Laravel DB Cheat Sheet

Basic Database Usage

DB::connection('connection_name');

Running A Select Query

$results = DB::select('select * from users where id = ?', [1]);
$results = DB::select('select * from users where id = :id', ['id' => 1]);

Running A General Statement

DB::statement('drop table users');

Listening For Query Events

DB::listen(function($sql, $bindings, $time){ code_here; });

Database Transactions

DB::transaction(function()
{
DB::table('users')->update(['votes' => 1]);
DB::table('posts')->delete();
});
DB::beginTransaction();
DB::rollback();
DB::commit();

Laravel Query Builder

Retrieving All Rows From A Table

DB::table('name')->get();

Chunking Results From A Table

DB::table('users')->chunk(100, function($users) {
 foreach ($users as $user) { //} 
});

Retrieving A Single Row From A Table

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

Retrieving A Single Column From A Row

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

Retrieving A List Of Column Values

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

Specifying A Select Clause

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

Adding A Select Clause To An Existing Query

$query = DB::table('users')->select('name');
$users = $query->addSelect('age')->get();

Using Where Operators

$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();

Dynamic Where Clauses

$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, And 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();

Offset & Limit

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

Laravel Joins

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();

Left Join Statement

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();

Laravel Aggregates

$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');

DB::table('name')->remember(5)->get();
DB::table('name')->remember(5, 'cache-key-name')->get();
DB::table('name')->cacheTags('my-key')->remember(5)->get();
DB::table('name')->cacheTags(array('my-first-key','my-second-key'))->remember(5)->get();

Laravel Raw Expressions 

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

return rows

DB::select('select * from users where id = ?', array('value'));

return nr affected rows

DB::insert('insert into foo set bar=2');
DB::update('update foo set bar=2');
DB::delete('delete from bar');

returns void

DB::statement('update foo set bar=2');

raw expression inside a statement

DB::table('name')->select(DB::raw('count(*) as count, column2'))->get();

Laravel Inserts / Updates / Deletes / Unions / Pessimistic Locking

Inserts

DB::table('users')->insert(
  ['email' => 'john@example.com', 'votes' => 0]
);
$id = DB::table('users')->insertGetId(
  ['email' => 'john@example.com', 'votes' => 0]
);
DB::table('users')->insert([
  ['email' => 'taylor@example.com', 'votes' => 0],
  ['email' => 'dayle@example.com', 'votes' => 0]
]);

Updates

DB::table('users')
          ->where('id', 1)
          ->update(['votes' => 1]);
DB::table('users')->increment('votes');
DB::table('users')->increment('votes', 5);
DB::table('users')->decrement('votes');
DB::table('users')->decrement('votes', 5);
DB::table('users')->increment('votes', 1, ['name' => 'John']);

Deletes

DB::table('users')->where('votes', '<', 100)->delete();
DB::table('users')->delete();
DB::table('users')->truncate();

Unions. The unionAll() method is also available, and has the same method signature as union.

$first = DB::table('users')->whereNull('first_name');
$users = DB::table('users')->whereNull('last_name')->union($first)->get();

Pessimistic Locking

DB::table('users')->where('votes', '>', 100)->sharedLock()->get();
DB::table('users')->where('votes', '>', 100)->lockForUpdate()->get();

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