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
);
其中geoposition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遇到了这个异常:
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 hibernate 映射中删除地理定位时，它工作正常。 这是我的实体类的一部分:
@Column(name = "geoposition", nullable = false)
private PGpoint geoposition;
我使用的是不带 PostGIS 的 PostgreSQL 9.1。 我该如何解决这个问题才能使 hibernate 正常工作？
最佳答案
你可以做的一件事是，如果你不需要 DB 列上的点类型，你可以将其更改为 bytea
例如:
@Column(name = "geoposition", columnDefinition = "bytea")
public PGpoint getGeoposition()
{
return this.geoposition;
}
更好的方法是设置用户类型，这里有一个很好的例子: http://learningviacode.blogspot.de/2011/09/creating-hibernate-custom-type-1.html
这是我做的:
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;
}
这允许您保存和读取 postgresql 点列。我还没有一直测试它，但它应该能让你入门。
关于java - PGpoint Hibernate(反)序列化异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19754562/