@NamedQuery
Vytvořil jsem následující @NamedQuery
na Organization
třída entity.
@NamedQuery(name = "query", query = "SELECT DISTINCT o " +
"FROM Organization o, User u " +
"JOIN o.roles oRole " +
"JOIN u.roles uRole " +
"WHERE oRole.id = uRole.id AND u.id = :uId")
public class Organization { ...
(Použil jsem standardní anotace JPA, ale můj poskytovatel byl Hibernate.)
Test
Toto je test, který jsem provedl.
EntityManager em = ...
TypedQuery<Organization> q = em.createNamedQuery("query", Organization.class);
q.setParameter("uId", 1); // try it with 1L if Hibernate barks about it
for (Organization o : q.getResultList())
System.out.println(o.name);
Pomocí níže uvedených tabulek a ukázkových dat to vyjde
A
B
Zjistěte, zda vám to funguje.
Tabulky
CREATE TABLE `organization` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE `role` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`description` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`organization_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
);
CREATE TABLE `user_has_role` (
`user_id` int(11) NOT NULL DEFAULT '0',
`role_id` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`user_id`,`role_id`)
);
ALTER TABLE `role` ADD CONSTRAINT `cst_organization_id`
FOREIGN KEY `fk_organiztaion_id` (`organization_id`)
REFERENCES `organization` (`id`);
(použil jsem trochu jinak než vaše , ale na tom by nemělo příliš záležet.)
Ukázková data
`organization`
+----+------+
| id | name |
+----+------+
| 1 | A |
| 2 | B |
+----+------+
`role`
+----+------+-------------+-----------------+
| id | name | description | organization_id |
+----+------+-------------+-----------------+
| 1 | A | a | 1 |
| 2 | B | b | 1 |
| 3 | C | c | 2 |
+----+------+-------------+-----------------+
`user`
+----+
| id |
+----+
| 1 |
| 2 |
| 3 |
+----+
`user_has_role`
+---------+---------+
| user_id | role_id |
+---------+---------+
| 1 | 1 |
| 1 | 2 |
| 1 | 3 |
| 2 | 1 |
| 3 | 1 |
| 3 | 3 |
+---------+---------+