辽宁网站建设多少钱,中文wordpress网站模板下载,做网站的语言叫什么,wordpress模板函数一、在 Nodejs 中使用 Mongodb 在前面的博文我们给大家讲了如何使用命令操作 Mongodb#xff0c;这篇博文开始我们给大家讲解一 下如何使用 Nodejs 来操作 Mongodb 数据库 Nodejs 操作 mongodb 数据库官方文档#xff1a;https://www.mongodb.org.cn/drivers/5.html npm i…一、在 Nodejs 中使用 Mongodb 在前面的博文我们给大家讲了如何使用命令操作 Mongodb这篇博文开始我们给大家讲解一 下如何使用 Nodejs 来操作 Mongodb 数据库 Nodejs 操作 mongodb 数据库官方文档https://www.mongodb.org.cn/drivers/5.html npm install mongodb --save 或者 cnpm install mongodb --save 或者 yarn add mongodb二、Nodejs 连接 MongoDb 数据库 const MongoClient require(mongodb).MongoClient; const url mongodb://localhost:27017; // const url mongodb://admin:123456localhost:27017/; 有密码连接方式 const dbName itying; const client new MongoClient(url,{ useUnifiedTopology: true }); client.connect(function(err) { if(err){console.log(err); return; }console.log(连接成功); //获取 db 对象 const db client.db(dbName); });注意如果数据库开启了权限验证的话需要使用下面方式连接数据库 其中admin 表示用户名123456 表示密码 const url mongodb://admin:123456localhost:27017/;三、Nodejs 查找 MongoDb 数据库的数据 const MongoClient require(mongodb).MongoClient; const url mongodb://localhost:27017; const dbName itying; const client new MongoClient(url,{ useUnifiedTopology: true }); client.connect(function(err) { if(err){console.log(err); return; }const db client.db(dbName); //获取 db 对象 db.collection(user).find({}).toArray(function(err,data){ //查找 if(err){console.log(err); return; }console.log(data); client.close(); }) });四、Nodejs 给 MongoDb 增加数据 const MongoClient require(mongodb).MongoClient; const url mongodb://localhost:27017; const dbName itying; const client new MongoClient(url,{ useUnifiedTopology: true }); client.connect(function(err) { if(err){console.log(err); return; }//获取 db 对象 const db client.db(dbName); //新增数据 db.collection(user).insertOne({username:nodejs,age:10},(err,result){ if(err){console.log(err); return; }console.log(result); client.close(); }) });五、Nodejs 修改 MongoDb 数据 const MongoClient require(mongodb).MongoClient; const url mongodb://localhost:27017; // const url mongodb://admin:123456localhost:27017/; 有密码连接方式 const dbName itying; const client new MongoClient(url,{ useUnifiedTopology: true }); client.connect(function(err) { if(err){console.log(err); return; }const db client.db(dbName); //获取 db 对象 db.collection(user).updateOne({name:zhangsan},{$set:{age:50}},(err,result){ if(err){console.log(err); return; }console.log(result); client.close(); })});六、Nodejs 删除 MongoDb 数据 const {MongoClient,ObjectID} require(mongodb); const url mongodb://localhost:27017; const dbName itying; const client new MongoClient(url,{ useUnifiedTopology: true }); client.connect(function(err) { if(err){console.log(err); return; }//获取 db 对象 const db client.db(dbName); //删除数据 db.collection(user).deleteOne({ username : nodejs }, function(err, result) { if(err){ console.log(err); return; }console.log(result); client.close(); }); });七、完整代码 /* 1.引入mongodb */ // const MongoClient require(mongodb).MongoClient; const { MongoClient } require(mongodb);/* 2.定义数据库连接的地址 */ const url mongodb://admin:admin127.0.0.1:27017;/* 3.定义要操作的数据库 */ const dbName itying;/* 4.实例化MongoClient 传入数据库连接地址 */ const client new MongoClient(url, { useUnifiedTopology: true });/* 5.连接数据库 */ client.connect((err) {if (err) {console.log(数据库连接失败);return;}console.log(数据库连接成功);let db client.db(dbName);/* // 查找数据db.collection(user).find({ age: 20 }).toArray((err, data) {if (err) {console.log(err);return;}console.log(data);client.close();}) *//* // 增加数据db.collection(user).insertOne({ name: nodejs, age: 10 }, (err, result) {if (err) {console.log(err);return;}console.log(增加成功);console.log(result);// 6.操作数据库完毕以后一定要关闭数据库连接client.close();}) */// 修改数据/* db.collection(user).updateOne({name: xiaoli}, {$set:{age: 100}}, (err, data) {if (err) {console.log(err);return;}console.log(修改成功);console.log(data);client.close();})*//* // 删除一条数据db.collection(user).deleteOne({name: nodejs}, (err){if (err) {console.log(err);return;}console.log(删除一条数据成功);client.close();}) */// 删除多条数据db.collection(user).deleteMany({name: nodejs}, (err){if (err) {console.log(err);return;}console.log(删除多条数据成功);client.close();})}) 八、实战案例 浏览器发送get请求 访问 /register渲染出注册页面 浏览器发送post请求访问 /doRegister, 后端获取前端提交的表单数据然后将数据存入mongodb数据库中 浏览器发送get请求 访问 / 从mongodb数据库查询数据并渲染到前端页面上 app.js: const http require(http); const querystring require(querystring) const app require(./module/routes); const ejs require(ejs); const { MongoClient } require(mongodb); const url mongodb://admin:admin127.0.0.1:27017; const dbName itying;/* 4.实例化MongoClient 传入数据库连接地址 */ // const client new MongoClient(url, { useUnifiedTopology: true });// 注册web服务 http.createServer(app).listen(8081); // app.static(public); // 修改默认静态web目录 // 配置路由 app.get(/, function (req, res) {MongoClient.connect(url, { useUnifiedTopology: true }, (err, client) {/* 5.连接数据库 */client.connect((err) {if (err) {console.log(数据库连接失败);return;}console.log(数据库连接成功);let db client.db(dbName);// 查找数据db.collection(user).find({}).toArray((err, result) {if (err) {console.log(err);return;}console.log(result);client.close();ejs.renderFile(./views/index.ejs, {list: result}, (err, data) {res.send(data);})})})})})app.get(/register, function (req, res) {ejs.renderFile(./views/register.ejs,{}, (err, data) {res.send(data);}) })app.post(/doRegister, function (req, res) {let body querystring.parse(req.body)console.log(body)MongoClient.connect(url, { useUnifiedTopology: true }, (err, client) {if (err) {console.log(数据库连接失败);return;}console.log(数据库连接成功);let db client.db(dbName);db.collection(user).insertOne(body, (err, result) {if (err) {console.log(err);return;}console.log(添加数据成功);res.send(添加数据成功);})}) })console.log(Server running at http://127.0.0.1:8081/);routes.js: const url require(url) const path require(path) const fs require(fs)// 扩展res function changeRes(res) {res.send (data) {res.writeHead(200, { Content-Type: text/html;charsetutf-8 });res.end(data);} }// 根据后缀名获取文件类型 let getFileMime function (extname) {// 把异步读取文件方法改为同步读取文件方法let data fs.readFileSync(./data/mime.json);let mimeObj JSON.parse(data.toString())console.log(mimeObj[extname])return mimeObj[extname] }// 静态web服务的方法 function initStatic (req, res, staticPath){// 1. 获取地址console.log(req.url)let pathname url.parse(req.url).pathname// 默认加载index.htmlif (pathname /) {pathname /index.html} else {pathname pathname}// 获取路径中的后缀名let extname path.extname(pathname)// 2.通过fs模块读取文件try {// 把异步读取文件方法改为同步读取文件方法let data fs.readFileSync(./ staticPath pathname);if (data) {let mine getFileMime(extname)res.writeHead(200, { Content-Type: mine ;charsetutf-8 });res.end(data);}} catch (error) {} }let server () {let G {_get: {}, // 把get 和 post分开保存_post: {},staticPath: static // 静态资源web目录}let app function (req, res) {// 扩展res的方法changeRes(res)// 配置静态web服务器initStatic(req, res, G.staticPath)// 路由let pathname url.parse(req.url).pathname;// http://127.0.0.1:3000/login pathname /login// 获取请求类型let method req.method.toLowerCase()if (G[_ method][pathname]) {if (method get) {G[_ method][pathname](req, res); // 表示执行方法} else {// post 获取post的数据 把它绑定到req.body上let postData ;req.on(data, (chunk) {postData chunk;})req.on(end, () {console.log(postData)req.body postDataG._post[pathname](req, res); // 表示执行方法})}} else {res.writeHead(404, { Content-Type: text/html;charsetutf-8 });res.end(页面不存在);}}app.get function (string, callback) {// 注册方法G._get[string] callback/* G[/login] function(req, res) {res.send(hello world)}*/// console.log(get方法)}app.post function (string, callback) {// 注册方法G._post[string] callback}// 配置静态web服务目录app.static function (staticPath){G.staticPath staticPath}return app;} module.exports server() mime.json: { .323:text/h323 ,.3gp:video/3gpp ,.aab:application/x-authoware-bin ,.aam:application/x-authoware-map ,.aas:application/x-authoware-seg ,.acx:application/internet-property-stream ,.ai:application/postscript ,.aif:audio/x-aiff ,.aifc:audio/x-aiff ,.aiff:audio/x-aiff ,.als:audio/X-Alpha5 ,.amc:application/x-mpeg ,.ani:application/octet-stream ,.apk:application/vnd.android.package-archive ,.asc:text/plain ,.asd:application/astound ,.asf:video/x-ms-asf ,.asn:application/astound ,.asp:application/x-asap ,.asr:video/x-ms-asf ,.asx:video/x-ms-asf ,.au:audio/basic ,.avb:application/octet-stream ,.avi:video/x-msvideo ,.awb:audio/amr-wb ,.axs:application/olescript ,.bas:text/plain ,.bcpio:application/x-bcpio ,.bin :application/octet-stream ,.bld:application/bld ,.bld2:application/bld2 ,.bmp:image/bmp ,.bpk:application/octet-stream ,.bz2:application/x-bzip2 ,.c:text/plain ,.cal:image/x-cals ,.cat:application/vnd.ms-pkiseccat ,.ccn:application/x-cnc ,.cco:application/x-cocoa ,.cdf:application/x-cdf ,.cer:application/x-x509-ca-cert ,.cgi:magnus-internal/cgi ,.chat:application/x-chat ,.class:application/octet-stream ,.clp:application/x-msclip ,.cmx:image/x-cmx ,.co:application/x-cult3d-object ,.cod:image/cis-cod ,.conf:text/plain ,.cpio:application/x-cpio ,.cpp:text/plain ,.cpt:application/mac-compactpro ,.crd:application/x-mscardfile ,.crl:application/pkix-crl ,.crt:application/x-x509-ca-cert ,.csh:application/x-csh ,.csm:chemical/x-csml ,.csml:chemical/x-csml ,.css:text/css ,.cur:application/octet-stream ,.dcm:x-lml/x-evm ,.dcr:application/x-director ,.dcx:image/x-dcx ,.der:application/x-x509-ca-cert ,.dhtml:text/html ,.dir:application/x-director ,.dll:application/x-msdownload ,.dmg:application/octet-stream ,.dms:application/octet-stream ,.doc:application/msword ,.docx:application/vnd.openxmlformats-officedocument.wordprocessingml.document ,.dot:application/msword ,.dvi:application/x-dvi ,.dwf:drawing/x-dwf ,.dwg:application/x-autocad ,.dxf:application/x-autocad ,.dxr:application/x-director ,.ebk:application/x-expandedbook ,.emb:chemical/x-embl-dl-nucleotide ,.embl:chemical/x-embl-dl-nucleotide ,.eps:application/postscript ,.epub:application/epubzip ,.eri:image/x-eri ,.es:audio/echospeech ,.esl:audio/echospeech ,.etc:application/x-earthtime ,.etx:text/x-setext ,.evm:x-lml/x-evm ,.evy:application/envoy ,.exe:application/octet-stream ,.fh4:image/x-freehand ,.fh5:image/x-freehand ,.fhc:image/x-freehand ,.fif:application/fractals ,.flr:x-world/x-vrml ,.flv:flv-application/octet-stream ,.fm:application/x-maker ,.fpx:image/x-fpx ,.fvi:video/isivideo ,.gau:chemical/x-gaussian-input ,.gca:application/x-gca-compressed ,.gdb:x-lml/x-gdb ,.gif:image/gif ,.gps:application/x-gps ,.gtar:application/x-gtar ,.gz:application/x-gzip ,.h:text/plain ,.hdf:application/x-hdf ,.hdm:text/x-hdml ,.hdml:text/x-hdml ,.hlp:application/winhlp ,.hqx:application/mac-binhex40 ,.hta:application/hta ,.htc:text/x-component ,.htm:text/html ,.html:text/html ,.hts:text/html ,.htt:text/webviewhtml ,.ice:x-conference/x-cooltalk ,.ico:image/x-icon ,.ief:image/ief ,.ifm:image/gif ,.ifs:image/ifs ,.iii:application/x-iphone ,.imy:audio/melody ,.ins:application/x-internet-signup ,.ips:application/x-ipscript ,.ipx:application/x-ipix ,.isp:application/x-internet-signup ,.it:audio/x-mod ,.itz:audio/x-mod ,.ivr:i-world/i-vrml ,.j2k:image/j2k ,.jad:text/vnd.sun.j2me.app-descriptor ,.jam:application/x-jam ,.jar:application/java-archive ,.java:text/plain ,.jfif:image/pipeg ,.jnlp:application/x-java-jnlp-file ,.jpe:image/jpeg ,.jpeg:image/jpeg ,.jpg:image/jpeg ,.jpz:image/jpeg ,.js:application/x-javascript ,.jwc:application/jwc ,.kjx:application/x-kjx ,.lak:x-lml/x-lak ,.latex:application/x-latex ,.lcc:application/fastman ,.lcl:application/x-digitalloca ,.lcr:application/x-digitalloca ,.lgh:application/lgh ,.lha:application/octet-stream ,.lml:x-lml/x-lml ,.lmlpack:x-lml/x-lmlpack ,.log:text/plain ,.lsf:video/x-la-asf ,.lsx:video/x-la-asf ,.lzh:application/octet-stream ,.m13:application/x-msmediaview ,.m14:application/x-msmediaview ,.m15:audio/x-mod ,.m3u:audio/x-mpegurl ,.m3url:audio/x-mpegurl ,.m4a:audio/mp4a-latm ,.m4b:audio/mp4a-latm ,.m4p:audio/mp4a-latm ,.m4u:video/vnd.mpegurl ,.m4v:video/x-m4v ,.ma1:audio/ma1 ,.ma2:audio/ma2 ,.ma3:audio/ma3 ,.ma5:audio/ma5 ,.man:application/x-troff-man ,.map:magnus-internal/imagemap ,.mbd:application/mbedlet ,.mct:application/x-mascot ,.mdb:application/x-msaccess ,.mdz:audio/x-mod ,.me:application/x-troff-me ,.mel:text/x-vmel ,.mht:message/rfc822 ,.mhtml:message/rfc822 ,.mi:application/x-mif ,.mid:audio/mid ,.midi:audio/midi ,.mif:application/x-mif ,.mil:image/x-cals ,.mio:audio/x-mio ,.mmf:application/x-skt-lbs ,.mng:video/x-mng ,.mny:application/x-msmoney ,.moc:application/x-mocha ,.mocha:application/x-mocha ,.mod:audio/x-mod ,.mof:application/x-yumekara ,.mol:chemical/x-mdl-molfile ,.mop:chemical/x-mopac-input ,.mov:video/quicktime ,.movie:video/x-sgi-movie ,.mp2:video/mpeg ,.mp3:audio/mpeg ,.mp4:video/mp4 ,.mpa:video/mpeg ,.mpc:application/vnd.mpohun.certificate ,.mpe:video/mpeg ,.mpeg:video/mpeg ,.mpg:video/mpeg ,.mpg4:video/mp4 ,.mpga:audio/mpeg ,.mpn:application/vnd.mophun.application ,.mpp:application/vnd.ms-project ,.mps:application/x-mapserver ,.mpv2:video/mpeg ,.mrl:text/x-mrml ,.mrm:application/x-mrm ,.ms:application/x-troff-ms ,.msg:application/vnd.ms-outlook ,.mts:application/metastream ,.mtx:application/metastream ,.mtz:application/metastream ,.mvb:application/x-msmediaview ,.mzv:application/metastream ,.nar:application/zip ,.nbmp:image/nbmp ,.nc:application/x-netcdf ,.ndb:x-lml/x-ndb ,.ndwn:application/ndwn ,.nif:application/x-nif ,.nmz:application/x-scream ,.nokia-op-logo:image/vnd.nok-oplogo-color ,.npx:application/x-netfpx ,.nsnd:audio/nsnd ,.nva:application/x-neva1 ,.nws:message/rfc822 ,.oda:application/oda ,.ogg:audio/ogg ,.oom:application/x-AtlasMate-Plugin ,.p10:application/pkcs10 ,.p12:application/x-pkcs12 ,.p7b:application/x-pkcs7-certificates ,.p7c:application/x-pkcs7-mime ,.p7m:application/x-pkcs7-mime ,.p7r:application/x-pkcs7-certreqresp ,.p7s:application/x-pkcs7-signature ,.pac:audio/x-pac ,.pae:audio/x-epac ,.pan:application/x-pan ,.pbm:image/x-portable-bitmap ,.pcx:image/x-pcx ,.pda:image/x-pda ,.pdb:chemical/x-pdb ,.pdf:application/pdf ,.pfr:application/font-tdpfr ,.pfx:application/x-pkcs12 ,.pgm:image/x-portable-graymap ,.pict:image/x-pict ,.pko:application/ynd.ms-pkipko ,.pm:application/x-perl ,.pma:application/x-perfmon ,.pmc:application/x-perfmon ,.pmd:application/x-pmd ,.pml:application/x-perfmon ,.pmr:application/x-perfmon ,.pmw:application/x-perfmon ,.png:image/png ,.pnm:image/x-portable-anymap ,.pnz:image/png ,.pot,:application/vnd.ms-powerpoint ,.ppm:image/x-portable-pixmap ,.pps:application/vnd.ms-powerpoint ,.ppt:application/vnd.ms-powerpoint ,.pptx:application/vnd.openxmlformats-officedocument.presentationml.presentation ,.pqf:application/x-cprplayer ,.pqi:application/cprplayer ,.prc:application/x-prc ,.prf:application/pics-rules ,.prop:text/plain ,.proxy:application/x-ns-proxy-autoconfig ,.ps:application/postscript ,.ptlk:application/listenup ,.pub:application/x-mspublisher ,.pvx:video/x-pv-pvx ,.qcp:audio/vnd.qcelp ,.qt:video/quicktime ,.qti:image/x-quicktime ,.qtif:image/x-quicktime ,.r3t:text/vnd.rn-realtext3d ,.ra:audio/x-pn-realaudio ,.ram:audio/x-pn-realaudio ,.rar:application/octet-stream ,.ras:image/x-cmu-raster ,.rc:text/plain ,.rdf:application/rdfxml ,.rf:image/vnd.rn-realflash ,.rgb:image/x-rgb ,.rlf:application/x-richlink ,.rm:audio/x-pn-realaudio ,.rmf:audio/x-rmf ,.rmi:audio/mid ,.rmm:audio/x-pn-realaudio ,.rmvb:audio/x-pn-realaudio ,.rnx:application/vnd.rn-realplayer ,.roff:application/x-troff ,.rp:image/vnd.rn-realpix ,.rpm:audio/x-pn-realaudio-plugin ,.rt:text/vnd.rn-realtext ,.rte:x-lml/x-gps ,.rtf:application/rtf ,.rtg:application/metastream ,.rtx:text/richtext ,.rv:video/vnd.rn-realvideo ,.rwc:application/x-rogerwilco ,.s3m:audio/x-mod ,.s3z:audio/x-mod ,.sca:application/x-supercard ,.scd:application/x-msschedule ,.sct:text/scriptlet ,.sdf:application/e-score ,.sea:application/x-stuffit ,.setpay:application/set-payment-initiation ,.setreg:application/set-registration-initiation ,.sgm:text/x-sgml ,.sgml:text/x-sgml ,.sh:application/x-sh ,.shar:application/x-shar ,.shtml:magnus-internal/parsed-html ,.shw:application/presentations ,.si6:image/si6 ,.si7:image/vnd.stiwap.sis ,.si9:image/vnd.lgtwap.sis ,.sis:application/vnd.symbian.install ,.sit:application/x-stuffit ,.skd:application/x-Koan ,.skm:application/x-Koan ,.skp:application/x-Koan ,.skt:application/x-Koan ,.slc:application/x-salsa ,.smd:audio/x-smd ,.smi:application/smil ,.smil:application/smil ,.smp:application/studiom ,.smz:audio/x-smd ,.snd:audio/basic ,.spc:application/x-pkcs7-certificates ,.spl:application/futuresplash ,.spr:application/x-sprite ,.sprite:application/x-sprite ,.sdp:application/sdp ,.spt:application/x-spt ,.src:application/x-wais-source ,.sst:application/vnd.ms-pkicertstore ,.stk:application/hyperstudio ,.stl:application/vnd.ms-pkistl ,.stm:text/html ,.svg:image/svgxml ,.sv4cpio:application/x-sv4cpio ,.sv4crc:application/x-sv4crc ,.svf:image/vnd ,.svg:image/svgxml ,.svh:image/svh ,.svr:x-world/x-svr ,.swf:application/x-shockwave-flash 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