Java 如何改革或迭代sql结果集以构建映射

我正在尝试构建以下缓存-

ConcurrentMap<String, ConcurrentHashMap<TeamType, Team>>

这使我返回了正确的条目-但是当结果返回时，我有重复的行，因此很难迭代结果集并构建相关的pojo类

我正在寻找类似于

选择不同行的内容，其中

的条件保持不变，但我认为这是不允许的

有人能给我建议一些解决方法吗

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谢谢

如果在每个团队表中都有一个名为

team\u name

的字段，那么这样做如何：

select u.userid as User, 'Rugby' as TeamType, t.team_name as Team
from Users u
inner join RugbyTeam t on u.userid = t.userid

union all

select u.userid as User, 'Football' as TeamType, t.team_name as Team
from Users u
inner join FootballTeam t on u.userid = t.userid

union all

select u.userid as User, 'Rugby' as TeamType, t.team_name as Team
from Users u
inner join CricketTeam t on u.userid = t.userid

order by User;

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你得到的副本是什么？您可以在查询中指定DISTINCT。。。您的查询对where中通过in。。。您应该只按用户连接表。然后按用户分组我认为您应该按团队类型分别查询它们，这将使您的查询更简单，而且更符合逻辑，因为我猜您的表没有相同的列。

select u.userid as User, 'Rugby' as TeamType, t.team_name as Team
from Users u
inner join RugbyTeam t on u.userid = t.userid

union all

select u.userid as User, 'Football' as TeamType, t.team_name as Team
from Users u
inner join FootballTeam t on u.userid = t.userid

union all

select u.userid as User, 'Rugby' as TeamType, t.team_name as Team
from Users u
inner join CricketTeam t on u.userid = t.userid

order by User;