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一.导包
二.写总配置文件 hibernate.cfg.xml
<!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> <!--数据库连接配置--> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql:///learnstruts</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">33269456.cx</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property> <property name="hibernate.show_sql">true</property> <!--加载所有映射--> <mapping resource="com/cx/hello/Employee.hbm.xml"></mapping> </session-factory> </hibernate-configuration>
三.写entity类
package com.cx.hello; import java.util.Date; /** * Created by cxspace on 16-7-16. */ public class Employee { private int empId; private String empName; private Date workDate; public int getEmpId() { return empId; } public void setEmpId(int empId) { this.empId = empId; } public String getEmpName() { return empName; } public void setEmpName(String empName) { this.empName = empName; } public Date getWorkDate() { return workDate; } public void setWorkDate(Date workDate) { this.workDate = workDate; } @Override public String toString() { return "Employee{" + "empId=" + empId + ", empName=‘" + empName + ‘\‘‘ + ", workDate=" + workDate + ‘}‘; } }
四,编写对象关系配置文件 Employee.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.cx.hello">
<class name="Employee" table="employee">
<!--对象与表,字段与属性-->
<!--主键,映射-->
<id name="empId" column="id">
<generator class="native"/>
</id>
<!--非主键,映射-->
<property name="empName" column="empName" ></property>
<property name="workDate" column="workDate"></property>
</class>
</hibernate-mapping>
五.编写接口com.cx.crud.IEmployeeDao
package com.cx.crud; import com.cx.hello.Employee; import java.io.Serializable; import java.util.List; /** * Created by cxspace on 16-7-19. */ public interface IEmployeeDao { void save(Employee emp); void update(Employee emp); Employee findById(Serializable id); List<Employee> getAll(); List<Employee> getAll(String employeeName); List<Employee> getAll(int index , int count); void delete(Serializable id); }
六.编写实现
package com.cx.crud; import com.cx.hello.Employee; import com.cx.utils.HibernateUtils; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.Transaction; import java.io.Serializable; import java.util.List; /** * Created by cxspace on 16-7-19. */ public class EmployeeDao implements IEmployeeDao { @Override public void save(Employee emp) { Session session = null; Transaction tx = null; try { //获取session session = HibernateUtils.getSession(); //开启事务 tx = session.beginTransaction(); //执行保存操作 session.save(emp); } catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public void update(Employee emp) { Session session = null; Transaction tx = null; try { //获取session session = HibernateUtils.getSession(); //开启事务 tx = session.beginTransaction(); session.update(emp); } catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public Employee findById(Serializable id) { Session session = null; Transaction tx = null; try { //获取session session = HibernateUtils.getSession(); //开启事务 tx = session.beginTransaction(); //主键查询 return (Employee) session.get(Employee.class, id); } catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public List<Employee> getAll() { Session session = null; Transaction tx = null; try { session = HibernateUtils.getSession(); tx = session.beginTransaction(); //HQL查询 Query q = session.createQuery("from Employee"); return q.list(); }catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public List<Employee> getAll(String employeeName) { Session session = null; Transaction tx = null; try { session = HibernateUtils.getSession(); tx = session.beginTransaction(); Query q = session.createQuery("from Employee where empName = ?"); //下标必须从0开始 q.setParameter(0,employeeName); //执行这行开始查询 return q.list(); }catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public List<Employee> getAll(int index, int count) { Session session = null; Transaction tx = null; try { session = HibernateUtils.getSession(); tx = session.beginTransaction(); Query q = session.createQuery("from Employee "); //设置查询起始行 q.setFirstResult(index); //查询返回的行数 q.setMaxResults(count); List<Employee> list = q.list(); return list; }catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } @Override public void delete(Serializable id) { Session session = null; Transaction tx = null; try { session = HibernateUtils.getSession(); tx = session.beginTransaction(); //删除，先根据id查到对象，再删除对象 Object obj = session.get(Employee.class,id); if (obj != null){ session.delete(obj); } }catch (Exception e){ throw new RuntimeException(e); }finally { tx.commit(); session.close(); } } }
session获取工具类
package com.cx.utils; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; /** * Created by cxspace on 16-7-19. */ public class HibernateUtils { private static SessionFactory sf; static { //加载主配置文件，并创建session对象 sf = new Configuration().configure().buildSessionFactory(); } public static Session getSession(){ return sf.openSession(); } }
七.编写测试
package com.cx.test; import com.cx.crud.EmployeeDao; import com.cx.hello.Employee; /** * Created by cxspace on 16-7-23. */ public class Test { private EmployeeDao employeeDao = new EmployeeDao(); @org.junit.Test public void testsave(){ Employee employee = new Employee(); employee.setEmpName("奥巴马"); employeeDao.save(employee); } public void testupdate(){ Employee employee =new Employee(); //更新必须设置主键 employee.setEmpId(24); employee.setEmpName("new奥巴吗"); employeeDao.update(employee); } public void testfindById(){ System.out.println(employeeDao.findById(1)); } public void testgetAll(){ System.out.println(employeeDao.getAll()); } public void testgetByname(){ System.out.println(employeeDao.getAll("张三")); } public void testgetAllfenye(){ System.out.println(employeeDao.getAll(0,2)); } public void delete(){ employeeDao.delete(27); } }
附：数据库脚本
CREATE TABLE `employee` ( `id` int(11) NOT NULL AUTO_INCREMENT, `empName` varchar(20) DEFAULT NULL, `workDate` date DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=28 DEFAULT CHARSET=utf8
测试数据
1 张三 2016-07-18 2 jhon 2008-03-19 3 tim 2008-03-19 4 ooo 2013-04-10 5 cx 2008-03-19 6 eee22 2013-04-09 7 dedede 2009-04-30 8 abc 2009-04-30 9 eqwe 2009-04-30 10 qwqwqw 2009-04-30 11 ssdada 2009-04-30 12 wqeqe 2009-04-23 13 weqeqwewqe 2009-04-23 14 abc 2009-04-30 15 weqrq 2009-04-30 16 cxspace 2009-04-23 17 2132131 2009-04-30 18 wtewtrt 2009-04-30 19 eqrqrq 2009-04-30 20 rwqrerq 2009-04-23 21 aaasadad 1330-02-19 22 小明 2016-07-16 23 小华 2016-07-16 28 奥巴马
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原文地址：http://www.cnblogs.com/cxspace/p/5698144.html
