Register an entity store that contains data about fruit:

List all "fruit" entities:

Look up the color of a banana:

Add data of an additional fruit:

Find the entity store that is accessed when retrieving data of the "fruit" entity type:

List all registered entity stores:

Unregister the "fruit" entity store:

Register an SQL-based EntityStore:

During assignments, separate entity stores are created for each new entity type:

To direct data into the same entity store, register one store containing both types before making assignments:

Referencing any of the types is enough to unregister the whole entity store:

Register an entity store that contains two types:

Register another store that shadows the type "t2":

Now the entity Entity["t2","f"] refers to the entity in the newly registered store:

Unregistering type "t2" will restore the previous result:

Unregister type "t1":

When dealing with external databases, one might encounter a database where the primary key was not set for some tables:

When this happens, EntityStore will emit a message. This means that some functionality involving single entities will be disabled:

But EntityValue will generally keep working:

The only way around this problem is to set the primary key constraint in the external database.