code: def execute(self, conn, acquisition_era_name,end_date, transaction = False):
          	
  	if not conn:
  	    dbsExceptionHandler("dbsException-failed-connect2host", "dbs/dao/Oracle/AcquisitionEra/updateEndDate expects db connection from upper layer.", self.logger.exception)
          binds = { "acquisition_era_name" :acquisition_era_name  , "end_date" : end_date  }
          result = self.dbi.processData(self.sql, binds, conn, transaction)
docs: for a given block_id