Generate Python Class and SQLAlchemy code from XSD to store XML on Postgres

问题

I have some very complex XSD schemas to work with. By complex I mean that each of these XSD would correspont to about 20 classes / tables in a database, with each table having approximately 40 fields. And I have 18 different XSD like that to program.

What I'm trying to achieve is: Get a XML file defined by the XSD and save all the data in a PostgreSQL database using SQLAlchemy. Basically I need a CRUD application that will persist a XML file in the database following the model of the XSD schema, and also be able to retrieve an object from the database and create a XML file.

I want to avoid having to manually create the python classes, the sqlalchemy table definitions, the CRUD code. This would be a monumental job, subject to a lot of small mistakes, given the complexity of the XSD files.

I can generate python classes from XSD in many ways like GenerateDS, PyXB, etc... I need to save those objects in the database. I'm open to any suggestions, even if the suggestion is conceptually different that what I'm describing.

Thank you very much

回答1:

You can use generateDS to create django models from your XSD. You do this using the gends_run_gen_django script, which is located under the django directory in the generateDS source. Here is some documentation on that functionality. Relevant quote:

Here is an overview of the process:

Step 1. Generate bindings -- Run generateDS.py.
Step 2. Extract simpleType definitions from schema -- Run
gends_extract_simple_types.py.
Step 3. Generate models.py and forms.py -- Run gends_generate_django.py.

The script gends_run_gen_django.py performs these three steps.

I believe django should give you most of the functionality of sqlalchemy. However, if you decide to use sqlalchemy instead then generateDS' django functionality might be a good model on which to base a similar sqlalchemy solution.

回答2:

Not sure if there is a way directly, but you could indirectly go from XSD to a SQL Server DB, and then import the DB from SQLAlchemy

来源：https://stackoverflow.com/questions/17750340/generate-python-class-and-sqlalchemy-code-from-xsd-to-store-xml-on-postgres