话不多说，直接整代码

实体类：

package com.example.system03.entity;

import lombok.Data;

import java.io.Serializable;
import java.sql.Timestamp;

@Data
public class Department implements Serializable {
    private String department_name;
    private String manager_name;
    private int manager_id;
    private String department_describe;
    private String status;
    private String is_deleted;
    private Timestamp created_time;
    private String created_by;
    private Timestamp modified_time;
    private String modified_by;
}

mapper类：

package com.example.system03.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.system03.entity.Department;
import com.example.system03.entity.Role;
import com.example.system03.entity.Vo.DepartmentSelectVo;
import com.example.system03.entity.Vo.DepartmentUpdateVo;
import com.example.system03.entity.Vo.RoleSelectVo;
import com.example.system03.service.DepartmentService;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface DepartmentMapper extends BaseMapper<Department> {
    List<Department> queryDepartmentList(@Param("DepartmentSelectVo") DepartmentSelectVo departmentSelectVo, @Param("numStart") int numStart, @Param("numEnd") int numEnd);
    int getLastCount();
    void departmentDelete(@Param("department") Department department);
    Department departmentFind(String department_name);
    void departmentUpdate(@Param("n") DepartmentUpdateVo departmentUpdateVo);
    void departmentInsert(@Param("n") DepartmentUpdateVo departmentUpdateVo);
}

mapper.xml配置文件：

<?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.example.system03.mapper.DepartmentMapper">
    <select id="queryDepartmentList" resultType="com.example.system03.entity.Department">
        select SQL_CALC_FOUND_ROWS *
        from department
        where (department_name like '%${DepartmentSelectVo.filter_department_name}%' or
               #{DepartmentSelectVo.filter_department_name} = '')
          and (is_deleted = '0')
        order by ${DepartmentSelectVo.sort} ${DepartmentSelectVo.sortMethod}
        limit #{numStart}, #{numEnd}
    </select>
    <select id="getLastCount" resultType="integer">
        select FOUND_ROWS()
    </select>
    <update id="departmentDelete">
        update department
        <set>
            is_deleted = "1",
            modified_time = #{department.modified_time},
            modified_by = #{department.modified_by},
            status = #{department.status}
        </set>
        where department_name = #{department.department_name}
    </update>
    <select id="departmentFind" resultType="com.example.system03.entity.Department" parameterType="string">
        select *
        from department
        where department_name = #{department_name};
    </select>
    <update id="departmentUpdate">
        update department
        <set>
            <if test="n.manager_name != null">manager_name = #{n.manager_name},</if>
            <if test="n.manager_id != null">manager_id = #{n.manager_id},</if>
            <if test="n.department_describe != null">department_describe = #{n.department_describe},</if>
            <if test="n.status != null">status = #{n.status},</if>
            modified_by = #{n.modified_by},
            modified_time = #{n.modified_time}
        </set>
        where department_name = #{n.department_name}
    </update>

    <insert id="departmentInsert">
        insert into department (department_name, manager_name, manager_id, department_describe, status, is_deleted, created_time, created_by, modified_time, modified_by)
        values (#{n.department_name}, #{n.manager_name}, #{n.manager_id}, #{n.department_describe},#{n.status},#{n.is_deleted},#{n.created_time},#{n.created_by},#{n.modified_time},#{n.modified_by})
    </insert>
</mapper>

service层：

package com.example.system03.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.system03.entity.Department;
import com.example.system03.entity.Vo.DepartmentSelectVo;
import com.example.system03.entity.Vo.DepartmentUpdateVo;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public interface DepartmentService extends IService<Department> {
    List<Department> queryDepartmentList(DepartmentSelectVo departmentSelectVo);
    int getLastCount();
    void departmentDelete(Department department);

    Department departmentFind(DepartmentUpdateVo departmentUpdateVo);

    void departmentUpdate(DepartmentUpdateVo departmentUpdateVo);

    void departmentAdd(DepartmentUpdateVo departmentUpdateVo);
}

最后便是controller类将后端数据传入前端

package com.example.system03.controller;

import com.example.system03.entity.Department;
import com.example.system03.entity.Vo.DepartmentSelectVo;
import com.example.system03.entity.Vo.DepartmentUpdateVo;
import com.example.system03.service.DepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.List;

@RestController
@RequestMapping("/data/departmentManagement/")
public class DepartmentController {
    @Autowired
    DepartmentService departmentService;

    @PostMapping("/departmentList")
    public Object queryRoleList(
            @RequestBody DepartmentSelectVo departmentSelectVo
    ) {
        HashMap<String, Object> res = new HashMap<>();
        List<Department> departmentList = departmentService.queryDepartmentList(departmentSelectVo);
        int departmentListCount = departmentService.getLastCount();
        res.put("departmentList", departmentList);
        res.put("total", departmentListCount);
        MyUtils.success(res);
        return res;
    }

    @PostMapping("/departmentDelete")
    public Object departmentDelete(
            @RequestBody List<Department> departmentList
    ) {
        HashMap<String, Object> res = new HashMap<>();
        for (Department department : departmentList) {
            departmentService.departmentDelete(department);
        }
        MyUtils.success(res);
        return res;
    }

    @PostMapping("/departmentUpdate")
    public Object departmentUpdate(
            @RequestBody DepartmentUpdateVo departmentUpdateVo
    ) {
        HashMap<String, Object> res = new HashMap<>();
        Department department = departmentService.departmentFind(departmentUpdateVo);
        if (departmentUpdateVo.getRequest().equals("update")) {
            if (department == null) {
                MyUtils.fail(res, "该部门不存在,无法更新");
            } else {
                departmentService.departmentUpdate(departmentUpdateVo);
                MyUtils.success(res);
            }
        } else if (departmentUpdateVo.getRequest().equals("insert")) {
            if (department != null) {
                MyUtils.fail(res, "该部门已经存在，请勿重复创建");
            } else {
                departmentService.departmentAdd(departmentUpdateVo);
                MyUtils.success(res);
            }
        }


        return res;
    }


}