我正在研究 Spring Boot 项目，并且疯狂地尝试正确映射MySql DB的点字段(它是MariaDB，但是同一件事...)。
为了检索数据，我在上使用了 Spring Data JPA ，在Hibernate 5 上。
我的数据库上有这个住宿表:
Field Type Null Key Default Extra
id bigint(20) unsigned NO PRI NULL auto_increment
user_id bigint(20) unsigned NO MUL NULL
accomodation_name varchar(255) NO NULL
description text NO NULL
nation varchar(255) NO NULL
region varchar(255) NO NULL
province varchar(255) NO NULL
city varchar(255) NO NULL
geographical_position point NO NULL
stars int(10) NO NULL
accomodation_typological_id bigint(20) unsigned YES NULL
accomodation_service_id bigint(20) unsigned YES NULL
phone varchar(255) YES NULL
mobile varchar(255) YES NULL
fax varchar(255) YES NULL
email varchar(255) YES NULL
time_stamp datetime YES NULL
如您所见，该表包含字段 geo_position ，其中点作为数据类型(支持MySql opengGIS实现)。
上一个表由此Accomodation类映射:
import com.vividsolutions.jts.geom.Point;
import org.hibernate.annotations.Type;
import javax.persistence.*;
import java.io.Serializable;
import java.math.BigInteger;
import java.util.List;
/**
* Created by Yngve on 30/09/16.
*/
@Entity
@Table(name = "accomodation")
public class Accomodation implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
/*@ManyToOne
private Users users;
*/
@OneToMany(mappedBy = "accomodation")
private List<Room> rooms;
@Column(name = "accomodation_name")
private String name;
@Column(name = "description")
@Type(type="text")
private String description;
private String phone;
private String mobile;
private String fax;
private String email;
private Integer stars;
@Column(name = "geographical_position", columnDefinition="Point")
private Point location;
public Accomodation(){
}
// GETTER AND SETTER METHODS
}
如您所见，表上的前一个点字段由我的Java类中的该字段映射:
@Column(name = "geographical_position", columnDefinition="Point")
private Point location;
在前面的代码片段中，我还插入了Point提供的使用过的实现的导入(我在一些教程中找到了它):
import com.vividsolutions.jts.geom.Point;
但是我绝对不确定这是必须使用的正确的类。
这是我的DAO类，用于实现Spring Data JPA查询(该查询由Spring Data JPA使用方法签名生成):
@Repository
@Transactional(propagation = Propagation.MANDATORY)
public interface AccomodationDAO extends JpaRepository<Accomodation, Long> {
//@Query("FROM Accomodation WHERE id = :id")
Accomodation findById(@Param("id") Long id);
}
问题是使用此 JUnuit 测试方法测试以前的DAO方法:
@Test
public void placeSearcherControllerTest() {
System.out.println("placeSearcherControllerTest START");
Accomodation accomodation = accomodationDAO.findById(6L);
System.out.println("placeSearcherControllerTest END");
}
我在IntelliJ控制台中获得以下错误消息:
Hibernate: select accomodati0_.id as id1_0_, accomodati0_.description as descript2_0_, accomodati0_.email as email3_0_, accomodati0_.fax as fax4_0_, accomodati0_.geographical_position as geograph5_0_, accomodati0_.mobile as mobile6_0_, accomodati0_.accomodation_name as accomoda7_0_, accomodati0_.phone as phone8_0_, accomodati0_.stars as stars9_0_ from accomodation accomodati0_ where accomodati0_.id=?
org.springframework.orm.jpa.JpaSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:333)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy112.findById(Unknown Source)
at com.betriuvis.controller.test.PlaceSearcherControllerTest.placeSearcherControllerTest(PlaceSearcherControllerTest.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
Caused by: org.hibernate.type.SerializationException: could not deserialize
at org.hibernate.internal.util.SerializationHelper.doDeserialize(SerializationHelper.java:243)
at org.hibernate.internal.util.SerializationHelper.deserialize(SerializationHelper.java:287)
at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.fromBytes(SerializableTypeDescriptor.java:138)
at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:113)
at org.hibernate.type.descriptor.java.SerializableTypeDescriptor.wrap(SerializableTypeDescriptor.java:27)
at org.hibernate.type.descriptor.sql.VarbinaryTypeDescriptor$2.doExtract(VarbinaryTypeDescriptor.java:60)
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:238)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:234)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:224)
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:300)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2738)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1729)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1655)
at org.hibernate.loader.Loader.getRow(Loader.java:1544)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:727)
at org.hibernate.loader.Loader.processResultSet(Loader.java:972)
at org.hibernate.loader.Loader.doQuery(Loader.java:930)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)
at org.hibernate.loader.Loader.doList(Loader.java:2617)
at org.hibernate.loader.Loader.doList(Loader.java:2600)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2429)
at org.hibernate.loader.Loader.list(Loader.java:2424)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1326)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:529)
at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getSingleResult(CriteriaQueryTypeQueryAdapter.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:372)
at com.sun.proxy.$Proxy119.getSingleResult(Unknown Source)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:210)
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:82)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:114)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:104)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:482)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
... 36 more
Caused by: java.io.StreamCorruptedException: invalid stream header: 00000000
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:806)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:309)
at org.hibernate.internal.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:299)
at org.hibernate.internal.util.SerializationHelper.doDeserialize(SerializationHelper.java:218)
... 86 more
问题当然是由住宿类上的此映射引起的:
@Column(name = "geographical_position", columnDefinition="Point")
private Point location;
因为如果我从实体类中删除此字段，我也不会异常(exception)，并且可以正确检索住宿对象(不包含位置字段)。
查看先前的错误输出，我可以看到Hibernate生成了此SQL查询:
select accomodati0_.id as id1_0_, accomodati0_.description as descript2_0_, accomodati0_.email as email3_0_, accomodati0_.fax as fax4_0_, accomodati0_.geographical_position as geograph5_0_, accomodati0_.mobile as mobile6_0_, accomodati0_.accomodation_name as accomoda7_0_, accomodati0_.phone as phone8_0_, accomodati0_.stars as stars9_0_ from accomodation accomodati0_ where accomodati0_.id=6
直接在我的数据库上执行的操作可以获得正确的记录。作为上一个点字段的内容，我可以看到这个值 [GEOMETRY-25 B] (这意味着 25 B 吗？)，它是一个名为accomodation- geo_position.bin 的文件。
在数据库上执行此其他查询:
select id, AsText(geographical_position) from accomodation where id = 6
我正确遵守了我的 geo_position 字段中包含的坐标，实际上在获得的查询输出中是这样:
id AsText(geographical_position)
--------------------------------------
6 POINT(41.729086 12.278478)
因此，将数据正确存储到点作为数据类型的地理位置中。
因此，问题与地理位置字段到我的实体类的点位置的映射有关。
在stackoverflow上搜索，我看来 org.hibernate.type.SerializationException:当Hibernate无法将字段的值放到特定的Java对象中时，无法反序列化异常，这有些麻烦，所以我怀疑 import com.vividsolutions.jts.geom.Point 使用的类来映射点数据库字段(也许这是旧版本的Hibrnate Spatial上使用的此类还是类似的东西？)
也许它可能是 Spring Boot 配置问题，所以我在这里还放置了代表我的整个应用程序配置的 appliction.properties 文件:
#No auth protected
endpoints.shutdown.sensitive=true
#Enable shutdown endpoint
endpoints.shutdown.enabled=true
logging.file=BeTriviusController.log
logging.level.org.springframework.web=DEBUG
logging.level.org.hibernate=ERROR
# Thymeleaf
spring.thymeleaf.cache:false
# DATABASE CONFIG ----------------------------------------------------------------------------------------------------
spring.datasource.url = jdbc:mysql://localhost:3306/betriviustest
spring.datasource.username = root
spring.datasource.password =
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate4.SpringSessionContext
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update, validate)
spring.jpa.hibernate.ddl-auto = validate
#spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
也许与Hibernate Spatial配置有关？ (看来我有点奇怪，因为据我所知，它直接包含在Hibernate 5中，而不再是要添加和配置的外部项目)。
最后，这是我的 pom.xml 文件，其中包含所有使用的库:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>BeTriviusController</groupId>
<artifactId>BeTriviusController</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<springboot.version>1.4.1.RELEASE</springboot.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-test</artifactId>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>RELEASE</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-spatial</artifactId>
<version>5.0.1.Final</version>
<!--<version>4.0</version>-->
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
那么，怎么了？我想念什么？如何解决此问题，并正确地将实体类的Point位置与以point为数据类型的geo_position表字段上的值进行映射？
最佳答案
我遇到了完全相同的问题，并且能够提出解决方案。因为，正如您最初指出的那样，mysql函数ST_ASTEXT(column_name)可以完美地工作，这意味着数据肯定存储正确。
我意识到了这一点，并决定在此基础上构建解决方案。这是我的@Entity的摘录。
@Entity
@Table(name = "formEntryData")
public class FormEntryData {
...
@Formula("ST_ASTEXT(data_geo)")
private String dataGeo;
public Geometry getDataGeo() {
try {
WKTReader reader = new WKTReader();
return reader.read(dataGeo);
} catch (ParseException ex) {
return null;
}
}
}
然后您需要做的是设置Jackson的
ObjectMapper，以便可以将com.vividsolutions.jts.geom.*(即Geometry，Point等)序列化为JSON。为此，请将此依赖项添加到您的依赖项管理器中(我使用过maven):
<dependency>
<groupId>com.bedatadriven</groupId>
<artifactId>jackson-datatype-jts</artifactId>
<version>2.3</version>
</dependency>
然后，您只需要使用Spring Boot的Configuration机制进行连接即可。
@Configuration
public class JacksonConfig {
@Bean
public JtsModule jtsModule() {
return new JtsModule();
}
}
瞧!现在，您可以从mysql中读取几何类型并输出可接受的GeoJSON格式!希望能有所帮助!