Bases: congress.datasources.datasource_driver.PollingDataSourceDriver, congress.datasources.datasource_driver.ExecutionDriver
Overwrite ExecutionDriver.execute().
Returns a dictionary of table schema.
The dictionary mapping tablenames to the list of column names for that table. Both tablenames and columnnames are strings.
Called when it is time to pull new data from this datasource.
Sets self.state[tablename] = <set of tuples of strings/numbers> for every tablename exported by this datasource.