public function testAllTypesSelects()
{
// SQL query
$sql = 'SELECT * FROM users';
// Executes the SQL and stores the result
$result = test::select($sql);
$this->assertEquals(1, self::getNumRows($result));
// Executes the SQL and stores the result
$result_num = test::selectNum($sql);
$this->assertEquals(1, self::getNumRows($result_num));
// Executes the SQL and stores the result
$result_obj = test::selectObj($sql);
$this->assertEquals(1, self::getNumRows($result_obj));
// Executes the SQL and stores the result
$result_all = test::selectAll($sql);
$this->assertEquals(1, self::getNumRows($result_all));
}