oneself oneself - 1 year ago 81
Python Question

cx_Oracle and the data source paradigm

There is a Java paradigm for database access implemented in the Java

. This object create a useful abstraction around the creation of database connections. The
object keeps database configuration, but will only create database connections on request. This is allows you to keep all database configuration and initialization code in one place, and makes it easy to change database implementation, or use a mock database for testing.

I currently working on a Python project which uses cx_Oracle. In cx_Oracle, one gets a connection directly from the module:

import cx_Oracle as dbapi
connection = dbapi.connect(connection_string)
# At this point I am assuming that a real connection has been made to the database.
# Is this true?

I am trying to find a parallel to the
in cx_Oracle. I can easily create this by creating a new class and wrapping cx_Oracle, but I was wondering if this is the right way to do it in Python.

Answer Source

You'll find relevant information of how to access databases in Python by looking at PEP-249: Python Database API Specification v2.0. cx_Oracle conforms to this specification, as do many database drivers for Python.

In this specification a Connection object represents a database connection, but there is no built-in pooling. Tools such as SQLAlchemy do provide pooling facilities, and although SQLAlchemy is often billed as an ORM, it does not have to be used as such and offers nice abstractions for use on top of SQL engines.

If you do want to do object-relational-mapping, then SQLAlchemy does the business, and you can consider either its own declarative syntax or another layer such as Elixir which sits on top of SQLAlchemy and provides increased ease of use for more common use cases.

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