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我使用的是spring roo生成控制器.. 映射定义如下。Spring Roo多对多的搜索对象引用未保存的瞬态实例
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>();
的关系的工作,即填充这个表“用户”和表服务“Users_roles”,而不是真正管理局预计表。
数据的持久性完美,它是由Spring roo生成的方式, 控制器的用户以这种方式工作。
Users users = Users.fromJsonToUsers(json);
users.persist();
尝试通过使用关系的方法执行搜索时发生问题。
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,这个问题是我如何保存的方式,但不能肯定。 如果有人能够使用Force,我将不胜感激。
我所提到那样, 加两侧@ JoinTable,但如果我得标记mappedBy声明为 我得到运行时错误,如果你删除标签可以运行服务器。 但是错误仍然是暂时的对象在研究中爆炸并且不能使条目.. =/ 感谢您的回复.... – 2012-09-19 14:23:31