springboot搭建mybatis注解版----连接mysql

1，新建项目

2，配置文件

    

Gradle文件：

compile('org.springframework.boot:spring-boot-starter-web')
compile('org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.2')
runtime('mysql:mysql-connector-java')
// https://mvnrepository.com/artifact/com.alibaba/druid
compile group: 'com.alibaba', name: 'druid', version: '1.1.9'
testCompile('org.springframework.boot:spring-boot-starter-test')

yml文件：

server:
  port: 8080

#公共配置与profiles选择无关 mapperLocations指的路径是src/main/resources
mybatis:
  type-aliases-package: com.meng.entity
 
  
#开发配置
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/db_mybatis
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    # 使用druid数据源
    type: com.alibaba.druid.pool.DruidDataSource

3，数据库设计

CREATE TABLE `tb_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `username` varchar(50) NOT NULL COMMENT '用户名',
  `age` int(11) NOT NULL COMMENT '年龄',
  `ctm` datetime NOT NULL COMMENT '创建时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

4，代码书写

   entity:需要自己生成getter,setter方法，无参构造器和有参构造器，也可以生成toString方法

 

private int id;
private String username;
private int age;
private Date ctm;

    mapper：

public interface UserMapper {
	
	@Select("SELECT * FROM tb_user WHERE id = #{id}")
	User getUserById(Integer id);
}

    service：

@Service
public class UserService {

	@Autowired
	private UserMapper uMapper;
	
	public User getUserByMapperId(Integer id) {
		
		return uMapper.getUserById(id);
	}
	
	
}

    controller：

@RestController
public class UserController {
	
	@Autowired
	private UserService uService;
	
	
	@RequestMapping("/getMapperuser")
	public User getUserBymapper() {
		
		User u = uService.getUserByMapperId(2);		
		return  u;
	}
}

5，效果展示