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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.
"""
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
from collections import namedtuple
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
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
# Valid query types (a set is used for speedy lookups). These are (currently)
# considered SQL-specific; other storage systems may choose to use different
# lookup types.
Switch a datastructure internal to the ORM to be a set, instead of a dictionary.
2012-04-30 10:18:30 +08:00
QUERY_TERMS = set([
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
'exact', 'iexact', 'contains', 'icontains', 'gt', 'gte', 'lt', 'lte', 'in',
'startswith', 'istartswith', 'endswith', 'iendswith', 'range', 'year',
Fixed #7672 -- Added a 'week_day' lookup type. Many thanks to Ross Poulton for the proposal and implementation on all built-in database backends.. git-svn-id: http://code.djangoproject.com/svn/django/trunk@9818 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2009-02-08 13:08:06 +08:00
'month', 'day', 'week_day', 'isnull', 'search', 'regex', 'iregex',
Switch a datastructure internal to the ORM to be a set, instead of a dictionary.
2012-04-30 10:18:30 +08:00
])
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
# 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.
Fixed #8439 -- Complex combinations of Q-objects (using both conjunctions and disjunctions) were producing incorrect SQL when nullable relations were involved. This fixes that. git-svn-id: http://code.djangoproject.com/svn/django/trunk@8832 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2008-09-02 10:16:41 +08:00
# Join lists (indexes into the tuples that are values in the alias_map
# dictionary in the Query class).
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
JoinInfo = namedtuple('JoinInfo',
'table_name rhs_alias join_type lhs_alias '
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
'lhs_join_col rhs_join_col nullable join_field')
Fixed #19190 -- Refactored Query select clause attributes The Query.select and Query.select_fields were collapsed into one list because the attributes had to be always in sync. Now that they are in one attribute it is impossible to edit them out of sync. Similar collapse was done for Query.related_select_cols and Query.related_select_fields.
2012-10-26 01:57:32 +08:00
# Pairs of column clauses to select, and (possibly None) field for the clause.
SelectInfo = namedtuple('SelectInfo', 'col field')
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'
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'),
}