hibernate学习笔记（一）

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- 数据库URL -->
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
        <!-- 数据库用户名 -->
        <property name="connection.username">zhengcheng</property>
        <!-- 数据库密码 -->
        <property name="connection.password">123123</property>
        <!-- JDBC驱动 -->
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        
        <!-- 每个数据库都有对应的Dialect以匹配其平台特性 -->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
        <!-- 指定当前session范围和上下文 -->
        <property name="current_session_context_class">thread</property>
        <!-- 指定运行期生成的SQL输出到日志以供调试 -->
        <property name="show_sql">true</property>
        <!-- 是否格式化sql -->
        <property name="format_sql">true</property>
        
        <!-- 映射文件 -->
        <mapping resource="Student.hbm.xml" />    
    </session-factory>
</hibernate-configuration>

package hibDemo1.dao;

import hibDemo1.entity.Student;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class StudentService {
    private static Configuration conf;
    private static SessionFactory sf;
    private static Transaction tx;

    static {
        try {
            conf = new Configuration().configure();
            sf = conf.buildSessionFactory();

        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

    public static Session getSession() {
        return sf.openSession();         //过去老的方法，不需要使用事务
        //return sf.getCurrentSession(); // 新的方法，需要和事务一起使用，可以保证每个用户创建的session独立，需要在配置文件中配置
                                        //<property name="current_session_context_class">thread</property>
    }

    /**
     * 获取所有学生列表
     * 
     * @return
     */
    public List<Student> GetAllStudent() {
        List<Student> list = null;
        Session session = getSession();
        if (session != null) {
            try {
                String hql = "from Student";
                Query query = session.createQuery(hql);
                list = query.list();
            } catch (HibernateException e) {
                e.printStackTrace();
            } finally {
                session.close();
            }
        }
        return list;
    }

    /**
     * 获取单个学生信息
     * 
     * @param stuNo
     * @return
     */
    public Student GetStudentBystuNo(String stuNo) {
        Student stu = null;
        Session session = getSession();
        if (session != null) {
            try {
                // get如果没有查询到数据，则返回null
                // stu = (Student) session.get(Student.class, stuNo);

                // load如果没有查询到数据，则抛出异常
                stu = (Student) session.load(Student.class, stuNo);
            } catch (HibernateException e) {
                e.printStackTrace();
            } finally {
                session.close();
            }
        }
        return stu;
    }

    /**
     * 添加一个学生
     * 
     * @param stu
     * @author Administrator
     */
    public boolean AddStudent(Student stu) {
        boolean b = false;
        Session session = getSession();
        if (session != null) {

            try {
                // 开启一个事务
                tx = session.beginTransaction();
                // 保存
                session.save(stu);
                // 提交事务
                tx.commit();

                return true;

            } catch (HibernateException e) {
                e.printStackTrace();
                tx.rollback();
            } finally {
                session.close();
            }
        }
        return b;
    }

    /**
     * 更新一个学生
     * 
     * @param stu
     * @author Administrator
     */
    public boolean UpdateStudent(String stuNo, String newName) {
        boolean b = false;
        Session session = getSession();
        if (session != null) {

            try {
                // 开启一个事务
                tx = session.beginTransaction();

                // 获取一个学生对象
                Student stu = (Student) session.load(Student.class, stuNo);

                // 更新某个属性
                stu.setStuName(newName);

                // 提交事务
                tx.commit();

                return true;

            } catch (HibernateException e) {
                e.printStackTrace();
                tx.rollback();
            } finally {
                session.close();
            }
        }
        return b;
    }

    /**
     * 更新一个学生
     * 
     * @param stu
     * @author Administrator
     */
    public boolean DeleteStudent(String stuNo) {
        boolean b = false;
        Session session = getSession();
        if (session != null) {

            try {
                // 开启一个事务
                tx = session.beginTransaction();

                // 获取一个学生对象
                Student stu = (Student) session.load(Student.class, stuNo);

                // 删除操作
                session.delete(stu);

                // 提交事务
                tx.commit();

                return true;

            } catch (HibernateException e) {
                e.printStackTrace();
                tx.rollback();
            } finally {
                session.close();
            }
        }
        return b;
    }
}

package hibDemo.test;

import hibDemo1.dao.StudentService;
import hibDemo1.entity.Student;

import java.util.List;
import java.util.Scanner;

public class test {

    public static void main(String[] args) {

        // 添加学生信息
        // AddStudent();

        // 显示所有学生信息
        ShowAll();

        // 显示单个学生信息
        // ShowOne();

        //更新学生信息
        //Update();
        
        //删除学生信息
        //Delete();
        
        ShowAll();
    }

    public static void ShowAll() {
        StudentService service = new StudentService();
        List<Student> list = service.GetAllStudent();
        for (Student student : list) {
            System.out.println(student.getStuNo() + "  " + student.getStuName());
        }
    }

    public static void ShowOne() {
        String no = "A004";
        StudentService service = new StudentService();
        Student student = service.GetStudentBystuNo(no);
        if (student != null) {
            System.out.println(student.getStuNo() + "  " + student.getStuName());
        } else {
            System.out.println("no data");
        }
    }

    public static void AddStudent() {
        Scanner input = new Scanner(System.in);
        Student stu = new Student();
        System.out.print("请输入学生编号：(A001)");
        stu.setStuNo(input.next());
        System.out.print("请输入学生姓名：(A001)");
        stu.setStuName(input.next());
        stu.setStuPass("888888");
        System.out.print("请输入学生年龄：(0-100)");
        stu.setStuAge(input.nextInt());
        System.out.print("请输入学生手机号：(A001)");
        stu.setMobile(input.next());
        System.out.print("请输入学生邮箱：(A001)");
        stu.setEmail(input.next());
        System.out.print("请输入学生地址：(A001)");
        stu.setAddress(input.next());

        StudentService service = new StudentService();
        service.AddStudent(stu);
    }

    public static void Update() {
        Scanner input = new Scanner(System.in);
        System.out.print("输入要修改的学号：");
        String stuNo = input.next();
        System.out.print("输入要修改的姓名：");
        String newName = input.next();

        StudentService service = new StudentService();
        service.UpdateStudent(stuNo, newName);
    }

    public static void Delete() {
        Scanner input = new Scanner(System.in);
        System.out.print("输入要修改的学号：");
        String stuNo = input.next();

        StudentService service = new StudentService();
        service.DeleteStudent(stuNo);
    }
}