Springboot 使用Mybatis对postgreSQL实现CRUD

目录结构

1、创建一个springboot项目

选择Web、Mabatis、postgreSQL

2、在application中写入配置文件

1 #配置数据源
2 spring.datasource.platform=postgres
3 spring.datasource.url=jdbc:postgresql://127.0.0.1:5432/postgres
4 spring.datasource.username=postgres
5 spring.datasource.password=123456
6 spring.datasource.driverClassName=org.postgresql.Driver

　　写入完成后，org.postgresql.Driver会报错（可以不管）。原因是postgresql这个jar包依赖类型默认是runtime（运行时生效），所以并不影响代码的运行。

　　修改方法：

　　右键点击项目——选择“open module settings”——点击“Dependencies”，找到Maven：org.postgresql：postgresql：42.2.5将runtime修改为Compile

3、创建一个实例化的实体类

首先在postgreSQL数据库中新建一个表table_one，并创建一个BeanUser的实体类。

 1 package com.example.bean;
 2 
 3 public class BeanUser {
 4 
 5     private Integer id;
 6     private String user_name;
 7     private String pass_word;
 8 
 9     public Integer getId() {
10 
11         return id;
12 
13     }
14 
15     public void setId(Integer id) {
16 
17         this.id = id;
18 
19     }
20 
21     public String getUser_name() {
22 
23         return user_name;
24 
25     }
26 
27     public void setUser_name(String user_name) {
28 
29         this.user_name = user_name;
30 
31     }
32 
33     public String getPass_word() {
34 
35         return pass_word;
36 
37     }
38 
39     public void setPass_word(String pass_word) {
40 
41         this.pass_word = pass_word;
42 
43     }
44 }
45 
46

4、创建一个对表CRUD的实体类

 1 package com.example.mapper;
 2 
 3 import com.example.bean.BeanUser;
 4 
 5 import org.apache.ibatis.annotations.*;
 6 
 7  
 8 
 9 //指定这是一个操作数据库的mapper
10 
11 @Mapper
12 
13 public interface BeanUserMapper {
14 
15  
16 
17     //查询
18 
19     @Select("select * from table_one where id=#{id}")
20 
21     public BeanUser selectId(Integer id);
22 
23  
24 
25     //删除
26 
27     @Delete("delete from table_one where id=#{id}")
28 
29     public int deleteId(Integer id);
30 
31  
32 
33     //插入
34 
35     @Insert("insert into table_one(id,user_name,pass_word) values(#{id},#{user_name},#{pass_word})")
36 
37     public int insertBean(BeanUser beanUser);
38 
39  
40 
41     //修改
42 
43     @Update("update table_one set user_name=#{user_name},pass_word=#{pass_word} where id=#{id}")
44 
45     public int UpdateBean(BeanUser beanUser);
46 
47 }

5、创建一个controller控制器

接收和处理客户端的请求

 1 package com.example.controller;
 2 
 3 import com.example.bean.BeanUser;
 4 
 5 import com.example.mapper.BeanUserMapper;
 6 
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 
 9 import org.springframework.web.bind.annotation.PathVariable;
10 
11 import org.springframework.web.bind.annotation.RequestMapping;
12 
13 import org.springframework.web.bind.annotation.RestController;
14 
15  
16 @RestController
17 
18 public class ControllerBean {
19 
20     @Autowired
21 
22     BeanUserMapper beanUserMapper;
23 
24     //查询
25 
26     @RequestMapping("/get/{id}")
27 
28     public BeanUser getBeanUser(@PathVariable("id") Integer id){
29 
30         return beanUserMapper.selectId(id);
31 
32     }
33     //插入
34 
35     @RequestMapping("/insert")
36 
37     public BeanUser insertBeanUser(BeanUser beanUser){
38 
39         beanUserMapper.insertBean(beanUser);
40 
41         return beanUser;
42 
43     }
44     //修改
45 
46     @RequestMapping("/update")
47 
48     public BeanUser updateBeanUser(BeanUser beanUser){
49 
50         beanUserMapper.UpdateBean(beanUser);
51 
52         return beanUser;
53 
54     }
55     //删除
56 
57     @RequestMapping("/delete/{id}")
58 
59     public String deleteBeanUser(@PathVariable("id")Integer id){
60 
61          beanUserMapper.deleteId(id);
62 
63          return "删除成功！";
64 
65     }
66 }