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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: DbSqlite.class.php 2729 2012-02-12 04:13:34Z liu21st $
/**
+-------------------------------
* Sqlite数据库驱动类
+-------------------------------
*/
class DbSqlite 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('sqlite') ) {
throw_exception(L('_NOT_SUPPERT_').':sqlite');
}
if(!empty($config)) {
if(!isset($config['mode'])) {
$config['mode'] = 0666;
}
$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;
$pconnect = !empty($config['params']['persist'])? $config['params']['persist']:$this->pconnect;
$conn = $pconnect ? 'sqlite_popen':'sqlite_open';
$this->linkID[$linkNum] = $conn($config['database'],$config['mode']);
if ( !$this->linkID[$linkNum]) {
throw_exception(sqlite_error_string());
}
// 标记连接成功
$this->connected = true;
//注销数据库安全信息
if(1 != C('DB_DEPLOY_TYPE')) unset($this->config);
}
return $this->linkID[$linkNum];
}
/**
+----------------------------------------------------------
* 释放查询结果
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function free() {
$this->queryID = 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 ( $this->queryID ) $this->free();
N('db_query',1);
// 记录开始执行时间
G('queryStartTime');
$this->queryID = sqlite_query($this->_linkID,$str);
$this->debug();
if ( false === $this->queryID ) {
$this->error();
return false;
} else {
$this->numRows = sqlite_num_rows($this->queryID);
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;
//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
G('queryStartTime');
$result = sqlite_exec($this->_linkID,$str);
$this->debug();
if ( false === $result ) {
$this->error();
return false;
} else {
$this->numRows = sqlite_changes($this->_linkID);
$this->lastInsID = sqlite_last_insert_rowid($this->_linkID);
return $this->numRows;
}
}
/**
+----------------------------------------------------------
* 启动事务
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return void
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function startTrans() {
$this->initConnect(true);
if ( !$this->_linkID ) return false;
//数据rollback 支持
if ($this->transTimes == 0) {
sqlite_query($this->_linkID,'BEGIN TRANSACTION');
}
$this->transTimes++;
return ;
}
/**
+----------------------------------------------------------
* 用于非自动提交状态下面的查询提交
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function commit() {
if ($this->transTimes > 0) {
$result = sqlite_query($this->_linkID,'COMMIT TRANSACTION');
if(!$result){
throw_exception($this->error());
}
$this->transTimes = 0;
}
return true;
}
/**
+----------------------------------------------------------
* 事务回滚
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function rollback() {
if ($this->transTimes > 0) {
$result = sqlite_query($this->_linkID,'ROLLBACK TRANSACTION');
if(!$result){
throw_exception($this->error());
}
$this->transTimes = 0;
}
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
$result = array();
if($this->numRows >0) {
for($i=0;$i<$this->numRows ;$i++ ){
// 返回数组集
$result[$i] = sqlite_fetch_array($this->queryID,SQLITE_ASSOC);
}
sqlite_seek($this->queryID,0);
}
return $result;
}
/**
+----------------------------------------------------------
* 取得数据表的字段信息
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return array
+----------------------------------------------------------
*/
public function getFields($tableName) {
$result = $this->query('PRAGMA table_info( '.$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='') {
$result = $this->query("SELECT name FROM sqlite_master WHERE type='table' "
. "UNION ALL SELECT name FROM sqlite_temp_master "
. "WHERE type='table' ORDER BY name");
$info = array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/**
+----------------------------------------------------------
* 关闭数据库
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function close() {
if ($this->_linkID){
sqlite_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() {
$this->error = sqlite_error_string(sqlite_last_error($this->_linkID));
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) {
return sqlite_escape_string($str);
}
/**
+----------------------------------------------------------
* limit
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
public function parseLimit($limit) {
$limitStr = '';
if(!empty($limit)) {
$limit = explode(',',$limit);
if(count($limit)>1) {
$limitStr .= ' LIMIT '.$limit[1].' OFFSET '.$limit[0].' ';
}else{
$limitStr .= ' LIMIT '.$limit[0].' ';
}
}
return $limitStr;
}
}
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