系统所在建筑 ## 前置条件 1. 系统下有设备 2. 系统下的设备有所属建筑的关系 ## 依赖函数 Eq2Bd ## 计算流程 1. 通过 系统 --> 设备 --> 建筑 的间接关系, 获取系统所在建筑的关系 2. 结果存储在 r_sy_in_bd 表中 ## 函数 ~~~ -- 系统所在建筑 create or replace function public.rel_sy2bd(project_id character varying) returns boolean as $$ try: # 将下面对数据库的操作作为一个事务, 出异常则自动rollback with plpy.subtransaction(): delete_plan = plpy.prepare("delete from r_sy_in_bd where project_id = $1 and sign = 2", ["text"]) delete_plan.execute([project_id]) join_plan = plpy.prepare("select sy.sys_id, eq.building_id from r_sy_eq sy inner join equipment eq on sy.equip_id = eq.id where eq.project_id = $1 and sy.project_id = $1 and eq.building_id is not null", ["text"]) rel = join_plan.execute([project_id]) sy2bd = dict() for row in rel: sys = row['sys_id'] building = row['building_id'] if sys not in sy2bd: sy2bd[sys] = set() sys_set = sy2bd[sys] sys_set.add(building) for sid, sys_set in sy2bd.items(): for building in sys_set: plan = plpy.prepare("insert into r_sy_in_bd(sys_id, building_id, project_id, sign) values($1, $2, $3, 2)", ["text", "text", "text"]) plan.execute([sid, building, project_id]) except Exception as e: plpy.warning(e) return False else: return True $$ LANGUAGE 'plpython3u' VOLATILE; ~~~ ## 入参 1. 项目id ## 例子 select public.rel_sy2bd('Pj1101010015');