Component's dependencies separator

At first, register a factory of *sql.DB as component.

import "github.com/koron-go/materialize" materialize.MustAdd(func() (*sql.DB, error) { return sql.Open(os.Getenv("DB_DRIVER"), os.Getenv("DB_DATASOURCE_NAME")) })

Then, obtain a *sql.DB instance when you use. The instance will be created automatically, and managed as singleton.

var db *sql.DB err := materialize.Materialize(&db) if err != nil { return err } // TODO: let's work with "db".

All materiazlied instances which implement Close() error or Close() method, will be closed when you call materialize.CloseAll().

materialize.CloseAll()