MySQL查询的多行结果保存为数组结构

Question

我有一段Python代码：

self.lock_tables("read", ['nets_permissions as n', 'devices_permissions as d'])
usrs = self.db.get("SELECT n.user_id FROM nets_permissions as n \
                    left join devices_permissions as d \
                    on n.user_id = d.user_id \
                    where d.user_id is null \
                    and n.network_id=%s and n.perm<>3", netid)
self.unlock_tables()

for usr in usrs:
    self.lock_tables("write", ['devices_permissions'])
    self.db.execute("INSERT devices_permissions SET \
                     user_id=%s, network_id=%s, device_id=%s, perm=%s",\
                     usr, netid, sensid, perm)
    self.unlock_tables();

我首先查询两个表，想要获取一些用户ID。我想把这些用户ID保存在一个变量里，然后再用一个循环把这些记录插入到另一个表中……

但是这段代码不管用。我遇到了这个错误：

异常：Database.get() 查询返回了多行数据

我该如何获取这些多行数据，然后一次性处理它们呢？

谢谢大家。

Answer 1

解决办法是用 self.db.query 代替 self.db.get！

self.lock_tables("read", ['nets_permissions as n', 'devices_permissions as d'])
usrs = self.db.query("SELECT n.user_id FROM nets_permissions as n \
                    left join devices_permissions as d \
                    on n.user_id = d.user_id \
                    where d.user_id is null \
                    and n.network_id=%s and n.perm<>3", netid)
self.unlock_tables()

for usr in usrs:
    self.lock_tables("write", ['devices_permissions'])
    self.db.execute("INSERT devices_permissions SET \
                     user_id=%s, network_id=%s, device_id=%s, perm=%s",\
                     usr['user_id'], netid, sensid, perm)
    self.unlock_tables();