基于微信小程序的竞赛答题小程序开发笔记（一）

开发背景调研

中小学学科答题小程序，适合各中小学校方，老师或者家长。通过互动和参与式学习，小程序能够通过游戏化元素提升学习的积极性和参与度，从而提升学习效率，促进学生自主学习

功能规划

分类题库：按照学科（数学、语文、英语等）和知识点进行分类，方便用户选择。
随机抽题：用户可以选择特定学科，系统随机生成题目。
答题竞赛：模拟真实竞赛或考试环境，可以设置每场的时间。
解析详解：每道题目提供详细的解答和解析，帮助用户理解解题思路。
排行榜：展示用户的积分排名，促进比赛竞争。
后台-题库管理：支持直接录入，或者通过Excel导入题库（每次5000条)
后台-答题参数设置：可以设置竞赛开始状态，每次答题数目，每次答题时长限制，每天可参与答题竞赛次数等参数

概要设计

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数据库设计

AnswerModel.DB_STRUCTURE = {_pid: 'string|true',ANSWER_ID: 'string|true',ANSWER_USER_ID: 'string|true',ANSWER_TYPE: 'int|true|default=0|comment=类型 0=测试,1=正式',ANSWER_CATE_ID: 'string|true|default=0|comment=分类',ANSWER_CATE_NAME: 'string|false|comment=分类冗余', ANSWER_DAY: 'string|true',ANSWER_START: 'int|true|default=0',ANSWER_END: 'int|true|default=0',ANSWER_DURATION: 'string|false',ANSWER_PER: 'int|true|default=0',ANSWER_SCORE: 'int|true|default=0',ANSWER_CNT: 'int|true|default=0',ANSWER_SUCC_CNT: 'int|true|default=0',ANSWER_LIST: 'array|true|default=[]',ANSWER_ADD_TIME: 'int|true',ANSWER_EDIT_TIME: 'int|true',ANSWER_ADD_IP: 'string|false',ANSWER_EDIT_IP: 'string|false',
};QuestionModel.DB_STRUCTURE = {_pid: 'string|true',QUESTION_ID: 'string|true',QUESTION_TITLE: 'string|true|comment=题目',QUESTION_STATUS: 'int|true|default=1|comment=状态 0=未启用,1=使用中',QUESTION_CATE_ID: 'string|true|default=0|comment=分类',QUESTION_CATE_NAME: 'string|false|comment=分类冗余', QUESTION_ORDER: 'int|true|default=9999',QUESTION_FORMS: 'array|true|default=[]',QUESTION_OBJ: 'object|true|default={}', QUESTION_ADD_TIME: 'int|true',QUESTION_EDIT_TIME: 'int|true',QUESTION_ADD_IP: 'string|false',QUESTION_EDIT_IP: 'string|false',
};

难点与实现

class QuestionService extends BaseProjectService {async getAnswerDetail(id) {return await AnswerModel.getOne(id);}async delAnswer(userId, id) {return await AnswerModel.del({ ANSWER_USER_ID: userId, _id: id });}// 得分统计async statAnswer(userId) { let where = {ANSWER_USER_ID: userId,ANSWER_TYPE: 1}let cnt = await AnswerModel.count(where);let score = await AnswerModel.sum(where, 'ANSWER_SCORE');let data = {USER_ANSWER_CNT: cnt,USER_ANSWER_SCORE: score}await UserModel.edit({ USER_MINI_OPENID: userId }, data);}// 每日可答题次数校验async isAnswerTimes(userId, cateId) {let dayCnt = 100;let setup = await setupUtil.get('answer');if (setup) {setup = dataUtil.dbForms2Obj(setup);dayCnt = Number(setup.daycnt);if (setup.open != true) {return '竞赛尚未开始!';}}let where = {ANSWER_CATE_ID: String(cateId),ANSWER_USER_ID: userId,ANSWER_TYPE: 1,ANSWER_DAY: timeUtil.time('Y-M-D')}let cnt = await AnswerModel.count(where);if (cnt >= dayCnt) {return '每日竞赛答题最多' + dayCnt + '次，请明日再来！';}return '';}async saveMyAnswer(userId,) { }// 随机N条记录，生成本次题库async genQuestion(userId, type, cateId) { return { questionList: [], maxTime:10 };}async getMyAnswerList(userId, {search, // 搜索条件sortType, // 搜索菜单sortVal, // 搜索菜单orderBy, // 排序 page,size,isTotal = true,oldTotal}) {orderBy = orderBy || {'ANSWER_ADD_TIME': 'desc'};let fields = 'ANSWER_SCORE,ANSWER_CATE_NAME,ANSWER_TYPE,ANSWER_ADD_TIME,ANSWER_CNT,ANSWER_PER,ANSWER_SUCC_CNT,ANSWER_DURATION,ANSWER_START,ANSWER_END';let where = {};where.and = {ANSWER_USER_ID: userId,_pid: this.getProjectId() //复杂的查询在此处标注PID};if (util.isDefined(search) && search) {where.or = [];} else if (sortType && util.isDefined(sortVal)) {// 搜索菜单switch (sortType) {case 'type': {where.and.ANSWER_TYPE = Number(sortVal);break;}case 'cateId': {where.and.ANSWER_CATE_ID = String(sortVal);break;}case 'sort': {orderBy = this.fmtOrderBySort(sortVal, 'ANSWER_ADD_TIME');break;}}}return await AnswerModel.getList(where, fields, orderBy, page, size, isTotal, oldTotal);}async getScoreRankList({search, // 搜索条件sortType, // 搜索菜单sortVal, // 搜索菜单orderBy, // 排序 page,size,isTotal = true,oldTotal}) {orderBy = {'USER_ANSWER_SCORE': 'desc'};let fields = 'USER_NAME,USER_ANSWER_SCORE';let where = {};where.and = {_pid: this.getProjectId() //复杂的查询在此处标注PID};if (util.isDefined(search) && search) {where.or = [];} else if (sortType && util.isDefined(sortVal)) {// 搜索菜单switch (sortType) {case 'sort': {orderBy = this.fmtOrderBySort(sortVal, 'ANSWER_ADD_TIME');break;}}}return await UserModel.getList(where, fields, orderBy, page, size, isTotal, oldTotal);}}