Sistemas de Persistencia Orm
85
description
n el desarrollo de una aplicación suelen estar involucradas dos entidades diferentes, por una parte el código que mueve la aplicación y por otra los datos que se manejan. Con el tiempo estas dos entidades han evolucionado de manera diferente, y el acceso a los datos desde los programas se ha vuelto una tarea en ocasiones, complicada. Los sistemas de Mapeo Objeto-Relacional u ORM ayudan a combatir esta complicación.En un principio los programas accedían físicamente al disco para escribir los datos, algo que implicaba que el programa tuviese que implementar toda la lógica de una base de datos para permitir agregar, modificar o eliminar datos.Con el tiempo se han desarrollado lo que se conoce como sistemas de bases de datos relacionales, que permiten mantener entidades (Artículo, Ficha médica o Factura), sus respectivas relaciones (Una ficha médica corresponde a un solo paciente) y sus atributos (Una ficha médica contiene fecha de entrada, fecha de salida, síntomas… etc).
Transcript of Sistemas de Persistencia Orm
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