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Fixed #13245: Explained Oracle's behavior w.r.t db_table

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and how to prevent table-name truncation

Thanks russellm & timo for discussion, and timo for review.
This commit is contained in:
Shai Berger 2013-10-21 18:12:48 +03:00
parent aefc1d4e65
commit 317040a73b
2 changed files with 28 additions and 0 deletions
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16
docs/ref/databases.txt
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@ -758,6 +758,22 @@ Naming issues
Oracle imposes a name length limit of 30 characters. To accommodate this, the
backend truncates database identifiers to fit, replacing the final four
characters of the truncated name with a repeatable MD5 hash value.
Additionally, the backend turns database identifiers to all-uppercase.
To prevent these transformations (this is usually required only when dealing
with legacy databases or accessing tables which belong to other users), use
a quoted name as the value for ``db_table``::
class LegacyModel(models.Model):
class Meta:
db_table = '"name_left_in_lowercase"'
class ForeignModel(models.Model):
class Meta:
db_table = '"OTHER_USER"."NAME_ONLY_SEEMS_OVER_30"'
Quoted names can also be used with Django's other supported database
backends; except for Oracle, however, the quotes have no effect.
When running ``migrate``, an ``ORA-06552`` error may be encountered if
certain Oracle keywords are used as the name of a model field or the

12
docs/ref/models/options.txt
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@ -72,6 +72,18 @@ Django quotes column and table names behind the scenes.
the table name via ``db_table``, particularly if you are using the MySQL
backend. See the :ref:`MySQL notes <mysql-notes>` for more details.
.. admonition:: Table name quoting for Oracle
In order to to meet the 30-char limitation Oracle has on table names,
and match the usual conventions for Oracle databases, Django may shorten
table names and turn them all-uppercase. To prevent such transformations,
use a quoted name as the value for ``db_table``::
db_table = '"name_left_in_lowercase"'
Such quoted names can also be used with Django's other supported database
backends; except for Oracle, however, the quotes have no effect. See the
:ref:`Oracle notes <oracle-notes>` for more details.
``db_tablespace``
-----------------