DAOProduct factory of product storage ! Al implementar este factory, los metodos NewPsqlProduct y NewMySQLProduct los volvemos no exportados.

New crea una nueva instancia de la base de datos.

NewPsqlInvoice returns a new pointer of PsqlInvoice.

NewPsqlInvoiceHeader return a new pointer of PsqlInvoiceHeader (builder function).

NewPsqlInvoiceItem return a new pointer of PsqlInvoiceItem (builder function).

* Pool returns a unique instance of the database connection.

Drivers.

Drivers.

PsqlInvoice used for work with postgres - invoice.

PsqlInvoiceHeader used for work with postgres - invoiceheader.

PsqlInvoiceItem used for work with postgres - invoiceitem.

Driver de storage.