44 lines
1.4 KiB
Python
44 lines
1.4 KiB
Python
"""
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Constants specific to the SQL storage portion of the ORM.
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"""
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from collections import namedtuple
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import re
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# Valid query types (a set is used for speedy lookups). These are (currently)
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# considered SQL-specific; other storage systems may choose to use different
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# lookup types.
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QUERY_TERMS = set([
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'exact', 'iexact', 'contains', 'icontains', 'gt', 'gte', 'lt', 'lte', 'in',
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'startswith', 'istartswith', 'endswith', 'iendswith', 'range', 'year',
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'month', 'day', 'week_day', 'hour', 'minute', 'second', 'isnull', 'search',
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'regex', 'iregex',
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])
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# Size of each "chunk" for get_iterator calls.
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# Larger values are slightly faster at the expense of more storage space.
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GET_ITERATOR_CHUNK_SIZE = 100
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# Namedtuples for sql.* internal use.
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# Join lists (indexes into the tuples that are values in the alias_map
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# dictionary in the Query class).
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JoinInfo = namedtuple('JoinInfo',
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'table_name rhs_alias join_type lhs_alias '
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'join_cols nullable join_field')
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# Pairs of column clauses to select, and (possibly None) field for the clause.
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SelectInfo = namedtuple('SelectInfo', 'col field')
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# How many results to expect from a cursor.execute call
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MULTI = 'multi'
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SINGLE = 'single'
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CURSOR = 'cursor'
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NO_RESULTS = 'no results'
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ORDER_PATTERN = re.compile(r'\?|[-+]?[.\w]+$')
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ORDER_DIR = {
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'ASC': ('ASC', 'DESC'),
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'DESC': ('DESC', 'ASC'),
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}
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