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Added FAQ point about bytea_output in PostgreSQL 9.0

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Daniele Varrazzo 2011-02-10 02:14:51 +00:00
parent 9c81f6c186
commit 713b86acdf
1 changed files with 12 additions and 0 deletions
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doc/src/faq.rst
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@ -94,6 +94,18 @@ Psycopg converts :sql:`decimal`\/\ :sql:`numeric` database types into Python `!D
documentation. If you find `!psycopg2.extensions.DECIMAL` not avalable, use
`!psycopg2._psycopg.DECIMAL` instead.
Transferring binary data from PostgreSQL 9.0 doesn't work.
PostgreSQL 9.0 uses by default `the "hex" format`__ to transfer
:sql:`bytea` data: the format can't be parsed by the libpq 8.4 and
earlier. Three options to solve the problem are:
- set the bytea_output__ parameter to ``escape`` in the server;
- use ``SET bytea_output TO escape`` in the client before reading binary
data;
- upgrade the libpq library on the client to at least 9.0.
.. __: http://www.postgresql.org/docs/9.0/static/datatype-binary.html
.. __: http://www.postgresql.org/docs/9.0/static/runtime-config-client.html#GUC-BYTEA-OUTPUT
Best practices
--------------