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db.select() can now use filter; returns total count, and selection

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This commit is contained in:
Doug Blank
2016-01-08 14:07:43 -05:00
parent cc00442e0b
commit 1654757c22
1 changed files with 70 additions and 53 deletions
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123
gramps/gen/db/base.py
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@@ -1880,7 +1880,7 @@ class DbWriteBase(DbReadBase):
filter=None):
"""
Default implementation of a select for those databases
that don't support SQL. Yields data row by row.
that don't support SQL. Returns a list of dicts, and total.
table - Person, Family, etc.
fields - used by object.get_field()
@@ -1890,6 +1890,11 @@ class DbWriteBase(DbReadBase):
filter - {field: (SQL string_operator, value), }
handles all SQL except for NOT expression, eg NOT x = y
"""
class Result(list):
"""
A list rows of just matching for this page, with total = all.
"""
total = 0
def hash_name(name):
"""
Used in filter to eval expressions involving selected
@@ -1914,61 +1919,73 @@ class DbWriteBase(DbReadBase):
data = self._tables[table]["handles_func"]()
position = 0
selected = 0
for handle in data:
if position < start:
pass # skip it
else:
result = Result()
if filter:
for handle in data:
# have to evaluate all, because there is a filter
item = self._tables[table]["handle_func"](handle)
row = {}
env = {}
for field in fields:
for field in filter.keys():
# just the ones we need for filter
value = item.get_field(field)
row[field] = value
if filter:
env[hash_name(field)] = value
if filter:
matched = True
for name, (op, value) in filter.items():
v = eval(hash_name(name), env)
if op == "=":
matched = v == value
elif op == ">":
matched = v > value
elif op == ">=":
matched = v >= value
elif op == "<":
matched = v < value
elif op == "<=":
matched = v <= value
elif op == "IN":
matched = v in value
elif op == "IS":
matched = v is value
elif op == "IS NOT":
matched = v is not value
elif op == "IS NULL":
matched = v is None
elif op == "IS NOT NULL":
matched = v is not None
elif op == "BETWEEN":
matched = value[0] <= v <= value[1]
elif op in ["<>", "!="]:
matched = v != value
elif op == "LIKE":
value = value.replace("%", "(.*)").replace("_", ".")
matched = re.match(value, v)
else:
raise Exception("invalid select operator: '%s'" % op)
if not matched:
break
if matched:
selected += 1
yield row
env[hash_name(field)] = value
matched = True
for name, (op, value) in filter.items():
v = eval(hash_name(name), env)
if op == "=":
matched = v == value
elif op == ">":
matched = v > value
elif op == ">=":
matched = v >= value
elif op == "<":
matched = v < value
elif op == "<=":
matched = v <= value
elif op == "IN":
matched = v in value
elif op == "IS":
matched = v is value
elif op == "IS NOT":
matched = v is not value
elif op == "IS NULL":
matched = v is None
elif op == "IS NOT NULL":
matched = v is not None
elif op == "BETWEEN":
matched = value[0] <= v <= value[1]
elif op in ["<>", "!="]:
matched = v != value
elif op == "LIKE":
value = value.replace("%", "(.*)").replace("_", ".")
matched = re.match(value, v)
else:
continue
else:
raise Exception("invalid select operator: '%s'" % op)
if not matched:
break
if matched:
if selected < limit and start <= position:
# now, we get all of the fields
for field in fields:
value = item.get_field(field)
row[field] = value
selected += 1
result.append(row)
position += 1
result.total = position
else: # no filter
for handle in data:
if position >= start:
if selected >= limit:
break
item = self._tables[table]["handle_func"](handle)
row = {}
for field in fields:
value = item.get_field(field)
row[field] = value
result.append(row)
selected += 1
yield row
position += 1
if selected == limit:
break
position += 1
result.total = self._tables[table]["count_func"]()
return result