批量删除也就是同时删除多条数据,首先要把所需要的数据选中, 批量删除它与删除的功能是一样的，只是它们删除的条数不同而已。当然批量删除的逻辑和知识点多，会比删除复杂一点。批量删除需要一个变量来接收返回值，然后获取选中行数据，再把选中行数据中的id获取到并把所有获取到的id进行拼接。确定用户选中了要删除的数据。判断返回来的值的长度，长度大于0说明用户已经选中要删除的数据，否则就提醒用户选择需要删除的数据，删除成功后刷新表格，提醒用户已删除成功！

准备工作

MySQL数据库表

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(30) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `pwd` varchar(30) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=14 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

Result返回结果

package com.zhang.springboot.common;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Result<T> {
    private String code;
    private String msg;
    private T data;

    public static Result succeed(){
        return new Result(Constants.CODE_200,"成功",null);
    }
    public static Result succeed(Object data){
        return new Result(Constants.CODE_200,"成功",data);
    }
    public static Result succeed(String msg, Object data){
        return new Result(Constants.CODE_200,msg,data);
    }
    public static Result succeed(String code, String msg,Object data) {
        return new Result(Constants.CODE_200,msg,data);
    }

    public static Result error(String code, String msg,Object data){
        return new Result(code,msg,null);
    }


    public static Result error(String code, String msg) {
        return new Result(code,msg,msg);
    }
}

1、SpringBoot+MyBatisPlus+vue+ElementUl实现批量删除

1.1、演示GIF动态图

在这里插入图片描述

1.2、实体类

package com.zhang.springboot.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("user")
public class User {
    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;
    private String name;
    private String pwd;
}

1.3、Dao接口

package com.zhang.springboot.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.zhang.springboot.entity.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {

}

1.4、Service接口

package com.zhang.springboot.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.zhang.springboot.entity.User;
public interface UserService extends IService<User> {

}

1.5、ServiceImpl接口实现层

package com.zhang.springboot.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhang.springboot.entity.User;
import com.zhang.springboot.mapper.UserMapper;
import com.zhang.springboot.service.UserService;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

}

1.6、Controller控制层

package com.zhang.springboot.controller;

import com.zhang.springboot.common.Constants;
import com.zhang.springboot.common.Result;
import com.zhang.springboot.entity.User;
import com.zhang.springboot.mapper.UserMapper;
import com.zhang.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;


@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    
    /**MyBatisPlus实现批量删除*/
    @PostMapping("/del")
    public boolean del(@RequestBody List<String> ids){
        return userService.removeByIds(ids);
    }
    /**查出所有数据*/
      @PostMapping("/listUser")
    public Result listUser(){
       List<User> listAll =  userService.list();
       return Result.succeed(Constants.CODE_200,"渲染成功",listAll);
    }
}

1.7、Vue前端

<template>
    <el-popconfirm
                  class="ml-5"
                  confirm-button-text='好的'
                  cancel-button-text='不用了'
                  icon="el-icon-info"
                  icon-color="red"
                  title="您确定删除吗？"
                  @confirm="delBath">
            <el-button plain class="el-icon-circle-close" type="danger" slot="reference">批量删除</el-button>
          </el-popconfirm>
    
     <el-table :data="tableData" border header-cell-class-name="header" @selection-change="handleSelectionChange">
          <el-table-column type="selection" width="55"></el-table-column>
          <el-table-column type="index" label="序号" width="140">
          </el-table-column>
          <el-table-column prop="name" label="用户账号" width="140">
          </el-table-column>
          <el-table-column prop="pwd" label="用户密码" width="140">
          </el-table-column>
          <el-table-column label="操作"></el-table-column>
        </el-table>
</template>

<script>
  export default {
    name: "User",
    data(){
      return{
        tableData: [],
        ids: [],
      }
    },
    mounted() {
      this.load()
    },
    methods:{
      handleSelectionChange(val){
        this.ids = val.map(v => v.id)
        this.$message.warning("选择了"+this.ids.length+"条数据");
      },

      load(){
        this.request.post("/user/listUser").then((res) => {
          this.tableData = res.data;
        })
      },

    delBath(){
        if (!this.ids.length) {
          this.$message.warning("请选择数据！")
          return
        }
        this.request.post("/user/del",this.ids).then(res =>{
          if(res){
            this.$message.success("MyBatisPlus批量删除成功！");
            this.load()
          }else{
            this.$message.error("删除失败！");
          }
        })
      },
    }
  }
</script>
<style scoped>

</style>

2、SpringBoot+MyBatis+vue+ElementUl实现批量删除

2.1、演示GIF动态图

在这里插入图片描述

2.2、实体类

package com.zhang.springboot.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("user")
public class User {
//    @TableId(type = IdType.ASSIGN_UUID)
    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;
    private String name;
    private String pwd;
}

2.3、Dao接口

    package com.zhang.springboot.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.zhang.springboot.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import java.util.List;

@Mapper
public interface UserMapper{
    /**查询全部*/
    List<User> listAll();
    
    /**批量删除*/
    int deleteByIds(@Param("flowIds") Integer[] flowIds);
}

2.4、写SQL的xml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.zhang.springboot.mapper.UserMapper">

    <!--多选删除-->
    <delete id="deleteByIds" parameterType="Integer">
        delete from user where id in
        <foreach collection="flowIds" item="id" open="(" separator="," close=")">
            #{id}
        </foreach>
    </delete>


    <select id="listAll" resultType="com.zhang.springboot.entity.User">
        select * from user
    </select>

</mapper>

2.5、Service接口

package com.zhang.springboot.service;

import com.zhang.springboot.common.Result;
public interface UserService{
    Result listAll();//查询全部
    
    Result deleteByIds(Integer[] flowIds);//批量删除
}

2.6、ServiceImpl接口实现层

package com.zhang.springboot.service.impl;

import com.zhang.springboot.common.Result;
import com.zhang.springboot.entity.User;
import com.zhang.springboot.mapper.UserMapper;
import com.zhang.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    
    /***
     * 查询全部
     */
    @Override
    public Result listAll() {
        List<User> listAll= userMapper.listAll();
        return Result.succeed(Constants.CODE_200,"查出全部成功",listAll);
    }

    /***
     * 批量删除
     */
    public Result deleteByIds(Integer[] flowIds) {
        userMapper.deleteByIds(flowIds);
        return Result.succeed(Constants.CODE_200,"批量删除成功");
    }
}

2.7、Controller控制层

package com.zhang.springboot.controller;

import com.zhang.springboot.common.Result;
import com.zhang.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

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

    /**批量删除*/
    @GetMapping("/delEmps/{ids}")
    public Result delEmp(@PathVariable("ids") Integer[] ids){
        return userService.deleteByIds(ids);
    }

    /**查询全部*/
    @PostMapping("/listUser")
    public Result listUser(){
        return userService.listAll();
    }

}

2.8、Vue前端

<template>
    <el-popconfirm
                  class="ml-5"
                  confirm-button-text='好的'
                  cancel-button-text='不用了'
                  icon="el-icon-info"
                  icon-color="red"
                  title="您确定删除吗？"
                  @confirm="delBath">
            <el-button plain class="el-icon-circle-close" type="danger" slot="reference">批量删除</el-button>
          </el-popconfirm>
    
     <el-table :data="tableData" border header-cell-class-name="header" @selection-change="handleSelectionChange">
          <el-table-column type="selection" width="55"></el-table-column>
          <el-table-column type="index" label="序号" width="140">
          </el-table-column>
          <el-table-column prop="name" label="用户账号" width="140">
          </el-table-column>
          <el-table-column prop="pwd" label="用户密码" width="140">
          </el-table-column>
          <el-table-column label="操作"></el-table-column>
        </el-table>
</template>

<script>
  export default {
    name: "User",
    data(){
      return{
        tableData: [],
        ids: [],
      }
    },
    mounted() {
      this.load()
    },
    methods:{
      handleSelectionChange(val){
        this.ids = val.map(v => v.id)
        this.$message.warning("选择了"+this.ids.length+"条数据");
      },

      load(){
        this.request.post("/user/listUser").then((res) => {
          this.tableData = res.data;
        })
      },

        delBath(){
          if (!this.ids.length) {
            this.$message.warning("请选择数据！")
            return
          }
          this.request.get("/user/delEmps/"+this.ids).then(res =>{
          this.$message.success("MyBatis批量删除成功！");
          this.load()
        })
      },
</script>
<style scoped>

</style>

SpringBoot+MyBatis和MyBatisPlus+vue+ElementUl实现批量删除