parsed = parse(sql)
except:
# Propably it's a PyTables expression
- for token in ['group by', 'order by', 'limit']:
+ for token in ['group by', 'order by', 'limit', '']:
res = re.search('(?i)where (.*)' + token, sql)
if res:
modified_sql = re.sub('(?i)where (.*)(' + token + ')', '\g<2>', sql)
parsed = parse(modified_sql)
- parsed['where'] = res.group(1)
+ parsed['where'] = res.group(1).strip()
break
# Always a list of fields
self.path = path
self.h5file = tables.open_file(path)
- def execute(self, sql, params=None, truncate=False):
+ def execute(self, sql, params=None, truncate=False, page_size=None):
if params is None:
params = {}
rows = []
description = []
parsed_sql = _parse_sql(sql, params)
+
+ if parsed_sql['from'] == 'sqlite_master':
+ return self._execute_datasette_query(sql, params)
+
table = self.h5file.get_node(parsed_sql['from'])
table_rows = []
fields = parsed_sql['select']
if end - start > max_rows:
end = start + max_rows
+ # Truncate if needed
+ if page_size and truncate:
+ if end - start > page_size:
+ end = start + page_size
+ truncated = True
+
# Execute query
if query:
table_rows = table.where(query, params, start, end)
else:
return rows
-class Row(OrderedDict):
- def __getitem__(self, label):
- if type(label) is int:
- return super(OrderedDict, self).__getitem__(list(self.keys())[label])
+ def _execute_datasette_query(self, sql, params):
+ "Datasette special queries for getting tables info"
+ if sql == "SELECT count(*) from sqlite_master WHERE type = 'view' and name=:n":
+ row = Row()
+ row['count(*)'] = 0
+ return [row]
+ elif sql == 'select sql from sqlite_master where name = :n and type="table"':
+ try:
+ table = self.h5file.get_node(params['n'])
+ row = Row()
+ row['sql'] = 'CREATE TABLE {} ()'.format(params['n'])
+ return [row]
+ except:
+ return []
+ else:
+ raise Exception("SQLite queries cannot be executed with this connector")
+
+class Row(list):
+ def __init__(self, values=None):
+ self.labels = []
+ self.values = []
+ if values:
+ for idx in values:
+ self.__setitem__(idx, values[idx])
+
+ def __setitem__(self, idx, value):
+ if type(idx) is str:
+ if idx in self.labels:
+ self.values[self.labels.index(idx)] = value
+ else:
+ self.labels.append(idx)
+ self.values.append(value)
+ else:
+ self.values[idx] = value
+
+ def __getitem__(self, idx):
+ if type(idx) is str:
+ return self.values[self.labels.index(idx)]
else:
- return super(OrderedDict, self).__getitem__(label)
+ return self.values[idx]
def __iter__(self):
- return self.values().__iter__()
+ return self.values.__iter__()