我使用Spring Boot和WebSocket项目，当我试图保持（保存）输出消息时出现错误。我打印了要提供的实体，
Inout MessageMessage{id=null, from='Mark', text='I travel to Brazil'}
Output MessageOutputMessage{id=null, from='Mark', message='I travel to Brazil', topic='Travel', time=Tue Nov 14 10:53:06 BDT 2017}
Hibernate: insert into output_message (from, message, time, topic) values (?, ?, ?, ?)
下面提供了错误消息，
org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement
Caused by: org.hibernate.exception.SQLGrammarException: could not execute statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:207) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:42) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2803) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3374) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:619) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:273) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:254) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:299) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:317) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:272) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:178) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:109) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:67) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:189) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:132) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:775) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:748) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:753) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1146) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from, message, time, topic) values ('Mark', 'I travel to Brazil', '2017-11-14 10' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_144]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_144]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_144]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_144]
控制器就在这里，
@Controller
public class ChatController {
@Autowired
private OutputMessageService outputMessageService;
@Autowired
private MessageService messageService;
@MessageMapping("/chat/{topic}")
@SendTo("/topic/messages")
public OutputMessage send(@DestinationVariable("topic") String topic,
Message message) throws Exception {
OutputMessage outputMessage = new OutputMessage(message.getFrom(), message.getText(), topic);
System.out.println("Inout Message" + message.toString());
System.out.println("Output Message" + outputMessage.toString());
outputMessageService.save(outputMessage);
messageService.save(message);
return outputMessage;
}
}
提供OutputMessage实体，
@Entity
public class OutputMessage {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String from;
private String message;
private String topic;
private Date time = new Date();
public OutputMessage() {
}
public OutputMessage(String from, String message, String topic) {
this.from = from;
this.message = message;
this.topic = topic;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getTopic() {
return topic;
}
public void setTopic(String topic) {
this.topic = topic;
}
public Date getTime() {
return time;
}
@Override
public String toString() {
return "OutputMessage{" +
"id=" + id +
", from='" + from + '\'' +
", message='" + message + '\'' +
", topic='" + topic + '\'' +
", time=" + time +
'}';
}
}
存储库，
public interface OutputMessageRepository extends CrudRepository<OutputMessage, Long> {
}
服务实施，
@Service
public class OutputMessageServiceImpl implements OutputMessageService {
@Autowired
private OutputMessageRepository omRepository;
@Override
public List<OutputMessage> findAll() {
return (List<OutputMessage>) omRepository.findAll();
}
@Override
public void save(OutputMessage outputMessage) {
omRepository.save(outputMessage);
}
}
这是什么问题？
答案 0 :(得分：5)
由于您的字段名from而可能发生，请添加hibernate.globally_quoted_identifiers=true媒体资源，然后重试。这将引用所有数据库标识符。