Pure front end, did not contact the background database before, now study mongodb database, encounter such a situation, set up a blog database, there is such a collection containing all the article information, the data forgery is as follows: { "i...
problem description < H2 > how does mongoose jointly check and complete the data and then classify and aggregate according to the fields of the joint search? < H2 > I now have two tables: a product table Product , a product category table Category...
1 you can output query information during unit test, use swagger2 to test the following errors, debug can also output results normally. ...
Room schema var Room = new Schema({ title: String, author: String, body: String, owners: [ { type: ObjectId, ref: User , index: true } ] }) Room.find({ owners: user }) first question: why can the query here be written this way? How...
there are two tables in the database with different names and the same data format. if I want to check the data in both tables that meet the criteria at the same time, except that I check them separately and return a collection. Is there any other way...
1. A user created in the admin database in MongoDB that is used to connect to another database myBase; 2. Use mongoose to connect to MongoDB, when the connection address is mongodb: username:password@my-server myBase?authSource=admin 3. Unable ...
after the Node server runs, it connects to the Mongo database and reports an error: how to solve it? ...
mongod --dbpath usr local var mongodb 2018-07-03T10:50:12.444+0800 I CONTROL [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols none 2018-07-03T10:50:12.457+0800 I CONTROL [initandlisten] MongoDB starti...
1. When I try to start the MongoDB service through service mongod start , I find that the log cannot be started . excuse me, why is this ...
2018-07-05 16 virtual 17 dispatcherServlet 02.005 ERROR 28380-[nio-9002-exec-4] o.a.c.c.C. [ ]. [dispatcherServlet]: Servlet.service () for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested excepti...
first of all, mongodb is installed normally. It is installed in D: mongodb (folder), and the database is stored in D: mongoData (database folder). When joining the system service, it is added through configuration file parameters (mongodb version 3.6) ...
the general situation is about the same as this https: cnodejs.org topic 50d. schema: const userInfoSchema = new Schema({ uId: String, userId: Number, wxInfo: { unionid: String, openid: String, nickName: String, avatarUrl: Stri...
Save the information of the article in Mongo. I want to repeat the article by the title of the article to judge as follows , :, , ,!! ,!! ,!! articles considered to be duplicates can be found by creating a text index on the title of the article a...
mongodb database has a day field that stores the string type, as shown in figure . now I m going to filter the data for different time periods through the day field, but write like this req.collections.dayTrainings.count({ phone : req.param( ...
then found this log in the log. Baidu hasn t found the answer for a long time. Have a look at it ...
1. usr local mongodb bin mongod --config usr local mongodb bin mongodb.conf ask the great gods, how can you let mongodb start itself? What is the cause of this problem? How to avoid and modify it? ...
mongodb configuration copy set cannot start mongo after more than one net.bindIp is set Screenshot of error message is as follows mongod.conf Startup mode is: systemctl start mongod.service operating system is centos 7.2 ...
When the official document on mongoose says that the autoIndex property is true, when the application starts, mongoose will automatically call ensureIndex for your schema to ensure that the index is generated. It is good to use this in the development en...
new Schema({ pid: {type: String, ref: product }, sid: {type: String, ref: sale }, })); suppose there are product and sale two collections pid and sid both specify user_id of the product and sale collections instead of _ id ...
react+nodejs+express+mongodb+axios+antd-mobile Instant messaging app can send and receive instant messages normally on PC, but not on mobile browsers. clicking and sending on mobile phone can pop up alert events, but the message cannot be sent, and th...
how electron-vue saves blob objects locally ...
because of the paging function in the page and the use of overflow:auto, there is a change in the length of the scroll bar when the amount of data in the page is different. However, under edge, when the scroll bar changes from short to long, you cannot u...
there is no problem with the exact same logic under CPP. Python reports RecursionError: maximum recursion depth exceeded in comparison . def merge(a:list, start:int, end:int, mid:int): t=deepcopy(a) i=start j=mid k=start while ...
MySQL,select uses in to query. There are about 5000 items in the collection after in. There are many records in this table. The fields in in query are indexed . the original SQL is similar to this SELECT a FROM table WHERE an in ( 1x code 2 ) and o...
when vue2 + iview + vue-i18n is introduced globally, the internationalization is switched globally, and the select option can be switched normally . <template> <div> <Select v-model="form.select" style="width:200px"...