锋哥原创的uniapp微信小程序投票系统实战：

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create table `t_vote_detail` (
	`id` int (11),
	`vote_id` int (11),
	`vote_item_id` int (11),
	`vote_date` datetime ,
	`openid` varchar (600)
); 

新建VoteDetail实体：

package com.java1234.entity;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import lombok.Data;

import java.util.Date;

/**投票详情
 * @author java1234_小锋 （公众号：java1234）
 * @site www.java1234.vip
 * @company 南通小锋网络科技有限公司
 */
@TableName("t_vote_detail")
@Data
public class VoteDetail {

    private Integer id; // 编号

    private Integer voteId; // 投票ID

    private Integer voteItemId; // 投票选项ID

    private String openid; // 投票人openid

    @TableField(select=false,exist = false)
    private WxUserInfo wxUserInfo;

    @JsonSerialize(using=CustomDateTimeSerializer.class)
    private Date voteDate;  // 投票时间

}

新建VoteDetailMapper

package com.java1234.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.java1234.entity.VoteDetail;

/**
 * 投票详情Mapper接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:00
 */
public interface VoteDetailMapper extends BaseMapper<VoteDetail>{


}

新建IVoteDetailService

package com.java1234.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.java1234.entity.VoteDetail;

/**
 * 投票详情Service接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:01
 */
public interface IVoteDetailService extends IService<VoteDetail> {
}

新建IVoteDetailServiceImpl

package com.java1234.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.java1234.entity.VoteDetail;
import com.java1234.mapper.VoteDetailMapper;
import com.java1234.service.IVoteDetailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 投票详情Service实现类
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:02
 */
@Service("voteDetailService")
public class IVoteDetailServiceImpl extends ServiceImpl<VoteDetailMapper, VoteDetail> implements IVoteDetailService {

    @Autowired
    private VoteDetailMapper voteDetailMapper;
}

新建VoteDetailController

package com.java1234.controller;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.java1234.entity.R;
import com.java1234.entity.VoteDetail;
import com.java1234.entity.VoteItem;
import com.java1234.service.IVoteDetailService;
import com.java1234.service.IVoteItemService;
import com.java1234.util.JwtUtils;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 投票详情Controller控制器
 * @author java1234_小锋 （公众号：java1234）
 * @site www.java1234.vip
 * @company 南通小锋网络科技有限公司
 */
@RestController
@RequestMapping("/voteDetail")
public class VoteDetailController {

    @Autowired
    private IVoteDetailService voteDetailService;

    @Autowired
    private IVoteItemService voteItemService;



    /**
     * 添加投票
     * @param voteDetail
     * @param token
     * @return
     */
    @RequestMapping("/add")
    @Transactional
    public R add(@RequestBody VoteDetail voteDetail, @RequestHeader String token){
        System.out.println("token="+token);
        Claims claims = JwtUtils.validateJWT(token).getClaims();
        System.out.println("openid="+claims.getId());
        String openid=claims.getId();
        int count = voteDetailService.count(new QueryWrapper<VoteDetail>().eq("openid", openid).eq("vote_id", voteDetail.getVoteId()));
        Map<String,Object> resultMap=new HashMap<>();
        if(count>0){
            resultMap.put("info","您已经投票过，不能重复投票！");
        }else {
            resultMap.put("info", "投票成功！");
            voteDetail.setOpenid(openid);
            voteDetail.setVoteDate(new Date());
            // 对指定投票项的number+1操作
            VoteItem voteItem=new VoteItem();
            voteItem.setId(voteDetail.getVoteItemId());

            voteItemService.update(new UpdateWrapper<VoteItem>().setSql("number=number+1").eq("id",voteDetail.getVoteItemId()));
            voteDetailService.save(voteDetail);
        }
        return R.ok(resultMap);
    }



}

前端投票提交：

submitVote:async function(e){
				let form={
					voteItemId:this.sItem,
					voteId:this.vote.id
				}
				const result=await requestUtil({url:"/voteDetail/add",data:form,method:"post"});
				if(result.code==0){
					uni.showToast({
						icon:"success",
						title:result.info
					})
				}
			}