Hello! :)
(Sorry for my english. But if i wrote in portuguese, you wouldn't
understand nothing. :])
I found it's the right place to post this. I'm a newcomer in these
lists. I hope i did it right. :]
<BOREDOM>
When i started using SQL, i started with mSQL. I developed a lot
of useful apps for me and my job with C, mainly because i loved it's
elegant, simple api. But for a large project i'm doing in these days, i
thought is was not enough, because it felt a lot of features i started to
need, like security and subselects. (and it's not free :))
So after looking at the options, choose to start again with
postgres. It offered everything that i needed, and the documentation is
really good (remember me to thank the one who wrote'em).
But for my little apps, i needed to start porting them to libpq.
After looking at pq's syntax, i found it was better to write a bridge
between the mSQL api and libpq. I found that rewriting the libmsql.a
routines that calls libpq would made things much easier. I guess the
results are quite good right now.
</BOREDOM>
Ok. Lets' summarize it:
mpgsql.c is the bridge. Acting as a wrapper, it's really good,
since i could run mSQL. But it's not accurate. Some highlights:
CONS:
* It's not well documented
(this post is it's first documentation attempt, in fact);
* It doesn't handle field types correctly. I plan to fix it,
if people start doing feedbacks;
* It's limited to 10 simultaneous connections. I plan to enhance
this, i'm just figuring out;
* I'd like to make it reentrant/thread safe, although i don't
think this could be done without changing the API structure;
* Error Management should be better. This is my first priority
now;
* Some calls are just empty implementations.
PROS:
* the mSQL Monitor runs Okay. :]
* It's really cool. :)
* Make mSQL-made applications compatible with postgresql just by
changing link options.
* Uses postgreSQL. :]
* the mSQL API it's far easier to use and understand than libpq.
Consider this example:
#include "msql.h"
void main(int argc, char **argv, char **envp) {
int sid;
sid = msqlConnect(NULL); /* Connects via unix socket */
if (sid >= 0) {
m_result *rlt;
m_row *row;
msqlSelectDB(sid, "hosts");
if (msqlQuery(sid, "select host_id from hosts")) {
rlt = msqlStoreResult();
while (row = (m_row*)msqlFetchRow(rlt))
printf("hostid: %s\n", row[0]);
msqlFreeResult(rlt);
}
msqlClose(sid);
}
}
I enclose mpgsql.c inside. I'd like to maintain it, and (maybe, am
i dreaming) make it as part of the pgsql distribution. I guess it doesn't
depends on me, but mainly on it's acceptance by its users.
Hm... i forgot: you'll need a msql.h copy, since it's copyrighted
by Hughes Technologies Pty Ltd. If you haven't it yes, fetch one
from www.hughes.com.au.
I would like to catch users ideas. My next goal is to add better
error handling, and to make it better documented, and try to let relshow
run through it. :)
done. Aldrin Leal <aldrin@americasnet.com>
