# Quick tour

This is a quick tour into the basic operations with EventStoreDb. We will look at creating a connection, writing an event and reading an event.

# Requirements

These examples have the following requirements:

# Setup the certificates and running the server

To run the EventStoreDB, create a new file called docker-compose.yml and copy the following contents into it.

version: '3'
services:
  eventstore:
    image: docker.pkg.github.com/eventstore/eventstore/eventstore:20.6.1-buster-slim
    environment:
      - EVENTSTORE_INSECURE=true
      - EVENTSTORE_ENABLE_ATOM_PUB_OVER_HTTP=true
    ports:
      - 2113:2113

Then run the command.

docker-compose up

This will launch a new instance of the EventStoreDb server .

# Creating a connection

Create a new console application.

The following example shows the simplest way to create a connection to EventStoreDb on your local machine.

var settings = new EventStoreClientSettings {
	ConnectivitySettings = {
		Address = new Uri("http://localhost:2113")
	}
};

var client = new EventStoreClient(settings);

EventStoreDB runs secure by default. To avoid setting up any certificates we need to override the HttpClientHandler to tell it to trust all certificates.

TIP

By default, the server listens to port 2113 for requests.

# Writing an event

Writing an event to the database involves two stages.

Firstly you have to construct a new EventData that contains a unique id, an event type, and a byte array containing the event data. Usually this is represented by json but can take any format.

Secondly you have to append that EventData to a stream. Making sure to specify the stream name, the expected state of the stream and then the data.

var eventData = new EventData(
	Uuid.NewUuid(),
	"some-event",
	Encoding.UTF8.GetBytes("{\"id\": \"1\" \"value\": \"some value\"}")
);

await client.AppendToStreamAsync(
	"some-stream",
	StreamState.NoStream,
	new List<EventData> {
		eventData
	});

# Reading an event

You can read events from a stream in both directions. In this case we are reading the some-stream forwards from the start. We are reading a single event.

This provides an IAsyncEnumerable, which you can then iterate on.

var events = client.ReadStreamAsync(
	Direction.Forwards,
	"some-stream",
	StreamPosition.Start,
	1);

await foreach (var @event in events) {
	Console.WriteLine(Encoding.UTF8.GetString(@event.Event.Data.Span));
}