"\*\(\)`.\s]/',$key)) {
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$key = '`'.$key.'`';
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}
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return $key;
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}else{
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return parent::parseKey($key);
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}
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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 ] : ".$this->queryStr;
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}
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ThinkLog::record($this->error,'ERR');
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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 $str SQL指令
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* @return string
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*/
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public function escapeString($str) {
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switch($this->dbType) {
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case 'PGSQL':
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case 'MSSQL':
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case 'SQLSRV':
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case 'MYSQL':
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return addslashes($str);
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case 'IBASE':
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case 'SQLITE':
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case 'ORACLE':
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case 'OCI':
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return str_ireplace("'", "''", $str);
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}
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}
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/**
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* 获取最后插入id
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* @access public
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* @return integer
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*/
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public function getLastInsertId() {
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switch($this->dbType) {
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case 'PGSQL':
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case 'SQLITE':
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case 'MSSQL':
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case 'SQLSRV':
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case 'IBASE':
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case 'MYSQL':
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return $this->_linkID->lastInsertId();
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case 'ORACLE':
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case 'OCI':
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$sequenceName = $this->table;
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$vo = $this->query("SELECT {$sequenceName}.currval currval FROM dual");
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return $vo?$vo[0]["currval"]:0;
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}
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}
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} |