Re: Persistence

frebe73@xxxxxxxxx a écrit :

In the OO world, people often claim that they use a SQL database "for
persistence". Mostly I think that the person making that claim actually
uses other features - like transactions, integrity, queries, etc - and
just use the word persistence because it's a buzzword.
But sometimes
there are people that claims that only the persistence features of a
SQL database should be used or that a SQL database does not provide any
other features but persistence.

What are the opinitions at comp.object?

Well, I can only speak for myself...

1. A SQL database provides many other features but persistence and they
should be used.

Indeed. Else why use a SQL database ???

The use of the word persistence is just used in a
routine manner and is not a correct description of what we use a SQL
database for.

Part of the problem is IMHO with the definition(s) of "persistance".

From what I understood, in a purely OO world (like a Smalltalk
environnement), "persistance" is about saving the *whole*
environnement state (which includes all existing objects, but also all
classes definitions etc). It's obvious that the common use of a SQL
DBMS from a program written with a file-based language (vs image-based
à la Smalltalk) has very few to do with this definition...

2. A SQL database provide many other features but persistence, but the
persistence feature is the only thing that should be used.

Why use a SQL database then ?

3. A SQL database does only provide persistence features.

no comment.

.

Relevant Pages

  • Re: Persistence
    ... A SQL database is obviously not the right tool for doing that. ... If I get you right, when you talk about persistence, you don't talk ... If you have such features ... There is no direct support of object storage and subsequent ...
    (comp.object)
  • Re: Persistence
    ... If you have such features ... Persistence is strictly about object IO. ... The relational model has nothing to do with disk storage. ...
    (comp.object)
  • Re: SQL
    ... persistence is one of MANY features of a DB. ... > or less) to the relational model, and and it does so in a persistent ... >>> databases. ...
    (comp.object)
  • Re: Persistence
    ... If you have such features ... Persistence is strictly about object IO. ... There is no direct support of object storage and subsequent ... instantiation of objects from disk storage. ...
    (comp.object)
  • Persistence
    ... uses other features - like transactions, integrity, queries, etc - and ... just use the word persistence because it's a buzzword. ... SQL database should be used or that a SQL database does not provide any ...
    (comp.object)