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django1/django/db/models/sql/constants.py

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Internal refactoring; moving LOOKUP_SEP up one level. In an ideal world, nothing except django.db.models.query should have to import stuff from django.models.sql.*. A few things were needing to get hold of sql.constants.LOOKUP_SEP, so this commit moves it up to django.db.models.constants.LOOKUP_SEP. There are still a couple of places (admin) poking into sql.* to get QUERY_TERMS, which is unfortunate, but a slightly different issue and harder to adjust.
2012-09-09 07:51:36 +08:00
"""
Constants specific to the SQL storage portion of the ORM.
"""
Merged the queryset-refactor branch into trunk. This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-04-27 10:50:16 +08:00
import re
# Size of each "chunk" for get_iterator calls.
# Larger values are slightly faster at the expense of more storage space.
GET_ITERATOR_CHUNK_SIZE = 100
Fixed #10790 -- Refactored sql.Query.setup_joins() This is a rather large refactoring. The "lookup traversal" code was splitted out from the setup_joins. There is now names_to_path() method which does the lookup traveling, the actual work of setup_joins() is calling names_to_path() and then adding the joins found into the query. As a side effect it was possible to remove the "process_extra" functionality used by genric relations. This never worked for left joins. Now the extra restriction is appended directly to the join condition instead of the where clause. To generate the extra condition we need to have the join field available in the compiler. This has the side-effect that we need more ugly code in Query.__getstate__ and __setstate__ as Field objects aren't pickleable. The join trimming code got a big change - now we trim all direct joins and never trim reverse joins. This also fixes the problem in #10790 which was join trimming in null filter cases.
2012-08-25 21:33:07 +08:00
# Namedtuples for sql.* internal use.
Merged the queryset-refactor branch into trunk. This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-04-27 10:50:16 +08:00
# How many results to expect from a cursor.execute call
MULTI = 'multi'
SINGLE = 'single'
Made SQLCompiler.execute_sql(result_type) more explicit. Updated SQLUpdateCompiler.execute_sql to match the behavior described in the docstring; the 'first non-empty query' will now include all queries, not just the main and first related update. Added CURSOR and NO_RESULTS result_type constants to make the usages more self documenting and allow execute_sql to explicitly close the cursor when it is no longer needed.
2014-01-09 12:31:34 +08:00
CURSOR = 'cursor'
NO_RESULTS = 'no results'
Merged the queryset-refactor branch into trunk. This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-04-27 10:50:16 +08:00
Fixed #7098 -- Old-style related-model order_by() syntax was being incorrectly marked as erroneous. It's just more dangerous and risky, not forbidden. This commit restores backwards compatibility there. git-svn-id: http://code.djangoproject.com/svn/django/trunk@7490 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-04-28 10:27:19 +08:00
ORDER_PATTERN = re.compile(r'\?|[-+]?[.\w]+$')
Merged the queryset-refactor branch into trunk. This is a big internal change, but mostly backwards compatible with existing code. Also adds a couple of new features. Fixed #245, #1050, #1656, #1801, #2076, #2091, #2150, #2253, #2306, #2400, #2430, #2482, #2496, #2676, #2737, #2874, #2902, #2939, #3037, #3141, #3288, #3440, #3592, #3739, #4088, #4260, #4289, #4306, #4358, #4464, #4510, #4858, #5012, #5020, #5261, #5295, #5321, #5324, #5325, #5555, #5707, #5796, #5817, #5987, #6018, #6074, #6088, #6154, #6177, #6180, #6203, #6658 git-svn-id: http://code.djangoproject.com/svn/django/trunk@7477 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-04-27 10:50:16 +08:00
ORDER_DIR = {
'ASC': ('ASC', 'DESC'),
Fixed #17644 -- Changed Query.alias_map to use namedtuples This makes the code easier to understand and may even have a benefit in memory usage (namedtuples instead of dicts). Thanks, lrekucki and akaariai
2012-04-30 06:50:48 +08:00
'DESC': ('DESC', 'ASC'),
}
Fixed #23853 -- Added Join class to replace JoinInfo Also removed Query.join_map. This structure was used to speed up join reuse calculation. Initial benchmarking shows that this isn't actually needed. If there are use cases where the removal has real-world performance implications, it should be relatively straightforward to reintroduce it as map {alias: [Join-like objects]}.
2014-11-17 16:26:10 +08:00
# SQL join types.
INNER = 'INNER JOIN'
LOUTER = 'LEFT OUTER JOIN'