Saving Data on Android

autocomplete
, to easily connect to 
entities
 and their 
property definitions
.
•
@Transaction
 tells Room that the following SQL statements should be executed 
in a 
single transaction
.
•
@Delete
 allows you to automatically create 
DELETE FROM
 queries, but it requires 
a parameter to be removed; e.g., a 
Question
 object.
•
@Update
 updates a record in the database 
if it already exists
, or omits the 
changes, if it doesn't, leaving the database 
unchanged
.
• Writing tests with 
Espresso
 is a good way to see if your database code works 
properly.
• You can run Espresso tests, 
without manually going through the app
, in less 
than a few seconds.
• Inserting the data and reading from the databse in Espresso is safe, because you 
can work with an 
in-memory
 version of the database.
• In-memory databases