Spring Hibernate4、JPA2和HSQL，无法按ID查询

我有一个名为服务的域对象，其中包含一个id字段：

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "id", nullable = false)
private Integer id;

@Column(name = "type")
private Service.ServiceTypes serviceType;

在我的DAO实现中，我可以轻松地按服务类型查询：

@Override
    public Set<Service> queryDatabaseByServiceType(ServiceTypes serviceType) {
        logger.debug("Querying the database by service type " + serviceType.toString());
        return new HashSet<Service>(super.entityManager.createQuery("from Service s where s.type = :serviceType").setParameter("serviceType", serviceType).getResultList());
    }

对于所有这些不同类型的查询，以下是日志输出：

DEBUG: service.impl.ServiceServiceImpl - Querying the database by service id 2
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 1
INFO : service.impl.ServiceServiceImpl - results list from id query: 0
Hibernate: select service0_.service_id as service1_0_0_, service0_.description as descript2_0_0_, service0_.name as name0_0_, service0_.type as type0_0_, service0_.tmodel as tmodel0_0_, service0_.uddi_id as uddi6_0_0_, service0_.url as url0_0_, service0_.version as version0_0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 1
Hibernate: select service0_.service_id as col_0_0_ from services service0_
INFO : service.impl.ServiceServiceImpl - z1 count: 0
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=1
INFO : service.impl.ServiceServiceImpl - results1 from id query: 0
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=2
INFO : service.impl.ServiceServiceImpl - results2 from id query: 0
Hibernate: select service0_.service_id as service1_0_0_, service0_.description as descript2_0_0_, service0_.name as name0_0_, service0_.type as type0_0_, service0_.tmodel as tmodel0_0_, service0_.uddi_id as uddi6_0_0_, service0_.url as url0_0_, service0_.version as version0_0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 2

---

我们在项目中使用JPA2，但它没有这种问题，如何更改“公共服务queryDatabaseByServiceId（intID）{”在我看来，在hibernate中，将id类型改为整数将是一个更好的选择。让我知道会发生什么。另一件事是更改log4j以打印sql以及检查它的参数值

<logger name="org.hibernate.type">
    <level value="trace"></level>
</logger>
<logger name="org.hibernate.sql">
    <level value="trace"></level>
</logger>

不知道，但是为什么不直接使用

Service s=em.find（Service.class，id）

？我确实尝试过——也没有结果……好像它存储的ID与预期的不同。我已经尝试过使用Integer，但仍然没有结果。我将ID的表名更改为service_ID，只是为了看看是否有一些奇怪的注释。下面是hibernate:hibernate:create table services的创建行（服务id整数不为空，描述变量字符（255），名称变量字符（255），类型整数，tmodel变量字符（255），uddi id变量字符（255），url变量字符（255），版本变量字符（255），主键（服务id））我可以将数据库写入一个文件而不是内存中，以便直接查看表/列/值吗？不可以。实际上，它只是关于log4j，您添加了我粘贴的代码，然后就可以看到参数值。当我运行查询时，我可以在日志中看到：TRACE:org.hibernate.type.descriptor.sql.BasicBinder-binding参数[1]为[INTEGER]-2，但是它仍然返回零结果。当我按服务类型查询时，它返回结果：{“services”：[{“id”：2，“serviceType”：“x”……好吧，结果是我犯了一个大错误——我将结果存储在内存和数据库中的映射中。我认为正在工作的查询实际上是使用映射，而不是查询数据库。结果是，所有查询都返回0项，包括“findAll（）”。我在这里提出了一个新问题

Service ser = super.entityManager.find(Service.class, new Integer(1));

List z1 = super.entityManager.createQuery("select s.id from Service s").getResultList();

List results1 = super.entityManager.createQuery("SELECT s FROM Service s WHERE id = 1").getResultList();

List<Service> results = super.entityManager.createQuery("from Service as s where s.id = :id").setParameter("id", new Integer(1)).getResultList();

return new HashSet<Service>(super.entityManager.createQuery("from Service s where s.type = :serviceType").setParameter("serviceType", serviceType).getResultList());

{"services":[{"id":2,"serviceType":"x",.....

DEBUG: service.impl.ServiceServiceImpl - Querying the database by service id 2
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 1
INFO : service.impl.ServiceServiceImpl - results list from id query: 0
Hibernate: select service0_.service_id as service1_0_0_, service0_.description as descript2_0_0_, service0_.name as name0_0_, service0_.type as type0_0_, service0_.tmodel as tmodel0_0_, service0_.uddi_id as uddi6_0_0_, service0_.url as url0_0_, service0_.version as version0_0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 1
Hibernate: select service0_.service_id as col_0_0_ from services service0_
INFO : service.impl.ServiceServiceImpl - z1 count: 0
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=1
INFO : service.impl.ServiceServiceImpl - results1 from id query: 0
Hibernate: select service0_.service_id as service1_0_, service0_.description as descript2_0_, service0_.name as name0_, service0_.type as type0_, service0_.tmodel as tmodel0_, service0_.uddi_id as uddi6_0_, service0_.url as url0_, service0_.version as version0_ from services service0_ where service0_.service_id=2
INFO : service.impl.ServiceServiceImpl - results2 from id query: 0
Hibernate: select service0_.service_id as service1_0_0_, service0_.description as descript2_0_0_, service0_.name as name0_0_, service0_.type as type0_0_, service0_.tmodel as tmodel0_0_, service0_.uddi_id as uddi6_0_0_, service0_.url as url0_0_, service0_.version as version0_0_ from services service0_ where service0_.service_id=?
TRACE: org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [INTEGER] - 2

<logger name="org.hibernate.type">
    <level value="trace"></level>
</logger>
<logger name="org.hibernate.sql">
    <level value="trace"></level>
</logger>