SpringBoot集成MyBatis小记

参考MyBatis官网

1. 添加maven依赖

添加到pom.xml

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.0</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

2. 配置MySQL连接

编辑application.properties这个文件,我用的xampp中的MySQL所以root密码为空,我的数据库名字叫"discuss"

spring.datasource.url=jdbc:mysql://localhost/discuss?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

到此为止MyBatis就算是整合进来了,下面我们来测试一下是否成功

验证

在数据库中添加一个user的表

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(100) DEFAULT NULL,
  `password` varchar(100) DEFAULT NULL,
  `nickname` varchar(100) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

编写一个User的model

public class User {
    private Integer id;
    private String username;
    private String password;
    private String nickname;
}

包含了id,username,password,nickname这四个属性,请自行alt+insert生成getter和setter方法

编写一个mapper

@Mapper
public interface UserMapper {
    //@Select("SELECT id,username,password,nickname FROM USER")
    //User find();
    @Insert("INSERT INTO USER (USERNAME,PASSWORD,NICKNAME) VALUES(#{username},#{password},#{nickname})")
    void insert(User user);

}

在Controller中添加一个测试方法

首先要注入mapper

    @Autowired
    UserMapper userMapper;

    @RequestMapping("/addUser")
    public String add(){
        User user = new User();
        user.setUsername("admin");
        user.setPassword("admin123");
        user.setNickname("管理员");
        userMapper.insert(user);
        return "index";
    }

之后浏览器访问:"http://localhost:8080/addUser"
再查看数据库中的user表,如果有数据说明我们MyBatis整合成功

注意点

1. 连接MySQL数据库时一定要指定好时区和编码,不然会报错
2. 之前开发SSM时习惯于将Controller统一放到包里,但是Spring Boot默认却无法识别提示conflict,只能暂时将controller跟SpringBootApplication放到同一目录