1.导入依赖
在pom.xml中添加依赖
<!-- mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- druid连接-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
2.编写配置文件
2.1 准备实体类
可以在IDEA中添加database，通过两张表，可以直接创建在entity包中的实体类
连接上数据库后
这样就创建了Air和District两个类
Air.java
@Data
public class Air {
private long id;
private long districtId;
private java.sql.Date monitorTime;
private long pm10;
private long pm25;
private String monitoringStation;
private java.sql.Date lastModifyTime;
}
District.java
@Data
public class District {
private long id;
private String name;
}
2.2 准备mapper接口
import com.company.firstspringboot.entity.Air;
import java.util.List;
public interface AirMapper {
List<Air> findAll();
}
在启动类中加入扫描AriMapper接口所在的包
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan(basePackages = "com.company.firstspringboot.mapper")
public class FirstSpringbootApplication {
public static void main(String[] args) {
SpringApplication.run(FirstSpringbootApplication.class, args);
}
}
2.3 准备映射文件，创建对应mapper接口的映射文件
AirMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.company.first-springboot.mapper.AirMapper"> <select id="findAll" resultType="Air"> select * from air </select> </mapper>
添加yml配置信息（指定连接数据库信息和mybatis配置）
application.yml
server:
port: 8080
servlet:
context-path: /
# 连接数据库的信息
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://air?serverTimeZone=UTC
username: root
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
# MyBatis配置
mybatis:
# 扫描映射文件
mapper-locations: classpath:mapper/*.xml
# 配置别名扫描的包
type-aliases-package: com.company.firstspringboot.entity
configuration:
# 开启驼峰映射配置
map-underscore-to-camel-case: true
3.测试
直接在接口上选择GO TO
原文：https://www.cnblogs.com/GumpYan/p/14752447.html