Spring Data JPA 查询：MYSQL TO @QUERY答案

【问题标题】：Spring Data JPA Query: MYSQL TO @QUERYSpring Data JPA 查询：MYSQL TO @QUERY
【发布时间】：2021-08-27 22:53:12
【问题描述】：

谁能帮我把下面的mysql查询翻译成@Query？

Mysql-查询：

SELECT * 
FROM game JOIN game_teams ON game.id = game_teams.game_id
    JOIN team_members ON game_teams.teams_id = team_members.team_id
WHERE start_date IS NOT NULL AND end_date IS NOT NULL AND members_username = 'user2'

此查询检索的列多于游戏表中的列。也许我必须只选择游戏表中的列？

我需要这样的东西：

@Query("???")
Collection<Game> findUserPlayedGames(User user);

【问题讨论】：

标签： mysql sql spring spring-boot jpa

【解决方案1】：

如果您将用户名作为变量传递，请按照以下方式进行操作，并且您正在查询中加入一些列，因此使用返回类型作为 List

@Query(value ="SELECT * 
FROM game JOIN game_teams ON game.id = 
game_teams.game_id
JOIN team_members ON game_teams.teams_id = 
team_members.team_id
WHERE start_date IS NOT NULL AND end_date IS NOT NULL 
ANDD members_username = :username",   nativeQuery = true)

List<Object[]> 
findUserPlayedGamess(@Param("username)String userName);

【讨论】：

【解决方案2】：

@Query(value = "SELECT * "
        + " FROM game g JOIN game_teams gt ON g.id = gt.game_id "
        + "     JOIN team_members tm ON gt.teams_id = tm.team_id "
        + " WHERE g.start_date IS NOT NULL AND g.end_date IS NOT NULL AND tm.members_username = 'user2'",
        nativeQuery = true)
Collection<Game> findUserPlayedGames(User user);

【讨论】：