3 from collections import OrderedDict
5 _connector_type = 'pytables'
8 "Open file and return tables info"
11 h5file = tables.open_file(path)
13 for table in filter(lambda node: not(isinstance(node, tables.group.Group)), h5file):
15 if isinstance(table, tables.table.Table):
16 colnames = table.colnames
18 h5tables[table._v_pathname] = {
19 'name': table._v_pathname,
26 'foreign_keys': {'incoming': [], 'outgoing': []},
30 return h5tables, views, _connector_type
33 parsed = sqlparse.parse(sql)
37 for token in stmt.tokens:
39 if current_keyword in parsed_sql and parsed_sql[current_keyword] == '':
40 # Check composed keywords like 'order by'
41 del parsed_sql[current_keyword]
42 current_keyword += " " + str(token)
44 current_keyword = str(token)
45 parsed_sql[current_keyword] = ""
46 elif type(token) is sqlparse.sql.Where:
47 parsed_sql['where'] = token
49 if not token.is_whitespace:
50 parsed_sql[current_keyword] += str(token)
54 def __init__(self, path):
56 self.h5file = tables.open_file(path)
58 def execute(self, sql, params=None, truncate=False):
63 parsed_sql = _parse_sql(sql)
64 table = self.h5file.get_node(parsed_sql['from'][1:-1])
66 fields = parsed_sql['select'].split(',')
68 # Use 'where' statement or get all the rows
69 if 'where' in parsed_sql:
73 for condition in parsed_sql['where'].get_sublists():
74 if str(condition) == '"rowid"=:p0':
75 start = int(params['p0'])
78 table_rows = table.where(query, start, end)
80 table_rows = table.iterrows(start, end)
82 table_rows = table.iterrows()
85 if len(fields) == 1 and fields[0] == 'count(*)':
86 rows.append(Row({fields[0]: table.nrows}))
88 for table_row in table_rows:
92 row[field] = table_row.nrow
94 for col in table.colnames:
95 value = table_row[col]
96 if type(value) is bytes:
97 value = value.decode('utf-8')
100 row[field] = table_row[field]
103 # Prepare query description
106 for col in table.colnames:
107 description.append((col,))
109 description.append((field,))
112 return rows, truncated, tuple(description)
116 class Row(OrderedDict):
117 def __getitem__(self, label):
118 if type(label) is int:
119 return super(OrderedDict, self).__getitem__(list(self.keys())[label])
121 return super(OrderedDict, self).__getitem__(label)
124 return self.values().__iter__()