當插入「克拉科夫」和「克拉科夫」時，「重複鍵入主鍵」

我有一個實體位置座標用於保存具有唯一位置和國家的數據庫位置座標（製作組合主鍵）其被定義爲如下：當插入「克拉科夫」和「克拉科夫」時，「重複鍵入主鍵」

@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; 
    } 
}

而批插入在位置JPA以UTF-8字符座標設定爲例如

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; 
    } 
} 
}

在調用保存功能，我得到以下異常

2013-10-09 19:42:41,892 [ERROR ][pool-1-thread-1] JDBCExceptionReporter - Duplicate entry 'Poland-KrakÃ³w' 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-KrakÃ³w' 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-KrakÃ³w' 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

由於「克拉科夫」和「克拉科夫」是不同的字符串值，所以這些都不會被視爲重複，但因爲我們在例外情況下可以看到這些被視爲相同的價值。請幫忙。

來源

2013-10-10 Rohit Srivastava

是鍵列的 'NVARCHAR'？ – StuartLC

不，鍵列的數據類型是VARCHAR（255） –

嘗試使用~~utf8_general_ci~~utf8_bin作爲MySQL中列的歸類。

這似乎不是一個Java問題，而是一個MySQL問題。

瞭解更多有關排序規則here

這是正確的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;

來源

2013-10-10 06:30:14 Stefan

我嘗試將utf8_general_ci作爲表格上的排序規則，但它也會給出相同的錯誤。 –

@RohitSrivastava：你是否使用它作爲特定字段的排序規則？請給我們「CREATE TABLE」。 – Stefan

是的，我用utf8_general_ci排序的位置和國家。 –

當插入「克拉科夫」和「克拉科夫」時，「重複鍵入主鍵」

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