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digitalmars.D - Tango DeRailed,DeActive Nomen est Omen ?

reply Bjoern <nanali nospam-wanadoo.fr> writes:
Hi,
just a few ideas about DDBI, DeRailed ...
So, the Sendero folks gave up the idea of ORM, CORBA etc. instead :
back to the roots: named DDBI. A good chance to reactivate DDBI but
unfortunately the DDBI rowset discussion is  at a stand still so I'd 
like to add a few sugesstions.

Let us use Java like DAO and a D-ish RowSet instead of Active Record.
-----
DAO is IMO a very good choice in case that you want to have a db 
agnostic library.
The required pattern are very well known. (factory, etc.)

Implementing RowSet is difficult using traditional compiled languages 
like D, so I suggest to implement LISP like lists in D.
These Lists are able to contain any kind of data including other lists. 
('cause we just deal with void*)

Opinions ?

Bjoern

(Corba is indeed a bad choice in case that you have to deal with massive 
service requests)
Feb 29 2008
next sibling parent reply =?ISO-8859-15?Q?Julio_C=E9sar_Carrascal_Urquijo?= writes:
Bjoern wrote:
 Hi,
 just a few ideas about DDBI, DeRailed ...
 So, the Sendero folks gave up the idea of ORM, CORBA etc. instead :
 back to the roots: named DDBI. A good chance to reactivate DDBI but
 unfortunately the DDBI rowset discussion is  at a stand still so I'd 
 like to add a few sugesstions.
 
 Let us use Java like DAO and a D-ish RowSet instead of Active Record.
 -----
 DAO is IMO a very good choice in case that you want to have a db 
 agnostic library.
 The required pattern are very well known. (factory, etc.)
 
 Implementing RowSet is difficult using traditional compiled languages 
 like D, so I suggest to implement LISP like lists in D.
 These Lists are able to contain any kind of data including other lists. 
 ('cause we just deal with void*)
 
 Opinions ?
 
 Bjoern
 
 (Corba is indeed a bad choice in case that you have to deal with massive 
 service requests)

Hi. Seems interesting. Where is all this been discussed? (I don't want to comment without proper context.) -- Julio CÚsar Carrascal Urquijo http://jcesar.artelogico.com/
Feb 29 2008
parent Bjoern <nanali nospam-wanadoo.fr> writes:
Julio CÚsar Carrascal Urquijo schrieb:
 Bjoern wrote:
 Hi,
 just a few ideas about DDBI, DeRailed ...
 So, the Sendero folks gave up the idea of ORM, CORBA etc. instead :
 back to the roots: named DDBI. A good chance to reactivate DDBI but
 unfortunately the DDBI rowset discussion is  at a stand still so I'd 
 like to add a few sugesstions.

 Let us use Java like DAO and a D-ish RowSet instead of Active Record.
 -----
 DAO is IMO a very good choice in case that you want to have a db 
 agnostic library.
 The required pattern are very well known. (factory, etc.)

 Implementing RowSet is difficult using traditional compiled languages 
 like D, so I suggest to implement LISP like lists in D.
 These Lists are able to contain any kind of data including other 
 lists. ('cause we just deal with void*)

 Opinions ?

 Bjoern

 (Corba is indeed a bad choice in case that you have to deal with 
 massive service requests)

Hi. Seems interesting. Where is all this been discussed? (I don't want to comment without proper context.)

I guess it was Brad who wrote this article : May be you should read this first : http://www.dsource.org/projects/tango/wiki/DeActive To discuss : 1) Tango Talk http://www.dsource.org/projects/tango/forums 2) DDBI Forum at : http://www.dsource.org/forums/viewforum.php?f=60 3) Dr Dobbs article The Power of LISP for C Programmers - "Lisp like lists in C" http://www.ddj.com/cpp/199900573 Bjoern
Mar 01 2008
prev sibling parent reply =?ISO-8859-15?Q?Julio_C=E9sar_Carrascal_Urquijo?= writes:
OK, I've read most of what you suggested, and also found this post on 
the Sendero forum wich seems very interesting:

http://www.dsource.org/forums/viewtopic.php?t=3580


Bjoern wrote:
 Hi,
 just a few ideas about DDBI, DeRailed ...
 So, the Sendero folks gave up the idea of ORM, CORBA etc. instead :
 back to the roots: named DDBI. A good chance to reactivate DDBI but
 unfortunately the DDBI rowset discussion is  at a stand still so I'd 
 like to add a few sugesstions.
 
 Let us use Java like DAO and a D-ish RowSet instead of Active Record.
 -----
 DAO is IMO a very good choice in case that you want to have a db 
 agnostic library.
 The required pattern are very well known. (factory, etc.)

Yes, DAO is a very successful pattern and there's not much needed from the language to implement it. That seems like a good plan.
 Implementing RowSet is difficult using traditional compiled languages 
 like D, so I suggest to implement LISP like lists in D.
 These Lists are able to contain any kind of data including other lists. 
 ('cause we just deal with void*)
 
 Opinions ?

When you say "implement LISP like lists in D" are you suggesting adding LISP lists to the language or in a library? Because I think it a list of Variants as implemented on Tango would provide the same functionality.
 Bjoern
 
 (Corba is indeed a bad choice in case that you have to deal with massive 
 service requests)

Yea, Corba is too heavyweight to be used for database access. Though for intranet services would be a nice add-on. Just not needed right now. -- Julio CÚsar Carrascal Urquijo http://jcesar.artelogico.com/
Mar 01 2008
parent Bjoern <nanali nospam-wanadoo.fr> writes:
Hi Julio,
 OK, I've read most of what you suggested, and also found this post on 
 the Sendero forum wich seems very interesting:

 http://www.dsource.org/forums/viewtopic.php?t=3580

Oh, that's indeed interresting.
 When you say "implement LISP like lists in D" are you suggesting adding 
 LISP lists to the language or in a library? Because I think it a list of 
 Variants as implemented on Tango would provide the same functionality.

Lisp like list are able to contain other lists and that is afaik not doable using a list of variants. A snippet : module lisplist; alias void* POINTER; /** A CONS is a data structure that can construct lists. It consists of two cells, called the "car" cell and the "cdr" cell. A CONS is to symbolic processing what a binary digit is to numerical processing. By combining CONS we can form lists, binary trees, hierarchies, and an infinite number of other useful data structures. */ struct CONS // A CONS is two pointers { POINTER car; POINTER cdr; } alias CONS* LIST; // A LIST is a pointer to a CONS /** cpush (cons push) Adds a CONS to the head of a list modify the cdr cell of *z to point to *lst. Set lst to point to the CONS z and return a pointer to the CONS. */ LIST cpush(CONS *z, LIST *lst) { z.cdr = *lst; return *lst = z; } --------------- You can imagine that this datatype is very flexible. The idea is to use this type to implement "RowSet". As said it is just an idea, or inspiration if you like, may be not worth the effort but I'd like to give it a try. I guess I will add some more functionalty to the snippet this afternoon. pop, cpop, reverse, merge and publish it using this forum-thread. Bjoern
Mar 02 2008