Hibernate 查询语言：为我的查询获取 SQL 语法错误

Question

I already checked many related questions but the answers there did not fix my problem yet.

I have entities User and Character that are mapped via Hibernate.

@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;

    ...
}

I want to select all characters that have a specific username, so the query that I use looks like this:

private final static String RETRIEVE_CHARACTERS_FOR_USER = "select c from Character as c inner join User as u where u.username = :paramUsername";

and my Code looks like this:

result = session.createQuery(RETRIEVE_CHARACTERS_FOR_USER, Character.class)
                .setParameter(PARAM_USERNAME, user.getUsername()).getResultList();

I also tried to remove the foreign key, use String username instead of User user and just query for c.username , so I am not even sure if the problem is Hibernate related...

I hope you can help me: :)

Answer 1

This should work:

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

Answer 2

Ok, actually it was really a problem with the 'character' keyword... changed the table name to 'charac' and it worked fine.