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=================================================================
JayDeBeApi - bridge from JDBC database drivers to Python DB-API
=================================================================
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The JayDeBeApi module allows you to connect from Python code to
databases using Java `JDBC
<http://java.sun.com/products/jdbc/overview.html>`_. It provides a
Python DB-API_ v2.0 to that database.
It works on ordinary Python (cPython) using the JPype_ Java
integration or on `Jython <http://www.jython.org/>`_ to make use of
the Java JDBC driver.
In contrast to zxJDBC from the Jython project JayDeBeApi let's you
access a database with Jython AND Python with only minor code
modifications. JayDeBeApi's future goal is to provide a unique and
fast interface to different types of JDBC-Drivers through a flexible
plug-in mechanism.
.. contents::
Install
=======
You can get and install JayDeBeApi with `pip <http://pip.pypa.io/>`_
::
$ pip install JayDeBeApi
If you want to install JayDeBeApi in Jython make sure to have pip or
EasyInstall available for it.
Or you can get a copy of the source by cloning from the `JayDeBeApi
github project <https://github.com/baztian/jaydebeapi>`_ and install
with ::
$ python setup.py install
or if you are using Jython use ::
$ jython setup.py install
It has been tested with Jython 2.7.2.
If you are using cPython ensure that you have installed JPype_
properly. It has been tested with JPype1 0.6.3 and 0.7.5 for Python 3 and
with JPype1 0.6.3 and 0.7.0 for Python 2.7. Older JPype
installations may cause problems.
Usage
=====
Basically you just import the ``jaydebeapi`` Python module and execute
the ``connect`` method. This gives you a DB-API_ conform connection to
the database.
The first argument to ``connect`` is the name of the Java driver
class. The second argument is a string with the JDBC connection
URL. Third you can optionally supply a sequence consisting of user and
password or alternatively a dictionary containing arguments that are
internally passed as properties to the Java
``DriverManager.getConnection`` method. See the Javadoc of
``DriverManager`` class for details.
The next parameter to ``connect`` is optional as well and specifies
the jar-Files of the driver if your classpath isn't set up
sufficiently yet. The classpath set in ``CLASSPATH`` environment
variable will be honored. See the documentation of your Java runtime
environment.
Here is an example:
>>> import jaydebeapi
>>> conn = jaydebeapi.connect("org.hsqldb.jdbcDriver",
... "jdbc:hsqldb:mem:.",
... ["SA", ""],
... "/path/to/hsqldb.jar",)
>>> curs = conn.cursor()
>>> curs.execute('create table CUSTOMER'
... '("CUST_ID" INTEGER not null,'
... ' "NAME" VARCHAR(50) not null,'
... ' primary key ("CUST_ID"))'
... )
>>> curs.execute("insert into CUSTOMER values (1, 'John')")
>>> curs.execute("select * from CUSTOMER")
>>> curs.fetchall()
[(1, u'John')]
>>> curs.close()
>>> conn.close()
An alternative way to establish connection using connection
properties:
>>> conn = jaydebeapi.connect("org.hsqldb.jdbcDriver",
... "jdbc:hsqldb:mem:.",
... {'user': "SA", 'password': "",
... 'other_property': "foobar"},
... "/path/to/hsqldb.jar",)
If you're having trouble getting this work check if your ``JAVA_HOME``
environmentvariable is set correctly. For example I have to set it on
my Ubuntu machine like this ::
$ JAVA_HOME=/usr/lib/jvm/java-8-openjdk python
Supported databases
===================
In theory *every database with a suitable JDBC driver should work*. It
is confirmed to work with the following databases:
* SQLite
* Hypersonic SQL (HSQLDB)
* IBM DB2
* IBM DB2 for mainframes
* Oracle
* Teradata DB
* Netezza
* Mimer DB
* Microsoft SQL Server
* MySQL
* PostgreSQL
* many more...
Contributing
============
Please submit `bugs and patches
<https://github.com/baztian/jaydebeapi/issues>`_. All contributors
will be acknowledged. Thanks!
License
=======
JayDeBeApi is released under the GNU Lesser General Public license
(LGPL). See the file ``COPYING`` and ``COPYING.LESSER`` in the
distribution for details.
Changelog
=========
- Next version - unreleased
- 1.2.0 - 2020-05-22
- Added compatibility to JPype1 0.7.2+ (thanks to @dpd)
- Support `with` statement (thanks to @Szczepanov)
- 1.1.2 - 2019-09-02
- Added compatibility to JPype1 0.7 (thanks to @Iverian, @Thrameos)
- Dropped python 2.6 support
- Fix build working with newer Maven versions
- Accidently force-pushed to master branch. Sorry for that.
- 1.1.1 - 2017-03-21
- Don't fail on dates before 1900 on Python < 3.
- 1.1.0 - 2017-03-19
- Support BIT and TINYINT type mappings (thanks @Mokubyow for
reporting the issue).
- 1.0.0 - 2017-01-10
- Allow for db properties to be passed to the connect
method. *Probably incompatible to code based on previous
versions.* See documentation of the connect method. (Thanks
@testlnord for you efforts and the patience.)
- New major version due to possible api incompatibility.
- 0.2.0 - 2015-04-26
- Python 3 support (requires JPype1 >= 0.6.0).
- 0.1.6 - 2015-04-10
- Fix Jython handling of Java exceptions that don't subclass python Exception
- Enrich exceptions with message from java SQLExceptions
- Be more specific about DB API exceptions: Distinguish DatabaseError and
InterfaceError.
- Fix typo LONGNARCHAR vs LONGVARCHAR (thanks @datdo for reporting #4)
- 0.1.5 - 2015-03-02
- Add version number to module.
- Improve robustness of java to python type conversion.
- Support Time type.
- Add DB-API compliant exception handling.
- Minor documentation improvements.
- Some development related changes (Host project at github, use
Travis CI, use JPype1 for tests).
- 0.1.4 - 2013-10-29
- More convenient way to setup Java classpath. *Important note*
check the changes to the ``connect`` method and adapt your code.
- Honor ``CLASSPATH`` if used in JPype mode.
- Set ``.rowcount`` properly.
- Changed signature of ``.setoutputsize()`` to be DB-API compliant.
- 0.1.3 - 2011-01-27
- Fixed DB-API_ violation: Use ``curs.execute('foo ?', (bar, baz))``
instead of ``curs.execute('foo ?', bar, baz)``.
- Free resources after ``executemany`` call.
- Improved type handling. Initial support for BLOB columns.
- 0.1.2 - 2011-01-25
- ``easy_install JayDeBeApi`` should really work.
- 0.1.1 - 2010-12-12
- Fixed bug #688290 "NULL values with converters error on fetch".
- Fixed bug #684909 "Selecting ROWIDs errors out on fetch".
- 0.1 - 2010-08-10
- Initial release.
To do
=====
- Extract Java calls to separate Java methods to increase performance.
- Check if https://code.launchpad.net/dbapi-compliance can help making
JayDeBeApi more DB-API compliant.
- Test it on different databases and provide a flexible db specific
pluign mechanism.
- SQLAlchemy modules (separate project)
.. _DB-API: http://www.python.org/dev/peps/pep-0249/
.. _JPype: https://pypi.python.org/pypi/JPype1/
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