我有一个实体 LocationsCoordinates 用于在具有唯一位置和国家(制作复合主键)的数据库中保存位置坐标，其定义如下:
@Entity
@Table(name = "LOCATIONS_COORDINATES")
@IdClass(LocationsCoordinatesPK.class)
public class LocationsCoordinates implements Serializable {
private static final long serialVersionUID = -4580217081464519853L;
@Id
@Column(name = "LOCATION")
String location;
@Id
@Column(name = "COUNTRY")
String country;
@Column(name = "LATITUDE")
Double latitude;
@Column(name = "LONGITUDE")
Double longitude;
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public Double getLatitude() {
return latitude;
}
public void setLatitude(Double latitude) {
this.latitude = latitude;
}
public Double getLongitude() {
return longitude;
}
public void setLongitude(Double longitude) {
this.longitude = longitude;
}
}
--
public class LocationsCoordinatesPK implements Serializable
{
private static final long serialVersionUID = -4675306358956719620L;
String location;
String country;
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
例如，在 jpa 中批量插入 utf-8 字符集中带有坐标的位置
public class SampleDAO {
protected EntityManager entityManager;
@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
this. entityManager = entityManager;
}
public void saveCoordinates(){
ArrayList<LocationsCoordinates> coordinates = new ArrayList<LocationsCoordinates>();
LocationsCoordinates coordinate = new LocationsCoordinates();
coordinate.setLocation("Krakow");
coordinate.setCountry("Poland");
coordinate.setLatitude(25.25817);
coordinate.setLongitude(55.30472);
coordinates.add(coordinate);
coordinate = new LocationsCoordinates();
coordinate.setLocation("Kraków");
coordinate.setCountry("Poland");
coordinate.setLatitude(25.25817);
coordinate.setLongitude(55.30472);
coordinates.add(coordinate);
save(coordinates);
}
@Transactional
public <LocationsCoordinates> List<LocationsCoordinates > save(List<LocationsCoordinates > list) {
List<LocationsCoordinates > returnList = new ArrayList<LocationsCoordinates >();
for(LocationsCoordinates ob : list){
returnList.add(entityManager.merge(ob));
}
return returnList;
}
}
}
在调用保存函数时，出现以下异常
2013-10-09 19:42:41,892 [ERROR ][pool-1-thread-1] JDBCExceptionReporter - Duplicate entry 'Poland-Kraków' for key 'PRIMARY'
2013-10-09 19:42:41,984 [ERROR ][pool-1-thread-1] TaskUtils$LoggingErrorHandler - Unexpected error occurred in scheduled task.
org.springframework.dao.DataIntegrityViolationException: could not insert: [com.reppify.core.dto.LocationsCoordinates]; SQL [insert into LOCATIONS_COORDINATES (LATITUDE, LONGITUDE, COUNTRY, LOCATION) values (?, ?, ?, ?)]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [com.reppify.core.dto.LocationsCoordinates]
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:643)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:104)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:516)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:392)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy28.save(Unknown Source)
at com.reppify.accenture.scoring.ScoreConnections.scoreConnections(ScoreConnections.java:308)
at com.reppify.parser.job.accenture.JobLoader.synchronizeJob(JobLoader.java:155)
at com.reppify.parser.job.accenture.JobLoader.startJobLoader(JobLoader.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:64)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:53)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.exception.ConstraintViolationException: could not insert: [com.reppify.core.dto.LocationsCoordinates]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2454)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2874)
at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:76)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:512)
... 25 more
Caused by: java.sql.BatchUpdateException: Duplicate entry 'Poland-Kraków' for key 'PRIMARY'
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2024)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1449)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
at org.hibernate.jdbc.BatchingBatcher.addToBatch(BatchingBatcher.java:56)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2434)
... 37 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'Poland-Kraków' for key 'PRIMARY'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)
at com.mysql.jdbc.Util.getInstance(Util.java:382)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1976)
... 41 more
因为 "Krakow" 和 "Kraków" 是不同的字符串值，所以它们不被认为是重复的，但正如我们在异常中看到的那样，它们被认为是相同的值.请帮忙。
最佳答案
尝试使用 utf8_general_ciutf8_bin 作为 MySQL 列的排序规则。
这好像不是Java的问题，而是MySQL的问题。
查找有关排序规则的更多信息 here
这是正确的CREATE TABLE
CREATE TABLE `locations_coordinates` (
`COUNTRY` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
`LOCATION` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
`LATITUDE` double DEFAULT NULL,
`LONGITUDE` double DEFAULT NULL,
PRIMARY KEY (`COUNTRY`,`LOCATION`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
关于java - 插入 "Duplicate entry ... for key PRIMARY"和 "Krakow"时为 "Kraków"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19288550/
我正在尝试测试是否存在表单。我是Rails新手。我的new.html.erb_spec.rb文件的内容是:require'spec_helper'describe"messages/new.html.erb"doit"shouldrendertheform"dorender'/messages/new.html.erb'reponse.shouldhave_form_putting_to(@message)with_submit_buttonendendView本身，new.html.erb，有代码:当我运行rspec时，它失败了:1)messages/new.html.erbshou
我在从html页面生成PDF时遇到问题。我正在使用PDFkit。在安装它的过程中，我注意到我需要wkhtmltopdf。所以我也安装了它。我做了PDFkit的文档所说的一切......现在我在尝试加载PDF时遇到了这个错误。这里是错误:commandfailed:"/usr/local/bin/wkhtmltopdf""--margin-right""0.75in""--page-size""Letter""--margin-top""0.75in""--margin-bottom""0.75in""--encoding""UTF-8""--margin-left""0.75in""-
为了将Cucumber用于命令行脚本，我按照提供的说明安装了arubagem。它在我的Gemfile中，我可以验证是否安装了正确的版本并且我已经包含了require'aruba/cucumber'在'features/env.rb'中为了确保它能正常工作，我写了以下场景:@announceScenario:Testingcucumber/arubaGivenablankslateThentheoutputfrom"ls-la"shouldcontain"drw"假设事情应该失败。它确实失败了，但失败的原因是错误的:@announceScenario:Testingcucumber/ar
我真的很习惯使用Ruby编写以下代码:my_hash={}my_hash['test']=1Java中对应的数据结构是什么？ 最佳答案 HashMapmap=newHashMap();map.put("test",1);我假设？ 关于java-等价于Java中的RubyHash，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.com/questions/22737685/
我遵循MichaelHartl的“RubyonRails教程:学习Web开发”，并创建了检查用户名和电子邮件长度有效性的测试(名称最多50个字符，电子邮件最多255个字符)。test/helpers/application_helper_test.rb的内容是:require'test_helper'classApplicationHelperTest在运行bundleexecraketest时，所有测试都通过了，但我看到以下消息在最后被标记为错误:ERROR["test_full_title_helper",ApplicationHelperTest,1.820016791]test
我正在尝试从Postgresql表(table1)中获取数据，该表由另一个相关表(property)的字段(table2)过滤。在纯SQL中，我会这样编写查询:SELECT*FROMtable1JOINtable2USING(table2_id)WHEREtable2.propertyLIKE'query%'这工作正常:scope:my_scope,->(query){includes(:table2).where("table2.property":query)}但我真正需要的是使用LIKE运算符进行过滤，而不是严格相等。然而，这是行不通的:scope:my_scope,->(que
我正在尝试编写一个将文件上传到AWS并公开该文件的Ruby脚本。我做了以下事情:s3=Aws::S3::Resource.new(credentials:Aws::Credentials.new(KEY,SECRET),region:'us-west-2')obj=s3.bucket('stg-db').object('key')obj.upload_file(filename)这似乎工作正常，除了该文件不是公开可用的，而且我无法获得它的公共(public)URL。但是当我登录到S3时，我可以正常查看我的文件。为了使其公开可用，我将最后一行更改为obj.upload_file(file
当我尝试安装Ruby时遇到此错误。我试过查看this和this但无济于事➜~brewinstallrubyWarning:YouareusingOSX10.12.Wedonotprovidesupportforthispre-releaseversion.Youmayencounterbuildfailuresorotherbreakages.Pleasecreatepull-requestsinsteadoffilingissues.==>Installingdependenciesforruby:readline,libyaml,makedepend==>Installingrub
我正在尝试使用boilerpipe来自JRuby。我看过guide从JRuby调用Java，并成功地将它与另一个Java包一起使用，但无法弄清楚为什么同样的东西不能用于boilerpipe。我正在尝试基本上从JRuby中执行与此Java等效的操作:URLurl=newURL("http://www.example.com/some-location/index.html");Stringtext=ArticleExtractor.INSTANCE.getText(url);在JRuby中试过这个:require'java'url=java.net.URL.new("http://www
我在新的Debian6VirtualBoxVM上安装RVM时遇到问题。我已经安装了所有需要的包并使用下载了安装脚本(curl-shttps://rvm.beginrescueend.com/install/rvm)>rvm，但以单个用户身份运行时bashrvm我收到以下错误消息:ERROR:Unabletocheckoutbranch.安装在这里停止，并且(据我所知)没有安装RVM的任何文件。如果我以root身份运行脚本(对于多用户安装)，我会收到另一条消息:Successfullycheckedoutbranch''安装程序继续并指示成功，但未添加.rvm目录，甚至在修改我的.bas