mongodb

问题 I'm trying to build a category tree from a term collection in Mongo/Node, but first I select all tree elements using $in: console.time('termsCol.find'); var terms = await termsCol.find({term_id: {'$in': flatTree}}); console.timeEnd('termsCol.find'); console.time('termsCol.toArray'); terms = await terms.toArray(); console.timeEnd('termsCol.toArray'); This performs: termsCol.find: 0.162ms termsCol.toArray: 30.910ms I've read posts about toArray performance on SO, but would like to know if

问题 I am looking for a way to search for a keyword (ex. "Henrik") in the "answers" array of documents with the following structure Array ( [_id] => MongoId Object ( [$id] => 4eeedd9545c717620a000007 ) [formId] => 6 [respId] => 4eeedd95c93228 [dateCreated] => 2011-10-14 07:45 [answers] => Array ( [field1] => Henrik [field6] => myemail@domain.com [field7] => my city address ) ) I am working in PHP on this project, and quering like this works of course: $answers = $collection->find( array('formId' =

问题 I am looking for a way to search for a keyword (ex. "Henrik") in the "answers" array of documents with the following structure Array ( [_id] => MongoId Object ( [$id] => 4eeedd9545c717620a000007 ) [formId] => 6 [respId] => 4eeedd95c93228 [dateCreated] => 2011-10-14 07:45 [answers] => Array ( [field1] => Henrik [field6] => myemail@domain.com [field7] => my city address ) ) I am working in PHP on this project, and quering like this works of course: $answers = $collection->find( array('formId' =

问题 the data structure is like: way: { _id:'9762264' node: ['253333910', '3304026514'] } and I'm trying to count the frequency of nodes' appearance in ways. Here is my code using pymongo: node = db.way.aggregate([ {'$unwind': '$node'}, { '$group': { '_id': '$node', 'appear_count': {'$sum': 1} } }, {'$sort': {'appear_count': -1}}, {'$limit': 10} ], {'allowDiskUse': True} ) it will report an error: Traceback (most recent call last): File "<input>", line 1, in <module> File ".../OSM Wrangling

问题 I'm using MongoMemoryServer to write an integration test. I have two integration test files. When I run the IT tests I see the following. I don't understand why. I'm using jestjs test framework. I'm seeing the following error when I have two IT test files MongoError: pool is draining, new operations prohibited 37 | for (const key in collections) { 38 | const collection = collections[key]; > 39 | await collection.deleteMany(); | ^ 40 | } 41 | }; Here is my setup //db-handler.js const mongoose

问题 I have three unique indexes in my collection. When user accidentally insert a data having a duplicate in the field B , how do I know that the duplication comes from field B ? On unique index constraint violation, mongo-go-driver behavior is returning err WriteException , which basically consist of an array of WriteError and some other object. The WriteError itself (from mongo-go-driver) : // WriteError is an error that occurred during the execution of a write operation. This error type is

问题 While trying to access mongodb from my QA enviornment its showing the below error. java.lang.NoSuchMethodError: com.mongodb.MongoClient.<init> (Ljava/util/List;Lcom/mongodb/MongoCredential;Lcom/mongodb/MongoClientOptions;)V] The same is working from my local env. The mongo driver im using in 3.6.2 and java version is 1.8. Please help 回答1: When I updated to version 3.8.0, it worked. My problem occurred because I've updated the Spring Data Mongo and forgot to update the Mongo Driver. 来源： https:

问题 While trying to access mongodb from my QA enviornment its showing the below error. java.lang.NoSuchMethodError: com.mongodb.MongoClient.<init> (Ljava/util/List;Lcom/mongodb/MongoCredential;Lcom/mongodb/MongoClientOptions;)V] The same is working from my local env. The mongo driver im using in 3.6.2 and java version is 1.8. Please help 回答1: When I updated to version 3.8.0, it worked. My problem occurred because I've updated the Spring Data Mongo and forgot to update the Mongo Driver. 来源： https:

问题 While trying to access mongodb from my QA enviornment its showing the below error. java.lang.NoSuchMethodError: com.mongodb.MongoClient.<init> (Ljava/util/List;Lcom/mongodb/MongoCredential;Lcom/mongodb/MongoClientOptions;)V] The same is working from my local env. The mongo driver im using in 3.6.2 and java version is 1.8. Please help 回答1: When I updated to version 3.8.0, it worked. My problem occurred because I've updated the Spring Data Mongo and forgot to update the Mongo Driver. 来源： https:

问题 While trying to access mongodb from my QA enviornment its showing the below error. java.lang.NoSuchMethodError: com.mongodb.MongoClient.<init> (Ljava/util/List;Lcom/mongodb/MongoCredential;Lcom/mongodb/MongoClientOptions;)V] The same is working from my local env. The mongo driver im using in 3.6.2 and java version is 1.8. Please help 回答1: When I updated to version 3.8.0, it worked. My problem occurred because I've updated the Spring Data Mongo and forgot to update the Mongo Driver. 来源： https: