Question

What points should be kept in mind while writing queries as under?

$sql=” And two=2″;

$sql.=” And three=3″;

$sqlquery=”select * from”.$sql;

I want to make complex queries like the example

Answer 1

You’d better add where 1=1 into your main query. This way you could or could not have any number of AND-joined conditions.

Like this:

$base_query = 'select * from table where 1=1';
$base_query.= 'and two = 2';
$base_query = 'and three = 3';

UPDATE: Doctrine ORM style quering:

//$em is instance of EntityManager
$qb = $em->createQueryBuilder();
$qb->select('u')
  ->from('User', 'u')
  ->where('u.id = ?1')
  ->orderBy('u.name ASC');

//you could add any part of query later
$qb->andWhere("u.name = 'John'");

$query = $qb->getQuery();
$result = $query->getResult();