[英]Hibernate Query Language: Getting a SQL Syntax Error for my Query
我已经检查了许多相关问题,但那里的答案还没有解决我的问题。
我有通过 Hibernate 映射的实体User
和Character
。
@Entity
@Table(name = "user", uniqueConstraints = @UniqueConstraint(columnNames = { "username" }))
public class User {
@Id
@NotEmpty
@Column(name = "username")
private String username;
...
}
@Entity
@Table(name = "character", uniqueConstraints = @UniqueConstraint(columnNames = { "charId" }))
public class Character {
...
@NotEmpty
@ManyToOne
@JoinColumn(name = "username", referencedColumnName = "username")
private User user;
...
}
我想 select 所有具有特定用户名的字符,所以我使用的查询如下所示:
private final static String RETRIEVE_CHARACTERS_FOR_USER = "select c from Character as c inner join User as u where u.username = :paramUsername";
我的代码如下所示:
result = session.createQuery(RETRIEVE_CHARACTERS_FOR_USER, Character.class)
.setParameter(PARAM_USERNAME, user.getUsername()).getResultList();
我还尝试删除外键,使用String username
而不是User user
,只查询c.username
,所以我什至不确定问题是否与 Hibernate 相关......
我希望你能帮帮我: :)
这应该有效:
private final static String RETRIEVE_CHARACTERS_FOR_USER = "select c from Character c where c.user.username = :paramUsername";
好的,实际上'character'关键字确实有问题......将表名更改为'charac'并且效果很好。
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