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337 lines
10 KiB
PHP
337 lines
10 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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* Oracle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 ZhangXuehun <zhangxuehun@sohu.com>
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*/
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class Oracle extends Db{
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private $mode = OCI_COMMIT_ON_SUCCESS;
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private $table = '';
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protected $selectSql = 'SELECT * FROM (SELECT thinkphp.*, rownum AS numrow FROM (SELECT %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%) thinkphp ) %LIMIT%%COMMENT%';
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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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putenv("NLS_LANG=AMERICAN_AMERICA.UTF8");
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if ( !extension_loaded('oci8') ) {
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throw_exception(L('_NOT_SUPPERT_').'oracle');
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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 = $this->config;
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$pconnect = !empty($config['params']['persist'])? $config['params']['persist']:$this->pconnect;
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$conn = $pconnect ? 'oci_pconnect':'oci_new_connect';
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$this->linkID[$linkNum] = $conn($config['username'], $config['password'],$config['database']);//modify by wyfeng at 2008.12.19
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if (!$this->linkID[$linkNum]){
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$this->error(false);
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}
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// 标记连接成功
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$this->connected = true;
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//注销数据库安全信息
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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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oci_free_statement($this->queryID);
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$this->queryID = 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 = $str;
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//更改事务模式
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$this->mode = OCI_COMMIT_ON_SUCCESS;
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//释放前次的查询结果
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if ( $this->queryID ) $this->free();
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N('db_query',1);
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// 记录开始执行时间
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G('queryStartTime');
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$this->queryID = oci_parse($this->_linkID,$str);
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$this->debug();
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if (false === oci_execute($this->queryID, $this->mode)) {
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$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 = $str;
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// 判断新增操作
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$flag = false;
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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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}//modify by wyfeng at 2009.08.28
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//更改事务模式
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$this->mode = OCI_COMMIT_ON_SUCCESS;
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//释放前次的查询结果
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if ( $this->queryID ) $this->free();
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N('db_write',1);
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// 记录开始执行时间
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G('queryStartTime');
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$stmt = oci_parse($this->_linkID,$str);
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$this->debug();
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if (false === oci_execute($stmt)) {
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$this->error();
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return false;
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} else {
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$this->numRows = oci_num_rows($stmt);
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$this->lastInsID = $flag?$this->insertLastId():0;//modify by wyfeng at 2009.08.28
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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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$this->mode = OCI_DEFAULT;
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}
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$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 = oci_commit($this->_linkID);
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if(!$result){
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$this->error();
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return false;
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}
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$this->transTimes = 0;
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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 = oci_rollback($this->_linkID);
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if(!$result){
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$this->error();
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return false;
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}
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$this->transTimes = 0;
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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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$result = array();
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$this->numRows = oci_fetch_all($this->queryID, $result, 0, -1, OCI_FETCHSTATEMENT_BY_ROW);
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//add by wyfeng at 2008-12-23 强制将字段名转换为小写，以配合Model类函数如count等
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if(C("DB_CASE_LOWER")) {
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foreach($result as $k=>$v) {
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$result[$k] = array_change_key_case($result[$k], CASE_LOWER);
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}
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}
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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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$result = $this->query("select a.column_name,data_type,decode(nullable,'Y',0,1) notnull,data_default,decode(a.column_name,b.column_name,1,0) pk "
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."from user_tab_columns a,(select column_name from user_constraints c,user_cons_columns col "
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."where c.constraint_name=col.constraint_name and c.constraint_type='P'and c.table_name='".strtoupper($tableName)
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."') b where table_name='".strtoupper($tableName)."' and a.column_name=b.column_name(+)");
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$info = array();
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if($result) {
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foreach ($result as $key => $val) {
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$info[strtolower($val['column_name'])] = array(
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'name' => strtolower($val['column_name']),
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'type' => strtolower($val['data_type']),
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'notnull' => $val['notnull'],
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'default' => $val['data_default'],
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'primary' => $val['pk'],
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'autoinc' => $val['pk'],
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);
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}
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}
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return $info;
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}
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/**
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* 取得数据库的表信息（暂时实现取得用户表信息）
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* @access public
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*/
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public function getTables($dbName='') {
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$result = $this->query("select table_name from user_tables");
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$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 $info;
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}
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/**
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* 关闭数据库
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* @access public
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*/
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public function close() {
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if($this->_linkID){
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oci_close($this->_linkID);
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}
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$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($result = true) {
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if($result){
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$error = oci_error($this->queryID);
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}elseif(!$this->_linkID){
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$error = oci_error();
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}else{
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$error = oci_error($this->_linkID);
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}
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if('' != $this->queryStr){
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$error['message'] .= "\n [ SQL语句 ] : ".$this->queryStr;
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}
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$result? ThinkLog::record($error['message'],'ERR'):throw_exception($error['message'],'',$error['code']);
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$this->error = $error['message'];
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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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return str_ireplace("'", "''", $str);
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}
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/**
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* 获取最后插入id ,仅适用于采用序列+触发器结合生成ID的方式
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* 在config.php中指定
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'DB_TRIGGER_PREFIX' => 'tr_',
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'DB_SEQUENCE_PREFIX' => 'ts_',
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* eg:表 tb_user
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相对tb_user的序列为：
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-- Create sequence
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create sequence TS_USER
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minvalue 1
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maxvalue 999999999999999999999999999
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start with 1
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increment by 1
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nocache;
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相对tb_user,ts_user的触发器为：
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create or replace trigger TR_USER
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before insert on "TB_USER"
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for each row
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begin
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select "TS_USER".nextval into :NEW.ID from dual;
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end;
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* @access public
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* @return integer
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*/
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public function insertLastId() {
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if(empty($this->table)) {
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return 0;
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}
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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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* limit
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* @access public
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* @return string
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*/
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public function parseLimit($limit) {
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$limitStr = '';
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if(!empty($limit)) {
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$limit = explode(',',$limit);
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if(count($limit)>1)
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$limitStr = "(numrow>" . $limit[0] . ") AND (numrow<=" . ($limit[0]+$limit[1]) . ")";
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else
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$limitStr = "(numrow>0 AND numrow<=".$limit[0].")";
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}
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return $limitStr?' WHERE '.$limitStr:'';
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}
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} |