PHP SQLite类

<?
/**
* SQLite类
* 2009-5-6
* 连万春
*
*/
class SQLite {
    // 当前SQL指令
    public $_mQueryStr = '';
    // 当前结果
    public $_mResult = null;
    // SQLite连接句柄
    protected $_mSqlite;
    // 警告信息
    protected $_mErrorInfo;
    /**
     * 数据库连接 构造类
     *
     * @param string $databaseFile 数据库文件
     * @return unknown
     */
    public function __construct($databaseFile){
        if(file_exists($databaseFile)){
            $this->_mSqlite = new PDO('sqlite:'.$databaseFile);
        }else{
            $this->_mErrorInfo="未找到数据库文件";
            return false;
        }
    }
    /**
     * 数据库有返回结果的语句操作
     *
     * @param srting $sql SQL语句
     * @return unknown
     */
    public function getAll($sql){
        if (empty($sql)) {
            $this->_mErrorInfo="SQL语句错误";
            return false;
        }
        $result=$this->_mSqlite->prepare($sql);
        if ( false === $result) {
            return array();
        }
        $result->execute();
        $this->_mResult = $result->fetchAll();
        if ( false === $this->_mResult) {
            return array();
        }
        return $this->_mResult;
    }
    /**
     * 执行INSERT,DELETE,UPDATA操作
     *
     * @param srting $sql SQL语句
     * @return unknown
     */
    public function query($sql){
        if (empty($sql)) {
            $this->_mErrorInfo="SQL语句错误";
            return false;
        }
        //$this->_mSqlite->exec($sql)or die(print_r($this->_mSqlite->errorInfo()));
        $this->_mSqlite->exec($sql);
        return true;
    }
    /**
     * 返回错误信息
     *
     * @return unknown
     */
    public function setError(){
        return $this->_mErrorInfo;
    }
}
?>