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Chapter 9: DQL

Chapter 9: DQL (Doctrine Query Language) 126 Listing 9-23 The above call to getSql() would output the following SQL query: SELECT u.id AS u__id, u.username AS u__username FROM user u LEFT JOIN phonenumber p ON u.id = p.user_id HAVING COUNT(p.id) > 3 The ORDER BY clause can be used for sorting the results Listing 9-24 // test.php // ... $q = Doctrine_Query::create() ->select('u.username') ->from('User u') ->orderBy('u.username'); echo $q->getSqlQuery(); The above call to getSql() would output the following SQL query: Listing 9-25 SELECT u.id AS u__id, u.username AS u__username FROM user u ORDER BY u.username The LIMIT and OFFSET clauses can be used for efficiently limiting the number of records to a given row_count Listing 9-26 // test.php // ... $q = Doctrine_Query::create() ->select('u.username') ->from('User u') ->limit(20); echo $q->getSqlQuery(); The above call to getSql() would output the following SQL query: Listing 9-27 SELECT u.id AS u__id, u.username AS u__username FROM user u LIMIT 20 Aggregate values Aggregate value SELECT syntax: Listing 9-28 // test.php // ... ----------------- Brought to you by

Chapter 9: DQL (Doctrine Query Language) 127 $q = Doctrine_Query::create() ->select('u.id, COUNT(t.id) AS num_threads') ->from('User u, u.Threads t') ->where('u.id = ?', 1) ->groupBy('u.id'); echo $q->getSqlQuery(); The above call to getSql() would output the following SQL query: SELECT u.id AS u__id, COUNT(f.id) AS f__0 FROM user u LEFT JOIN forum__thread f ON u.id = f.user_id WHERE u.id = ? GROUP BY u.id Listing 9-29 Now execute the query and inspect the results: // test.php Listing 9-30 // ... $users = $q->execute(); You can easily access the num_threads data with the following code: // test.php Listing 9-31 // ... echo $users->num_threads . ' threads found'; UPDATE queries UPDATE statement syntax: UPDATE SET = , = WHERE ORDER BY LIMIT Listing 9-32 • The UPDATE statement updates columns of existing records in component_name with new values and returns the number of affected records. • The SET clause indicates which columns to modify and the values they should be given. • The optional WHERE clause specifies the conditions that identify which records to update. Without WHERE clause, all records are updated. • The optional ORDER BY clause specifies the order in which the records are being updated. • The LIMIT clause places a limit on the number of records that can be updated. You can use LIMIT row_count to restrict the scope of the UPDATE. A LIMIT clause is a rows-matched restriction not a rows-changed restriction. The statement stops as soon as it has found record_count rows that satisfy the WHERE clause, whether or not they actually were changed. ----------------- Brought to you by

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