A pure Python Database Abstraction Layer
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pyDAL is a pure Python Database Abstraction Layer.

It dynamically generates the SQL in real time using the specified dialect for the database back end, so that you do not have to write SQL code or learn different SQL dialects (the term SQL is used generically), and your code will be portable among different types of databases.

pyDAL comes from the original web2py's DAL, with the aim of being wide-compatible. pyDAL doesn't require web2py and can be used in any Python context.

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You can install pyDAL using pip:

pip install pyDAL

Usage and documentation

Here is a quick example:

>>> from pydal import DAL, Field
>>> db = DAL('sqlite://storage.db')
>>> db.define_table('thing',Field('name'))
>>> db.thing.insert(name='Chair')
>>> query = db.thing.name.startswith('C')
>>> rows = db(query).select()
>>> print rows[0].name
>>> db.commit()

The complete documentation is available on http://www.web2py.com/books/default/chapter/29/06/the-database-abstraction-layer

What's in the box?

A little taste of pyDAL features:

  • Transactions
  • Aggregates
  • Inner Joins
  • Outer Joins
  • Nested Selects

Which databases are supported?

pyDAL actually support these databases:

  • sqlite
  • postgresql
  • mysql
  • mssql
  • db2
  • firebird
  • sybase
  • oracle
  • informix
  • teradata
  • sapdb
  • ingres
  • cubrid
  • imap
  • mongodb


pyDAL is released under the BSD-3c License. For further details, please check the LICENSE file.