Question

有两个表：bb_players和bb_player_skills。玩家技能表与bb_players有一对一的关系，也是bb_players的外键。

执行此代码时出错：

Query q = em.createNamedQuery(PlayerSkill.DELETE_SKILL_BY_PLAYER_ID);
q.setParameter("playerID", playerID);
q.executeUpdate();

命名查询是：

 @NamedQuery(name = PlayerSkill.DELETE_SKILL_BY_PLAYER_ID, query = "DELETE FROM   PlayerSkill s " +
 " WHERE s.player.id = :playerID")

postgresql日志的错误是：

ERROR,42601,"syntax error at or near ""cross""",,,,,, 
 "delete from bb_player_skills cross join bb_players player1_ where id=$1",30,,""

我的命名查询是否错误，我应该如何重写？

Answer 1

根据您的Hibernate版本，这可能是一个开放的Hibernate问题。

来自：https://hibernate.atlassian.net/browse/HHH-7314

在需要通过Hibernate实体连接加入的条件下使用JPA Delete查询会为PostgreSQL生成无效的SQL。 PostgreSQL不能在DELETE查询的FROM子句中使用CROSS JOIN。

Answer 2

看起来它不是一对一的关系。从bb_players来看，它是一对多关系，从bb_player_skills它应该是多对一的关系。

Answer 3

万一其他人遇到相同的问题，这是一个解决方法。
可以重写命名查询以避免连接交叉。

@NamedQuery(name = "PlayerSkill.DELETE_SKILL_BY_PLAYER_ID", query = "DELETE FROM   PlayerSkill s " +
 " WHERE s.player IN (SELECT player FROM Player player where player.id=:playerID)")

Hibernate生成错误的语法sql

3 个答案: