Add PostgreSQL version of SQLite integ tests

- Add PostgreSQL throwaway database
- Add optional length parameter for random string
- Fix syntax for PostgreSQL in several areas
- Add optional ID for whereById type determination

tests/unit/ParametersTest.php

@@ -51,7 +51,7 @@ class ParametersTest extends TestCase
     {
         try {
             Configuration::$mode = Mode::PgSQL;
-            $this->assertEquals([':names' => "ARRAY['one','two','seven']"],
+            $this->assertEquals([':names' => "{one,two,seven}"],
                 Parameters::fieldNames(':names', ['one', 'two', 'seven']), 'Field name parameters not correct');
         } finally {
             Configuration::$mode = null;