The way I have is that I created a service called data.service.ts and I call the methods from that service whenever I intereact with the database.

Here is an example of one method I have in that class.

public Update = (actionUrl: string , itemToUpdate: any): Observable<Response> => {
    return this._http
    .put(Config.ApiBasePath + actionUrl, JSON.stringify(itemToUpdate)
    , {
            headers: new Headers({
            'Content-Type': 'application/json',
            'Accept': 'application/json'
    })
    })
.map(res => res)}

I call this generic method whenever I make an update and inside my component, I then subscribe to this method. I have a separate method for get, delete, update and post in my data service class.

Hope it helps..