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注意,前情提示:
本代码基于《Node.js(nodejs)对本地JSON文件进行增、删、改、查操作(轻车熟路)》 传送门
在/api/demo/文件夹下面创建CURD.base.js
代码内容
const $g = global.SG.$g, fs = global.SG.fs, router = global.SG.router;module.exports = global.SG.router;//经常需要修改的内容----------------------------------------------------------------const demoJsonPath = "json/demo/test.json";//测试存储数据的json文件路径const apiPath = "/demo/CURD.base";//定义前端请求的接口路径//----------------------------------------------------------------const mkdirs = $g.dir.mkdirsByFilePath;//递归创建文件夹目录(基于文件路径)/**【增】方法➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕➕*/const __C = (_curd) => { _curd._doText = "添加"; let jsonPath = _curd.jsonPath, body = _curd.body, success = _response.success, fail = _response.fail; body = Object.assign({id: $g.date.timestamp()}, body);//自动添加时间戳为id fs.readFile(jsonPath, (err, data) => { if (err) return fail && fail({code: -1, msg: "读取数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----添加失败----"); data = JSON.parse(data.toString()); data.push(body); fs.writeFile(jsonPath, JSON.stringify(data), err => { if (err) return fail && fail({code: -1, msg: "写入数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----添加失败----"); success && success({change: body, data}, _curd);//回显发生改变的内容用于关联表处理的前端业务,_curd._doText逻辑 console.log($g.date.nowtime() + "\n", data, "\n----添加成功----"); }); });};/**【删】方法✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖*/const __D = (_curd) => { _curd._doText = "删除"; const jsonPath = _curd.jsonPath, body = _curd.body, success = _response.success, fail = _response.fail; const ids = Array.isArray(body.id) ? body.id : [body.id.toString()]; //批量删除功能 fs.readFile(jsonPath, (err, data) => { if (err) return fail && fail({code: -1, msg: "读取数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----删除失败----"); data = JSON.parse(data.toString()); let arr = data, re = [], successIds = [], changes = []; for (let i = 0, len = arr.length; i < len; i++) { let a = arr[i]; ids.includes((a.id || "null").toString()) ? (successIds.push(a.id), changes.push(a)) : re.push(a); } if (!successIds.length) return fail && fail({code: -1, msg: `没有找到对应id:${ids}的记录,删除失败`, data}, _curd), console.error($g.date.nowtime(), "\n----删除失败----"); fs.writeFile(jsonPath, JSON.stringify(re), err => { if (err) return fail && fail({code: -1, msg: "写入数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----删除失败----"); success && success({change: changes, data: re}, _curd);//回显发生改变的内容用于关联表处理的前端业务,_curd._doText逻辑 console.log($g.date.nowtime() + "\n", re, `\n----id:${successIds}删除成功----`); }); });};/**【改】方法🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧🔧*/const __U = (_curd) => { _curd._doText = "修改"; const jsonPath = _curd.jsonPath, body = _curd.body, success = _response.success, fail = _response.fail, id = body.id; delete body.id; fs.readFile(jsonPath, (err, data) => { if (err) return fail && fail({code: -1, msg: "读取数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----修改失败----"); data = JSON.parse(data.toString()); let change = null, arr = data; for (let i = 0, len = arr.length; i < len; i++) { let a = arr[i]; if (a.id === id) { for (let key in body) a[key] = body[key]; change = a; break; } } if (!change) return fail && fail({code: -1, msg: `没有找到对应${id}的记录,修改失败`, data}, _curd), console.error($g.date.nowtime(), "\n----修改失败----"); fs.writeFile(jsonPath, JSON.stringify(data), err => { if (err) return fail && fail({code: -1, msg: "写入数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----修改失败----"); success && success({change, data}, _curd);//回显发生改变的内容用于关联表处理的前端业务,_curd._doText逻辑 console.log($g.date.nowtime() + "\n", data, `\n----id:${id}修改成功----`); }); });};/**【查】方法🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍🔍*/const __isMatch = (record, obj) => { let countDefault = 0, countMatch = 0; for (let key in obj) { countDefault++; record[key] == obj[key] && (countMatch++); } return countDefault === countMatch;};const __R = (_curd) => { _curd._doText = "查询"; const maxPageSize = 999999999; const jsonPath = _curd.jsonPath, body = _curd.body, success = _response.success, fail = _response.fail; let pageNum = parseInt(body.pageNum || 0);//默认从第1页开始 pageNum < 0 && (pageNum = 0); let pageSize = parseInt(body.pageSize || maxPageSize);//不传参就显示所有数据 pageSize < 0 && (pageSize = maxPageSize); delete body.pageNum; delete body.pageSize; fs.readFile(jsonPath, (err, data) => { if (err) return fail && fail({code: -1, msg: "读取数据失败", data: err}, _curd), console.error($g.date.nowtime() + "\n", err, "\n----查询失败----"); data = JSON.parse(data.toString()); let re = []; CURD.js; let arr = data; for (let i = 0, len = arr.length; i < len; i++) { let a = arr[i]; __isMatch(a, body) && re.push(a); } re = re.slice(pageNum * pageSize, pageSize ? (pageNum + 1) * pageSize : re.length); success && success({data: re, total: arr.length, pageNum: pageNum, pageSize: pageSize}, _curd); console.log($g.date.nowtime() + "\n", re, "\n----查询成功----"); });};/**【响应体】方法◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆*/const _response = { success: (data, _curd) => $g.json.res(_curd.req, _curd.res, _curd._doText + "成功", data, true), fail: (err, _curd) => $g.json.res(_curd.req, _curd.res, err.msg, err.data, false)};/**【增删改查】方法◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆*/const CURD = (_curd) => { //【增】❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ if ($g.CURD.hasAndNoHasFields(_curd.body, [], ["id", "pageNum", "pageSize"])) return __C(_curd); //【删】❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ if ($g.CURD.hasAndNoHasFields(_curd.body, ["id"])) return __D(_curd); //【改】❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ if ($g.CURD.hasAndNoHasFields(_curd.body, ["id"], ["pageNum", "pageSize"]) && $g.CURD.hasExceptFields(_curd.body, ["id", "pageNum", "pageSize"])) return __U(_curd); //【查】❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ return __R(_curd);};/**增删改查数据(all方法支持POST、GET、PUT、PATCH、DELETE传参方式)◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆*/router.all(apiPath, (req, res) => { let body = JSON.parse(JSON.stringify(req.body)); let jsonPath = body.jsonPath;//指定存储数据的json文件路径(路径自动添加,如果没有该文件,系统会自动创建此json,业务重心转嫁到前端) jsonPath && delete body.jsonPath; jsonPath || (jsonPath = demoJsonPath); jsonPath.includes("/") || (jsonPath = "json/" + jsonPath); //判断给定的路径是否存在 fs.exists(jsonPath, exists => { if (exists) { CURD({req, res, jsonPath, body}); } else { mkdirs(jsonPath, () => fs.writeFile(jsonPath, "[]", err => { console.log(`${$g.date.nowtime()}创建${jsonPath}${err ? "失败" : "成功"}`); CURD({req, res, jsonPath, body}); })); } });});
在index.js最后一行加入
app.use(API_PATH, require(`.${API_PATH}/demo/CURD.base`));//增删改查数据(基础版、免登陆、无鉴权)
运行
node index
注意:在接口当中如果使用全局变量,尽量是常量const,不要将频繁修改的公共变量放在全局作用域,多个客户端在同时访问接口的时候会共用全局作用域中的变量,容易引起变量值冲突!!!
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