我看过几个关于这个主题的帖子，其中每个人都建议添加 @Id 注释我已经从头开始做了除了IntelliJ ide帮助我生成 Entity 类自动，所以基本上我没有参与编写这些注释。但是，当我尝试从 hibernate 控制台运行查询时：
from InfoEntity where id = 1
它给了我例外：
java.lang.RuntimeException: org.hibernate.AnnotationException: No identifier specified for entity: sample.InfoEntity
at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:277)
at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:224)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:665)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3512)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3466)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1355)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1756)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840)
at com.intellij.hibernate.console4.remote.HibernateFacadeImpl$1.buildSessionFactory(HibernateFacadeImpl.java:23)
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 sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$256(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:217)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:171)
at com.sun.proxy.$Proxy158.buildSessionFactory(Unknown Source)
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 com.intellij.execution.rmi.RemoteUtil.invokeRemote(RemoteUtil.java:124)
at com.intellij.execution.rmi.RemoteUtil.access$100(RemoteUtil.java:36)
at com.intellij.execution.rmi.RemoteUtil$2$1$1.compute(RemoteUtil.java:105)
at com.intellij.execution.rmi.RemoteUtil.executeWithClassLoader(RemoteUtil.java:181)
at com.intellij.execution.rmi.RemoteUtil$2$1.invoke(RemoteUtil.java:102)
at com.sun.proxy.$Proxy158.buildSessionFactory(Unknown Source)
at com.intellij.hibernate.engine.HibernateEngine.ensureInitialized(HibernateEngine.java:121)
at com.intellij.hibernate.engine.HibernateEngine.createQuery(HibernateEngine.java:140)
at com.intellij.jpa.engine.JpaEngineBase.executeQueryInner(JpaEngineBase.java:166)
at com.intellij.jpa.engine.JpaEngineBase.access$000(JpaEngineBase.java:56)
at com.intellij.jpa.engine.JpaEngineBase$1.compute(JpaEngineBase.java:128)
at com.intellij.jpa.engine.JpaEngineBase$1.compute(JpaEngineBase.java:123)
at com.intellij.database.console.AbstractEngine$4.compute(AbstractEngine.java:179)
at com.intellij.database.console.AbstractEngine$4.compute(AbstractEngine.java:174)
at com.intellij.database.console.AbstractEngine$3.run(AbstractEngine.java:159)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
实体类
import javax.persistence.*;
/**
* Created by fayme on 1/5/2016.
*/
@Entity
@Table(name = "Info", schema = "dbo", catalog = "temp")
public class InfoEntity {
@Id
@Column(name = "id")
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "name")
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
InfoEntity that = (InfoEntity) o;
if (id != that.id) return false;
if (name != null ? !name.equals(that.name) : that.name != null) return false;
return true;
}
@Override
public int hashCode() {
int result = id;
result = 31 * result + (name != null ? name.hashCode() : 0);
return result;
}
hibernate.cfg.xml中
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:sqlserver://localhost:1433;databaseName=temp</property>
<property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<mapping class="sample.InfoEntity"/>
<!--<mapping resource="sample/InfoMapping.xml"/>-->
<!-- DB schema will be updated if needed -->
<!-- <property name="hbm2ddl.auto">update</property> -->
</session-factory>
</hibernate-configuration>
在这种情况下，我做错了什么!!!
答案 0 :(得分：0)
hibernate.cfg.xml 在创建Entity类时自动更新，稍后我手动添加了属性connaction.username和connection.password，其用户名为“Sa”及其密码现在它的工作。