{useNewUrlParser:true,useUnifiedTopology:true});client.connect(asyncerr=>{if(err)throwerr;constdb=client.db("mydb");constcollection=db.collection("users");constquery={age:{$in:[25,30]}};constresult=awaitcollection.find(query).toArray();console.log(result);...
queryPlanner.winningPlan.isMultiKey是否是Multikey,此处返回是false,如果索引建立在array上,此处将是true。 queryPlanner.winningPlan.direction:此query的查询顺序,此处是forward,如果用了.sort({modify_time:-1})将显示backward。 queryPlanner.winningPlan.indexBounds:winningplan所扫描的索引范围,如果没有制定范围就...
Leading to validation error in MongoDB as it expected an array. Now, since the MongoDB PHP driver does not do parse your MongoDB query we cannot know which array should be exempted from this serialization rule. The workaround is, as mentioned above, is to ensure your PHP arrays are numer...
cursor= db.inventory.find({"size.uom":"in"}) cursor= db.inventory.find({"size.h": {"$lt":15}}) cursor= db.inventory.find({"size.h": {"$lt":15},"size.uom":"in","status":"D"}) 五、嵌套array数据格式的查询: 1.shell查询array嵌套数据如下: db.inventory.insertMany([ { item:...
Query You can query arrays in MongoDB using the following methods: Your programming language's driver. TheMongoDB Atlas UI. To learn more, seeQuery an Array with MongoDB Atlas. MongoDB Compass. ➤ Use theSelect your languagedrop-down menu in the upper-right to set the language of the ...
either json or csv (defaults to 'json') -o, --out= output file; if not specified, stdout is used --jsonArray output to a JSON array rather than one object per line --pretty output JSON formatted to be human-readable querying options: -q, --query= query filter, as a JSON string,...
You cannot use $size to find a range of sizes (for example: arrays with more than 1 element). If you need to query for a range, create an extra size field that you increment when you add elements. 7)$exists $exists用来判断一个元素是否存在: ...
queryPlanner: MongoDB 运行查询优化器对当前的查询进行评估并选择一个最佳的查询计划。 exectionStats:mongoDB 运行查询优化器对当前的查询进行评估并选择一个最佳的查询计划进行执行。在执行完毕后返回这个最佳执行计划执行完成时的相关统计信息。 allPlansExecution:即按照最佳的执行计划执行以及列出统计信息,如果有多个查...
我试图在另一个数组字段上使用$elemMatch和$in操作符更新数组中的对象。 我的查询如下所示: var query = {array:{$in: ['second']},objectList: {$elemMatch: {toMatch: {$exists: true}}} }; db.foo.update(query, {$set: {'objectList.$.toChange':10}}, {multi: true}) ...
MongoDB Manual: code examples for query operations on array fields. Learn how to query an array and an array element or field, query on the array field as a whole, query if a field is in an array, and query by array size.