基本查詢

select

檢索表中的所有行

$users = DB::table('users')->get();

從表檢索單個行(name = lilei)

$user = DB::table('users')->where('name', 'lilei')->first();

檢索單個列的行(查詢出 name = lilei 的 id)

$name = DB::table('users')->where('name','lilei')->pluck('id');

檢索一個列值列表(單獨查詢這一列)

$roles = DB::table('roles')->lists('title');

該方法將返回一個數組標題即為 title。你也可以指定一個自定義的鍵列返回的數組

$roles = DB::table('roles')->lists('title', 'name');

指定一個Select子句進行查詢

$users = DB::table('users')->select('name', 'email')->get();
$users = DB::table('users')->distinct()->get();
$users = DB::table('users')->select('name as user_name')->get();

Select子句添加到一個現有的查詢 $query = DB::table('users')->select('name');

$users = $query->addSelect('age')->get();

where

$users = DB::table('users')->where('votes', '>', 100)->get();

OR

$users = DB::table('users')->where('votes', '>', 100)->orWhere('name', 'John')->get();

Where Between

$users = DB::table('users')->whereBetween('votes', array(1, 100))->get();

Where Not Between

$users = DB::table('users')->whereNotBetween('votes', array(1, 100))->get();

Where In With An Array

$users = DB::table('users')->whereIn('id', array(1, 2, 3))->get();
$users = DB::table('users')->whereNotIn('id', array(1, 2, 3))->get();

Using Where Null To Find Records With Unset Values

$users = DB::table('users')->whereNull('updated_at')->get();

Order By, Group By, And Having

$users = DB::table('users')->orderBy('name', 'desc')->groupBy('count')->having('count', '>', 100)->get();

Offset & Limit

$users = DB::table('users')->skip(10)->take(5)->get();

Joins 連接

查詢構建器也可以用來編寫連接語句。

Basic Join Statement

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();

左連接語句

DB::table('users')
 ->leftJoin('posts', 'users.id', '=', 'posts.user_id')
 ->get();
DB::table('users')
 ->join('contacts', function($join) {
   $join->on('users.id', '=', 'contacts.user_id')->orOn(...);
 })
 ->get();
DB::table('users')
 ->join('contacts', function($join) {
   $join->on('users.id', '=', 'contacts.user_id')
   ->where('contacts.user_id', '>', 5);
 })
 ->get();

分組

有時候, 您可能需要創(chuàng)建更高級的where子句, 如“存在”或嵌套參數分組。Laravel query builder可以處理這些:

DB::table('users')
 ->where('name', '=', 'John')
 ->orWhere(function($query) {
   $query->where('votes', '>', 100)
   ->where('title', '<>', 'Admin');
 })
 ->get();

上面的查詢將產生以下SQL:

select * from users where name = 'John' or (votes > 100 and title <> 'Admin')
 Exists Statements
 DB::table('users')
 ->whereExists(function($query) {
   $query->select(DB::raw(1))
   ->from('orders')
   ->whereRaw('orders.user_id = users.id');
 })
 ->get();

上面的查詢將產生以下SQL:

select * from users where exists (
 select 1 from orders where orders.user_id = users.id
)

聚合

查詢構建器還提供了各種聚合方法,如統(tǒng)計,馬克斯,min,avg和總和。

Using Aggregate Methods

$users = DB::table('users')->count();
$price = DB::table('orders')->max('price');
$price = DB::table('orders')->min('price');
$price = DB::table('orders')->avg('price');
$total = DB::table('users')->sum('votes');

Raw Expressions

有時您可能需要使用一個原始表達式的查詢。這些表達式將注入的查詢字符串,所以小心不要創(chuàng)建任何SQL注入點!創(chuàng)建一個原始表達式,可以使用DB:rawmethod:

Using A Raw Expression

$users = DB::table('users')
 ->select( DB::raw('count(*) as user_count, status') )
 ->where('status', '<>', 1)
 ->groupBy('status')
 ->get();

遞增或遞減一個列的值

DB::table('users')->increment('votes');
DB::table('users')->increment('votes', 5);
DB::table('users')->decrement('votes');
DB::table('users')->decrement('votes', 5);

您還可以指定額外的列更新:

DB::table('users')->increment('votes', 1, array('name' => 'lilei'));