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db.select(): added [NOT filter]

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This commit is contained in:
Doug Blank 2016-01-11 17:43:53 -05:00
parent f45c75988c
commit 2195c2e885
1 changed files with 10 additions and 7 deletions
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17
gramps/gen/db/base.py
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@ -1881,18 +1881,18 @@ class DbWriteBase(DbReadBase):
filter=None):
"""
Default implementation of a select for those databases
that don't support SQL. Returns a list of dicts, and total.
that don't support SQL. Returns a list of dicts, total,
and time.
table - Person, Family, etc.
fields - used by object.get_field()
sort - use sort order (argument to DB.get_X_handles)
start - position to start
limit - count to get; -1 for all
filter - (field, SQL string_operator, value)
["AND", [filter, filter, ...]]
["OR", [filter, filter, ...]]
handles all SQL except for NOT expression, eg NOT x = y
filter - (field, SQL string_operator, value) |
["AND", [filter, filter, ...]] |
["OR", [filter, filter, ...]] |
["NOT", filter]
"""
class Result(list):
"""
@ -1900,6 +1900,7 @@ class DbWriteBase(DbReadBase):
and time = time to select.
"""
total = 0
time = 0.0
def hash_name(table, name):
"""
Used in filter to eval expressions involving selected
@ -1954,7 +1955,7 @@ class DbWriteBase(DbReadBase):
"""
Evaluates the names in all conditions.
"""
if len(condition) == 2: # ["AND"|"OR" [...]]
if len(condition) == 2: # ["AND" [...]] | ["OR" [...]] | ["NOT" expr]
connector, exprs = condition
for expr in exprs:
evaluate_values(expr, item, db, table, env)
@ -1979,6 +1980,8 @@ class DbWriteBase(DbReadBase):
if evaluate_truth(expr, item, db, table, env):
return True
return False
elif connector == "NOT": # return not of single value
return not evaluate_truth(exprs, item, db, table, env)
else:
raise Exception("No such connector: '%s'" % connector)
elif len(condition) == 3: # (name, op, value)