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thinkphp
2013-03-13 14:15:52 +08:00
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Think/Db/Driver/Mysql.php Normal file
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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>
// +----------------------------------------------------------------------
namespace Think\Db\Driver;
use Think\Db;
/**
* Mysql数据库驱动类
* @category Think
* @package Think
* @subpackage Driver.Db
* @author liu21st <liu21st@gmail.com>
*/
class Mysql extends Db{
/**
* 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 ( !extension_loaded('mysql') ) {
throw_exception(L('_NOT_SUPPERT_').':mysql');
}
if(!empty($config)) {
$this->config = $config;
if(empty($this->config['params'])) {
$this->config['params'] = '';
}
}
}
/**
* 连接数据库方法
* @access public
* @throws ThinkExecption
*/
public function connect($config='',$linkNum=0,$force=false) {
if ( !isset($this->linkID[$linkNum]) ) {
if(empty($config)) $config = $this->config;
// 处理不带端口号的socket连接情况
$host = $config['hostname'].($config['hostport']?":{$config['hostport']}":'');
// 是否长连接
$pconnect = !empty($config['params']['persist'])? $config['params']['persist']:$this->pconnect;
if($pconnect) {
$this->linkID[$linkNum] = mysql_pconnect( $host, $config['username'], $config['password'],131072);
}else{
$this->linkID[$linkNum] = mysql_connect( $host, $config['username'], $config['password'],true,131072);
}
if ( !$this->linkID[$linkNum] || (!empty($config['database']) && !mysql_select_db($config['database'], $this->linkID[$linkNum])) ) {
throw_exception(mysql_error());
}
$dbVersion = mysql_get_server_info($this->linkID[$linkNum]);
//使用UTF8存取数据库
mysql_query("SET NAMES '".$this->conf['db_charset']."'", $this->linkID[$linkNum]);
//设置 sql_model
if($dbVersion >'5.0.1'){
mysql_query("SET sql_mode=''",$this->linkID[$linkNum]);
}
// 标记连接成功
$this->connected = true;
// 注销数据库连接配置信息
if(1 != $this->conf['db_deploy_type']) unset($this->config);
}
return $this->linkID[$linkNum];
}
/**
* 释放查询结果
* @access public
*/
public function free() {
mysql_free_result($this->queryID);
$this->queryID = null;
}
/**
* 执行查询 返回数据集
* @access public
* @param string $str sql指令
* @return mixed
*/
public function query($str) {
if(0===stripos($str, 'call')){ // 存储过程查询支持
$this->close();
}
$this->initConnect(false);
if ( !$this->_linkID ) return false;
$this->queryStr = $str;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
N('db_query',1);
// 记录开始执行时间
\Think\Debug::remark('queryStartTime','time');
$this->queryID = mysql_query($str, $this->_linkID);
$this->debug();
if ( false === $this->queryID ) {
$this->error();
return false;
} else {
$this->numRows = mysql_num_rows($this->queryID);
return $this->getAll();
}
}
/**
* 执行语句
* @access public
* @param string $str sql指令
* @return integer|false
*/
public function execute($str) {
$this->initConnect(true);
if ( !$this->_linkID ) return false;
$this->queryStr = $str;
//释放前次的查询结果
if ( $this->queryID ) { $this->free(); }
N('db_write',1);
// 记录开始执行时间
\Think\Debug::remark('queryStartTime','time');
$result = mysql_query($str, $this->_linkID) ;
$this->debug();
if ( false === $result) {
$this->error();
return false;
} else {
$this->numRows = mysql_affected_rows($this->_linkID);
$this->lastInsID = mysql_insert_id($this->_linkID);
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) {
mysql_query('START TRANSACTION', $this->_linkID);
}
$this->transTimes++;
return ;
}
/**
* 用于非自动提交状态下面的查询提交
* @access public
* @return boolen
*/
public function commit() {
if ($this->transTimes > 0) {
$result = mysql_query('COMMIT', $this->_linkID);
$this->transTimes = 0;
if(!$result){
$this->error();
return false;
}
}
return true;
}
/**
* 事务回滚
* @access public
* @return boolen
*/
public function rollback() {
if ($this->transTimes > 0) {
$result = mysql_query('ROLLBACK', $this->_linkID);
$this->transTimes = 0;
if(!$result){
$this->error();
return false;
}
}
return true;
}
/**
* 获得所有的查询数据
* @access private
* @return array
*/
private function getAll() {
//返回数据集
$result = array();
if($this->numRows >0) {
while($row = mysql_fetch_assoc($this->queryID)){
$result[] = $row;
}
mysql_data_seek($this->queryID,0);
}
return $result;
}
/**
* 取得数据表的字段信息
* @access public
* @return array
*/
public function getFields($tableName) {
$result = $this->query('SHOW COLUMNS FROM '.$this->parseKey($tableName));
$info = array();
if($result) {
foreach ($result as $key => $val) {
$info[$val['Field']] = array(
'name' => $val['Field'],
'type' => $val['Type'],
'notnull' => (bool) ($val['Null'] === ''), // not null is empty, null is yes
'default' => $val['Default'],
'primary' => (strtolower($val['Key']) == 'pri'),
'autoinc' => (strtolower($val['Extra']) == 'auto_increment'),
);
}
}
return $info;
}
/**
* 取得数据库的表信息
* @access public
* @return array
*/
public function getTables($dbName='') {
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;
}
/**
* 替换记录
* @access public
* @param mixed $data 数据
* @param array $options 参数表达式
* @return false | integer
*/
public function replace($data,$options=array()) {
foreach ($data as $key=>$val){
$value = $this->parseValue($val);
if(is_scalar($value)) { // 过滤非标量数据
$values[] = $value;
$fields[] = $this->parseKey($key);
}
}
$sql = 'REPLACE INTO '.$this->parseTable($options['table']).' ('.implode(',', $fields).') VALUES ('.implode(',', $values).')';
return $this->execute($sql);
}
/**
* 插入记录
* @access public
* @param mixed $datas 数据
* @param array $options 参数表达式
* @param boolean $replace 是否replace
* @return false | integer
*/
public function insertAll($datas,$options=array(),$replace=false) {
if(!is_array($datas[0])) return false;
$fields = array_keys($datas[0]);
array_walk($fields, array($this, 'parseKey'));
$values = array();
foreach ($datas as $data){
$value = array();
foreach ($data as $key=>$val){
$val = $this->parseValue($val);
if(is_scalar($val)) { // 过滤非标量数据
$value[] = $val;
}
}
$values[] = '('.implode(',', $value).')';
}
$sql = ($replace?'REPLACE':'INSERT').' INTO '.$this->parseTable($options['table']).' ('.implode(',', $fields).') VALUES '.implode(',',$values);
return $this->execute($sql);
}
/**
* 关闭数据库
* @access public
* @return void
*/
public function close() {
if ($this->_linkID){
mysql_close($this->_linkID);
}
$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() {
$this->error = mysql_error($this->_linkID);
if('' != $this->queryStr){
$this->error .= "\n [ SQL语句 ] : ".$this->queryStr;
}
\Think\Log::record($this->error,'ERR');
return $this->error;
}
/**
* SQL指令安全过滤
* @access public
* @param string $str SQL字符串
* @return string
*/
public function escapeString($str) {
if($this->_linkID) {
return mysql_real_escape_string($str,$this->_linkID);
}else{
return mysql_escape_string($str);
}
}
/**
* 字段和表名处理添加`
* @access protected
* @param string $key
* @return string
*/
protected function parseKey(&$key) {
$key = trim($key);
if(!preg_match('/[,\'\"\*\(\)`.\s]/',$key)) {
$key = '`'.$key.'`';
}
return $key;
}
}