How does Laravel operate the database? Three ways to operate Laravel database (code)

<?php 
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;class StudentController extends Controller {
 
}

    $bool=DB::update('update vipinfo set vip_fenshu= ? where vip_ID= ? ',[700,5]);
    var_dump($bool);  //更新成功返回true

    $num=DB::delete('delete from vipinfo where vip_ID= ?',[5]);
    echo $num;

    $bool=DB::table("vipinfo")->insert(['vip_ID'=>6,'vip_name'=>'zls','vip_type'=>"出行",'vip_fenshu'=>800]);
    echo $bool; //返回bool值
    //如果想得到新增的id，则使用insertGetId方法
    $id=DB::table("vipinfo")->insertGetId(['vip_ID'=>5,'vip_name'=>'wyp','vip_type'=>"出行",'vip_fenshu'=>800]);
    echo $id;
    //插入多条数据
    $bool=DB::table("vipinfo")->insert([
    ['vip_ID'=>5,'vip_name'=>'wyp','vip_type'=>"出行",'vip_fenshu'=>800],
    ['vip_ID'=>6,'vip_name'=>'zls','vip_type'=>"出行",'vip_fenshu'=>800],
    ]);
    echo $bool; //返回bool值

$bool=DB::table("vipinfo")->where('vip_ID',6)->update(['vip_fenshu'=>500]);
echo $bool;
//自增
$bool=DB::table("vipinfo")->where('vip_ID',6)->increment("vip_fenshu");//自增1
$bool=DB::table("vipinfo")->where('vip_ID',6)->increment("vip_fenshu",3);//自增3
echo $bool;
//自减
$bool=DB::table("vipinfo")->where('vip_ID',6)->decrement("vip_fenshu");//自1
$bool=DB::table("vipinfo")->where('vip_ID',6)->decrement("vip_fenshu",3);//自增3
echo $bool;
//自增时再修改其他字段
$bool=DB::table("vipinfo")->where('vip_ID',6)->increment("vip_fenshu",3,['vip_name'=>'dbdibi']);//自增3

$num=DB::table("vipinfo")->where('vip_ID',6)->delete();//删除1条
$num=DB::table("vipinfo")->where('vip_ID','>',4)->delete();//删除多条
echo $num;  //删除的行数
$num=DB::table("vipinfo")->truncate();//删除整表，不能恢复，谨慎使用

//get()返回多条数据
$student=DB::table("vipinfo")->get();
 var_dump($student);  
//first()返回1条数据
$student=DB::table("vipinfo")->first();  //结果集第一条记录
$student=DB::table("vipinfo")->orderBy('vip_ID','desc')->first();//按vip_ID倒序排序
var_dump($student);  
//where()条件查询
$student=DB::table("vipinfo")->where('vip_ID','>=',2)->get(); //一个条件   
$student=DB::table("vipinfo")->whereRaw('vip_ID> ? and vip_fenshu >= ?',[2,300])->get(); //多个条件
dd($student);
//pluck()指定字段,后面不加get
$student=DB::table("vipinfo")->pluck('vip_name');
dd($student);
//lists()指定字段，可以指定某个字段作为下标
$student=DB::table("vipinfo")->lists('vip_name','vip_ID');   //指定vip_ID为下标
dd($student);
$student=DB::table("vipinfo")->lists('vip_name');   //不指定下标，默认下标从0开始
//select()指定某个字段
$student=DB::table("vipinfo")->select('vip_name','vip_ID')->get();
dd($student);
//chunk()每次查n条
$student=DB::table("vipinfo")->chunk(2,function($students){  //每次查2条
    var_dump($students);
    if(.......) return false;  //在满足某个条件下使用return就不会再往下查了
});

//count()统计记录条数$nums=DB::table("vipinfo")->count();
echo $nums;//max()某个字段的最大值,同理min是最小值$max=DB::table("vipinfo")->max("vip_fenshu");
echo $max;//avg()某个字段的平均值$avg=DB::table("vipinfo")->avg("vip_fenshu");
echo $avg;//sum()某个字段的和$sum=DB::table("vipinfo")->sum("vip_fenshu");
echo $sum;

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Student extends Model{
    //指定表名
protected $table= &#39;vipinfo&#39;;
//指定主键
protected $primaryKey= &#39;vip_ID&#39;;
}

public function test3(){// all()方法查询所有数据$studnets=Student::all();
dd($studnets);//find()查询一条，依据主键查询。findOrFail()查找不存在的记录时会抛出异常
$student=Student::find(5);  //主键为5的记录
var_dump($student['attributes']);//查询构造器的使用,省略了指定表名
$student=Student::get();  
var_dump($student);
}

    protected function getDateFormat(){    
    return time();
    }

    $student=new Student();    //设定数据
    $student->vip_name='xiaoming';
    $student->vip_type='出行';
    $student->vip_fenshu=900;
    $bool=$student->save(); //保存
    echo $bool;

    protected function asDateTime($val){    
    return $val;
    }

protected $fillable=['vip_name','vip_fenshu','vip_type'];   //允许批量赋值的字段

Student::create(['vip_name'=>'mmm','vip_fenshu'=>999,'vip_type'=>'出行']);

    $student=Student::firstOrCreate(['vip_name'=>'mmm']);
    echo $student;

    $student=Student::firstOrNew(['vip_name'=>'mmm']);
    $student->save();
    echo $student;

    //通过模型更新数据
    $student=Student::find(2);
    $student->vip_fenshu=10000;
    $student->save(); //返回bool值
    //通过查询构造器更新
    $num=Student::where('vip_ID','>',2)->update(['vip_fenshu'=>2000]);
    echo $num; //返回更新的行数

    //(1)通过模型删除数据
    $student=Student::find(11);
    $student->delete(); //返回bool值
    //(2)通过主键删除
    $num=Student::destroy(10); //删除主键为10的一条记录
    echo $num; //返回删除的行数
    $num=Student::destroy(10,5); //删除多条 或者$num=Student::destroy([10,5]);
    echo $num; //返回删除的行数