there is an array cateogoryList in the defined Schema: const mongoose = require( mongoose ); const Schema = mongoose.Schema; const ProductCateogorySchema = new Schema({ user:{ type:Schema.Types.ObjectId, ref:"users...
there are system An and system B. system An owns database An independently, and system B owns database B. system An and system B share a set of user information database, database C. Database C stores all the information about the user, such as name...
after reading this article (introducing schema in the database) https: www.biaodianfu.com da., it is mentioned that the schema in MySQL is the same as the library. Is this correct? Thank you ....
if you want to add a person 6.0, how to achieve ...
because the project needs, when writing css, you don t need to write units, just write numbers, but W3C s rule stipulates that all units need to be written except 0, so webstorm will give a warning. (the following line-hight is deliberately misspe...
problem description deploying spark on kubernetes requires at least 3 CPU. Using the kubernetes feature of docker will cause an error 1 Insufficient cpu, 1 Insufficient memory . the environmental background of the problems and what methods you ha...
there are four buttons on the right side of the top. Under each button, an echarts, is displayed by the current echarts when a button is clicked. By default, the echarts, under the first button thinks of the click time on the registration button first,...
String s1 = new StringBuilder().append("").append("").toString(); System.out.println(s1.intern() == s1); String s2 = new StringBuilder().append("ja").append("va").toString(); System.out.println(s2.intern() == s2); ...