Mike Bayer 70c9bc0339 Add max_identifier_length parameter; warn for Oracle ...

Added new :func:`.create_engine` parameter
:paramref:`.create_engine.max_identifier_length`. This overrides the
dialect-coded "max identifier length" in order to accommodate for databases
that have recently changed this length and the SQLAlchemy dialect has
not yet been adjusted to detect for that version.  This parameter interacts
with the existing :paramref:`.create_engine.label_length` parameter in that
it establishes the maximum (and default) value for anonymously generated
labels.

The Oracle dialect now emits a warning if Oracle version 12.2 or greater is
used, and the :paramref:`.create_engine.max_identifier_length` parameter is
not set.   The version in this specific case defaults to that of the
"compatibility" version set in the Oracle server configuration, not the
actual server version.   In version 1.4, the default max_identifier_length
for 12.2 or greater will move to 128 characters.  In order to maintain
forwards compatibility, applications should set
:paramref:`.create_engine.max_identifier_length` to 30 in order to maintain
the same length behavior, or to 128 in order to test the upcoming behavior.
This length determines among other things how generated constraint names
are truncated for statements like ``CREATE CONSTRAINT`` and ``DROP
CONSTRAINT``, which means a the new length may produce a name-mismatch
against a name that was generated with the old length, impacting database
migrations.

Fixes: #4857
Change-Id: Ib62efb00c6180c375869029b57353d90385d7950

2019-10-02 14:54:12 -04:00

..

__init__.py

reorganized unit tests into subdirectories

2006-06-05 17:25:51 +00:00

test_case_statement.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_compare.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_compiler.py

Run row value processors up front

2019-10-01 16:52:24 -04:00

test_constraints.py

Ensure all Index arguments are counted when matching expr/columns

2019-07-24 09:30:57 -04:00

test_cte.py

Allow duplicate columns in from clauses and selectables

2019-07-11 14:20:10 -04:00

test_ddlemit.py

Implement checkfirst for Index.create(), Index.drop()

2019-08-06 23:11:54 -04:00

test_defaults.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_delete.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_deprecations.py

Unify generation between Core and ORM query

2019-09-26 11:26:43 -04:00

test_functions.py

self_group() for FunctionFilter

2019-07-12 22:44:27 -04:00

test_generative.py

Unify generation between Core and ORM query

2019-09-26 11:26:43 -04:00

test_insert_exec.py

Fix typos

2019-07-21 10:51:29 +10:00

test_insert.py

run a black run

2019-03-05 20:29:05 -05:00

test_inspect.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_join_rewriting.py

Allow duplicate columns in from clauses and selectables

2019-07-11 14:20:10 -04:00

test_labels.py

Add max_identifier_length parameter; warn for Oracle

2019-10-02 14:54:12 -04:00

test_lateral.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_metadata.py

Catch set_parent_w_dispatch missing

2019-09-06 18:43:58 -04:00

test_operators.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_query.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_quote.py

Modernize internal reflection

2019-08-06 18:05:45 -04:00

test_resultset.py

Run row value processors up front

2019-10-01 16:52:24 -04:00

test_returning.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_roles.py

Render LIMIT/OFFSET conditions after compile on select dialects

2019-08-30 17:38:09 -04:00

test_rowcount.py

Post black reformatting

2019-01-06 18:23:11 -05:00

test_selectable.py

Unify generation between Core and ORM query

2019-09-26 11:26:43 -04:00

test_tablesample.py

Prevent __init__ from being called for Alias, subclasses

2019-02-21 11:18:19 -05:00

test_text.py

Unify generation between Core and ORM query

2019-09-26 11:26:43 -04:00

test_type_expressions.py

Label simple column transformations as the column name

2019-08-28 17:11:15 -04:00

test_types.py

Render LIMIT/OFFSET conditions after compile on select dialects

2019-08-30 17:38:09 -04:00

test_unicode.py

Post black reformatting

2019-01-06 18:23:11 -05:00

test_update.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_utils.py

Reimplement .compare() in terms of a visitor

2019-04-29 11:54:25 -04:00