- def sync(self, commit = True):
- """
- Flush changes back to the database.
- """
-
- self.validate()
-
- # Fetch a new node_id if necessary
- if 'node_id' not in self:
- rows = self.api.db.selectall("SELECT NEXTVAL('nodes_node_id_seq') AS node_id")
- if not rows:
- raise PLCDBError, "Unable to fetch new node_id"
- self['node_id'] = rows[0]['node_id']
- insert = True
- else:
- insert = False
-
- # Filter out fields that cannot be set or updated directly
- nodes_fields = self.api.db.fields('nodes')
- fields = dict(filter(lambda (key, value): key in nodes_fields,
- self.items()))
- for ro_field in 'date_created', 'last_updated':
- if ro_field in fields:
- del fields[ro_field]
-
- # Parameterize for safety
- keys = fields.keys()
- values = [self.api.db.param(key, value) for (key, value) in fields.items()]
-
- if insert:
- # Insert new row in nodes table
- sql = "INSERT INTO nodes (%s) VALUES (%s)" % \
- (", ".join(keys), ", ".join(values))
- else:
- # Update existing row in nodes table
- columns = ["%s = %s" % (key, value) for (key, value) in zip(keys, values)]
- sql = "UPDATE nodes SET " + \
- ", ".join(columns) + \
- " WHERE node_id = %(node_id)d"
-
- self.api.db.do(sql, fields)
-
- if commit:
- self.api.db.commit()