Query data
Creating a query is very simple. ng-sapphiredb uses RxJs to provide the values of the collection.
You first have to create a collection object using the method SapphireDb.collection().
As a first parameter you have to pass the name of the collection defined in your DbContext.
If you are using a custom context name you can access the collection by prefixing it with the name separated with a dot: default.entries for example
You can simply query all data of a collection.
Using the method .values() will create a subscription on the server and the server will notify the client if something has changed.
\f:(typescript:demo.component.ts) export class DemoComponent implements OnInit {\n \tvalues$: Observable<Entry[]>;\n\n \tconstructor(private db: SapphireDb) { }\n\n \tngOnInit() {\n \t\tthis.values$ = this.db.collection<Entry>('entries').values();\n \t}\n } \f:(csharp:DemoContext.cs) public class DemoContext : SapphireDbContext\n {\n \tpublic DemoContext(DbContextOptions<DemoContext> options, SapphireDatabaseNotifier notifier) : base(options, notifier)\n \t{\n \t}\n\n \tpublic DbSet<DemoEntry> Entries { get; set; }\n } \f:(csharp:DemoEntry.cs) public class DemoEntry\n {\n \t[Key]\n \tpublic int Id { get; set; }\n\n \tpublic string Content { get; set; }\n }
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If you only want to get the data once without updates use .snapshot()
\f:(typescript:demo.component.ts) export class DemoComponent implements OnInit {\n \tvalues$: Observable<Entry[]>;\n\n \tconstructor(private db: SapphireDb) { }\n\n \tngOnInit() {\n \t\tthis.values$ = this.db.collection<Entry>('entries').snapshot();\n \t}\n }
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