42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
"""
|
|
Constants specific to the SQL storage portion of the ORM.
|
|
"""
|
|
|
|
from collections import namedtuple
|
|
import re
|
|
|
|
# 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.
|
|
QUERY_TERMS = set([
|
|
'exact', 'iexact', 'contains', 'icontains', 'gt', 'gte', 'lt', 'lte', 'in',
|
|
'startswith', 'istartswith', 'endswith', 'iendswith', 'range', 'year',
|
|
'month', 'day', 'week_day', 'hour', 'minute', 'second', 'isnull', 'search',
|
|
'regex', 'iregex',
|
|
])
|
|
|
|
# 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
|
|
|
|
# Namedtuples for sql.* internal use.
|
|
|
|
# Join lists (indexes into the tuples that are values in the alias_map
|
|
# dictionary in the Query class).
|
|
JoinInfo = namedtuple('JoinInfo',
|
|
'table_name rhs_alias join_type lhs_alias '
|
|
'lhs_join_col rhs_join_col nullable join_field')
|
|
|
|
# Pairs of column clauses to select, and (possibly None) field for the clause.
|
|
SelectInfo = namedtuple('SelectInfo', 'col field')
|
|
|
|
# How many results to expect from a cursor.execute call
|
|
MULTI = 'multi'
|
|
SINGLE = 'single'
|
|
|
|
ORDER_PATTERN = re.compile(r'\?|[-+]?[.\w]+$')
|
|
ORDER_DIR = {
|
|
'ASC': ('ASC', 'DESC'),
|
|
'DESC': ('DESC', 'ASC'),
|
|
}
|