SpringBoot MyBatis怎么快速入门

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一、MyBatis简介

MyBatis 是一款优秀的持久层框架，它支持自定义 SQL、存储过程以及高级映射。MyBatis 免除了几乎所有的 JDBC 代码以及设置参数和获取结果集的工作。MyBatis 可以通过简单的 XML 或注解来配置和映射原始类型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 对象）为数据库中的记录。

二、MyBatis使用步骤

1、MyBatis工程总体目录结构

2、创建简单的SpringBoot工程

3、添加MyBatis依赖

                      mysql            mysql-connector-java            5.1.32                            org.mybatis            mybatis            3.4.6        

4、在数据库创建USER表

CREATE TABLE `user` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `username` varchar(20) NOT NULL  DEFAULT "" COMMENT "用户名",  `password` varchar(50) NOT NULL DEFAULT "" COMMENT "密码",  PRIMARY KEY (`id`) USING BTREE) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 ROW_FORMAT=DYNAMIC;

5、在application.properties配置数据库连接信息

#数据库相关配置spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useSSL=false&characterEncoding=utf8&allowMultiQueries=true&serverTimezone=Asia/Shanghai&useAffectedRows=truespring.datasource.username=rootspring.datasource.password=QQ796413#mybaits配置#mapper加载路径mybatis.mapper-locations= classpath:mapper/*.xml#实体包位置mybatis.type-aliases-package= com.example.mybatisdemo.entity#myatbis配置文件mybatis.config-location= classpath:mybatis-config.xml

6、创建USER表对应的实体类

package com.example.mybatisdemo.entity;public class User {    private int id;    private String username;    private String password;    public int getId() {        return id;    }    public void setId(int 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;    }    @Override    public String toString() {        return "User{" +                "id=" + id +                ", username="" + username + """ +                ", password="" + password + """ +                "}";    }

7、在mapper/UserMapper创建UserMapper.java

package com.example.mybatisdemo.mapper;import com.example.mybatisdemo.entity.User;import org.apache.ibatis.annotations.Mapper;@Mapperpublic interface UserMapper{     User findUserById(Integer id);}

8、在service/UserService新建UserService.java

package com.example.mybatisdemo.service;import com.example.mybatisdemo.entity.User;public interface UserService {    User findUserById(Integer id);}

9、在service/impl/UserServiceImpl 创建UserServiceImpl.java

package com.example.mybatisdemo.service.impl;import com.example.mybatisdemo.entity.User;import com.example.mybatisdemo.mapper.UserMapper;import com.example.mybatisdemo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class UserServiceImpl implements UserService {        @Autowired        private UserMapper userMapper;        @Override        public User findUserById(Integer id) {            return userMapper.findUserById(id);        }}

10、在resources下新建mybatis-conf.xml

11、在resources下mapper文件下创建UserMapper.xml

                                                    select             id,             username,             password        from             user        where             id= #{id,jdbcType=INTEGER}    

12、创建UserController.java

package com.example.mybatisdemo.controller;import com.example.mybatisdemo.entity.User;import com.example.mybatisdemo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class UserController {    @Autowired    UserService userService;    @GetMapping("/findUserById")    public User findUserById(@RequestParam Integer id){       return userService.findUserById(1);    }}

13、测试

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