hibernate创建构架

创建hibernate架构:

注意:需要将所需的架包导进去:

二:Java工程的具体结构:

具体代码如下: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>
　　 <--   -->
    <!--
        连接数据库的四大参数：①驱动②数据库③账户④密码，注意：不能有空格 
    -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>
    <!-- 控制台打印sql语句 测试 -->
        <property name="show_sql">true</property>
    <!-- 
        引入映射文件，这是domain中绑定的employee.hbm.xml路径
     -->    
        <mapping resource="demo/test/domain/employee.hbm.xml"/>
    
    </session-factory>
    
    
</hibernate-configuration>

模板方法的接口:

package demo.test.dao;

import java.util.List;

import demo.test.domain.Employee;

public interface IEmployee {
    public void save(Employee emp);
    public void delete(Employee employ);
    public void update(Employee emp);
    List<Employee> list();
    public Employee get(Employee emp);
    
}

实现类:

package demo.test.dao.impl;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

import demo.test.dao.IEmployee;
import demo.test.domain.Employee;
import demo.test.utiltool.UtilTool;

public class ImplEmployee implements IEmployee {

    @SuppressWarnings("deprecation")
    @Override
    public void save(Employee emp) {
        Session session = UtilTool.getSession();
        // Configuration configuration = new
        // Configuration().configure();//配置对象Configuration主要靠config加载解析配置文件
        // Session session = configuration.buildSessionFactory().openSession();
        session.beginTransaction();//加了事物,是出于安全性考虑.
        session.save(emp);
        session.getTransaction().commit();//加了事物,是出于安全性考虑.

        session.close();
    }

    @Override
    public void delete(Employee emp) {
        Session session = UtilTool.getSession();
        session.beginTransaction();
        session.delete(emp);
        session.getTransaction().commit();
        session.close();
    }

    @Override
    public void update(Employee emp) {
        Session session = UtilTool.getSession();
        session.beginTransaction();
        session.update(emp);
        session.getTransaction().commit();
        session.close();
    }

    @Override
    public List<Employee> list() {
        Session session = UtilTool.getSession();
        Query query = session.createQuery("SELECT emp FROM Employee emp");
        @SuppressWarnings("unchecked")
        List<Employee> list = query.list();
        return list;
    }

    @Override
    public Employee get(Employee emp) {
        Session session = UtilTool.getSession();
        session.beginTransaction();
        Employee emplo = (Employee) session.get(emp.getClass(), emp.getId());
        session.close();
        return emplo;
    }

}

Javabean规范:

package demo.test.domain;
//javabean规范:①必须是一个公共类②类变量都为private私有③空参构造方法④getter和setter方法
public class Employee {
    private Integer id;
    private String name;
    private Integer age;
    public Employee() {}
    public Employee(String name, Integer age, Integer id) {
        this.name = name;
        this.age = age;
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public Employee(Integer id) {
        this.id = id;
    }
    public Employee(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
    @Override
    public String toString() {
        return "Employee [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
    
}

javabean规范中的类所对应的.xml文件:跟随Employee

最终要将此文件部署到hibernate.cfg.xml的mapping resource中

<?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="demo.test.domain">
    <class name="Employee" table="t_employee"> <!-- 对象模型名 和  表名 -->
        <id name="id" column="e_id">
            <generator class="native" /> <!-- 根据本地设置主键  -->
        </id>
        <property name="name" column="e_name"/>
        <property name="age" column="e_age"/>
    </class>
</hibernate-mapping>

工具类:将冗余部分抽出,作为公共部分供其他方法调用

package demo.test.utiltool;

import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

public class UtilTool {
    
    public static Session getSession(){
        //配置对象Configuration主要靠config加载解析配置文件
        Session session = new Configuration().configure().buildSessionFactory().openSession();
        return session;
    }
}

测试类:

package demo.test.utiltest;

import org.junit.Test;

import demo.test.dao.IEmployee;
import demo.test.dao.impl.ImplEmployee;
import demo.test.domain.Employee;

//测试类
public class TestClass {
    IEmployee employ;
    public TestClass() {
     employ = new ImplEmployee();
    }
    
    @Test
    public void testSave() {
        IEmployee employee = new ImplEmployee();
        Employee employ = new Employee("sdsa", 112);
        employee.save(employ);
    }

    @Test
    public void testdelete() {
        IEmployee employee = new ImplEmployee();
        Employee employ = new Employee(5);
        employee.delete(employ);
    }

    @Test
    public void testupdate() {
        IEmployee employee = new ImplEmployee();
        Employee employ = new Employee("張三",12,6);
        employee.update(employ);
    }
    @Test
    public void testlist() {
        System.out.println(employ.list());
    }
    @Test
    public void testget() {
        IEmployee employee = new ImplEmployee();
        Employee employ = new Employee(6);
        Employee empl = employee.get(employ);
        System.out.println(empl);
        
    }
}