springboot2.1入门系列五 springboot项目使用Mybatis

本文为Spring Boot2.1系列的第五篇，代码可以从github下载 https://github.com/yinww/demo-springboot2.git

本章介绍Springboot 使用Mybatis。

一、准备数据库

create database demo005;

create table user
(
   id                   bigint not null,
   name            varchar(64),
   primary key (id)
)
ENGINE = InnoDB
DEFAULT CHARSET = utf8;

二、创建工程demo005

pom.xml的内容为

    4.0.0
    
        com.yinww
        demo-springboot2
        0.0.1-SNAPSHOT
    
    demo005

    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        
        
            mysql
            mysql-connector-java
            runtime
        
    

三、Java代码

主类

package com.yinww.demo.springboot2.demo005;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Demo005Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo005Application.class, args);
    }

}

User类

package com.yinww.demo.springboot2.demo005.domain;

public class User {

    private Long id;
    private String name;

    // getter and setter

}

UserMapper

package com.yinww.demo.springboot2.demo005.mapper;

import org.apache.ibatis.annotations.Mapper;

import com.yinww.demo.springboot2.demo005.domain.User;

@Mapper
public interface UserMapper {

    void addUser(User user);

}

UserService

package com.yinww.demo.springboot2.demo005.service;

import com.yinww.demo.springboot2.demo005.domain.User;

public interface UserService {
    
    void addUser(User user);

}

UserServiceImpl

package com.yinww.demo.springboot2.demo005.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.yinww.demo.springboot2.demo005.domain.User;
import com.yinww.demo.springboot2.demo005.mapper.UserMapper;
import com.yinww.demo.springboot2.demo005.service.UserService;

@Service
public class UserServiceImpl implements UserService {
    
    @Autowired
    private UserMapper userMapper;

    @Override
    public void addUser(User user) {
        userMapper.addUser(user);
    }

}

Controller， 提供了一个存储数据的接口

package com.yinww.demo.springboot2.demo005.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.yinww.demo.springboot2.demo005.domain.User;
import com.yinww.demo.springboot2.demo005.service.UserService;

@RestController
public class UserController {
    
    @Autowired
    private UserService userService;
    
    @RequestMapping("add")
    public Object addUser() {
        User user = new User();
        user.setId(new Long(1));
        user.setName("张三丰");
        userService.addUser(user);
        return "ok";
    }

}

四、配置文件

UserMapper.xml

    
        
        
    

    
        insert into user (id, name) values(#{id}, #{name})
    

application.properties 主要配置redis

spring.application.name=demo005

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/demo005?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=root

mybatis.typeAliasesPackage=com.yinww.demo.springboot2.demo005.domain
mybatis.mapperLocations=classpath:mapper/*.xml

 

五、运行

执行

java -jar demo005-0.0.1-SNAPSHOT.jar

也可以以其他方式启动。

添加数据

查看数据库，可以看到数据已经保存成功

mysql> select * from user;
+----+-----------+
| id | name      |
+----+-----------+
|  1 | 张三丰    |
+----+-----------+
1 row in set (0.00 sec)

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