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 ....
the framework of react-based ant design mobile does not write Chinese text directly in the code, so where is the Chinese text written and how should it be used? ask for advice, one for beginners ...
java s web service is deployed on linux. When upgrading a new version of kill-9 XXXX, some unprocessed requests are aborted, especially some operations to write to the database. is there any way to stop service after the current request is successfull...
Mongoose sorting by a field in the reference document does not work I want to sort by aliInfo.creditLev in owner, but the result does not work. I changed several fields that do not take effect. I feel that the sort in populate is misused. Please wr...
problem description many articles say that it should be lower than 16ms, and if you exceed 16ms, you will lose the frame. How do you understand it ...
refer to the figure above, existing permission:{ id:DataTypes.INTEGER, type:DataTypes.STRING } Operate:{ id:DataTypes.INTEGER, name:DataTypes.STRING url:DataTypes.STRING } how to write associate? for permission Can you dy...