> For the complete documentation index, see [llms.txt](https://dexiejs.typogram.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dexiejs.typogram.co/dbcore.md).

# DBCore

DBCore is a middleware-approach for Dexie that is superior to the hooks API. These are the reasons it is superior to the hooks API:

1. It allows the injector to perform asynchronous actions before forwarding a call.
2. It allows the injector to take actions both before and after the forwarded call.
3. It covers more use cases, such as when a transaction is created, allow custom index proxies etc.

From Dexie 3.0, all *runtime* calls to IndexedDB go via DBCore. The hooks API is still there and backward compatible with Dexie 2.0, but its internal implementation is now done using a DBCore middleware.

Not all access to IndexedDB go via DBCore still. Upgrade handling and opening the database are performed directly towards the provided IndexedDB implementation which defaults to *global*.indexedDB. In a future version, also these calls may become intercepted by a similar middleware architecture.

### Purpose

* Be able to invoke middleware
* Be performant and bulk-oriented

### Non-purpose

* Be a totally database-agnostic API

### Definition

```ts
export interface DBCore {
  stack: "dbcore";
  // Transaction and Object Store
  transaction(tables: string[], mode: 'readwrite' | 'readonly'): DBCoreTransaction;

  // Utility methods
  cmp(a: any, b: any) : number;
  readonly MIN_KEY: any;
  readonly MAX_KEY: any;
  readonly schema: DBCoreSchema;
  table(name: string): DBCoreTable;
}
```

See Dexie.use()

### See Also

* DBCoreTransaction
* DBCoreSchema
* DBCoreTable
* DBCoreQuery

### Example

* See Dexie.use()#example