https://github.com/salva/plswipl
PL/SWI-Prolog - SWI-Prolog as a PostgreSQL Procedural Language
https://github.com/salva/plswipl
Last synced: about 2 months ago
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PL/SWI-Prolog - SWI-Prolog as a PostgreSQL Procedural Language
- Host: GitHub
- URL: https://github.com/salva/plswipl
- Owner: salva
- License: mit
- Created: 2016-03-06T23:18:42.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2016-03-31T15:46:30.000Z (about 9 years ago)
- Last Synced: 2023-03-10T19:41:09.264Z (over 2 years ago)
- Language: C
- Size: 62.5 KB
- Stars: 9
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# PL/SWI-Prolog
Use [SWI-Prolog](http://www.swi-prolog.org/) as a Procedural Language
inside [PostgreSQL](http://www.postgresql.org/)!
## Status
This is still a work in progress. It just barely works!
## Installation
$ make
$ sudo make install
Note that PostgreSQL development utilities and header files are required.
## Example
See the [example.prolog](./example.prolog) file which contains the following predicate definition:
```prolog
break_chars(String, Char) :-
atom_chars(String, Chars),
member(Char, Chars).
```
From `psql` shell as superuser:
create extension plswipl;
CREATE EXTENSION
salva=# create or replace function break_chars(text) returns setof text
as $$"/home/salva/g/pg/plswipl/example.prolog"$$ language PLSWIPL;
CREATE FUNCTION
salva=# select break_chars('all the letters');
break_chars
-------------
a
l
l
t
h
e
l
e
t
t
e
r
s
(15 rows)
salva=#
## Todo
- Investigate how to convert data from/to the Prolog side correctly.
- Add support for more data types, specifically arrays and json(b?)
- Learn how memory handling works under Pg and take advantage of it (**DONE!**)
- Add support for SPI
- Add support for doing FDW in Prolog?
- Store Prolog modules inside the database.
- Add trusted version for non superusers.
- Learn how a procedural language interactuates with having more than
one schema or changing the session user.
- Fix this alarm exceptions thing.
- Investigate higher level approaches to Prolog/SQL interaction.
- Investigate how to use Prolog to provide a Datalog (or similar)
interface to Pg.
## Focus
My aim is getting PL/SWI-Prolog to be a correct, flexible
and powerful Procedural Language backend.
At this point, structured, flexible and clear code is the most important
thing.
Resist to optimize if that means making the code more complex.
## Collaborating
Collaborations welcome! Just fork the project and start submiting pull requests!
## License
The PL/SWI-Prolog extension is distributed under the MIT license. See
the LICENSE file.