java - Hibernate查询语言: Getting a SQL Syntax Error for my Query

Question

我已经检查了很多相关问题，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;

    ...
}

我想选择具有特定用户名的所有字符，因此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并只查询c.username，所以我我什至不确定问题是否与 Hibernate 有关...

希望你能帮助我! :)

Answer 1

这应该有效:

private final static String RETRIEVE_CHARACTERS_FOR_USER = "select c from Character c where c.user.username = :paramUsername";