IDEA开发SpringBoot+mybatis 新手快速入门

因为最近学习Java  自己练习springboot和mybatis，练习一下

一、IDEA创建springboot项目

2、pom.xml 引用相关文件

<!--web核心依赖-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<!--mysql数据库驱动-->
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.20</version>
</dependency>

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

最终目录结构

开始编写各个生成的文件

实体类文件：

public class User implements Serializable {
    private  Long id;//编号
    private String username;// 用户名
    private  String password;//密码

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

userservice接口

public interface UserService {
    List<User> findAll();
    User getUserByID(int id);
    void  CreateUser(User user);
    void DeleteUser(int id);
    void UpdateUser(User user);
}

UserServiceimpl服务类

@Service("UserService")
public class UserServiceimpl implements UserService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> findAll() {
        return userMapper.findAll();
    }

    public User getUserByID(int id) {
        return userMapper.getUserByID(id);
    }

    public void  CreateUser(User user) {
        userMapper.CreateUser(user);
    }

    public  void DeleteUser(int id)
    {
        userMapper.DeleteUser(id);
    }

    public  void UpdateUser(User user){
        userMapper.UpdateUser(user);
    }
}

mapper接口

@Mapper
public interface UserMapper {
    List<User> findAll();
    User getUserByID(int id);
    void  CreateUser(User user);
    void  DeleteUser(int id);
    void  UpdateUser(User user);
}

Controller类

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/findAll")
    public List<User> findAll(){
        return userService.findAll();
    }

    @RequestMapping("/getUserByID")
    public User getUserByID(Integer id){
        return userService.getUserByID(id);
    }

    @RequestMapping("/CreateUser")
    public  void CreateUser(User user)
    {
        userService.CreateUser(user);
    }

    @RequestMapping("/DeleteUser")
    public  void DeleteUser(Integer id)
    {
     userService.DeleteUser(id);

    }

    @RequestMapping("/UpdateUser")
    public  void  UpdateUser(User user)

    {
      userService.UpdateUser(user);
    }
}

usermapper.xml--对应sql语句文件

<?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.mybatis.mybatis.mapper.UserMapper">
    <sql id="table">tb_user</sql>
    <select id="findAll" resultType="User">
        SELECT * FROM tb_user
    </select>
    <!-- 根据id查询 -->
    <select id="getUserByID" resultType="User">
        SELECT
        *
        FROM
        <include refid="table"/>
        WHERE
        id = #{id}
    </select>

    <select id="CreateUser" parameterType="User">
       insert into
       <include refid="table"/>
        (username,password)
        VALUES
        (#{username},#{username})
    </select>

    <select id ="DeleteUser">
        delete   from
        <include refid="table"/>
        where id =#{id}
   </select>

    <select id ="UpdateUser" parameterType="User">
        update
        <include refid="table"/>
        set username =#{username},password =#{password}
        where id =#{id}
    </select>
</mapper>

application.yml--mybatis以及JDBC配置文件

server:
  port: 6061
spring:
  #数据库连接配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://192.168.0.10:3306/test?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&allowMultiQueries=true&allowPublicKeyRetrieval=true
    username: root
    password: piaost123

#mybatis的相关配置
mybatis:
  #mapper配置文件
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.mybatis.mybatis.entity
  #开启驼峰命名
  configuration:
    map-underscore-to-camel-case: true

开始创建数据库：我用的是mysql 5.6

CREATE TABLE `tb_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

到此，整个环境就全部完成

可以使用Postman测试了

相关知识：

1、MybatisMybatis架构与原理讲解的很细通俗易懂，大家可以看下

https://www.jianshu.com/p/15781ec742f2

2、相关注解以及mybatis相关标签

@Service("UserService")、@Mapper、@RestController、@RequestMapping("/user")、select、include

大家可以查阅相关资料

Java_Mybatis 注解： https://www.cnblogs.com/amiezhang/p/9632711.html

springboot 注解：https://www.cnblogs.com/ldy-blogs/p/8550406.html

demo下载地址：https://download.csdn.net/download/fsdad/12595011