+from collections import OrderedDict
+import sqlparse
+import tables
+
+_connector_type = 'pytables'
+
def inspect(path):
"Open file and return tables info"
- return [], []
+ h5tables = {}
+ views = []
+ h5file = tables.open_file(path)
+
+ for table in filter(lambda node: not(isinstance(node, tables.group.Group)), h5file):
+ colnames = []
+ if isinstance(table, tables.table.Table):
+ colnames = table.colnames
+
+ h5tables[table._v_pathname] = {
+ 'name': table._v_pathname,
+ 'columns': colnames,
+ 'primary_keys': [],
+ 'count': int(table.nrows),
+ 'label_column': None,
+ 'hidden': False,
+ 'fts_table': None,
+ 'foreign_keys': {'incoming': [], 'outgoing': []},
+ }
+
+ h5file.close()
+ return h5tables, views, _connector_type
+
+def _parse_sql(sql):
+ parsed = sqlparse.parse(sql)
+ stmt = parsed[0]
+ parsed_sql = {}
+ current_keyword = ""
+ for token in stmt.tokens:
+ if token.is_keyword:
+ if current_keyword in parsed_sql and parsed_sql[current_keyword] == '':
+ # Check composed keywords like 'order by'
+ del parsed_sql[current_keyword]
+ current_keyword += " " + str(token)
+ else:
+ current_keyword = str(token)
+ parsed_sql[current_keyword] = ""
+ elif type(token) is sqlparse.sql.Where:
+ parsed_sql['where'] = token
+ else:
+ if not token.is_whitespace:
+ parsed_sql[current_keyword] += str(token)
+ return parsed_sql
+
+_operators = {
+ '=': '==',
+}
+
+def _translate_condition(table, condition, params):
+ field = condition.left.get_real_name()
+
+ operator = list(filter(lambda t: t.ttype == sqlparse.tokens.Comparison, condition.tokens))[0]
+ if operator.value in _operators:
+ operator = _operators[operator.value]
+ else:
+ operator = operator.value
+
+ value = condition.right.value
+ if value.startswith(':'):
+ # Value is a parameters
+ value = value[1:]
+ if value in params:
+ # Cast value to the column type
+ coltype = table.coltypes[field]
+ if coltype == 'string':
+ params[value] = str(params[value])
+ elif coltype.startswith('int'):
+ params[value] = int(params[value])
+ elif coltype.startswith('float'):
+ params[value] = float(params[value])
+
+ translated = "{left} {operator} {right}".format(left=field, operator=operator, right=value)
+ return translated, params
+
+class Connection:
+ def __init__(self, path):
+ self.path = path
+ self.h5file = tables.open_file(path)
+
+ def execute(self, sql, params=None, truncate=False):
+ if params is None:
+ params = {}
+ rows = []
+ truncated = False
+ description = []
+
+ parsed_sql = _parse_sql(sql)
+ table = self.h5file.get_node(parsed_sql['from'][1:-1])
+ table_rows = []
+ fields = parsed_sql['select'].split(',')
+
+ # Use 'where' statement or get all the rows
+ if 'where' in parsed_sql:
+ query = ''
+ start = 0
+ end = table.nrows
+ try:
+ conditions = []
+ for condition in parsed_sql['where'].get_sublists():
+ if str(condition) == '"rowid"=:p0':
+ start = int(params['p0'])
+ end = start + 1
+ else:
+ translated, params = _translate_condition(table, condition, params)
+ conditions.append(translated)
+ if conditions:
+ query = ') & ('.join(conditions)
+ query = '(' + query + ')'
+ except:
+ # Probably it's a PyTables query
+ query = str(parsed_sql['where'])[6:] # without where keyword
+
+ if query:
+ table_rows = table.where(query, params, start, end)
+ else:
+ table_rows = table.iterrows(start, end)
+ else:
+ table_rows = table.iterrows()
+
+ # Prepare rows
+ if len(fields) == 1 and fields[0] == 'count(*)':
+ rows.append(Row({fields[0]: int(table.nrows)}))
+ else:
+ for table_row in table_rows:
+ row = Row()
+ for field in fields:
+ if field == 'rowid':
+ row[field] = int(table_row.nrow)
+ elif field == '*':
+ for col in table.colnames:
+ value = table_row[col]
+ if type(value) is bytes:
+ value = value.decode('utf-8')
+ row[col] = value
+ else:
+ row[field] = table_row[field]
+ rows.append(row)
+
+ # Prepare query description
+ for field in fields:
+ if field == '*':
+ for col in table.colnames:
+ description.append((col,))
+ else:
+ description.append((field,))
+
+ # Return the rows
+ if truncate:
+ return rows, truncated, tuple(description)
+ else:
+ return rows
+
+class Row(OrderedDict):
+ def __getitem__(self, label):
+ if type(label) is int:
+ return super(OrderedDict, self).__getitem__(list(self.keys())[label])
+ else:
+ return super(OrderedDict, self).__getitem__(label)
+
+ def __iter__(self):
+ return self.values().__iter__()