Question

我有这个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();

我首先执行查询以从两个表中检索一些user_id。我想将这个user_id保存在一个变量中，然后在执行for循环后将此记录插入另一个表...

此代码不起作用。我得到了这个错误：

异常：为Database.get（）查询返回了多行

如何检索这多行，然后一次处理所有这些行？

谢谢大家。

Answer 1

解决方案是使用 self.db.query 而不是 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();

MySQL查询中的多行保存在数组结构中

1 个答案: