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实体类如下： package com.mys.model;
// default package
import java.util.Date;
/**
* User entity. @author MyEclipse Persistence Tools
*/
public class User implements java.io.Serializable {
// Fields
private String id;
private String userName;
private String userPwd;
private String sex;
private Integer age;
private String jiguan;
private Date userRegisterTime;
// Constructors
/** default constructor */
public User() {
}
/** minimal constructor */
public User(String id, String userName, String userPwd, Date userRegisterTime) {
this.id = id;
this.userName = userName;
this.userPwd = userPwd;
this.userRegisterTime = userRegisterTime;
}
/** full constructor */
public User(String id, String userName, String userPwd, String sex, Integer age, String jiguan, Date userRegisterTime) {
this.id = id;
this.userName = userName;
this.userPwd = userPwd;
this.sex = sex;
this.age = age;
this.jiguan = jiguan;
this.userRegisterTime = userRegisterTime;
}
// Property accessors
public String getId() {
return this.id;
}
public void setId(String id) {
this.id = id;
}
public String getUserName() {
return this.userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return this.userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public String getSex() {
return this.sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Integer getAge() {
return this.age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getJiguan() {
return this.jiguan;
}
public void setJiguan(String jiguan) {
this.jiguan = jiguan;
}
public Date getUserRegisterTime() {
return this.userRegisterTime;
}
public void setUserRegisterTime(Date userRegisterTime) {
this.userRegisterTime = userRegisterTime;
}
}
业务类如下： package com.mys.util;
/**
* 我们必须启动Hibernate，此过程包括创建一个全局的SessoinFactory，并把它储存在应用程序代码容易访问的地方。
*/
import java.util.List;
import com.mys.model.*;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class HibernateUtil{
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from hibernate.cfg.xml
//以前hibernate文档里的： sessionFactory = new Configuration().configure().buildSessionFactory();
Configuration config=new Configuration();
config.configure();
config.addClass(User.class);//完整类名?
sessionFactory=config.buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
// 查询用户信息
public void showUsers()
{
Session session = sessionFactory.openSession();
Transaction tx=null;
try{
tx=session.beginTransaction();
Query query=session.createQuery("from tb_User as u");
List list=query.list();//List是util.*类库里的接口
System.out.println("id"+"用户名"+"用户密码"+"性别"+"年龄"+"籍贯"+"注册时间");
for(int i=0;i<list.size();i++)
{
User u=(User)list.get(i);
System.out.print(u.getId());
// 省略部分
System.out.print(u.getUserName());
System.out.print(u.getUserPwd());
System.out.print(u.getSex());
System.out.print(u.getAge());
System.out.print(u.getJiguan());
System.out.print(u.getUserRegisterTime());
System.out.println("");
}
tx.commit();
}
catch(Exception e){
e.printStackTrace();
}finally{
session.close();
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
HibernateUtil h=new HibernateUtil();
h.showUsers();
}
}
配置文件hibernate.cfg.xml如下： <?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"> <!-- Generated by MyEclipse Hibernate Tools. --> <hibernate-configuration> <session-factory> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <property name="connection.url"> jdbc:mysql://localhost:3306/db_test </property> <property name="connection.username">root</property> <property name="connection.password">425175</property> <property name="connection.driver_class"> com.mysql.jdbc.Driver </property> <property name="myeclipse.connection.profile"> com.mysql.jdbc.Driver </property> <mapping resource="./User.hbm.xml" /> </session-factory> </hibernate-configuration> 映射文件在src目录下User.hbm.xml： <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd "> <!-- Mapping file autogenerated by MyEclipse Persistence Tools --> <hibernate-mapping> <class name="User" table="db_user" catalog="db_test"> <id name="id" type="java.lang.String"> <column name="id" length="15" /> <generator class="assigned"></generator> </id> <property name="userName" type="java.lang.String"> <column name="userName" length="20" not-null="true" /> </property> <property name="userPwd" type="java.lang.String"> <column name="userPwd" length="20" not-null="true" /> </property> <property name="sex" type="java.lang.String"> <column name="sex" length="4" /> </property> <property name="age" type="java.lang.Integer"> <column name="age" /> </property> <property name="jiguan" type="java.lang.String"> <column name="jiguan" length="20" /> </property> <property name="userRegisterTime" type="java.util.Date"> <column name="userRegisterTime" length="10" not-null="true" /> </property> </class> </hibernate-mapping> 我想用Hibernate实现一个查询数据库里所有数据的功能，映射文件和实体类都是自动生成的，业务类是自己参照着数编写的。 |
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| 25分 |
异常信息中没有：could not find the main class
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Hibernate框架中的，could not find the main class 的问题
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