mybatis一对多插入数据

user表、

CREATE TABLE `user` (
  `user_id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

role表、

CREATE TABLE `role` (
  `role_id` int(11) NOT NULL AUTO_INCREMENT,
  `role_name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`role_id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

user_role表

CREATE TABLE `user_role` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) DEFAULT NULL,
  `role_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `user_id` (`user_id`),
  KEY `role_id` (`role_id`),
  CONSTRAINT `role_id` FOREIGN KEY (`role_id`) REFERENCES `role` (`role_id`),
  CONSTRAINT `user_id` FOREIGN KEY (`user_id`) REFERENCES `user` (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

dao、mapper都是反向生成的。

springBoot的Application类

package com.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("com.demo.dao")
@SpringBootApplication
public class Application {

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

}
 

controller代码

package com.demo.controller;

import java.util.ArrayList;
import java.util.List;

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

import com.demo.dao.UserMapper;
import com.demo.dao.UserRoleMapper;
import com.demo.domain.User;
import com.demo.domain.UserRole;

@RestController
public class AController {
    
    @Autowired
    private UserMapper userMapper;
    
    @Autowired
    private UserRoleMapper userRoleMapper;
    
    @RequestMapping("/asd")
    public void a() {
        User user = new User();
        user.setUserName("hahaha");
        userMapper.insert(user);
        System.out.println(user.getUserId());
        
        List lists = new ArrayList<>();
        lists.add(1);
        lists.add(2);
        lists.add(3);
        
        for(Integer list:lists) {
            UserRole userRole = new UserRole();
            userRole.setUserId(user.getUserId());
            userRole.setRoleId(list);
            userRoleMapper.insert(userRole);
        }
        
        System.out.println("ok");
    }
}
 

为了测试，就没有写service层，controller直接调用dao。

运行结果，直接上图片。