function DatabaseSelectSubqueryTestCase::testConditionSubquerySelect

Test that we can use a subquery in a WHERE clause.

File

modules/simpletest/tests/database_test.test, line 1928

Class

DatabaseSelectSubqueryTestCase

Test case for subselects in a dynamic SELECT query.

Code

function testConditionSubquerySelect() {
    // Create a subquery, which is just a normal query object.
    $subquery = db_select('test_task', 'tt');
    $subquery->addField('tt', 'pid', 'pid');
    $subquery->condition('tt.priority', 1);
    // Create another query that joins against the virtual table resulting
    // from the subquery.
    $select = db_select('test_task', 'tt2');
    $select->addField('tt2', 'task');
    $select->condition('tt2.pid', $subquery, 'IN');
    // The resulting query should be equivalent to:
    // SELECT tt2.name
    // FROM test tt2
    // WHERE tt2.pid IN (SELECT tt.pid AS pid FROM test_task tt WHERE tt.priority=1)
    $people = $select->execute()
        ->fetchCol();
    $this->assertEqual(count($people), 5, 'Returned the correct number of rows.');
}