laravel多条件模糊查询

1.运用cmd在项目根目录下创建路由组

php artisan make:controller queryController --resource

1.1数据库信息（student）

CREATE TABLE `student` (
  `id` int() NOT NULL AUTO_INCREMENT,
  `name` varchar() NOT NULL,
  `age` tinyint() unsigned NOT NULL,
  `sex` tinyint() unsigned NOT NULL,
  `created_at` int() NOT NULL,
  `updated_at` int() NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT= DEFAULT CHARSET=utf8;

2.路由组信息如下

　　

3.编写路由组中的 index和store方法（1是显示首页，2是模糊查询）运用的是orWhere();添加多条件查询

 <?php

 namespace App\Http\Controllers;

 use Illuminate\Http\Request;
 use think\View;

 class queryController extends Controller
 {
     /**
      * Display a listing of the resource.
      *
      * @return \Illuminate\Http\Response
      */
     public function index()
     {
         //显示查询界面
         $data = \DB::table('student')->get();
         return view('query', compact('data'));
     }

     /**
      * Show the form for creating a new resource.
      *
      * @return \Illuminate\Http\Response
      */
     public function create()
     {
         echo '创建';
     }

     /**
      * Store a newly created resource in storage.
      *
      * @param  \Illuminate\Http\Request $request
      * @return \Illuminate\Http\Response
      */
     public function store(Request $request)
     {
         //返回请求结果界面
         $input = $request->get('key');
         $data  = \DB::table('student')->where('id', 'like', '%' . $input . '%')
             ->orWhere('name', 'like', '%' . $input . '%')->orWhere('age', 'like', '%' . $input . '%')->get();
            if(!is_null($data)){
                return view('query', compact('data'));
            }else{
                return back()->with(['info'=>'查询为空']);
            }
     }

     /**
      * Display the specified resource.
      *
      * @param  int $id
      * @return \Illuminate\Http\Response
      */
     public function show($id)
     {
         //
     }

     /**
      * Show the form for editing the specified resource.
      *
      * @param  int $id
      * @return \Illuminate\Http\Response
      */
     public function edit($id)
     {
         //
     }

     /**
      * Update the specified resource in storage.
      *
      * @param  \Illuminate\Http\Request $request
      * @param  int $id
      * @return \Illuminate\Http\Response
      */
     public function update(Request $request, $id)
     {
         //
     }

     /**
      * Remove the specified resource from storage.
      *
      * @param  int $id
      * @return \Illuminate\Http\Response
      */
     public function destroy($id)
     {
         //
     }
 }

多条件模糊查询

4.视图层代码

 <!doctype html>
 <html lang="en">
 <head style="background-color: lightpink">
     <meta charset="UTF-8">
     <meta name="viewport"
           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
     <meta http-equiv="X-UA-Compatible" content="ie=edge">
     <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
     </script>
     <title>多条件模糊查询</title>
 </head>
 <body>
 <form action="{{route('query.store')}}" method="post">
     {{@csrf_field()}}
     <input type="text"size="20px" name="key" placeholder="请输入id,用户名，年龄其一">
     <input type="submit" value="搜索" >
 </form>

 <table border="1px solid" cellspacing="0" cellpadding="0"style=" margin-top: 50px;width: auto;">
 <tr>
     <th>id</th>
     <th>用户名</th>
     <th>年龄</th>
     <th>性别</th>
     <th>创建时间</th>
     <th>更新时间</th>
 </tr>
         @foreach($data as $values)
             <tr>
                 <td>{{$values->id}}</td>
                 <td>{{$values->name}}</td>
                 <td>{{$values->age}}</td>
                 <td>
                     @if(($values->sex==1))男
                     @else女
                     @endif
                 </td>

                 <td>{{date('Y-m-d H:i:s',$values->created_at)}}</td>
                 <td>{{date('Y-m-d H:i:s',$values->updated_at)}}</td>
             </tr>
         @endforeach
 </table>
 </body>

 </html>

视图层

5.个人总结

1.模板中post提交的时候注意  {{@csrf_field()}} 不要忘记了

2.想起了三种定位路由的方式 2.1 {{action('你的路由action')}}  {{url('')}} {{route()}}

3.判断数据库信息返回是否为空：is_null(); empty()