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Update pymssql dialect description, remove "limitations" section

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Marc Abramowitz
2014-02-27 18:45:31 -08:00
parent 078621494e
commit c1b7c2db19
1 changed files with 14 additions and 7 deletions
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lib/sqlalchemy/dialects/mssql/pymssql.py
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@@ -11,15 +11,22 @@
:connectstring: mssql+pymssql://<username>:<password>@<freetds_name>?charset=utf8
:url: http://pymssql.org/
Limitations
-----------
pymssql is a Python module that wraps FreeTDS (a C library) and provides a
DB-API interface, which this dialect uses.
pymssql inherits a lot of limitations from FreeTDS, including:
The 1.x versions of pymssql were written mostly in C, with a Python "outer
layer". These 1.x versions are no longer maintained.
* no support for multibyte schema identifiers
* poor support for large decimals
* poor support for binary fields
* poor support for VARCHAR/CHAR fields over 255 characters
The 2.x versions of pymssql are written completely in Cython so the code is
translated into C, which is compiled, leading to better performance. The 2.x
versions have had a good amount of development activity in 2013, and so far
this has continued in 2014. pymssql 2.x supports Python 2.6, Python 2.7, and
Python 3.3 and up.
Note that if you experience problems or limitations when using this dialect,
the problem could be in the dialect, in pymssql, or in FreeTDS (or it could
even be a limitation of SQL Server). So it would be great if you could isolate
the problem before filing tickets with these projects.
Please consult the pymssql documentation for further information.