JAVA SpringBoot中使用mybatis_springboot mybatis mapper在java中-优快云博客

本文链接：https://blog.youkuaiyun.com/kinber/article/details/107600913

本文详细介绍了如何在SpringBoot项目中整合MyBatis框架，包括依赖引入、数据源配置、实体类创建、Mapper接口定义、控制器编写及启动类设置，为开发者提供了一个完整的示例。

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1、在pom.xml中引用依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>

2、在Application.yml中配置数据源

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/dbname?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=PRC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver

3、创建Entify

package com.example.demo.entity;

public class UserEntity {
    private String user_name;
    private String tel;

    public String getTel() {
        return tel;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
}

4、创建Mapper

package com.example.demo.mapper;

import com.example.demo.entity.UserEntity;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface UserMapper {
    @Select("Select user_name,tel From user where tel =  #{tel}")
    List<UserEntity> findByName(@Param("tel") String tel);

    @Insert("Insert Into user (tel,user_name) Values(#{tel},#{user_Name})")
    int insert(@Param("tel") String tel, @Param("user_Name") String user_Name);
}

注：Mapper使用的是interface接口

5、写控制器

package com.example.demo.controller;

import com.alibaba.fastjson.JSONArray;
import com.example.demo.entity.UserEntity;
import com.example.demo.mapper.UserMapper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Map;

@RestController
@MapperScan("com.example.demo.mapper")
public class UserController {
    @Autowired
    private UserMapper userMapper;

    @RequestMapping("/addUser")
    public String addUser(String userName,String tel){
        return userMapper.insert(tel,userName) >0?"success":"fail";
    }

    @RequestMapping("/getUser")
    public List<UserEntity> getUser(String tel){

        List<UserEntity> dataList = (List<UserEntity>) userMapper.findByName(tel);
        return dataList;
    }
}

说明：实现相应的逻辑是通过调用Mapper中对应的方法

6、创建SpringBootApplication

package com.example.demo;

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

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

注：@MapperScan("com.example.demo.mapper")此项需要添加，框架默认找不到Mapper