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Safari | Python Developer's Handbook -> Python DB API





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Python DB API

The quest to provide a standard way to interface to database systems drove a group of people to develop Python Database API. The Python DB API is maintained by the Database Special Interest Group (DB-SIG). For more information, check out their Web site at http://www.python.org/sigs/db-sig/.

The following list shows all the database modules that currently implement the Python DB API specification proposed by the DB-SIG. This means that after you understand the API, you will be able to handle, in a similar way, all the databases that are manipulated by the following modules:

This is the information available at the time this book was written. For an updated list of modules, check out http://www.python.org/topics/database/modules.html.

DB-API Specification v2.0

The following specification is available online at http://www.python.org/topics/database/DatabaseAPI-2.0.html.

Comments and questions about this specification can be directed to the SIG for Database Interfacing with Python at the email address db-sig@python.org.

For more information on database interfacing with Python and available packages, see the Database Topics Guide at http://www.python.org.

This document describes the Python Database API Specification 2.0. The previous version 1.0 is still available online at the Python Web site as a reference. Package writers are encouraged to use this version of the specification as the basis for new interfaces.

This API has been defined to encourage similarity between the Python modules that are used to access databases. By doing this, we hope to achieve a consistency leading to more easily understood modules, code that is generally more portable across databases, and a broader reach of database connectivity from Python.

The interface specification consists of several sections:

  • Module Interface

  • Connection Objects

  • Cursor Objects

  • Type Objects and Constructors

  • Implementation Hints

  • Major Changes from 1.0 to 2.0

Module Interface

Access to the database is made available through connection objects. The module must provide the following constructor for these:

connect(parameters)This is a constructor for creating a connection to the database. Returns a Connection Object. It takes a number of parameters that are database dependent.1

These module globals must be defined:

apilevelThis string constant states the supported DB API level. Currently only the strings '1.0' and '2.0' are allowed.

If not given, a Database API 1.0 level interface should be assumed.

threadsafetyThis integer constant states the level of thread safety that the interface supports. Possible values are

0Threads cannot share the module.

1Threads can share the module, but not conn ... ... (Not finished, please download and read the complete file)

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