Elgg  Version 4.x
GroupByClause.php
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1 <?php
2 
3 namespace Elgg\Database\Clauses;
4 
5 use Closure;
8 
12 class GroupByClause extends Clause {
13 
17  public $expr;
18 
24  public function __construct($expr) {
25  $this->expr = $expr;
26  }
27 
31  public function prepare(QueryBuilder $qb, $table_alias = null) {
32  $group_by = $this->expr;
33 
34  if ($this->isCallable($group_by)) {
35  $group_by = $this->call($group_by, $qb, $table_alias);
36  }
37 
38  if ($group_by instanceof CompositeExpression || is_string($group_by)) {
39  $qb->addGroupBy($group_by);
40  }
41  }
42 }
call($callback, QueryBuilder $qb, $table_alias=null)
Call the expression for the clause.
Definition: Clause.php:48
Interface that allows resolving statements and/or extending query builder.
Definition: Clause.php:14
Database abstraction query builder.
Extends QueryBuilder with GROUP BY statements.
isCallable($callback)
Check if a clause expression is callable.
Definition: Clause.php:35
prepare(QueryBuilder $qb, $table_alias=null)
{}
$qb
Definition: queue.php:11