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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: DbPdo.class.php 2729 2012-02-12 04:13:34Z liu21st $
/**
+-----------------------------
* PDO数据库驱动类
+-----------------------------
*/
class DbPdo extends Db{
protected $PDOStatement = null;
private $table = '';
/**
+----------------------------------------------------------
* 架构函数 读取数据库配置信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param array $config 数据库配置数组
+----------------------------------------------------------
*/
public function __construct($config=''){
if ( !class_exists('PDO') ) {
throw_exception(L('_NOT_SUPPERT_').':PDO');
}
if(!empty($config)) {
$this->config = $config;
if(empty($this->config['params'])) {
$this->config['params'] = array();
}
}
}
/**
+----------------------------------------------------------
* 连接数据库方法
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function connect($config='',$linkNum=0) {
if ( !isset($this->linkID[$linkNum]) ) {
if(empty($config)) $config = $this->config;
if($this->pconnect) {
$config['params'][PDO::ATTR_PERSISTENT] = true;
}
//$config['params'][PDO::ATTR_CASE] = C("DB_CASE_LOWER")?PDO::CASE_LOWER:PDO::CASE_UPPER;
try{
$this->linkID[$linkNum] = new PDO( $config['dsn'], $config['username'], $config['password'],$config['params']);
}catch (PDOException $e) {
throw_exception($e->getMessage());
}
// 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
$this->dbType = $this->_getDsnType($config['dsn']);
if(in_array($this->dbType,array('MSSQL','ORACLE','IBASE','OCI'))) {
// 由于PDO对于以上的数据库支持不够完美，所以屏蔽了 如果仍然希望使用PDO 可以注释下面一行代码
throw_exception('由于目前PDO暂时不能完美支持'.$this->dbType.' 请使用官方的'.$this->dbType.'驱动');
}
$this->linkID[$linkNum]->exec('SET NAMES '.C('DB_CHARSET'));
// 标记连接成功
$this->connected = true;
// 注销数据库连接配置信息
if(1 != C('DB_DEPLOY_TYPE')) unset($this->config);
}
return $this->linkID[$linkNum];
}
/**
+----------------------------------------------------------
* 释放查询结果
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function free() {
$this->PDOStatement = null;
}
/**
+----------------------------------------------------------
* 执行查询 返回数据集
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $str sql指令
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function query($str) {
$this->initConnect(false);
if ( !$this->_linkID ) return false;
$this->queryStr = $str;
//释放前次的查询结果
if ( !empty($this->PDOStatement) ) $this->free();
N('db_query',1);
// 记录开始执行时间
G('queryStartTime');
$this->PDOStatement = $this->_linkID->prepare($str);
if(false === $this->PDOStatement)
throw_exception($this->error());
$result = $this->PDOStatement->execute();
$this->debug();
if ( false === $result ) {
$this->error();
return false;
} else {
return $this->getAll();
}
}
/**
+----------------------------------------------------------
* 执行语句
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $str sql指令
+----------------------------------------------------------
* @return integer
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function execute($str) {
$this->initConnect(true);
if ( !$this->_linkID ) return false;
$this->queryStr = $str;
$flag = false;
if($this->dbType == 'OCI')
{
if(preg_match("/^\s*(INSERT\s+INTO)\s+(\w+)\s+/i", $this->queryStr, $match)) {
$this->table = C("DB_SEQUENCE_PREFIX").str_ireplace(C("DB_PREFIX"), "", $match[2]);
$flag = (boolean)$this->query("SELECT * FROM user_sequences WHERE sequence_name='" . strtoupper($this->table) . "'");
}
}//modify by wyfeng at 2009.08.28
//释放前次的查询结果
if ( !empty($this->PDOStatement) ) $this->free();
N('db_write',1);
// 记录开始执行时间
G('queryStartTime');
$this->PDOStatement = $this->_linkID->prepare($str);
if(false === $this->PDOStatement) {
throw_exception($this->error());
}
$result = $this->PDOStatement->execute();
$this->debug();
if ( false === $result) {
$this->error();
return false;
} else {
$this->numRows = $result;
if($flag || preg_match("/^\s*(INSERT\s+INTO|REPLACE\s+INTO)\s+/i", $str)) {
$this->lastInsID = $this->getLastInsertId();
}
return $this->numRows;
}
}
/**
+----------------------------------------------------------
* 启动事务
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return void
+----------------------------------------------------------
*/
public function startTrans() {
$this->initConnect(true);
if ( !$this->_linkID ) return false;
//数据rollback 支持
if ($this->transTimes == 0) {
$this->_linkID->beginTransaction();
}
$this->transTimes++;
return ;
}
/**
+----------------------------------------------------------
* 用于非自动提交状态下面的查询提交
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function commit() {
if ($this->transTimes > 0) {
$result = $this->_linkID->commit();
$this->transTimes = 0;
if(!$result){
throw_exception($this->error());
}
}
return true;
}
/**
+----------------------------------------------------------
* 事务回滚
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function rollback() {
if ($this->transTimes > 0) {
$result = $this->_linkID->rollback();
$this->transTimes = 0;
if(!$result){
throw_exception($this->error());
}
}
return true;
}
/**
+----------------------------------------------------------
* 获得所有的查询数据
+----------------------------------------------------------
* @access private
+----------------------------------------------------------
* @return array
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
private function getAll() {
//返回数据集
$result = $this->PDOStatement->fetchAll(constant('PDO::FETCH_ASSOC'));
$this->numRows = count( $result );
return $result;
}
/**
+----------------------------------------------------------
* 取得数据表的字段信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function getFields($tableName) {
$this->initConnect(true);
if(C('DB_DESCRIBE_TABLE_SQL')) {
// 定义特殊的字段查询SQL
$sql = str_replace('%table%',$tableName,C('DB_DESCRIBE_TABLE_SQL'));
}else{
switch($this->dbType) {
case 'MSSQL':
case 'SQLSRV':
$sql = "SELECT column_name as 'Name', data_type as 'Type', column_default as 'Default', is_nullable as 'Null'
FROM information_schema.tables AS t
JOIN information_schema.columns AS c
ON t.table_catalog = c.table_catalog
AND t.table_schema = c.table_schema
AND t.table_name = c.table_name
WHERE t.table_name = '$tableName'";
break;
case 'SQLITE':
$sql = 'PRAGMA table_info ('.$tableName.') ';
break;
case 'ORACLE':
case 'OCI':
$sql = "SELECT a.column_name \"Name\",data_type \"Type\",decode(nullable,'Y',0,1) notnull,data_default \"Default\",decode(a.column_name,b.column_name,1,0) \"pk\" "
."FROM user_tab_columns a,(SELECT column_name FROM user_constraints c,user_cons_columns col "
."WHERE c.constraint_name=col.constraint_name AND c.constraint_type='P' and c.table_name='".strtoupper($tableName)
."') b where table_name='".strtoupper($tableName)."' and a.column_name=b.column_name(+)";
break;
case 'PGSQL':
$sql = 'select fields_name as "Name",fields_type as "Type",fields_not_null as "Null",fields_key_name as "Key",fields_default as "Default",fields_default as "Extra" from table_msg('.$tableName.');';
break;
case 'IBASE':
break;
case 'MYSQL':
default:
$sql = 'DESCRIBE '.$tableName;//备注: 驱动类不只针对mysql，不能加``
}
}
$result = $this->query($sql);
$info = array();
if($result) {
foreach ($result as $key => $val) {
$val['Name'] = isset($val['name'])?$val['name']:$val['Name'];
$val['Type'] = isset($val['type'])?$val['type']: $val['Type'];
$name= strtolower(isset($val['Field'])?$val['Field']:$val['Name']);
$info[$name] = array(
'name' => $name ,
'type' => $val['Type'],
'notnull' => (bool)(((isset($val['Null'])) && ($val['Null'] === '')) || ((isset($val['notnull'])) && ($val['notnull'] === ''))), // not null is empty, null is yes
'default' => isset($val['Default'])? $val['Default'] :(isset($val['dflt_value'])?$val['dflt_value']:""),
'primary' => isset($val['Key'])?strtolower($val['Key']) == 'pri':(isset($val['pk'])?$val['pk']:false),
'autoinc' => isset($val['Extra'])?strtolower($val['Extra']) == 'auto_increment':(isset($val['Key'])?$val['Key']:false),
);
}
}
return $info;
}
/**
+----------------------------------------------------------
* 取得数据库的表信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function getTables($dbName='') {
if(C('DB_FETCH_TABLES_SQL')) {
// 定义特殊的表查询SQL
$sql = str_replace('%db%',$dnName,C('DB_FETCH_TABLES_SQL'));
}else{
switch($this->dbType) {
case 'ORACLE':
case 'OCI':
$sql = 'SELECT table_name FROM user_tables';
break;
case 'MSSQL':
case 'SQLSRV':
$sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'";
break;
case 'PGSQL':
$sql = "select tablename as Tables_in_test from pg_tables where schemaname ='public'";
break;
case 'IBASE':
// 暂时不支持
throw_exception(L('_NOT_SUPPORT_DB_').':IBASE');
break;
case 'SQLITE':
$sql = "SELECT name FROM sqlite_master WHERE type='table' "
. "UNION ALL SELECT name FROM sqlite_temp_master "
. "WHERE type='table' ORDER BY name";
break;
case 'MYSQL':
default:
if(!empty($dbName)) {
$sql = 'SHOW TABLES FROM '.$dbName;
}else{
$sql = 'SHOW TABLES ';
}
}
}
$result = $this->query($sql);
$info = array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/**
+----------------------------------------------------------
* limit分析
+----------------------------------------------------------
* @access protected
+----------------------------------------------------------
* @param mixed $lmit
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
protected function parseLimit($limit) {
$limitStr = '';
if(!empty($limit)) {
switch($this->dbType){
case 'PGSQL':
case 'SQLITE':
$limit = explode(',',$limit);
if(count($limit)>1) {
$limitStr .= ' LIMIT '.$limit[1].' OFFSET '.$limit[0].' ';
}else{
$limitStr .= ' LIMIT '.$limit[0].' ';
}
break;
case 'MSSQL':
case 'SQLSRV':
break;
case 'IBASE':
// 暂时不支持
break;
case 'ORACLE':
case 'OCI':
break;
case 'MYSQL':
default:
$limitStr .= ' LIMIT '.$limit.' ';
}
}
return $limitStr;
}
/**
+----------------------------------------------------------
* 关闭数据库
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function close() {
$this->_linkID = null;
}
/**
+----------------------------------------------------------
* 数据库错误信息
* 并显示当前的SQL语句
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
public function error() {
if($this->PDOStatement) {
$error = $this->PDOStatement->errorInfo();
$this->error = $error[2];
}else{
$this->error = '';
}
if($this->debug && '' != $this->queryStr){
$this->error .= "\n [ SQL语句 ] : ".$this->queryStr;
}
return $this->error;
}
/**
+----------------------------------------------------------
* SQL指令安全过滤
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $str SQL指令
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
public function escapeString($str) {
switch($this->dbType) {
case 'PGSQL':
case 'MSSQL':
case 'SQLSRV':
case 'IBASE':
case 'MYSQL':
return addslashes($str);
case 'SQLITE':
case 'ORACLE':
case 'OCI':
return str_ireplace("'", "''", $str);
}
}
/**
+----------------------------------------------------------
* 获取最后插入id
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return integer
+----------------------------------------------------------
*/
public function getLastInsertId() {
switch($this->dbType) {
case 'PGSQL':
case 'SQLITE':
case 'MSSQL':
case 'SQLSRV':
case 'IBASE':
case 'MYSQL':
return $this->_linkID->lastInsertId();
case 'ORACLE':
case 'OCI':
$sequenceName = $this->table;
$vo = $this->query("SELECT {$sequenceName}.currval currval FROM dual");
return $vo?$vo[0]["currval"]:0;
}
}
}
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