Java笔记之hibernate(二):增删改查

0.说在前面

1.新增

1.1 新建SaveTest类

package com.hibernate.demo.test;

import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

import com.hibernate.demo.bean.Employee;

public class SaveTest {

    public static void main(String[] args) {
        //加载配置文件,创建会话工厂类
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        //创建会话对象
        Session session = sessionFactory.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();
        //新建Employee对象
        Employee employee=new Employee();
        employee.setEmpName("emp111");
        //保存对象
        session.save(employee);
        //提交事务
        transaction.commit();
        //关闭会话对象
        session.close();
        //关闭会话工厂对象
        sessionFactory.close();
    }

}

1.2 运行SaveTest类

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Hibernate: insert into t_employee (emp_name) values (?)

1.3 查看数据库

2.查询

2.1 新建GetTest类

package com.hibernate.demo.test;

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

import com.hibernate.demo.bean.Employee;

public class GetTest {

    public static void main(String[] args) {
        //加载配置文件,创建会话工厂对象
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        //创建会话对象
        Session session = sessionFactory.openSession();
        //根据id获取Employee对象
        Employee employee = (Employee) session.get(Employee.class, 1);
        System.out.println(employee);
        //关闭会话对象
        session.close();
        //关闭会话工厂对象
        sessionFactory.close();
    }

}

2.2 运行GetTest类

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Hibernate: select employee0_.emp_id as emp1_0_0_, employee0_.emp_name as emp2_0_0_ from t_employee employee0_ where employee0_.emp_id=?
Employee [empId=1, empName=张三]

3.修改

3.1新建UpdateTest类

package com.hibernate.demo.test;

import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

import com.hibernate.demo.bean.Employee;

public class UpdateTest {

    public static void main(String[] args) {
        //加载配置文件,创建会话工厂对象
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        //创建会话对象
        Session session = sessionFactory.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();
        //根据id获取Employee对象
        Employee employee = (Employee) session.get(Employee.class, 1);
        System.out.println(employee);
        //修改信息
        employee.setEmpName("张三plus");
        //更新数据库信息
        session.update(employee);
        //提交事务
        transaction.commit();
        //再根据id去获取Employee对象
        Employee employee2 = (Employee) session.get(Employee.class, 1);
        System.out.println(employee2);
        //关闭会话对象
        session.close();
        //关闭会话工厂对象
        sessionFactory.close();
    }

}

3.2 运行UpdateTest类

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Hibernate: select employee0_.emp_id as emp1_0_0_, employee0_.emp_name as emp2_0_0_ from t_employee employee0_ where employee0_.emp_id=?
Employee [empId=1, empName=张三]
Hibernate: update t_employee set emp_name=? where emp_id=?
Employee [empId=1, empName=张三plus]

4.删除

4.1创建DeleteTest类

package com.hibernate.demo.test;

import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

import com.hibernate.demo.bean.Employee;

public class DeleteTest {

    public static void main(String[] args) {
        //加载配置文件,创建会话工厂对象
        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        //创建会话对象
        Session session = sessionFactory.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();
        //根据id获取Employee对象
        Employee employee = (Employee) session.get(Employee.class, 1);
        System.out.println(employee);
        //删除
        session.delete(employee);
        //提交事务
        transaction.commit();
        //根据id再去获取Employee对象
        Employee employee2 = (Employee) session.get(Employee.class, 1);
        System.out.println(employee2);
        //关闭会话对象
        session.close();
        //关闭会话工厂对象
        sessionFactory.close();
    }

}

4.2运行DeleteTest类

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Hibernate: select employee0_.emp_id as emp1_0_0_, employee0_.emp_name as emp2_0_0_ from t_employee employee0_ where employee0_.emp_id=?
Employee [empId=1, empName=张三plus]
Hibernate: delete from t_employee where emp_id=?
Hibernate: select employee0_.emp_id as emp1_0_0_, employee0_.emp_name as emp2_0_0_ from t_employee employee0_ where employee0_.emp_id=?
null