SpringBoot 整合 Mybatis 和 Mysql （详细版）

结构如下

1、引入相关依赖

<!--mysql-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.46</version>
</dependency>
<!--druid连接池-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.29</version>
</dependency>
<!--mybatis-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

2、配置application.yml文件

server:
  port: 80
  servlet:
    context-path:

spring:
  # 配置文件选择(dev，pro)
  profiles:
   　active: dev

  # 国际化（消息源自动配置,springboot默认找出messages）
  messages:
     basename: i18n.messages

  datasource:
  　　driver-class-name: com.mysql.jdbc.Driver
  　　url: jdbc:mysql://127.0.0.1:3306/fallenfairy?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
 　　 username: root
  　　password: admin
  　　type: com.alibaba.druid.pool.DruidDataSource

mybatis:

  #  mapper文件
  mapper-locations: mapper/*/*Mapper.xml
  #  实体类
  type-aliases-package: com.fallenfairy.*.pojo

3、启动类添加@MapperScan注解

@SpringBootApplication
@MapperScan("com.fallenfairy.*.dao")
public class FallenfairyApplication {
    public static void main(String[] args) {
        SpringApplication.run(FallenfairyApplication.class, args);
    }
}

6、编写mapper.xml文件

<?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.example.demo.dao.UserDAO">
    <!--id对应UserDAO接口方法名-->
    <!--parameterType对应参数类型-->
    <!--resultType对应返回值类型-->
    <!--注意sql语句字段和数据库对应-->
    <select id="getUserById" parameterType="int" resultType="com.example.demo.pojo.User">
        SELECT * FROM user WHERE id = #{id}
    </select>
</mapper>

7、编写controller测试

/**
 * Copyright (C), 2017-2018, XXX有限公司
 * FileName: UserController
 * Author:   丶Zh1Guo
 * Date:     2018/11/21 16:51
 * Description: user控制器
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名
 * 〈一句话功能简述〉<br>
 * 〈user控制器〉
 *
 * @author 丶Zh1Guo
 * @create 2018/11/21
 * @since 1.0.0
 */
@RestController
public class UserController {
    @Autowired
    private UserDAO userDAO;
　　// url: xxx/user?id=1
    @RequestMapping("/user")
    public User getUser(@RequestParam("id") int id){
        return userDAO.getUserById(id);
    }
　　// url: xxx/user/1
    @RequestMapping("/user/{id}")
    public User getUser2(@PathVariable int id){
        return userDAO.getUserById(id);
    }
}

8、启动服务测试

测试第一种@RequestParam("id") int id：

测试第二种@PathVariable int id：

若访问报错如下：

mysql运行报The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone

设置数据库时区为东八区即可

设置数据库连接：(增加:&serverTimezone=GMT%2B8)

driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/flexo?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
username: root
password: admin

或修改数据时区：

ok