Python Data Access Layer Generator

Update: SQL injection fix

As some people noticed the previuos version that used to format sql parameters right into the generated string allowed potential attackers for sql injection. This is fixed by using variables symbols (?) and letting the python database API to properly format and escape the sql string.

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If you are bored to write the data access layer from scratch for every table in your database and you don’t want include more dependencies in your proyect (like SQLAlquemy, Elixir, Django-ORM, SQLObjects) here’s the solution!

This piece of code is a Data Layer SQL Generator for your Data Table Objects (DTOs). It provides the SQL statments to the basic operations in the database.

It’s very simple to use:

from mapper import ObjectMapper

class Person(object):

    def __init__(self):

        self.name = 'john'
        self.age = 22

        #this properties are ignored
        self._some_information = 'Not saved in table'
        self.__other_stuff = 'Also ignored'

p = Person()
m = ObjectMapper(p)

>>> m.insert()
("INSERT INTO person(age,name) VALUES ('?','?')", '22', 'john')
>>> m.update(id=1)
("UPDATE person SET age = '?', name = '?' WHERE id_person = ?", '22', 'john', 1)
>>> m.delete(id=1)
('DELETE FROM person WHERE id_person = ?', 1)
>>> m.get_all()
"SELECT age, name FROM person"
>>> m.get_by_id(id=1)
('SELECT age, name FROM person WHERE id_person = ?', 1)

And forget about writting the repetitive SQL Layer for your tables!