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