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综合实战第三课:laravel基础2-PHP培训九期线上班
渡劫小能手
Original
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路由

必选参数

route中定义的{id}要和控制器的方法中传参的$id一致

  1. Route::get('/product/item/{id}.html','Product@detail');
  1. public function detail($id){
  2. $res = array('id'=>$id,'title'=>'荣耀10,'price'=>2000);
  3. return view('product.detail',['product'=>$res]);
  4. }

可选参数

在控制器的方法中要有个默认值

  1. Route::get('/product/item/{id?}','Product@detail');
  1. public function detail($id=2){
  2. $res = array('id'=>$id,'title'=>'荣耀10,'price'=>2000);
  3. return view('product.detail',['product'=>$res]);
  4. }

命名路由

  1. Route::get('/product/item/{id?}','Product@detail')->name('product_item');

视图blade引擎流程控制

@foreach

  1. public function detail($id=2){
  2. $res[0] = array('id'=>2,'title'=>'荣耀10,'price'=>2000);
  3. $res[1] = array('id'=>5,'title'=>'iphone11,'price'=>8000);
  4. $res[2] = array('id'=>8,'title'=>'iphone12,'price'=>18000);
  5. return view('product.detail',['product'=>$res]);
  6. }
  1. @foreach($product as $item)
  2. 商品名称:{{$item['title']}}
  3. @endforeach

@if

  1. @foreach($product as $item)
  2. @if($item['price']<3000)
  3. 商品名称:{{$item['title']}}
  4. @endif
  5. @endforeach

@else

  1. @foreach($product as $item)
  2. @if($item['price']<3000)
  3. 商品名称:{{$item['title']}}
  4. @else
  5. {{$item['title']}}买不起
  6. @endif
  7. @endforeach

@elseif

  1. @foreach($product as $item)
  2. @if($item['price']<3000)
  3. 商品名称:{{$item['title']}}
  4. @elseif($item['price']>3000 && $item['price']<10000)
  5. 买{{$item['title']}}有压力
  6. @else
  7. {{$item['title']}}买不起
  8. @endif
  9. @endforeach

@while

  1. <?php
  2. $i = 0;
  3. $count = count($product);
  4. ?>
  5. @while($i<$count)
  6. {{$product[$i]['title']}}
  7. <?php $i++;?>
  8. $endwhile

原生数据库操作

select

注意应用DB类,查询出来的是一个二维数组,返回结果集
use Illuminate\Support\Facades\DB;

  1. public function detail(){
  2. $res = DB::select('select * from product where id>?',[2]);
  3. //$res = DB::select("select * from product where id>:id",['id'=>2]);
  4. echo '<pre>';
  5. print_r($res);
  6. return view('product.detail');
  7. }

insert

返回bool值

  1. $res = DB::insert('insert into product(`pname`,`price`) values ("iphone12",20000)');

update

返回受该语句影响的行数

  1. $res = DB::update('update product set pname="荣耀10",price=3000 where id=10');

delete

返回受该语句影响的行数

  1. $res = DB::delete('delete from product where pname="iphone12"');

查询构造器

查询

只要查询的结果集是 Collection 类型,就可以在后面加toArray()方法。返回的每个数组是一个对象,从对象中取值用->

  1. echo '<pre>';
  2. $res = DB::table('product')->get()->toArray();
  3. foreach($res as $item){
  4. echo $item->pname.'<br>';
  5. }

where条件

在获取结果集之前(get()),在table之后,在这2者之间
where中2个参数默认是 =

  1. echo '<pre>';
  2. $res = DB::table('product')->where('id',2)->get()->toArray();
  3. // $res = DB::table('product')->where('id','>',2)->get()->toArray();
  4. var_dump($res);
Correcting teacher:天蓬老师天蓬老师

Correction status:qualified

Teacher's comments:数据表的操作还是非常简单的吧
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