Laravel框架查询构造器 CURD操作示例

//插入一条数据public function insert(){  $rs = DB::table('student')->insert([    'name' => 'Kit',    'age' => 12  ]);  dd($rs);  //true}

//插入一条数据并返回自增IDpublic function insert(){  $id = DB::table('student')->insertGetId([    'name'=>'Tom',    'age'=>11  ]);  dd($id);  //1004}

//插入多条数据public function insert(){  $rs = DB::table('student')->insert([    ['name'=>'Ben','age'=>22],    ['name'=>'Jean','age'=>23]  ]);  dd($rs);//true}

//更新一条数据public function update(){  $rs = DB::table('student')    ->where('id',1003)    ->update(['age'=>10]);  dd($rs);//1，返回受影响的行数}

//自增更新public function update(){  //所有年龄加1  $rs = DB::table('student')->increment('age');  dd($rs);//5，返回受影响的行数  //ID为1001的年龄加3  $rs = DB::table('student')    ->where('id',1001)    ->increment('age',3);  dd($rs);//1，返回受影响的行数}

//自减更新public function update(){  //所有年龄加1  $rs = DB::table('student')->decrement('age');  dd($rs);//5，返回受影响的行数  //ID为1001的年龄加3  $rs = DB::table('student')    ->where('id',1001)    ->decrement('age',3);  dd($rs);//1，返回受影响的行数}

//1001年龄加3并且性别改为11public function update(){  $rs = DB::table('student')    ->where('id',1001)    ->increment('age',3,['sex'=>11]);  dd($rs);//1，返回受影响的行数}

//删除ID为1006的数据public function delete(){  $rs = DB::table('student')    ->where('id',1006)    ->delete();  dd($rs);//1，返回受影响的行数}

//删除ID大于1003的数据public function delete(){  $rs = DB::table('student')    ->where('id','>',1003)    ->delete();  dd($rs);//2，返回受影响的行数}

//清空数据表，不返回任何东西DB::table('student')->truncate();

//查询所有数据$rs = DB::table('student')->get();

//查询第一条数据$rs = DB::table('student')->orderBy('id','desc')->first();

//查询一个name字段$rs = DB::table('student')->pluck('name');//查询name字段并以ID为键名$rs = DB::table('student')->pluck('name','id');

//查询name，age，sex字段$rs = DB::table('student')->select('name','age','sex')->get();

$rs = DB::table('student')->count();$rs = DB::table('student')->max('age');$rs = DB::table('student')->min('age');$rs = DB::table('student')->avg('age');$rs = DB::table('student')->sum('age');