node js,sails js,waterline. I need to update(or push) values into the below schema after insert I am using sailsjs with waterline and mongodb. { "countries": { "states": [ { "statename": "state", "districts": [ { "distname": "district", "cities": [ { "cityname": "Hyderabad...
$push 在结果文档中插入值到一个数组中。 db.col.aggregate([{$group : {_id : "$by_user", url : {$push: "$url"}}}]) $addToSet 在结果文档中插入值到一个数组中,但不创建副本。 db.col.aggregate([{$group : {_id : "$by_user", url : {$addToSet : "$url"}}}]) $first 根据资源...
"shards": {$push:"$indexDoc.shard"}, //Convert each indexspecification into an array of its properties // that can becompared using setoperators. "specs": {$push: {$objectToArray: {$ifNull: ["$indexDoc.spec", {}]}}}, "allShards": {$first:"$allShards"} ...
(表)中插入新文档 * * 说明: * 1:类似mysql中的: insert into $colName set id=1,name='name1'; * * @param string $colName 集合名 * @param array $sets 数据,如: array('id'=>1,'name'=>'name1') * @param boolean $safe 是否安全操作 false:不等待服务器的响应直接返回 true:等待服务...
"errmsg" : "exception: $unwind: value at end of field path must be an array", "code" : 15978, "ok" : 0 } at src/mongo/shell/collection.js:L898 d.如果$unwind目标字段数组为空的话,该文档也将会被忽略。 6.$group 对数据进行分组 ...
charsets.push({type:"vowels", chars:vowels}); }if(other.length){ charsets.push({type:"other", chars:other}); } var wordObj={ word: word, first: word[0],last: word[word.length-1], size: word.length, letters: letters, stats: { vowels: vowelCnt, consonants: consonantCnt }, ...
{ _id: "$Cast", allMoviesArray: {$push: {$concat: ["$Title", " (", { $substr: ["$Year", 0, 4] }, ")"] } }, moviesCount: { $sum: 1 }, maxYear: { $last: "$Year" }, minYear: { $first: "$Year" } } }, { $project: { moviesCount: 1, timeSpan: { $...
("nfit");//获取数据库let students=await db.collection("students");//获取集合let query={id:{$gte:202201}};//查询条件是id大于等于202201let cursor=await students.find(query);//执行查询并返回游标对象let result=[];//学生数组,返回包装用await cursor.forEach(data=>result.push(data));//遍历...
{users.push({name:`User${i}`,age:Math.floor(Math.random()*100)});}awaitcollection.insertMany(users);// 查询年龄大于50的用户constresults=awaitcollection.find({age:{$gt:50}}).toArray();console.log(`Found${results.length}users aged over 50`);}finally{awaitclient.close();}}run()....
As you can see from the result of the example above, the result can be converted into an array containing each document as an object. To return e.g. the address of the third document, just refer to the third array object's address property: ...