I am myself a starter on NoSQL databases. So I am answering this at the expense of potential down votes but it will be a great learning experience for me. Before trying my best to answer your questions I should say that if MS SQL Server is working well for you then stick with it. … Read more
I dug into the source code and learned how Schema class is converted by the SchemaFactory.createForClass method. Well so how it works? 1. Take a look at this example below: @Schema() export class Cat extends Document { @Prop() name: string; } export const catSchema = SchemaFactory.createForClass(Cat); Basically, when you do SchemaFactory.createForClass(Cat) Nest will convert the … Read more
Your schema looks perfectly fine, you might see the others (including myself today) came with more or less the same structure before (Storing messages of different chats in a single database table, Database schema for one-to-one and group chat, Creating a threaded private messaging system like facebook and gmail). I’d really like to note that … Read more
The schemas don’t exist as an xml file. Schemas are dependent upon what UI classes your program uses. There’s a slightly better discussion here.
We found class diagrams to actually be one of the best ways to represent a mongo schema design. It can capture most of the items that a document will have such as arrays, embedded objects and even references. General guidelines we use to relate onto concepts to uml Embed = Composition aggregation Reference = Association … Read more
The URI is the namespace name, which identifies the namespace. While, in case of some URI schemes (like http, https, ftp etc.), it would be possible to provide the schema (or other related information), this is “not a goal”: It is not a goal that it be directly usable for retrieval of a schema (if … Read more
Mongoose 3.8.1 now has support for Discriminators. A sample, from here: http://mongoosejs.com/docs/api.html#model_Model.discriminator function BaseSchema() { Schema.apply(this, arguments); this.add({ name: String, createdAt: Date }); } util.inherits(BaseSchema, Schema); var PersonSchema = new BaseSchema(); var BossSchema = new BaseSchema({ department: String }); var Person = mongoose.model(‘Person’, PersonSchema); var Boss = Person.discriminator(‘Boss’, BossSchema);
I pondered about these same questions and I hope this will be helpful to you. 1. I don’t believe that appending Interface at the end of every interface is idiomatic. It is much better to have a descriptive name instead. Consider the example provided in the GraphQL Specification relating to Interfaces. They don’t append Interface … Read more
From developer.android.com xmlns:android Defines the Android namespace. This attribute should always be set to “http://schemas.android.com/apk/res/android”. xmlns:android is for identification that this xml is used for android, not for other function. Namespaces uniquely identify code/libraries. If I write an api that uses all the same names and such as the android api the only way to … Read more
sqlite> .header on sqlite> .mode column sqlite> create table ABC(A TEXT, B VARCHAR); sqlite> pragma table_info(ABC); cid name type notnull dflt_value pk ———- ———- ———- ———- ———- ———- 0 A TEXT 0 0 1 B VARCHAR 0 0