后端模块-管理员登录、显示留言列表

1、今日完成任务：

（1）管理员登录

（2）显示留言列表

2、核心代码

数据库：

-- 创建数据库   BusSystem
drop database if exists BusSystem;
create database BusSystem;
use BusSystem;
-- 创建用户表
drop table if exists UserInfo;
create table UserInfo(
userId int not null PRIMARY key auto_increment,
userTel char(11) not null,
userPass char(8) not null,
nickname varchar(10),
regTime datetime
);
-- 留言表
drop table if exists LeftMessage;
create table LeftMessage(
id int not null PRIMARY key auto_increment,
userId int not null references UserInfo(userId),
content varchar(200),
leftTime datetime
);
-- 管理员表
drop table if exists admin;
create table admin(
id int not null PRIMARY key auto_increment,
adminNo int not null,-- 工号
adminPass varchar(8) not null,
adminName varchar(8)
);
-- 添加输入
insert into admin (adminNo,adminPass,adminName) values(001,'123456','admin');
insert into admin (adminNo,adminPass,adminName) values(002,'123456','root');
select * from admin where adminName="admin" and adminPass="123456";
select * from admin where adminName="root" and adminPass="123456";

--  添加用户
select * from UserInfo;
insert into UserInfo (userTel,userPass,nickname) values('13678909876','123456','nick');
--  添加留言
select * from LeftMessage , userinfo where leftmessage.userId=userinfo.userId;
insert into LeftMessage (userId,content,leftTime) values(1,"写什么呢",NOW());

后台代码：

<?php
//开启session
session_start();
//引入数据库操作方法文件
require_once '../function.php';
//用户登录
if(isset($_POST["username"])){
    $username=$_POST["username"];
    $pwd=$_POST["pwd"];
    $sql="select * from admin where adminName='$username' and adminPass='$pwd';";
    $rows=sel($sql);
    if($rows){
        //echo "登录成功";
        //把登录信息存储到session
        $_SESSION["username"]=$username;
        $_SESSION["pwd"]=$pwd;
        $autoValue=$_POST["online"];
        
        //保存登录  默认保存7天
        if($autoValue=="yes"){
            setcookie("auto",1,time()+60*60*24*7);//存储7天
        }
        header("location:index.php");
    }else{
        //echo "登录失败";
        header("location:login.html");
    }
}




?>

<?php foreach ($rows as $key=>$value){ ?>
                <tr class="text-c">
                    <td><input type="checkbox" value="1" name=""></td>
                    <td><?php echo $rows[$key]["userId"] ?></td>
                    <td><a href="javascript:;"><i class="avatar size-L radius" style="line-height:40px;"><?php echo $rows[$key]["nickname"] ?></i></a></td>
                    <td class="text-l">
                        <div class="f-12 c-999"><?php echo $rows[$key]["content"] ?></div>
                        <div class="c-999 f-12">
                            <time datetime="<?php echo $rows[$key]["leftTime"] ?>"><?php echo $rows[$key]["leftTime"] ?></time>
                        </div>
                    </td>
                    <td class="td-manage"><a title="编辑" href="javascript:;" onclick="member_edit('编辑','member-add.html','4','','510')" style="text-decoration:none"><i class="Hui-iconfont">&#xe6df;</i></a> <a title="删除" href="javascript:;" onclick="member_del(this,'1')" class="ml-5" style="text-decoration:none"><i class="Hui-iconfont">&#xe6e2;</i></a></td>
                </tr>
            <?php }?>