renamed member properties to reflect new class name.
added dbConnect to serialize; what if pdo is an array; added more comments.
removed building sql. should be done in DbAccess.
removed test since Query does not throw Exception any more.
added more comments.
renamed w method to col, a bit more descriptive name.
removed unused $sql; removed completed todo.
use SqlBuilder object in DbAccess and changed instantiation script.
ready for injecting queryObject.
prepared for config given in DbConnect (as will happen in DiContainer).
added a test to make sure prpoer step works.
keep the used config for db connection.
updated some comments.
created query.php scripts to construct Query object.
Query object can connect to a database.
use the new query scripts to construct Query object. and use the connect method.
moved db connection to setUpBeforeClass to suppress PgSql's error.
keep the dbConnect and recreate DbAccess for each test.
refactored pdo to dbAccess (right name).
some usage of Query added.