基于Spring Boot、Vue和MyBatis的前后端分离座位管理系统：增删改查功能入门指南

   在项目开发和工作实践中，创作灵感往往来自于对日常经验的总结与反思。通过记录技术难点和解决方案，不仅可以加深对问题的理解，还能为后续项目的优化提供参考。与此同时，撰写技术笔记、分享职场心得，不仅是对自己成长的回顾，也是帮助他人学习与进步的过程。

总结几条创作灵感：
  记录工作中的实践经验，反思项目中的得失，逐步积累自己的知识库。
  通过笔记记录重要的技术知识点，不断丰富技术储备。
  发表职场心得与感悟，不仅是总结自我成长的过程，还能与同行交流分享。
  将原创文章搬运至各大平台，扩大影响力，促进与更多技术爱好者的互动。

详细的代码 sql  我放下面   需要完整的代码   vx：Java980320  免费分享  

系统用户页面展示

用户添加页面展示

编辑用户信息

SQL表DDL语句

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `username` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '用户名',
  `password` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '密码',
  `role` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '角色',
  `touxiang` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '头像',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='用户';

User实体

package com.example.entity;


/**
 * 用户
*/
public class User {
    /** ID */
    private Integer id;
    /** 用户名 */
    private String username;
    /** 密码 */
    private String password;
    /** 角色 */
    private String role;
    /** 头像 */
    private String touxiang;

    public Integer getId() {
        return id;
    }

    public void setId(Integer 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;
    }

    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role;
    }

    public String getTouxiang() {
        return touxiang;
    }

    public void setTouxiang(String touxiang) {
        this.touxiang = touxiang;
    }

}

UserController

package com.example.controller;

import com.example.common.Result;
import com.example.entity.User;
import com.example.service.UserService;
import com.github.pagehelper.PageInfo;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.List;

/**
 * 用户前端操作接口
 **/
@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    /**
     * 新增
     */
    @PostMapping("/add")
    public Result add(@RequestBody User user) {
        userService.add(user);
        return Result.success();
    }

    /**
     * 删除
     */
    @DeleteMapping("/delete/{id}")
    public Result deleteById(@PathVariable Integer id) {
        userService.deleteById(id);
        return Result.success();
    }

    /**
     * 批量删除
     */
    @DeleteMapping("/delete/batch")
    public Result deleteBatch(@RequestBody List<Integer> ids) {
        userService.deleteBatch(ids);
        return Result.success();
    }

    /**
     * 修改
     */
    @PutMapping("/update")
    public Result updateById(@RequestBody User user) {
        userService.updateById(user);
        return Result.success();
    }

    /**
     * 根据ID查询
     */
    @GetMapping("/selectById/{id}")
    public Result selectById(@PathVariable Integer id) {
        User user = userService.selectById(id);
        return Result.success(user);
    }

    /**
     * 查询所有
     */
    @GetMapping("/selectAll")
    public Result selectAll(User user) {
        List<User> list = userService.selectAll(user);
        return Result.success(list);
    }

    /**
     * 分页查询
     */
    @GetMapping("/selectPage")
    public Result selectPage(User user,
                             @RequestParam(defaultValue = "1") Integer pageNum,
                             @RequestParam(defaultValue = "10") Integer pageSize) {
        PageInfo<User> page = userService.selectPage(user, pageNum, pageSize);
        return Result.success(page);
    }

}

UserService

package com.example.service;

import com.example.entity.User;
import com.example.mapper.UserMapper;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import java.util.List;

/**
 * 用户业务处理
 **/
@Service
public class UserService {

    @Resource
    private UserMapper userMapper;

    /**
     * 新增
     */
    public void add(User user) {
        userMapper.insert(user);
    }

    /**
     * 删除
     */
    public void deleteById(Integer id) {
        userMapper.deleteById(id);
    }

    /**
     * 批量删除
     */
    public void deleteBatch(List<Integer> ids) {
        for (Integer id : ids) {
            userMapper.deleteById(id);
        }
    }

    /**
     * 修改
     */
    public void updateById(User user) {
        userMapper.updateById(user);
    }

    /**
     * 根据ID查询
     */
    public User selectById(Integer id) {
        return userMapper.selectById(id);
    }

    /**
     * 查询所有
     */
    public List<User> selectAll(User user) {
        return userMapper.selectAll(user);
    }

    /**
     * 分页查询
     */
    public PageInfo<User> selectPage(User user, Integer pageNum, Integer pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<User> list = userMapper.selectAll(user);
        return PageInfo.of(list);
    }

}

UserMapper

package com.example.mapper;

import com.example.entity.User;
import java.util.List;

/**
 * 操作user相关数据接口
*/
public interface UserMapper {

    /**
      * 新增
    */
    int insert(User user);

    /**
      * 删除
    */
    int deleteById(Integer id);

    /**
      * 修改
    */
    int updateById(User user);

    /**
      * 根据ID查询
    */
    User selectById(Integer id);

    /**
      * 查询所有
    */
    List<User> selectAll(User user);

}

UserMapper.xml

<?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.mapper.UserMapper">

    <sql id="Base_Column_List">
        id,username,password,role,touxiang
    </sql>

    <select id="selectAll" resultType="com.example.entity.User">
        select
        <include refid="Base_Column_List" />
        from user
        <where>
            <if test="id != null"> and id = #{id}</if>
            <if test="username != null"> and username like concat('%', #{username}, '%')</if>
            <if test="password != null"> and password like concat('%', #{password}, '%')</if>
            <if test="role != null"> and role like concat('%', #{role}, '%')</if>
            <if test="touxiang != null"> and touxiang like concat('%', #{touxiang}, '%')</if>
        </where>
        order by id desc
    </select>

    <select id="selectById" resultType="com.example.entity.User">
        select
        <include refid="Base_Column_List" />
        from user
        where id = #{id}
    </select>

    <delete id="deleteById">
        delete from user
        where  id = #{id}
    </delete>

    <insert id="insert" parameterType="com.example.entity.User" useGeneratedKeys="true" keyProperty="id">
        insert into user
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="username != null">username,</if>
            <if test="password != null">password,</if>
            <if test="role != null">role,</if>
            <if test="touxiang != null">touxiang,</if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="username != null">#{username},</if>
            <if test="password != null">#{password},</if>
            <if test="role != null">#{role},</if>
            <if test="touxiang != null">#{touxiang},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.User">
        update user
        <set>
            <if test="username != null">
                username = #{username},
            </if>
            <if test="password != null">
                password = #{password},
            </if>
            <if test="role != null">
                role = #{role},
            </if>
            <if test="touxiang != null">
                touxiang = #{touxiang},
            </if>
        </set>
        where id = #{id} 
    </update>

</mapper>

User.vue

<template>
  <div>
    <div class="search">
      <el-input placeholder="请输入关键字查询" style="width: 200px" v-model="name"></el-input>
      <el-button type="info" plain style="margin-left: 10px" @click="load(1)">查询</el-button>
      <el-button type="warning" plain style="margin-left: 10px" @click="reset">重置</el-button>
    </div>

    <div class="operation">
      <el-button type="primary" plain @click="handleAdd">新增</el-button>
      <el-button type="danger" plain @click="delBatch">批量删除</el-button>
    </div>

    <div class="table">
      <el-table :data="tableData" strip @selection-change="handleSelectionChange">
        <el-table-column type="selection" width="55" align="center"></el-table-column>
        <el-table-column prop="id" label="序号" width="70" align="center" sortable></el-table-column>
        <el-table-column prop="username" label="用户名"></el-table-column>
        <el-table-column prop="password" label="密码"></el-table-column>
        <el-table-column prop="role" label="角色"></el-table-column>
        <el-table-column prop="touxiang" label="头像"></el-table-column>
        <el-table-column label="操作" align="center" width="180">
          <template v-slot="scope">
            <el-button size="mini" type="primary" plain @click="handleEdit(scope.row)">编辑</el-button>
            <el-button size="mini" type="danger" plain @click="del(scope.row.id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>

      <div class="pagination">
        <el-pagination
            background
            @current-change="handleCurrentChange"
            :current-page="pageNum"
            :page-sizes="[5, 10, 20]"
            :page-size="pageSize"
            layout="total, prev, pager, next"
            :total="total">
        </el-pagination>
      </div>
    </div>

    <el-dialog title="用户" :visible.sync="fromVisible" width="40%" :close-on-click-modal="false" destroy-on-close>
      <el-form :model="form" label-width="100px" style="padding-right: 50px" :rules="rules" ref="formRef">
        <el-form-item label="用户名" prop="username">
          <el-input v-model="form.username" placeholder="用户名"></el-input>
        </el-form-item>
        <el-form-item label="密码" prop="password">
          <el-input v-model="form.password" placeholder="密码"></el-input>
        </el-form-item>
        <el-form-item label="角色" prop="role">
          <el-input v-model="form.role" placeholder="角色"></el-input>
        </el-form-item>
        <el-form-item label="头像" prop="touxiang">
          <el-input v-model="form.touxiang" placeholder="头像"></el-input>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="fromVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>


  </div>
</template>
<script>
export default {
  name: "User",
  data() {
    return {
      tableData: [],  // 所有的数据
      pageNum: 1,   // 当前的页码
      pageSize: 10,  // 每页显示的个数
      total: 0,
      name: null,
      fromVisible: false,
      form: {},
      user: JSON.parse(localStorage.getItem('xm-user') || '{}'),
      rules: {
      },
      ids: []
    }
  },
  created() {
    this.load(1)
  },
  methods: {
    handleAdd() {   // 新增数据
      this.form = {}  // 新增数据的时候清空数据
      this.fromVisible = true   // 打开弹窗
    },
    handleEdit(row) {   // 编辑数据
      this.form = JSON.parse(JSON.stringify(row))  // 给form对象赋值  注意要深拷贝数据
      this.fromVisible = true   // 打开弹窗
    },
    save() {   // 保存按钮触发的逻辑  它会触发新增或者更新
      this.$refs.formRef.validate((valid) => {
        if (valid) {
          this.$request({
            url: this.form.id ? '/user/update' : '/user/add',
            method: this.form.id ? 'PUT' : 'POST',
            data: this.form
          }).then(res => {
            if (res.code === '200') {  // 表示成功保存
              this.$message.success('保存成功')
              this.load(1)
              this.fromVisible = false
            } else {
              this.$message.error(res.msg)  // 弹出错误的信息
            }
          })
        }
      })
    },
    del(id) {   // 单个删除
      this.$confirm('您确定删除吗？', '确认删除', {type: "warning"}).then(response => {
        this.$request.delete('/user/delete/' + id).then(res => {
          if (res.code === '200') {   // 表示操作成功
            this.$message.success('操作成功')
            this.load(1)
          } else {
            this.$message.error(res.msg)  // 弹出错误的信息
          }
        })
      }).catch(() => {
      })
    },
    handleSelectionChange(rows) {   // 当前选中的所有的行数据
      this.ids = rows.map(v => v.id)
    },
    delBatch() {   // 批量删除
      if (!this.ids.length) {
        this.$message.warning('请选择数据')
        return
      }
      this.$confirm('您确定批量删除这些数据吗？', '确认删除', {type: "warning"}).then(response => {
        this.$request.delete('/user/delete/batch', {data: this.ids}).then(res => {
          if (res.code === '200') {   // 表示操作成功
            this.$message.success('操作成功')
            this.load(1)
          } else {
            this.$message.error(res.msg)  // 弹出错误的信息
          }
        })
      }).catch(() => {
      })
    },
    load(pageNum) {  // 分页查询
      if (pageNum) this.pageNum = pageNum
      this.$request.get('/user/selectPage', {
        params: {
          pageNum: this.pageNum,
          pageSize: this.pageSize,
          name: this.name,
        }
      }).then(res => {
        if (res.code === '200') {
          this.tableData = res.data?.list
          this.total = res.data?.total
        } else {
          this.$message.error(res.msg)
        }
      })
    },
    reset() {
      this.name = null
      this.load(1)
    },
    handleCurrentChange(pageNum) {
      this.load(pageNum)
    },
  }
}
</script>

<style scoped>

</style>