beforeOpen abstract method
A callbacks that runs after the database connection has been established, but before any other query is sent.
The query executor will wait for this future to complete before running
any other query. Queries running on the executor
are an exception to
this, they can be used to run migrations.
No matter how often QueryExecutor.ensureOpen is called, this method will
not be called more than once.
Implementation
Future<void> beforeOpen(QueryExecutor executor, OpeningDetails details);