hibernate——第一次简单的使用

 1 package com.xiaostudy.demo; 2 ?3 public class User { 4 ?5 ????private int id; 6 ????private String username; 7 ????private String password; 8 ?9 ????public int getId() {10 ????????return id;11 ????}12 13 ????public void setId(int id) {14 ????????this.id = id;15 ????}16 17 ????public String getUsername() {18 ????????return username;19 ????}20 21 ????public void setUsername(String username) {22 ????????this.username = username;23 ????}24 25 ????public String getPassword() {26 ????????return password;27 ????}28 29 ????public void setPassword(String password) {30 ????????this.password = password;31 ????}32 33 }

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-mapping PUBLIC ?3 ????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 ????"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 ?????6 ????<!-- 导入bean所在的包路径 --> 7 <hibernate-mapping package="com.xiaostudy.demo"> 8 ????<!-- 把bean中的类名和mysql中的表名对应 --> 9 ????<class name="User" table="user">10 ????????<!-- bean中id和mysql中主键对应 -->11 ????????<id name="id" column="id">12 ????????????<!-- generator:主键生成策略13 ?????????????????????1.increment ?数据库自己生成主键. 先从数据库中查询最大的ID值,将ID值加1作为新的主键14 ????????????????????2.identity ?依赖于数据的主键自增功能15 ????????????????????3.sequence ???序列,依赖于数据中的序列功能(Oracle).16 ????????????????????4.hilo(纯了解,永远用不到) : Hibernate自己实现序列的算法,自己生成主键. (hilo算法 )17 ????????????????????5.native 自动根据数据库判断,三选一. identity|sequence|hilo18 ????????????????????6.uuid ?生成32位的不重复随机字符串当做主键19 ????????????????????7.assigned 自己指定主键值. 表的主键是自然主键时使用.20 ?????????????????21 ?????????????-->22 ????????????<generator class="native"></generator>23 ????????</id>24 ????????<!-- bean中的属性和mysql中的字段对应 -->25 ????????<property name="username" column="username"></property>26 ????????<property name="password" column="password"></property>27 ????</class>28 </hibernate-mapping>

 1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE hibernate-mapping PUBLIC ?3 ????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 ????"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 ?????6 ????<!-- 导入bean所在的包路径 --> 7 <hibernate-mapping package="com.xiaostudy.demo"> 8 ????<!-- 把bean中的类名和mysql中的表名对应 --> 9 ????<class name="User" table="user">10 ????????<!-- bean中id和mysql中主键对应 -->11 ????????<id name="id" column="id">12 ????????????<!-- generator:主键生成策略13 ?????????????????????1.increment ?数据库自己生成主键. 先从数据库中查询最大的ID值,将ID值加1作为新的主键14 ????????????????????2.identity ?依赖于数据的主键自增功能15 ????????????????????3.sequence ???序列,依赖于数据中的序列功能(Oracle).16 ????????????????????4.hilo(纯了解,永远用不到) : Hibernate自己实现序列的算法,自己生成主键. (hilo算法 )17 ????????????????????5.native 自动根据数据库判断,三选一. identity|sequence|hilo18 ????????????????????6.uuid ?生成32位的不重复随机字符串当做主键19 ????????????????????7.assigned 自己指定主键值. 表的主键是自然主键时使用.20 ?????????????????21 ?????????????-->22 ????????????<generator class="native"></generator>23 ????????</id>24 ????????<!-- bean中的属性和mysql中的字段对应 -->25 ????????<property name="username" column="username"></property>26 ????????<property name="password" column="password"></property>27 ????</class>28 </hibernate-mapping>

 1 package com.xiaostudy.demo; 2 ?3 import org.hibernate.SessionFactory; 4 import org.hibernate.cfg.Configuration; 5 import org.hibernate.classic.Session; 6 ?7 public class Test1 { 8 ?9 ????public static void main(String[] args) {10 ????????//加载hibernate.cfg.xml文件，前提是默认放在src目录下11 ????????Configuration conf = new Configuration().configure();12 ????????//根据配置，创建Factory13 ????????SessionFactory sf = conf.buildSessionFactory();14 ????????//通过SessionFactory来获取Session,15 ????????//getCurrentSession()方法是，获取当前的Session，一般在事务中使用16 ????????//但是需要在hibernate.cfg.xml中配置才可以使用17 ????????//<property name="current_session_context.class">thread</property>18 ????????Session session = sf.getCurrentSession();19 ????????User user = new User();20 ????????user.setUsername("demo3");21 ????????user.setPassword("123456");22 ????????session.save(user);23 ????????//关闭资源24 ????????session.close();25 ????????sf.close();26 ????}27 28 }