<?php
    class db  {
        function __construct() {
            $this->db = new PDO('sqlite:' . dirname(__FILE__) . '/database.db');
            $this->init_tab();
        }
        // 初始化数据库结构
        function init_tab() {
            // 网址表
            $this->db->exec("CREATE TABLE urls(id char(8) PRIMARY KEY, url longtext, ip varchar(16), ua varchar(255))");
        }
        // 查询表内容
        function query($name, $rule = '') {
            $query = $this->db->prepare("SELECT * FROM $name $rule");
            $query->execute();
            $result = $query->fetchAll();
            return $result;
        }
        // 插入表内容
        function insert($tab, $key, $val) {
            $exec = $this->db->exec("INSERT INTO $tab ($key) VALUES($val)");
            if(!$exec) return false;
            $this->db->beginTransaction();
        }
        // 删除表内容
        function delete($tab, $rule = '') {
            $exec = $this->db->exec("DELETE FROM $tab $rule");
            if(!$exec) return false;
            $this->db->beginTransaction();
        }
    }
?>