HM-SpringBoot1.6【SpringBoot整合MyBatis】

 

 

 

 

 

 

 

 

 

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>org.springframework.boot</groupId>
 7         <artifactId>spring-boot-starter-parent</artifactId>
 8         <version>2.5.3</version>
 9         <relativePath/> <!-- lookup parent from repository -->
10     </parent>
11     <groupId>com.haifei</groupId>
12     <artifactId>springboot7-mybatis</artifactId>
13     <version>0.0.1-SNAPSHOT</version>
14     <name>springboot7-mybatis</name>
15     <description>Demo project for Spring Boot</description>
16     <properties>
17         <java.version>1.8</java.version>
18     </properties>
19     <dependencies>
20         <dependency>
21             <groupId>org.mybatis.spring.boot</groupId>
22             <artifactId>mybatis-spring-boot-starter</artifactId>
23             <version>2.2.0</version>
24         </dependency>
25 
26         <dependency>
27             <groupId>mysql</groupId>
28             <artifactId>mysql-connector-java</artifactId>
29             <!--<scope>runtime</scope>-->
30         </dependency>
31         <dependency>
32             <groupId>org.springframework.boot</groupId>
33             <artifactId>spring-boot-starter-test</artifactId>
34             <scope>test</scope>
35         </dependency>
36     </dependencies>
37 
38     <build>
39         <plugins>
40             <plugin>
41                 <groupId>org.springframework.boot</groupId>
42                 <artifactId>spring-boot-maven-plugin</artifactId>
43             </plugin>
44         </plugins>
45     </build>
46 
47 </project>
1 CREATE TABLE `t_user` (
2   `id` int(11) NOT NULL AUTO_INCREMENT,
3   `username` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
4   `password` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
5   PRIMARY KEY (`id`)
6 ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
7 
8 insert  into `t_user`(`id`,`username`,`password`) values (1,'zhangsan','123'),(2,'lisi','234');

 

 

 

 

 

 

 

 

 

 

 

 1 package com.haifei.springboot7mybatis.domain;
 2 
 3 public class User {
 4 
 5     private int id;
 6     private String username;
 7     private String password;
 8 
 9     @Override
10     public String toString() {
11         return "User{" +
12                 "id=" + id +
13                 ", username='" + username + '\'' +
14                 ", password='" + password + '\'' +
15                 '}';
16     }
17 
18     public int getId() {
19         return id;
20     }
21 
22     public void setId(int id) {
23         this.id = id;
24     }
25 
26     public String getUsername() {
27         return username;
28     }
29 
30     public void setUsername(String username) {
31         this.username = username;
32     }
33 
34     public String getPassword() {
35         return password;
36     }
37 
38     public void setPassword(String password) {
39         this.password = password;
40     }
41 }

 

 

1 纯注解开发

 

 

 

 1 application.yml
 2 
 3 
 4 
 5 # 一、配置datasource
 6 spring:
 7   datasource:
 8     # url: jdbc:mysql://localhost:3306/hm_springboot
 9     url: jdbc:mysql://localhost:3306/hm_springboot?serverTimezone=UTC
10     username: root
11     password: root
12     # driver-class-name: com.mysql.jdbc.Driver
13     driver-class-name: com.mysql.cj.jdbc.Driver

 

 

 1 package com.haifei.springboot7mybatis.mapper;
 2 
 3 import com.haifei.springboot7mybatis.domain.User;
 4 import org.apache.ibatis.annotations.Mapper;
 5 import org.apache.ibatis.annotations.Select;
 6 import org.springframework.stereotype.Repository;
 7 
 8 import java.util.List;
 9 
10 @Mapper
11 @Repository
12 public interface UserMapper {
13 
14     @Select("select * from t_user")
15     public List<User> findAll();
16 
17 }
 1 package com.haifei.springboot7mybatis;
 2 
 3 import com.haifei.springboot7mybatis.domain.User;
 4 import com.haifei.springboot7mybatis.mapper.UserMapper;
 5 import org.junit.jupiter.api.Test;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.boot.test.context.SpringBootTest;
 8 
 9 import java.util.List;
10 
11 @SpringBootTest
12 class Springboot7MybatisApplicationTests {
13 
14     @Autowired
15     private UserMapper userMapper; //userMapper编译异常解决：在UserMapper类上加@Repository注解
16 
17     @Test
18     void findAllTest() {
19         List<User> userList = userMapper.findAll();
20         System.out.println(userList);
21     }
22 
23 }

 

 

 

 

2 xml开发

 

 

 

 1 package com.haifei.springboot7mybatis.mapper;
 2 
 3 import com.haifei.springboot7mybatis.domain.User;
 4 import org.apache.ibatis.annotations.Mapper;
 5 import org.springframework.stereotype.Repository;
 6 
 7 import java.util.List;
 8 
 9 @Mapper
10 @Repository
11 public interface UserXmlMapper {
12 
13     public List<User> findAll();
14 
15 }
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
3 
4 <mapper namespace="com.haifei.springboot7mybatis.mapper.UserXmlMapper">
5     <select id="findAll" resultType="user">
6         select * from t_user
7     </select>
8 </mapper>

 

application.yml



# 一、配置datasource
spring:
  datasource:
    # url: jdbc:mysql://localhost:3306/hm_springboot
    url: jdbc:mysql://localhost:3306/hm_springboot?serverTimezone=UTC
    username: root
    password: root
    # driver-class-name: com.mysql.jdbc.Driver
    driver-class-name: com.mysql.cj.jdbc.Driver

# 二、配置mybatis
mybatis:
  # config-location: # 指定mybatis的核心配置文件（sqlMapConfig.xml）路径
  mapper-locations: classpath:mapper/*Mapper.xml # 指定mapper映射文件路径
  type-aliases-package:  com.haifei.springboot7mybatis.domain # 配置别名
 1 package com.haifei.springboot7mybatis;
 2 
 3 import com.haifei.springboot7mybatis.domain.User;
 4 import com.haifei.springboot7mybatis.mapper.UserMapper;
 5 import com.haifei.springboot7mybatis.mapper.UserXmlMapper;
 6 import org.junit.jupiter.api.Test;
 7 import org.springframework.beans.factory.annotation.Autowired;
 8 import org.springframework.boot.test.context.SpringBootTest;
 9 
10 import java.util.List;
11 
12 @SpringBootTest
13 class Springboot7MybatisApplicationTests {
14 
15     @Autowired
16     private UserMapper userMapper; //userMapper编译异常解决：在UserMapper类上加@Repository注解，下同
17 
18     @Autowired
19     private UserXmlMapper userXmlMapper;
20 
21     @Test
22     void findAllTest() {
23         List<User> userList = userMapper.findAll();
24         System.out.println(userList);
25     }
26 
27     @Test
28     void findAllTest2() {
29         List<User> userList = userMapper.findAll();
30         System.out.println("userXmlMapper:" + userList);
31     }
32 
33 }

 

posted @ 2021-07-31 12:08  yub4by  阅读(72)  评论(0)    收藏  举报