Question

我正在使用spring roo生成控制器.. 映射定义如下。

Class users 
    private String username;
    private String password;

 @ManyToMany( fetch = FetchType.EAGER) 
   @Cascade( org.hibernate.annotations.CascadeType.SAVE_UPDATE)
   @JoinTable(name = "user_roles", 
        joinColumns = { @JoinColumn(name = "users_id") }, 
        inverseJoinColumns = { @JoinColumn(name = "roles_id") })
    private Set<Authority> roles = new HashSet<Authority>();

Class Authority 
    private String roles
    private String descricao;

@ManyToMany( fetch = FetchType.EAGER ,  mappedBy = "roles") 
    @Cascade( org.hibernate.annotations.CascadeType.SAVE_UPDATE )
    private Set<Users> users = new HashSet<Users>();

关系正在运行，即填充此表“Users”和表服务“Users_roles”，而不是真正具有权限的表。

数据的持久性完美，就像Spring roo生成的那样，以这种方式控制器的用户可以工作。

    Users users = Users.fromJsonToUsers(json);
    users.persist();

尝试使用关系执行搜索方法时出现问题。

StringBuilder queryBuilder = new StringBuilder("SELECT o FROM Users AS o WHERE LOWER(o.username) LIKE LOWER(:username)  AND LOWER(o.password) LIKE LOWER(:password)");
        queryBuilder.append(" OR");
        for (int i = 0; i < roles.size(); i++) {
            if (i > 0) queryBuilder.append(" AND");
            queryBuilder.append(" :roles_item").append(i).append(" MEMBER OF o.roles");
        }
        TypedQuery<Users> q = em.createQuery(queryBuilder.toString(), Users.class);
        q.setParameter("username", username);
        int rolesIndex = 0;
        for (Authority _authority: roles) {
            q.setParameter("roles_item" + rolesIndex++, _authority);
        }
        q.setParameter("password", password);
        return q;

形成这样的查询：

(
  SELECT o
  FROM Users AS o 
  WHERE LOWER(o.username) LIKE LOWER(:username)
  AND LOWER(o.password) LIKE LOWER(:password)
  OR :roles_item0 MEMBER OF o.roles
)

例外：

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.Transi
entObjectException: **object references an unsaved transient instance - save the t
ransient instance before flushing:** br.teste.carro.domain.Authority; neste
d exception is java.lang.IllegalStateException: org.hibernate.TransientObjectExc
eption: object references an unsaved transient instance - save the transient ins
tance before flushing: br.teste.carro.domain.Authority

我怀疑问题是我如何保存但不确定。如果有人可以成为Force之一，我将不胜感激。

Answer 1

您需要在relp的两侧指定连接列，并且在另一侧应该反转它们：

Class users 
@JoinTable(name = "user_roles", 
    joinColumns = { @JoinColumn(name = "users_id") }, 
    inverseJoinColumns = { @JoinColumn(name = "roles_id") })


Class Authority 
@JoinTable(name = "user_roles", 
    joinColumns = { @JoinColumn(name = "roles_id") }, 
    inverseJoinColumns = { @JoinColumn(name = "users_id") })

Spring Roo很多对搜索对象引用了未保存的瞬态实例

1 个答案: