Initialization Callback

In order to hook into Floor's database initialization process, Callback should be used. It allows the invocation of three separate callbacks which are triggered when the database has been

• initialized for the first time (onCreate).
• opened (onOpen).
• upgraded (onUpgrade).

Each callback is optional.

Their usage can be seen in the following snippet.

final callback = Callback(
   onCreate: (database, version) { /* database has been created */ },
   onOpen: (database) { /* database has been opened */ },
   onUpgrade: (database, startVersion, endVersion) { /* database has been upgraded */ },
);

final database = await $FloorAppDatabase
    .databaseBuilder('app_database.db')
    .addCallback(callback)
    .build();