PGpoint Hibernate（反）序列化异常

Question

在我的数据库中，我有这张表：

CREATE TABLE base_station
(
    MCC INT NOT NULL,
    MNC INT NOT NULL,
    LAC INT NOT NULL,
    CID INT NOT NULL,
    type TEXT NOT NULL,
    geoposition point NOT NULL,
    city TEXT,
    date_created DATE,
    PRIMARY KEY ( CID, MNC, LAC, MCC ),
    FOREIGN KEY ( MNC, LAC, MCC ) REFERENCES location_area ( MNC, LAC, MCC ) ON DELETE CASCADE DEFERRABLE
);

地理位置是 POINT 类型。我读过 postgresql POINT 应该映射到 PGpoint，但是在尝试反序列化数据时，我得到了这个异常：

org.hibernate.type.SerializationException: could not deserialize
    org.hibernate.internal.util.SerializationHelper.doDeserialize(SerializationHelper.java:262)
    org.hibernate.internal.util.SerializationHelper.deserialize(SerializationHelper.java:306)
    org.hibernate.type.descriptor.java.SerializableTypeDescriptor.fromBytes(SerializableTypeDescriptor.java:140)
    org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:121)
    org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:44)
    org.hibernate.type.descriptor.sql.VarbinaryTypeDescriptor$2.doExtract(VarbinaryTypeDescriptor.java:67)
    org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64)
    org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:261)
    org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:257)
    org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:247)
    org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:332)
    org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2912)
    org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1673)
    org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1605)
    org.hibernate.loader.Loader.getRow(Loader.java:1505)
    org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:713)
    org.hibernate.loader.Loader.processResultSet(Loader.java:943)
    org.hibernate.loader.Loader.doQuery(Loader.java:911)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
    org.hibernate.loader.Loader.doList(Loader.java:2526)
    org.hibernate.loader.Loader.doList(Loader.java:2512)
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342)
    org.hibernate.loader.Loader.list(Loader.java:2337)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1269)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
    pl.elka.networkwatcher.dao.implemented.HibernateDAOImpl.getList(HibernateDAOImpl.java:49)
    pl.elka.networkwatcher.managers.BaseStationManager.findAll(BaseStationManager.java:25)
    pl.elka.networkwatcher.managers.BaseStationManager$$FastClassByCGLIB$$bbbd79f1.invoke(<generated>)
    org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:698)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)
    pl.elka.networkwatcher.managers.BaseStationManager$$EnhancerByCGLIB$$30a97444.findAll(<generated>)
    pl.elka.networkwatcher.controllers.MainController.stations(MainController.java:61)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:439)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:427)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

当我从休眠映射中删除地理位置时，它工作正常。 这是我的实体类的一部分：

@Column(name = "geoposition", nullable = false)
private PGpoint geoposition;

我正在使用没有 PostGIS 的 PostgreSQL 9.1。 如何解决此问题以使休眠正常工作？

Answer 1

也许你还需要将方言设置为 PostGIS：hibernate.dialect=org.hibernate.spatial.dialect.postgis.PostgisDialect

Answer 2

我假设您使用的是 PostgreSQL point 类型？如果是这样，那么看起来 Hibernate 不理解这种类型，或者它没有在 JDBC 驱动程序中定义。

我在使用 Hibernate Spatial 时遇到了类似的问题，但我没有找到 postgis.jar。

我可能会首先尝试直接使用 JDBC 来处理 PostgreSQL point 类型。如果这可以工作，那么看看 Hibernate。

Answer 3

您可以做的一件事是，如果您不需要 DB 列上的点类型，您可以将其更改为 bytea

例如：

@Column(name = "geoposition", columnDefinition = "bytea")
public PGpoint getGeoposition()
{ 
     return this.geoposition; 
}

一个更好的方法是设置一个用户类型，在这里你可以找到一个很好的例子： http://learningviacode.blogspot.de/2011/09/creating-hibernate-custom-type-1.html

这是我所做的：

package testapplication;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
import org.postgresql.geometric.PGpoint;


public class PointUserType implements UserType
{

    @Override
    public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner)
        throws HibernateException, SQLException
    {
    assert names.length == 1;
    if (resultSet.wasNull())
    {
        return null;
    }
        final PGpoint point = new PGpoint(resultSet.getObject(names[0]).toString());
        return point;
    }

    @Override
    public void nullSafeSet(PreparedStatement statement, Object value, int index)
        throws HibernateException, SQLException
    {
        statement.setObject(index, value);
    }

    @Override
    public int[] sqlTypes()
    {
        return new int[]
        {
            Types.VARCHAR
        };
    }

    @SuppressWarnings("rawtypes")
    @Override
    public Class returnedClass()
    {
        return PGpoint.class;
    }

    @Override
    public boolean equals(Object o, Object o1) throws HibernateException
    {
        boolean isEqual = false;
        if (o == o1)
        {
                isEqual = true;
        }
        if (o == null || o1 == null)
        {
            isEqual = false;
        }
        else
        {
            isEqual = o.equals(o1);
        }
        return isEqual;
   }

    @Override
    public int hashCode(Object o) throws HibernateException
    {
        return o.hashCode();
    }

    @Override
    public Object deepCopy(Object o) throws HibernateException
    {
        return (Serializable) o;
    }

    @Override
    public boolean isMutable()
    {
        return true;
    }

    @Override
    public Serializable disassemble(Object o) throws HibernateException
    {
        return (Serializable) o;
    }

    @Override
    public Object assemble(Serializable srlzbl, Object o) throws HibernateException
    {
        return srlzbl;
    }

    @Override
    public Object replace(Object o, Object o1, Object o2) throws HibernateException
    {
        return this;
    }

}

您的列定义应如下所示：

@Column(name = "geoposition", columnDefinition = "point")
@Type(type = "testapplication.PointUserType")
public PGpoint getGeoposition()
{
    return geoposition;
}

这允许您保存到 postgresql 点列并从中读取。我没有一直测试它，但它应该能让你开始。