The WHERE clause, if given, indicates the condition or conditions that the records must satisfy to be selected. Doctrine_Query provides easy to use WHERE -part management methods where and addWhere. The where methods always overrides the query WHERE -part whereas addWhere adds new condition to the WHERE -part stack.
from('Group')->where('Group.id > 10'); // the same query using Doctrine_Expression component \$e = \$q->expr; \$coll = \$q->from('Group')->where(\$e->gt('Group.id', 10)); ?>"); ?>

Using regular expression operator:

query(\"FROM User WHERE User.name REGEXP '[ad]'\"); ?>"); ?>

DQL has support for portable LIKE operator:

select('u.*, e.*') ->from('User u LEFT JOIN u.Email e LEFT JOIN u.Phonenumber p') ->where(\"p.phonenumber LIKE '123%'\"); ?>"); ?>

Using multiple conditions and condition nesting are also possible:

select('u.*') ->from('User u LEFT JOIN u.Email e') ->where(\"u.name LIKE '%Jack%' AND e.address LIKE '%@drinkmore.info'\"); // nesting conditions \$coll = \$q->select('u.*') ->from('User u LEFT JOIN u.Email e') ->where(\"u.name LIKE '%Jack%' OR u.name LIKE '%John%') AND e.address LIKE '%@drinkmore.info'\"); ?>"); ?>