DB::connection('connection_name');// 运行数据库查询语句$results=DB::select('select * from users where id = ?',[1]);$results=DB::select('select * from users where id = :id',['id'=>1]);// 运行普通语句DB::statement('drop table users');// 监听查询事件DB::listen(function($sql,$bindings,$time){ code_here;});// 数据库事务处理DB::transaction(function(){DB::table('users')->update(['votes'=>1]);DB::table('posts')->delete();});DB::beginTransaction();DB::rollBack();DB::commit();// 获取表前缀DB::getTablePrefix()
查询语句构造器
// 取得数据表的所有行DB::table('name')->get();// 取数据表的部分数据DB::table('users')->chunk(100,function($users){foreach($usersas$user){//}});// 取回数据表的第一条数据$user=DB::table('users')->where('name','John')->first();DB::table('name')->first();// 从单行中取出单列数据$name=DB::table('users')->where('name','John')->pluck('name');DB::table('name')->pluck('column');// 取多行数据的「列数据」数组$roles=DB::table('roles')->lists('title');$roles=DB::table('roles')->lists('title','name');// 指定一个选择字段$users=DB::table('users')->select('name','email')->get();$users=DB::table('users')->distinct()->get();$users=DB::table('users')->select('name as user_name')->get();// 添加一个选择字段到一个已存在的查询语句中$query=DB::table('users')->select('name');$users=$query->addSelect('age')->get();// 使用 Where 运算符$users=DB::table('users')->where('votes','>',100)->get();$users=DB::table('users')->where('votes','>',100)->orWhere('name','John')->get();$users=DB::table('users')->whereBetween('votes',[1,100])->get();$users=DB::table('users')->whereNotBetween('votes',[1,100])->get();$users=DB::table('users')->whereIn('id',[1,2,3])->get();$users=DB::table('users')->whereNotIn('id',[1,2,3])->get();$users=DB::table('users')->whereNull('updated_at')->get();DB::table('name')->whereNotNull('column')->get();// 动态的 Where 字段$admin=DB::table('users')->whereId(1)->first();$john=DB::table('users')->whereIdAndEmail(2,'john@doe.com')->first();$jane=DB::table('users')->whereNameOrAge('Jane',22)->first();// Order By, Group By, 和 Having$users=DB::table('users')->orderBy('name','desc')->groupBy('count')->having('count','>',100)->get();DB::table('name')->orderBy('column')->get();DB::table('name')->orderBy('column','desc')->get();DB::table('name')->having('count','>',100)->get();// 偏移 & 限制$users=DB::table('users')->skip(10)->take(5)->get();
Joins
// 基本的 Join 声明语句DB::table('users')->join('contacts','users.id','=','contacts.user_id')->join('orders','users.id','=','orders.user_id')->select('users.id','contacts.phone','orders.price')->get();// Left Join 声明语句DB::table('users')->leftJoin('posts','users.id','=','posts.user_id')->get();// select * from users where name = 'John' or (votes > 100 and title <> 'Admin')DB::table('users')->where('name','=','John')->orWhere(function($query){$query->where('votes','>',100)->where('title','<>','Admin');})->get();
$users=DB::table('users')->select(DB::raw('count(*) as user_count, status'))->where('status','<>',1)->groupBy('status')->get();// 返回行DB::select('select * from users where id = ?',array('value'));DB::insert('insert into foo set bar=2');DB::update('update foo set bar=2');DB::delete('delete from bar');// 返回 voidDB::statement('update foo set bar=2');// 在声明语句中加入原始的表达式DB::table('name')->select(DB::raw('count(*) as count, column2'))->get();
Laravel 速查表
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