Hibernate修改操作 刪除操作 查詢操作 增加操作 增刪改查 Hibernate增刪查改語句

我用的數據庫是MySQL，實體類叫User

public class User {
    private Integer uid;
    private String username;
    private String password;
    private Integer age;
    private String gender;
    private String phoneNumber;
}

 1.Hibernate添加數據操作

       // 操作流程:
        // 1.通過session啟動事務
        Transaction transaction = session.beginTransaction();
        // 2.執行添加操作
        User user = new User("艾格尼絲","女","18977783654");
        Serializable save = session.save(user);
        System.out.println("save: " + save);
        // 3.提交或回滾事務
        transaction.commit();

 2.Hibernate刪除數據操作

        Transaction transaction = session.beginTransaction();
        // 1.先從數據庫查出來需要刪除的對象
        User user = session.get(User.class,3);
        // 2.再進行刪除
        session.delete(user);
        transaction.commit();

3.Hibernate修改數據操作

        Transaction transaction = session.beginTransaction();
        // 1.從數據庫中獲取需要修改的對象
        User user =session.get(User.class, 3);
        // 2.對該對象中的數據進行修改
        user.setUsername("李小龍");
        // 3.將修改后的對象更新到數據庫中
        session.update(user);
        transaction.commit();

4.Hibernate查詢數據操作

        Transaction transaction = session.beginTransaction();
        //根據用戶編號進行查詢
        User user = session.get(User.class, 3);
        System.out.println(user.getUsername());
        transaction.commit();

5.Hibernate增刪改查全部的代碼文件

package com.bj186.test;

import com.bj186.entity.User;
import com.bj186.util.HibernateUtil;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Before;
import org.junit.Test;
import java.io.Serializable;


public class TestUser {

    private Session session = null;
　　 
    @Before
    public void init() {
        //1. 聲明配置對象,加載配置文件
        Configuration configuration = new Configuration();
        configuration.configure("hibernate.cfg.xml");
        //2. 將配置文件告訴session工廠
        SessionFactory sessionFactory =     configuration.buildSessionFactory();
        //3. 通過session Factory來獲取session
        session = sessionFactory.openSession();
    }

    /**
     * 向數據庫中添加一條記錄
     */
    @Test
    public void testAdd() {
        // 操作流程:
        // 1.通過session啟動事務
        Transaction transaction = session.beginTransaction();
        // 2.執行持久化操作
        User user = new User("艾格尼絲","女","18977783654");
        Serializable save = session.save(user);
        System.out.println("save: " + save);
        // 3.提交或回滾事務
        transaction.commit();
    }

    /**
     * 從數據庫中刪除一條記錄
     */
    @Test
    public void testDelete() {
        Transaction transaction = session.beginTransaction();
//        String sql = "delete from User where uid = :uid"; //第二種刪除方式
//        Query query = session.createQuery(sql);
//        query.setParameter("uid",1);
//        query.executeUpdate();
        //先從數據庫查出來對象
        User user = session.get(User.class,3);
        //再進行刪除
        session.delete(user);
        transaction.commit();
    }

    /**
     * 測試修改數據
     */
    @Test
    public void testUpdate() {
        Transaction transaction = session.beginTransaction();
        // 1.從數據庫中獲取需要修改的對象
        User user =session.get(User.class, 3);
        // 2.對該對象中的數據進行修改
        user.setUsername("李小龍");
        // 3.將修改后的對象更新到數據庫中
        session.update(user);
        transaction.commit();
    }

    /**
     * 測試查詢數據
     */
    @Test
    public void testQuery() {
        Transaction transaction = session.beginTransaction();
        //根據用戶編號進行查詢
        User user = session.get(User.class, 3);
        System.out.println(user.getUsername());
        transaction.commit();
    }

}