Hibernate的入门(增删改查):

Posted 2021-01-10 glacial_water

注意：本次的记录是在上一篇Hibernate入门的基础上应用的

1.目录

2.实体类修改

 1 package com.itheima.domain;
 2 
 3 /*
 4  * 客户的javaBean
 5  * @author chenyanlong
 6  */
 7 public class Customer {
 8     private Long cust_id;
 9     private String cust_name;
10     private Long cust_user_id;
11     private Long cust_create_id;
12     private String cust_source;
13     private String cust_industry;
14     private String cust_level;
15     private String cust_linkman;
16     private String cust_phone;
17     private String cust_mobile;
18     public Long getCust_id() {
19         return cust_id;
20     }
21     public void setCust_id(Long cust_id) {
22         this.cust_id = cust_id;
23     }
24     public String getCust_name() {
25         return cust_name;
26     }
27     public void setCust_name(String cust_name) {
28         this.cust_name = cust_name;
29     }
30     public Long getCust_user_id() {
31         return cust_user_id;
32     }
33     public void setCust_user_id(Long cust_user_id) {
34         this.cust_user_id = cust_user_id;
35     }
36     public Long getCust_create_id() {
37         return cust_create_id;
38     }
39     public void setCust_create_id(Long cust_create_id) {
40         this.cust_create_id = cust_create_id;
41     }
42     public String getCust_source() {
43         return cust_source;
44     }
45     public void setCust_source(String cust_source) {
46         this.cust_source = cust_source;
47     }
48     public String getCust_industry() {
49         return cust_industry;
50     }
51     public void setCust_industry(String cust_industry) {
52         this.cust_industry = cust_industry;
53     }
54     public String getCust_level() {
55         return cust_level;
56     }
57     public void setCust_level(String cust_level) {
58         this.cust_level = cust_level;
59     }
60     public String getCust_linkman() {
61         return cust_linkman;
62     }
63     public void setCust_linkman(String cust_linkman) {
64         this.cust_linkman = cust_linkman;
65     }
66     public String getCust_phone() {
67         return cust_phone;
68     }
69     public void setCust_phone(String cust_phone) {
70         this.cust_phone = cust_phone;
71     }
72     public String getCust_mobile() {
73         return cust_mobile;
74     }
75     public void setCust_mobile(String cust_mobile) {
76         this.cust_mobile = cust_mobile;
77     }
78     @Override
79     public String toString() {
80         return "Customer [cust_id=" + cust_id + ", cust_name=" + cust_name + ", cust_user_id=" + cust_user_id
81                 + ", cust_create_id=" + cust_create_id + ", cust_source=" + cust_source + ", cust_industry="
82                 + cust_industry + ", cust_level=" + cust_level + ", cust_linkman=" + cust_linkman + ", cust_phone="
83                 + cust_phone + ", cust_mobile=" + cust_mobile + "]";
84     }
85 
86     
87 }

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3.HibernateUtils.java

 1 package com.itheima.utils;
 2 
 3 import javax.servlet.jsp.jstl.core.Config;
 4 
 5 import org.hibernate.Session;
 6 import org.hibernate.SessionFactory;
 7 import org.hibernate.cfg.Configuration;
 8 
 9 /*
10  * Hibernate框架的工具
11  * @author chenyanlong
12  */
13 public class HibernateUtils {
14 
15     //Curl+shift+x
16     private static final Configuration CONFIG;
17     private static final SessionFactory FACTORY;
18     
19     //编写静态代码
20     static {
21         //加载配置文件
22         CONFIG =new Configuration().configure();
23         //构造工厂
24         FACTORY=CONFIG.buildSessionFactory();
25     }
26     
27     /*
28      * 从工厂获取Session对象
29      * @return
30      */
31     public static Session getSession() {
32         return FACTORY.openSession();
33         
34     }
35 }

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4. 保存数据

 1 /*
 2      * 1 保存数据
 3      */
 4     @Test
 5     public void testSave(){
 6         /*
 7          * 1.先加载配置文件
 8          * 2.创建SessionFactory对象，生成Session对象
 9          * 3.创建Sesison对象
10          * 4.开启事务
11          * 5.编写保存代码
12          * 6.提交事务
13          * 7.释放资源
14          */
15         
16         //1.加载配置文件
17         Configuration config=new Configuration();
18         //默认加载src目录下hibernate.cfg.xml的配置文件
19         config.configure();
20         //2.创建SessionFactory对象
21         SessionFactory factory=config.buildSessionFactory();
22         //3.创建session对象
23         Session session=factory.openSession();
24         //4.开启事务
25         Transaction tr=  session.beginTransaction();
26         
27         //5.编写保存代码
28         Customer customer = new Customer();
29         customer.setCust_name("小李");
30         customer.setCust_source("小广告");
31 
32         
33         session.save(customer);
34         //6.提交事务
35         tr.commit();
36         
37         //7.释放资源
38         session.close();
39         factory.close();
40     }
41     

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5.测试工具类

 1     /*
 2      * 2 测试工具类
 3      */
 4     @Test
 5     public void testSave2(){
 6         //原来:加载配置文件，获取Factory对象，获取Session
 7         Session session=HibernateUtils.getSession();
 8         Transaction tr=session.beginTransaction();
 9         Customer c=new  Customer();
10         c.setCust_name("小陈");
11         session.save(c);
12         
13         //提交事务
14         tr.commit();
15         //释放资源
16         session.close();
17         
18     }

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6.测试get()方法

 1     /*
 2      * 3 测试get()方法,获取查询，通过主键查询一条记录
 3      */
 4     @Test
 5     public void testSave3(){
 6         //原来:加载配置文件，获取Factory对象，获取Session
 7         Session session=HibernateUtils.getSession();
 8         Transaction tr=session.beginTransaction();
 9         
10         //测试查询的两个参数，arg0查询javaBean的class对象，arg1主键的值
11         Customer c=session.get(Customer.class, 95L);
12         System.out.println(c);
13         
14         
15         //提交事务
16         tr.commit();
17         //释放资源
18         session.close();    
19     }

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7.删除方法

 1     /*
 2      * 4 测试删除的方法
 3      * 注意:删除或者修改，先查询再删除或者修改
 4      */
 5     @Test
 6     public void testDel(){
 7         //原来:加载配置文件，获取Factory对象，获取Session
 8         Session session=HibernateUtils.getSession();
 9         Transaction tr=session.beginTransaction();
10         
11         //测试查询的两个参数，arg0查询javaBean的class对象，arg1主键的值
12         Customer c=session.get(Customer.class, 95L);
13         System.out.println(c);
14         
15         //删除客户
16         session.delete(c);
17         
18         //提交事务
19         tr.commit();
20         //释放资源
21         session.close();    
22     }
23     

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8.测试修改

 1 /*
 2      *5 测试修改
 3      */
 4     @Test
 5     public void testUpdate(){
 6         //原来:加载配置文件，获取Factory对象，获取Session
 7         Session session=HibernateUtils.getSession();
 8         Transaction tr=session.beginTransaction();
 9         
10         //测试查询的两个参数，arg0查询javaBean的class对象，arg1主键的值
11         Customer c=session.get(Customer.class, 94L);
12         System.out.println(c);
13         
14         //设置客户信息
15         c.setCust_name("小龙虾");
16         
17         //修改或是更新
18         session.update(c);
19         
20         //session.saveOrUpdate(c); 添加或是修改
21         //提交事务
22         tr.commit();
23         //释放资源
24         session.close();    
25     }

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9.测试查询方法

 1 /*
 2      * 测试查询方法
 3      */
 4     @Test
 5     public void testSel() {
 6         //加载配置文件
 7         Session session =HibernateUtils.getSession();
 8         Transaction tr=session.beginTransaction();
 9         
10         //创建查询的接口
11         Query query=session.createQuery("from Customer");
12         
13         //查询所有的数据
14         List<Customer> list=query.list();
15         for(Customer customer:list) {
16             System.out.println(customer);
17         }
18         
19         //提交事务
20         tr.commit();
21         
22         //释放资源
23         session.close();
24         
25     }

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