function DatabaseSelectSubqueryTestCase::testNotExistsSubquerySelect

Test NOT EXISTS subquery conditionals on SELECT statements.

We essentially select all rows from the {test} table that don't have matching rows in the {test_people} table based on the shared name column.

File

modules/simpletest/tests/database_test.test, line 2008

Class

DatabaseSelectSubqueryTestCase

Test case for subselects in a dynamic SELECT query.

Code

function testNotExistsSubquerySelect() {
    // Put George into {test_people}.
    db_insert('test_people')->fields(array(
        'name' => 'George',
        'age' => 27,
        'job' => 'Singer',
    ))
        ->execute();
    // Base query to {test}.
    $query = db_select('test', 't')->fields('t', array(
        'name',
    ));
    // Subquery to {test_people}.
    $subquery = db_select('test_people', 'tp')->fields('tp', array(
        'name',
    ))
        ->where('tp.name = t.name');
    $query->notExists($subquery);
    // Ensure that we got the right number of records.
    $people = $query->execute()
        ->fetchCol();
    $this->assertEqual(count($people), 3, 'NOT EXISTS query returned the correct results.');
}