Azure Cosmos DB

Dapr doesn’t transform state values while saving and retrieving states. Dapr requires all state store implementations to abide by a certain key format scheme (see the state management spec. You can directly interact with the underlying store to manipulate the state data, such as:

• Querying states.
• Creating aggregated views.
• Making backups.

Connect to Azure Cosmos DB

To connect to your Cosmos DB instance, you can either:

• Use the Data Explorer on Azure Management Portal.
• Use various SDKs and tools.

List keys by App ID

To get all state keys associated with application “myapp”, use the query:

SELECT * FROM states WHERE CONTAINS(states.id, 'myapp||')

The above query returns all documents with an id containing “myapp-”, which is the prefix of the state keys.

Get specific state data

To get the state data by a key “balance” for the application “myapp”, use the query:

SELECT * FROM states WHERE states.id = 'myapp||balance'

Read the value field of the returned document. To get the state version/ETag, use the command:

SELECT states._etag FROM states WHERE states.id = 'myapp||balance'

Read actor state

To get all the state keys associated with an actor with the instance ID “leroy” of actor type “cat” belonging to the application with ID “mypets”, use the command:

SELECT * FROM states WHERE CONTAINS(states.id, 'mypets||cat||leroy||')

And to get a specific actor state such as “food”, use the command:

SELECT * FROM states WHERE states.id = 'mypets||cat||leroy||food'