首先搭建建构
引入jar包
创建实体类 Emp.java
public class Emp {
private Integer empId;//员工ID
private String empname; //员工姓名
public Integer getEmpId() {
return empId;
}
public void setEmpId(Integer empId) {
this.empId = empId;
}
public String getEmpname() {
return empname;
}
public void setEmpname(String empname) {
this.empname = empname;
}
}配置大配置
<hibernate-configuration>
<session-factory>
<!-- 1.连接数据库的语句 -->
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="connection.username">scott</property>
<property name="connection.password">0123</property> <!-- 输出所有 SQL 语句到控制台。 -->
<property name="hibernate.show_sql">true</property> <!-- 在 log 和 console 中打印出更漂亮的 SQL。 -->
<property name="hibernate.format_sql">true</property>
<!-- 方言 -->
<property name="hibernate.dialect"> org.hibernate.dialect.Oracle10gDialect</property> <!-- hbm2ddl -->
<property name="hibernate.hbm2ddl.auto">update</property> <!-- 支持getCurrentSession的 属性配置 -->
<property name="hibernate.current_session_context_class">thread</property>
<!-- 关联小配置 --> <!-- <mapping resource="cn/happy/entity/Project.hbm.xml"/> -->
<mapping resource="entity/Emp.hbm.xml"/> </session-factory> </hibernate-configuration>
配置 小配置
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="entity">
<class name="Emp" table="Emp2">
<id name="empId" column="EMPID">
<generator class="native"></generator>
</id>
<property name="empname" type="string" column="empname"></property> <!-- 多对多 -->
<!-- <set name="pros" table="ProEmp">
<key column="nid"></key>
<many-to-many class="Project" column="pid"></many-to-many>
</set>-->
</class> </hibernate-mapping>
创建HibernateUtil工具类
public class HibernateUtil {
private static final ThreadLocal sessionTL = new ThreadLocal();
private static Configuration configuration;
//
private static final SessionFactory sessionFactory;
static{
try {
configuration=new Configuration().configure();
sessionFactory=configuration.buildSessionFactory();
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static Session getSession() {
Session session = (Session)sessionTL.get();
if(session==null)
{
session = sessionFactory.openSession();
sessionTL.set(session);
}
return session;
}
public static void closeSession()
{
Session session = (Session)sessionTL.get();
sessionTL.set(null);
session.close();
}
}搭建Dao
package dao;
import java.io.Serializable;
import util.HibernateUtil;
public class Mydao {
public Object get(Class clazz,Serializable id){
System.out.println("dao\t"+HibernateUtil.getSession());
Object result= HibernateUtil.getSession().load(clazz, id);
return result;
}
}biz层
public class Hibernatebiz {
Mydao dao=new Mydao();
public Object get(Class clazz,Serializable id){
// Transaction tx = HibernateUtil.getSession().beginTransaction();
Object obj= dao.get(clazz, id);
System.out.println("==============================================");
// tx.commit();
// HibernateUtil.closeSession();
return obj;
}
}filter类
public class MyFilter implements Filter{
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
Session session;
Transaction tx=null;
try {
session=HibernateUtil.getSession();
tx=session.beginTransaction();
chain.doFilter(request, response);
tx.commit();
} catch (Exception e) {
e.printStackTrace();
tx.rollback();
}
finally{
HibernateUtil.closeSession();
}
}最后编写测试类
public class H_01Test {
@Test
public void addTest(){
Hibernatebiz biz=new Hibernatebiz();
Object object = biz.get(Emp.class,1);
Emp emp=(Emp)object;
System.out.println(emp.getEmpname());
}
}结果：