Hibernate 查詢語言：為我的查詢獲取 SQL 語法錯誤

Question

我已經檢查了許多相關問題，但那里的答案還沒有解決我的問題。

我有通過 Hibernate 映射的實體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 所有具有特定用戶名的字符，所以我使用的查詢如下所示：

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

我的代碼如下所示：

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

我還嘗試刪除外鍵，使用String username而不是User user ，只查詢c.username ，所以我什至不確定問題是否與 Hibernate 相關......

我希望你能幫幫我： ：）

Answer 1

這應該有效：

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

Answer 2

好的，實際上'character'關鍵字確實有問題......將表名更改為'charac'並且效果很好。