1. 开发商家管理功能（后端）

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先导入takeaway.sql

takeaway.sql

sql表 business

CREATE TABLE `business`  (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '序号',
  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '账号',
  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '密码',
  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '名称',
  `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT 'logo',
  `role` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '角色',
  `phone` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '电话',
  `info` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '简介',
  `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '地址',
  `license` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '营业执照',
  `status` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT '待审核' COMMENT '审核状态',
  `time_range` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '营业时间',
  `type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '类型',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 10 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '商家表' ROW_FORMAT = Dynamic;

配置项目

启动成功

怎么访问数据接口？

  1. 拿到token
  2. 通过token去访问接口数据

注意：

mybatis插件

mybatis开启驼峰配置

注意接口请求数据的格式，下划线转驼峰

更新数据

增删改查规范

Business.java 实体类 BusinessController.java Http接口层

  • add
  • deleteById
  • deleteBatch
  • updateById
  • selectById
  • selectAll
  • selectPage

BusinessService.java 业务层 - add - deleteById - deleteBatch - updateById - selectById - selectAll - selectPage

BusinessMapper.java 数据接口层 - insert - deleteById - updateById - selectAll

BusinessMapper.xml 数据访问sql语句 新增

<insert id="insert" parameterType="com.example.entity.Business" useGeneratedKeys="true">
    insert into business
    <trim prefix="(" suffix=")" suffixOverrides=",">
    <if test="id != null">id,</if>
    ...
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
        <if test="id != null">#{id},</if>
    </trim>
</insert>

更新

<update id="updateById" parameterType="com.example.entity.Business">
    update business
    <set>
        <if test="username != null">
            username = #{username},
        </if>
      ...
     where id = #{id}
</update>

查询

<select id="selectAll" parameterType="com.example.entity.Business" resultType="com.example.entity.Business">
  select * from business
    <where>
      <if test="id != null">
          and id = #{id}
      </if>
    </where>
  order by id desc
</select>

mapper.xml的基本结构：

<?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.BusinessMapper">

</mapper>

详细代码

Business.java

package com.example.entity;

/**
 * 商家
 */
public class Business {

    /**
     * 主键
     */
    private Integer id;
    /**
     * 用户名
     */
    private String username;
    private String password;
    private String name;
    private String avatar;
    private String role;
    private String phone;
    private String info;
    private String address;
    private String license;
    private String status;
    private String timeRange;
    private String type;

    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 getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAvatar() {
        return avatar;
    }

    public void setAvatar(String avatar) {
        this.avatar = avatar;
    }

    public String getRole() {
        return role;
    }

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

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getLicense() {
        return license;
    }

    public void setLicense(String license) {
        this.license = license;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getTimeRange() {
        return timeRange;
    }

    public void setTimeRange(String timeRange) {
        this.timeRange = timeRange;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }
}

BusinessController.java

package com.example.controller;

import cn.hutool.core.util.ObjectUtil;
import com.example.common.Result;
import com.example.common.enums.ResultCodeEnum;
import com.example.entity.Business;
import com.example.service.BusinessService;
import com.github.pagehelper.PageInfo;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

/**
 * 商家管理相关接口
 */
@RestController
@RequestMapping("/business")
public class BusinessController {

    @Resource
    private BusinessService businessService;

    /**
     * 新增商家
     */
    @PostMapping("/add")
    public Result add(@RequestBody Business business) {
        // 数据校验
        if (ObjectUtil.isEmpty(business.getUsername()) || ObjectUtil.isEmpty(business.getPassword())) {
            return Result.error(ResultCodeEnum.PARAM_LOST_ERROR);
        }
        businessService.add(business);
        return Result.success();
    }

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

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

    /**
     * 修改商家
     */
    @PutMapping("/update")
    public Result update(@RequestBody Business business) {
        businessService.updateById(business);
        return Result.success();
    }

    /**
     * 查询所有商家
     */
    @GetMapping("/selectAll")
    public Result selectAll(Business business) {
        List<Business> list = businessService.selectAll(business);
        return Result.success(list);
    }

    /**
     * 查询单个商家
     */
    @GetMapping("/selectById/{id}")
    public Result selectAll(@PathVariable Integer id) {
        Business business = businessService.selectById(id);
        return Result.success(business);
    }

    /**
     * 分页条件查询
     */
    @GetMapping("/selectPage")
    public Result selectPage(Business business,
                             @RequestParam(defaultValue = "1") Integer pageNum,
                             @RequestParam(defaultValue = "10") Integer pageSize) {
        PageInfo<Business> pageInfo = businessService.selectPage(business, pageNum, pageSize);
        return Result.success(pageInfo);
    }

}

BusinessService.java

package com.example.service;

import cn.hutool.core.util.ObjectUtil;
import com.example.common.enums.ResultCodeEnum;
import com.example.common.enums.RoleEnum;
import com.example.entity.Business;
import com.example.exception.CustomException;
import com.example.mapper.BusinessMapper;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.Objects;

/**
 * 商家相关的业务方法
 */
@Service
public class BusinessService {

    @Resource
    private BusinessMapper businessMapper;

    /**
     * 新增商家
     */
    public void add(Business business) {
        Business dbBusiness = this.selectByUsername(business.getUsername());
        // 如果根据新增数据的账号查询查到了数据  那么这个数据不允许插入，因为账号不能重复
        if (ObjectUtil.isNotEmpty(dbBusiness)) {
            throw new CustomException(ResultCodeEnum.USER_EXIST_ERROR);
        }
        business.setRole(RoleEnum.BUSINESS.name());
        businessMapper.insert(business);
    }

    /**
     * 单个删除
     */
    public void deleteById(Integer id) {
        businessMapper.deleteById(id);
    }

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

    /**
     * 修改商家
     */
    public void updateById(Business business) {
        // 先根据id查询商家是否存在，商家不存在那就返回错误信息
        Business dbBusiness1 = selectById(business.getId());
        if (ObjectUtil.isEmpty(dbBusiness1)) {
            throw new CustomException(ResultCodeEnum.USER_NOT_EXIST_ERROR);
        }
        Business dbBusiness2 = this.selectByUsername(business.getUsername());
        //  根据当前更新的商家的账号查询数据库  如果数据库存在跟当前更新商家一样账号的数据  那么当前的更新是不合法的  数据重复了
        if (ObjectUtil.isNotEmpty(dbBusiness2) && !Objects.equals(dbBusiness2.getId(), business.getId())) {
            throw new CustomException(ResultCodeEnum.USER_EXIST_ERROR);
        }
        businessMapper.updateById(business);
    }

    /**
     * 查询所有
     */
    public List<Business> selectAll(Business business) {
        return businessMapper.selectAll(business);
    }

    /**
     * 根据账号查询
     */
    public Business selectByUsername(String username) {
        Business params = new Business();
        params.setUsername(username);
        List<Business> list = this.selectAll(params);
        return list.size() == 0 ? null : list.get(0);
    }

    /**
     * 根据ID查询
     */
    public Business selectById(Integer id) {
        Business params = new Business();
        params.setId(id);
        List<Business> list = this.selectAll(params);
        return list.size() == 0 ? null : list.get(0);
    }

    /**
     * 分页条件查询
     */
    public PageInfo<Business> selectPage(Business business, Integer pageNum, Integer pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<Business> list = businessMapper.selectAll(business);
        return PageInfo.of(list);
    }

}

BusinessMapper.java

package com.example.mapper;

import com.example.entity.Business;

import java.util.List;

/**
 * 商家相关的数据访问接口
 */
public interface BusinessMapper {

    List<Business> selectAll(Business business);

    int insert(Business business);

    int updateById(Business business);

    int deleteById(Integer id);

}

BusinessMapper.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.BusinessMapper">

    <insert id="insert" parameterType="com.example.entity.Business" useGeneratedKeys="true">
        insert into business
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="username != null">username,</if>
            <if test="password != null">password,</if>
            <if test="name != null">name,</if>
            <if test="avatar != null">avatar,</if>
            <if test="role != null">role,</if>
            <if test="phone != null">phone,</if>
            <if test="info != null">info,</if>
            <if test="address != null">address,</if>
            <if test="license != null">license,</if>
            <if test="status != null">status,</if>
            <if test="timeRange != null">time_range,</if>
            <if test="type != null">type,</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="name != null">#{name},</if>
            <if test="avatar != null">#{avatar},</if>
            <if test="role != null">#{role},</if>
            <if test="info != null">#{info},</if>
            <if test="address != null">#{address},</if>
            <if test="license != null">#{license},</if>
            <if test="status != null">#{status</if>
            <if test="timeRange != null">#{timeRange},</if>
            <if test="type != null">#{type},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.Business">
        update business
        <set>
            <if test="username != null">
                username = #{username},
            </if>
            <if test="password != null">
                password = #{password},
            </if>
            <if test="name != null">
                name = #{name},
            </if>
            <if test="avatar != null">
                avatar = #{avatar},
            </if>
            <if test="role != null">
                role = #{role},
            </if>
            <if test="phone != null">
                phone = #{phone},
            </if>
            <if test="info != null">
                info = #{info},
            </if>
            <if test="address != null">
                address = #{address},
            </if>
            <if test="license != null">
                license = #{license},
            </if>
            <if test="status != null">
                status = #{status},
            </if>
            <if test="timeRange != null">
                time_range = #{timeRange},
            </if>
            <if test="type != null">
                type = #{type},
            </if>
        </set>
        where id = #{id}
    </update>

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

    <select id="selectAll" parameterType="com.example.entity.Business" resultType="com.example.entity.Business">
        select * from business
        <where>
            <if test="id != null">
                and id = #{id}
            </if>
            <if test="username != null">
                and username = #{username}
            </if>
            <if test="name != null">
                and name like concat('%', #{name}, '%')
            </if>
        </where>
        order by id desc
    </select>

</mapper>