不知道出什么问题了。我得到的例外：
org.hibernate.MappingException：未知实体：org.hibernate.employee
如何解决？我创建了client.java。我创建了与客户端匹配的映射表。我已经创建了映射并添加了映射
hibernateutil.java编码
package org.hibernate.test.util;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class hibernateutil {
private static SessionFactory sessionfactory;
public static SessionFactory getSessionFactory(){
if(sessionfactory == null){
synchronized(hibernateutil.class){
if(sessionfactory == null){
try {
Configuration conf=new Configuration().configure();
StandardServiceRegistryBuilder builder= new StandardServiceRegistryBuilder()
.applySettings(conf.getProperties());
sessionfactory = conf.buildSessionFactory(builder.build());
}catch (Throwable th){
th.printStackTrace();
throw new ExceptionInInitializerError();
}
}
return sessionfactory;
}
}
else{
return sessionfactory;
}
}
}
employee.java
package org.hibernate;
public class employee {
private int id;
private String firstname;
private String lastname;
private int salary;
public employee(){}
public employee(int id,String firstname,String lastname,int salary)
{
this.id=id;
this.firstname=firstname;
this.lastname=lastname;
this.salary=salary;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.username">javaguy</property>
<property name="connection.password"></property>
<property name="hibernate.jdbc.batch_size">100</property>
<property name="connection.pool_size">1</property>
<property name="show_sql">false</property>
<property name="format_sql">true</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping resource="org/hibernate/employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
employee.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Oct 20, 2016 7:56:20 PM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="employee" table="EMPLOYEE">
<id name="id" type="int">
<column name="EMP_ID" />
<generator class="assigned" />
</id>
<property name="firstname" type="java.lang.String">
<column name="FIRST_NAME" />
</property>
<property name="lastname" type="java.lang.String">
<column name="LAST_NAME" />
</property>
<property name="salary" type="int">
<column name="SALARY" />
</property>
</class>
</hibernate-mapping>
客户端程序
package learn;
import org.hibernate.Session;
import java.util.List;
import java.util.Date;
import java.util.Iterator;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.test.util.hibernateutil;
import org.hibernate.*;
public class client {
private static SessionFactory factory;
public static void main(String[] args) {
factory = hibernateutil.getSessionFactory();
client a = new client();
// Add few employee records in data base
a.addemployee(1,"Sai","Nathan",5000);
a.addemployee(2,"Sai","kumar",6000);
a.addemployee(3,"Santhosh","Kumar",9000);
// List down all employees
/*a.listemployee();
// update employee's record
a.updateemployee(1,20000);
// Delete an employee
a.deleteemployee(3);
// List down all employees
a.listemployee();*/
System.out.println("Finished");
}
/* Method to CREATE an employee in the database */
public Integer addemployee(int id, String fname,String lname,int salary)
{
Session session= factory.openSession();
Transaction tx=session.beginTransaction();
employee e1= new employee(id,fname,lname,salary);
Integer empid=(Integer)session.save(e1);
tx.commit();
session.close();
return empid;
}
/* Method to READ all the employees */
public void listemployee(){
Session session = factory.openSession();
List<employee> emplist = session.createQuery("FROM Employee").list();
for(employee emp:emplist){
System.out.print("First name" +emp.getFirstname());
System.out.print("Last name" +emp.getLastname());
System.out.println("Salary" +emp.getSalary());
}
session.close();
}
/* Method to UPDATE salary for an employee */
public void updateemployee(Integer id,Integer salary)
{
Session session = factory.openSession();
Transaction tx = session.beginTransaction();
employee emp = (employee)session.get(employee.class, id);
emp.setSalary(salary);
session.update(emp);
tx.commit();
session.close();
}
public void deleteemployee(Integer id)
{
Session session = factory.openSession();
Transaction tx = session.beginTransaction();
employee emp = (employee)session.get(employee.class, id);
session.delete(emp);
tx.commit();
}
}
错误：
项目路径：
最佳答案
<class name="employee">
应具有完整的软件包名称（路径），并且所有类均应以大写字母开头。
所以应该像这样：
package mypackage;
public class Employee
{
...
}
<class name="mypackage.Employee" ...>