Test that we can use a subquery in a FROM clause with a limit.

File

modules/simpletest/tests/database_test.test, line 1902

Class

DatabaseSelectSubqueryTestCase

Test case for subselects in a dynamic SELECT query.

Code

function testFromSubquerySelectWithLimit() {
 // Create a subquery, which is just a normal query object.
 $subquery = db_select ('test_task', 'tt');
 $subquery->addField ('tt', 'pid', 'pid');
 $subquery->addField ('tt', 'task', 'task');
 $subquery->orderBy ('priority', 'DESC');
 $subquery->range (0, 1);
 // Create another query that joins against the virtual table resulting
 // from the subquery.
 $select = db_select ($subquery, 'tt2');
 $select->join ('test', 't', 't.id=tt2.pid');
 $select->addField ('t', 'name');
 // The resulting query should be equivalent to:
 // SELECT t.name
 // FROM (SELECT tt.pid AS pid, tt.task AS task FROM test_task tt ORDER BY priority DESC LIMIT 1 OFFSET 0) tt
 // INNER JOIN test t ON t.id=tt.pid
 $people = $select->execute ()
 ->fetchCol ();
 $this->assertEqual (count ($people), 1, 'Returned the correct number of rows.');
}

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