casting

type Author struct {
	AuthorID  *int32  `json:"author_id"`
	FirstName *string `json:"first_name"`
	LastName  *string `json:"last_name"`
	Suffix    *string `json:"suffix"`
}

type Book struct {
	BookID   *int32  `json:"book_id"`
	Title    *string `json:"title"`
	AuthorID *int32  `json:"author_id"`
}

type DBQuerier struct {
	// contains filtered or unexported fields
}

type FindBooksRow struct {
	A *Author `json:"a"`
	B *Book   `json:"b"`
}

type Querier interface {
	// FindBooks finds all books.
	FindBooks(ctx context.Context) ([]FindBooksRow, error)

	// InsertAuthor inserts an author by name and returns the ID.
	InsertAuthor(ctx context.Context, firstName string, lastName string) (int32, error)

	// InsertBook inserts a book.
	InsertBook(ctx context.Context, title string) (int32, error)

	// AssignAuthor assigns an author to a book.
	AssignAuthor(ctx context.Context, authorID int32, bookID int32) (pgconn.CommandTag, error)
}

type RegisterConn interface {
	LoadType(ctx context.Context, typeName string) (*pgtype.Type, error)
	TypeMap() *pgtype.Map
}