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.. dialect:: firebird
:name: Firebird
.. note::
The Firebird dialect within SQLAlchemy **is not currently supported**. The
dialect is not tested within continuous integration and is likely to have
many issues and caveats not currently handled.
Firebird Dialects
-----------------
Firebird offers two distinct dialects_ (not to be confused with a
SQLAlchemy ``Dialect``):
dialect 1
This is the old syntax and behaviour, inherited from Interbase pre-6.0.
dialect 3
This is the newer and supported syntax, introduced in Interbase 6.0.
The SQLAlchemy Firebird dialect detects these versions and
adjusts its representation of SQL accordingly. However,
support for dialect 1 is not well tested and probably has
incompatibilities.
Locking Behavior
----------------
Firebird locks tables aggressively. For this reason, a DROP TABLE may
hang until other transactions are released. SQLAlchemy does its best
to release transactions as quickly as possible. The most common cause
of hanging transactions is a non-fully consumed result set, i.e.::
result = engine.execute("select * from table")
row = result.fetchone()
return
Where above, the ``ResultProxy`` has not been fully consumed. The
connection will be returned to the pool and the transactional state
rolled back once the Python garbage collector reclaims the objects
which hold onto the connection, which often occurs asynchronously.
The above use case can be alleviated by calling ``first()`` on the
``ResultProxy`` which will fetch the first row and immediately close
all remaining cursor/connection resources.
RETURNING support
-----------------
Firebird 2.0 supports returning a result set from inserts, and 2.1
extends that to deletes and updates. This is generically exposed by
the SQLAlchemy ``returning()`` method, such as::
# INSERT..RETURNING
result = table.insert().returning(table.c.col1, table.c.col2).\
values(name='foo')
print result.fetchall()
# UPDATE..RETURNING
raises = empl.update().returning(empl.c.id, empl.c.salary).\
where(empl.c.sales>100).\
values(dict(salary=empl.c.salary * 1.1))
print raises.fetchall()
.. _dialects: http://mc-computing.com/Databases/Firebird/SQL_Dialect.html
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