laravel-5

Database: Query Builder 407
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1 $users = DB::table('users')
2 ->whereNull('updated_at')
3 ->get();
The whereNotNull method verifies that the column’s value is not NULL:
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1 $users = DB::table('users')
2 ->whereNotNull('updated_at')
3 ->get();
Advanced Where Clauses
Parameter Grouping
Sometimes you may need to create more advanced where clauses such as “where exists” or nested
parameter groupings. The Laravel query builder can handle these as well. To get started, let’s look
at an example of grouping constraints within parenthesis:
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1 DB::table('users')
2 ->where('name', '=', 'John')
3 ->orWhere(function ($query) {
4 $query->where('votes', '>', 100)
5 ->where('title', '', 'Admin');
6 })
7 ->get();
As you can see, passing Closure into the orWhere method instructs the query builder to begin a
constraint group. The Closure will receive a query builder instance which you can use to set the
constraints that should be contained within the parenthesis group. The example above will produce
the following SQL:
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1 select * from users where name = 'John' or (votes > 100 and title 'Admin')