def execute(self, conn, daoinput, transaction = False):
        """
	    required keys:
	    migration_status, migration_request_id
        """	
        if not conn:
	    dbsExceptionHandler("dbsException-failed-connect2host", "Oracle/MigrationRequests/UpdateRequestStatus. Expects db connection from upper layer.", 
                                self.logger.exception)
        if daoinput['migration_status'] == 1:
           sql = self.sql2 
        elif daoinput['migration_status'] == 2:
            sql = self.sql + " and MIGRATION_STATUS = 1 "
        elif daoinput['migration_status'] == 3:
            sql = self.sql3 + " and MIGRATION_STATUS = 1 " 
        else:
            dbsExceptionHandler("dbsException-conflict-data", "Oracle/MigrationRequest/UpdateRequestStatus. Expected migration status to be 1, 2 or 3",
                                self.logger.exception)
        
	result = self.dbi.processData(sql, daoinput, conn, transaction)