[英]How to map the result set of a JPA NativeQuery to a POJO using SqlResultSetMapping
[英]Map NativeQuery to POJO
我有一个NativeQuery,我想映射到POJO。
我尝试了以下但它以无限循环结束。
public synchronized List<FreeIP> getFirstFreeHost() {
String q = "SELECT i.subnet, h.ip_host FROM ip_addresses i join hosts h on i.id = h.ip_addresses_id ORDER BY i.subnet, h.ip_host";
this.entityManager = this.entityManagerFactory.createEntityManager();
Query query = this.entityManager.createNativeQuery(q);
List<Object[]> rows = query.getResultList();
List<FreeIP> result = new ArrayList<>();
for (Object[] row : rows) {
result.add(new FreeIP((String) row[0], (String) row[1]));
}
return result;
}
看看QLRM: https : //github.com/simasch/qlrm
然后你可以这样做:
JpaResultMapper jpaResultMapper = new JpaResultMapper();
Query q = em.createNativeQuery("SELECT i.subnet, h.ip_host FROM ip_addresses i join hosts h on i.id = h.ip_addresses_id ORDER BY i.subnet, h.ip_host");
List<EmployeeTO> list = jpaResultMapper.list(q, FreeIP.class);
确保FreeIP具有一个构造函数,该构造函数接受查询的所有参数。
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