PHP基于PDO实现的SQLite操作类【包含增删改查及事务等操作】

<?php// sqlite分页类class SqliteDB{  public function __construct(){    // 初始化数据库，并且连接数据库 数据库配置    $this->db = new PDO('sqlite:'.dirname(__FILE__).'/log.db');    $this->table_name=$tab;    $this->tab_init();  }  public function tab_init()  {    # 表初始化,创建表    $this->db->exec("CREATE TABLE log(      id integer PRIMARY KEY autoincrement,      urls varchar(200),      ip varchar(200),      datetimes datetime default (datetime('now', 'localtime'))      )");  }  public function insert($tab_name,$key_list,$value_list)  {    // echo "INSERT INTO ".$tab_name." (".$key_list.") values(".$value_list.")";    $result=$this->db->exec("INSERT INTO ".$tab_name." (".$key_list.") values(".$value_list.")");    if (!$result) {      return false;    }    // echo "{{{INSERT INTO ".$tab_name." (".$key_list.") values(".$value_list.")}}}}";    $res=$this->db->beginTransaction();//事务回gun  }  public function total($tab_name,$tj='')//求总记录数目  {    $sth = $this->db->prepare('SELECT count(id) as c FROM '.$tab_name.' '.$tj);    $sth->execute();    $result = $sth->fetchAll();    return $result[0]['c'];  }  public function update()  {    # 修改  }  function delete($value='')  {    # 删除  }  public function query($tab_name,$tj='')//表名称和条件  {    $sth = $this->db->prepare('SELECT * FROM '.$tab_name.' '.$tj);    // echo 'SELECT * FROM '.$tab_name.' '.$tj;    $sth->execute();    $result = $sth->fetchAll();    return $result;  }}// $db=new SqliteDB();// $res=$db->insert('log','ip,urls,datetimes','"127.0.0.1","www.baidu.com","2012-12-12 00:00:00"');//添加案例// $res=$db->query('log');//查询案例// $res=$db->total('log');//查询案例// print_r($res);// foreach ($res as $key => $row) {// echo $row['urls'];// }?>