php Demo

<?php

namespace app\index\controller;

define('APP_DEBUG',true);

public function login(){
   if (request()->isPost()) {
       $username = input("post.username");
       $password = input("post.password");
       if(empty($username) || empty($password)) {
           returnjson(array(2,"请输入用户名和密码",""));
       }
       $searchusers = db('users');
       $where['username'] = $username;
       $where['password'] = $password;
       $arr_id = $searchusers->where($where)->field('id')->find();
       $arr = $searchusers->where($arr_id)->find();
       if(empty($arr)){
           returnjson(array(2,'没有这条数据！',''));
       }else{
           returnjson(array(1,'success',$arr));
       }
   }
}

#数据库连接
public function connection(){
   $servername = 'localhost';
   $username = 'root';
   $password = '';
   $dbname = 'mydatabase';
   $conn = mysqli_connect($servername,$username,$password);
   // 检测连接
   if ($conn->connect_error) {
       die("连接失败: " . $conn->connect_error);
   }
   echo "连接成功";
}

#数据库连接
public function connection(){
$servername = 'localhost';
$username = 'root';
$password = '';
$dbname = 'mydatabase';
$conn = mysqli_connect($servername,$username,$password);

// 检测连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
}

#数据库新增
public function insertdata(){
   $searchusers = db('users');
   $arr = array(
       'id' => '6',
       'username' => '123',
       'password' => '123'
   );
   #插入记录
   $data = $searchusers->insert($arr);
   returnjson(array(1,'success',$data));
}

#数据新增
public function addData(){
if (request()->isPost()) {
$username = input("post.username");
$password = input("post.password");
if(empty($username) || empty($password)) {
returnjson(array(2,"新增无效!",""));
}
$searchusers = db('users');
$where['username'] = $username;
$where['password'] = $password;
//插入记录
$data = $searchusers->insert($where);
returnjson(array(1,'新增成功!',$data));
}
}

#数据库删除
public function delete(){
   $searchusers = db('users');
   $where['username'] = '123';
   $where['password'] = '123';
   $arr_id = $searchusers->where($where)->field('id')->find();
   $data = $searchusers->where($arr_id)->delete();
   returnjson(array(1,'success',$data));
}

#数据删除
public function DeleteData(){
if (request()->isPost()) {
$ucode = input("post.ucode");
if(empty($ucode)) {
returnjson(array(2,"没有取到要删除的数据标识!",""));
}
$searchusers = db('users');
$where['id'] = $ucode;
$data = $searchusers->where($where)->delete();
returnjson(array(1,'success',$data));
}
}

#数据库修改
public function updata(){
   $searchusers = db('users');
   $where['username'] = 'caac_zhangyingchun';
   $where['password'] = 'caac_zhangyingchun';
   $arr_id = $searchusers->where($where)->field('id')->find();
   $arr = array(
       'id' => '5',
       'username' => 'zhangyingchun',
       'password' => 'zhangyingchun'
   );
   $data = $searchusers->where('id='.$arr_id['id'])->update($arr);
   returnjson(array(1,'success',$data));
}

#users表全查
public function selectName(){
$searchusers = db('users');
$username = input("post.search_data");
$where['username'] = array('like',"%".$username."%");
if(empty($where['username'])) {
returnjson(array(2,"请输入用户名!",""));
}
$arr = $searchusers->where($where)->select();
if(empty($arr) || $arr == false){
returnjson(array(2,'没有这条数据！',''));
}else{
returnjson(array(1,'success',$arr));
}
}

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