Basics: Database connection
sq's .Fetch() and .Exec() accept any database connection matching this interface
type DB interface {
Query(query string, args ...interface{}) (*sql.Rows, error)
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
Exec(query string, args ...interface{}) (sql.Result, error)
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
}
This means you can use database/sql and sqlx's connections out of the box.