Elgg  Version 3.0
SelectClause.php
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1 <?php
2 
3 namespace Elgg\Database\Clauses;
4 
5 use Closure;
8 
12 class SelectClause implements 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  $select = $this->expr;
33 
34  if ($this->expr instanceof Closure) {
35  $select = call_user_func($this->expr, $qb, $table_alias);
36  }
37 
38  if ($select instanceof CompositeExpression || is_string($select)) {
39  $qb->addSelect($select);
40  }
41  }
42 }
Extends QueryBuilder with SELECT clauses.
Database abstraction query builder.
Interface that allows resolving statements and/or extending query builder.
Definition: Clause.php:11
prepare(QueryBuilder $qb, $table_alias=null)
{Build an expression and/or apply it to an instance of query builder.Query builder Table aliasComposi...