problem description aggregates data in a specified format into a specified format related codes { "_id" : "10.182.135.21_CPU_20180627200000", "parameter" : { "CPUUtil" : [ { ...
is to create a data table of contacts, and then the front end searches the corresponding friends through its own username and traverses to the page this is my mongoose schema var contactSchema = new Schema({ user1:{ type:Object, required:true...
< H2 > for example, there are two tables < H2 > student Table id-> user id name-> user name classId-> Class id class Table id-> Class id name-> Class name if I want to query the information of all the students and the class information they b...
I am using Java to implement a function of bulk importing data into MongoDB. my idea is to read the target content, convert it to a Document object, put it into List, and then import it into the library through the insertMany method of MongoDB Driver....
I want to write a comic platform server, comics will be divided into paid and free, how should I deal with these picture resources. If I put it on oss, how can I tell whether the requesting user has paid or not? under the guidance of which god, I would b...
you can add or modify data in mongodb by Synchronize to ES, but when you delete data, the deleted data is still saved in ES. data in mongodb: ES: ...
mongodb implements document locking. When a document is updated, a write lock is created on the updated document, and the document cannot be read or modified at the same time. if mongodb connection pool establishes multiple connections, multiple reque...
> db.test.find() { "_id" : ObjectId("5c08e86cbfd9756856063341"), "name" : "xiaobin", "age" : 27, "gender" : "male" } { "_id" : ObjectId("5c09ddb5ca83e5589d6754ef"...
spring integration MongoDB, wants to add and modify functions in a method. After using mongoTemplate.upsert, it is found that the id value of inserting new data is null, but there is id in insert insertion. Why? How to solve? I am not very familiar with ...
there is a system that plans to migrate from php+mysql to nodejs+mongodb , but as shown in the figure, the query efficiency of the same 2001 pieces of data is 5 times different, and the data structure is exactly the same. is this normal? It feels total...
how to view how many pieces of data in a collection of mongodb what statements can be checked? ...
...
in the slow log, a table is queried according to the index and 0 items of data are returned. Millis shows that it takes more than 200ms, but the executionTimeMillisEstimate of each execution phase is 0. imitates this query record to query in shell, and...
def getuser(): users = user.find({ totalRecharge : { $gt : 0}, $or : [ { recharge.from : weixin }, { recharge.from : alipay }, { recharge.from : { $ne : jCode }}, ...
system ubuntu16.04, mongo 3.2.8 tcmalloc is the default parameter. you cannot start mongo after configuring LD_PRELOAD= usr lib libtcmalloc.so.4 in etc environment. is there any parameter that needs to be set? ...
problem description there are the following collection,. I need to group statistics according to the name quote.sign field, fetch the latest record according to the last_updated time, or extract the data in the existing format according to the maximum...
problem description official documentation shardKey configuration instructions: configure the code according to the official document as follows: (the code has been deleted) new Schema( { eId: { type: String, default: null }, eAr...
db.col.createIndex ({ "title ": 1}) then how to find it through this index? ...
scenario: the front-end vue separates axios and passes a parameter to the back-end. You want to use the back-end to realize the fuzzy search function. After filtering the data, you return it to the foreground and get the fuzzy query condition of MongoD...
pecl install mongodb fails: fatal error: Security Security.h file not found ERROR: make failed private tmp pear install mongodb src libmongoc src libmongoc src mongoc mongoc-rand-common-crypto.c:25:10: fatal error: Security Security.h ...
The a tag sets the font color. It is normal to open the color in Wechat and the phone s own browser, but it is not normal to open the color in the UC browser. How can the font color of the a tag be compatible with the mobile UC browser? ...
learn the content of vue asynchronous component, and write the simplest asynchronous component demo : : : : js . have you ever encountered similar problems, please help solve webpack version 4.8.3, ...
find an algorithm for generating a user s uid ...
problem description nextjs is clicked with parameters to jump to the next page. If you want to get the passed value on the next page, for example, the index.js under the Pages page in react clicks a value with a value, and the offer.js, under Pages wa...
Business scenario Business Code startDate: { disabledDate: (time) => { let timeChange = false; this.basicInfo.salesDateRange.forEach((item, index) => { ...