From: "Aldrin L." <aldrin@americasnet.com>
Subject: [INTERFACES] mSQL Compatibility Library (fwd)
This commit is contained in:
Marc G. Fournier
parent
45878915a8
commit
d1c5021c67
85
contrib/mSQL-interface/README
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85
contrib/mSQL-interface/README
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Hello! :)
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(Sorry for my english. But if i wrote in portuguese, you wouldn't
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understand nothing. :])
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I found it's the right place to post this. I'm a newcomer in these
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lists. I hope i did it right. :]
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<BOREDOM>
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When i started using SQL, i started with mSQL. I developed a lot
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of useful apps for me and my job with C, mainly because i loved it's
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elegant, simple api. But for a large project i'm doing in these days, i
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thought is was not enough, because it felt a lot of features i started to
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need, like security and subselects. (and it's not free :))
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So after looking at the options, choose to start again with
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postgres. It offered everything that i needed, and the documentation is
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really good (remember me to thank the one who wrote'em).
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But for my little apps, i needed to start porting them to libpq.
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After looking at pq's syntax, i found it was better to write a bridge
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between the mSQL api and libpq. I found that rewriting the libmsql.a
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routines that calls libpq would made things much easier. I guess the
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results are quite good right now.
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</BOREDOM>
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Ok. Lets' summarize it:
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mpgsql.c is the bridge. Acting as a wrapper, it's really good,
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since i could run mSQL. But it's not accurate. Some highlights:
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CONS:
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* It's not well documented
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(this post is it's first documentation attempt, in fact);
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* It doesn't handle field types correctly. I plan to fix it,
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if people start doing feedbacks;
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* It's limited to 10 simultaneous connections. I plan to enhance
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this, i'm just figuring out;
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* I'd like to make it reentrant/thread safe, although i don't
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think this could be done without changing the API structure;
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* Error Management should be better. This is my first priority
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now;
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* Some calls are just empty implementations.
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PROS:
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* the mSQL Monitor runs Okay. :]
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* It's really cool. :)
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* Make mSQL-made applications compatible with postgresql just by
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changing link options.
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* Uses postgreSQL. :]
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* the mSQL API it's far easier to use and understand than libpq.
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Consider this example:
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#include "msql.h"
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void main(int argc, char **argv, char **envp) {
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int sid;
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sid = msqlConnect(NULL); /* Connects via unix socket */
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if (sid >= 0) {
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m_result *rlt;
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m_row *row;
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msqlSelectDB(sid, "hosts");
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if (msqlQuery(sid, "select host_id from hosts")) {
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rlt = msqlStoreResult();
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while (row = (m_row*)msqlFetchRow(rlt))
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printf("hostid: %s\n", row[0]);
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msqlFreeResult(rlt);
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}
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msqlClose(sid);
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}
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}
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I enclose mpgsql.c inside. I'd like to maintain it, and (maybe, am
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i dreaming) make it as part of the pgsql distribution. I guess it doesn't
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depends on me, but mainly on it's acceptance by its users.
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Hm... i forgot: you'll need a msql.h copy, since it's copyrighted
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by Hughes Technologies Pty Ltd. If you haven't it yes, fetch one
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from www.hughes.com.au.
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I would like to catch users ideas. My next goal is to add better
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error handling, and to make it better documented, and try to let relshow
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run through it. :)
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done. Aldrin Leal <aldrin@americasnet.com>
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275
contrib/mSQL-interface/mpgsql.c
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275
contrib/mSQL-interface/mpgsql.c
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#include <time.h>
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#include <string.h>
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#include <stdlib.h>
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#include "msql.h"
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#include "libpq-fe.h"
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#define HNDMAX 10
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PGconn *PGh[HNDMAX] = {
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NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL
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};
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#define E_NOHANDLERS 0
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char *msqlErrors[] = {
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"Out of database handlers."
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};
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char msqlErrMsg[BUFSIZ], *tfrom = "dunno";
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PGresult *queryres = NULL;
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int msqlConnect (char *host) {
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int count;
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for (count = 0; count < HNDMAX; count++)
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if (PGh[count] == NULL) break;
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if (count == HNDMAX) {
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strncpy(msqlErrMsg, msqlErrors[E_NOHANDLERS], BUFSIZ);
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return -1;
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}
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PGh[count] = malloc(sizeof (PGconn));
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PGh[count]->pghost = host ? strdup(host) : NULL;
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return count;
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}
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int msqlSelectDB(int handle, char *dbname) {
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char *options = calloc(1, BUFSIZ);
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char *e = getenv("PG_OPTIONS");
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if (e == NULL)
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e = "";
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if (PGh[handle]->pghost) {
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strcat(options, "host=");
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strncat(options, PGh[handle]->pghost, BUFSIZ);
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strncat(options, " ", BUFSIZ);
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free(PGh[handle]->pghost);
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PGh[handle]->pghost = NULL;
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}
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strncat(options, "dbname=", BUFSIZ);
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strncat(options, dbname, BUFSIZ);
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strncat(options, " ", BUFSIZ);
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strncat(options, e, BUFSIZ);
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free(PGh[handle]);
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PGh[handle] = PQconnectdb(options);
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free(options);
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strncpy(msqlErrMsg, PQerrorMessage(PGh[handle]), BUFSIZ);
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return (PQstatus(PGh[handle]) == CONNECTION_BAD ? -1 : 0);
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}
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int msqlQuery(int handle, char *query) {
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char *tq = strdup(query);
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char *p = tq;
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PGresult *res;
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PGconn *conn = PGh[handle];
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ExecStatusType rcode;
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res = PQexec(conn, p);
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rcode = PQresultStatus(res);
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if (rcode == PGRES_TUPLES_OK) {
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queryres = res;
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return PQntuples(res);
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} else if (rcode == PGRES_FATAL_ERROR || rcode == PGRES_NONFATAL_ERROR) {
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PQclear(res);
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queryres = NULL;
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return -1;
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} else {
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PQclear(res);
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queryres = NULL;
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return 0;
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}
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}
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int msqlCreateDB (int a, char*b) {
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char tbuf[BUFSIZ];
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sprintf(tbuf, "create database %s", b);
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return msqlQuery(a, tbuf) >= 0 ? 0 : -1;
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}
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int msqlDropDB (int a, char* b) {
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char tbuf[BUFSIZ];
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sprintf(tbuf, "drop database %s", b);
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return msqlQuery(a, tbuf) >= 0 ? 0 : -1;
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}
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int msqlShutdown(int a) {
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}
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int msqlGetProtoInfo(void) {
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}
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int msqlReloadAcls(int a) {
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}
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char *msqlGetServerInfo(void) {
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}
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char *msqlGetHostInfo(void) {
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}
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char *msqlUnixTimeToDate(time_t date) {
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}
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char *msqlUnixTimeToTime(time_t time) {
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}
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void msqlClose(int a) {
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PQfinish(PGh[a]);
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PGh[a] = NULL;
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if (queryres) {
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free(queryres);
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queryres = NULL;
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}
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}
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void msqlDataSeek(m_result *result, int count) {
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int c;
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result->cursor = result->queryData;
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for (c = 1; c < count; c++)
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if (result->cursor->next)
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result->cursor = result->cursor->next;
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}
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void msqlFieldSeek(m_result *result, int count) {
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int c;
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result->fieldCursor = result->fieldData;
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for (c = 1; c < count; c++)
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if (result->fieldCursor->next)
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result->fieldCursor = result->fieldCursor->next;
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}
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void msqlFreeResult(m_result *result) {
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if (result) {
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/* Clears fields */
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free(result->fieldData);
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result->cursor = result->queryData;
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while (result->cursor) {
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int c;
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m_row m = result->cursor->data;
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for (c = 0; m[c]; c++)
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free(m[c]);
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result->cursor = result->cursor->next;
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}
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free(result->queryData);
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free(result);
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}
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}
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m_row msqlFetchRow(m_result *row) {
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m_data *r = row->cursor;
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if (r) {
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row->cursor = row->cursor->next;
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return (m_row)r->data;
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}
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return (m_row)NULL;
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}
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m_seq *msqlGetSequenceInfo(int a, char *b) {
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}
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m_field *msqlFetchField (m_result *mr) {
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m_field *m = (m_field*)mr->fieldCursor;
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if (m) {
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mr->fieldCursor = mr->fieldCursor->next;
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return m;
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}
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return NULL;
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}
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m_result *msqlListDBs(int a) {
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m_result *m;
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if (msqlQuery(a, "select datname from pg_database") > 0) {
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m = msqlStoreResult();
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return m;
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} else return NULL;
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}
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m_result *msqlListTables(int a) {
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m_result *m;
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char tbuf[BUFSIZ];
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sprintf(tbuf, "select relname from pg_class where relkind='r' and relowner=%d", getuid());
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if (msqlQuery(a, tbuf) > 0) {
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m = msqlStoreResult();
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return m;
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} else return NULL;
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}
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m_result *msqlListFields(int a, char *b) {
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}
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m_result *msqlListIndex(int a, char *b, char *c) {
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m_result *m;
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char tbuf[BUFSIZ];
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sprintf(tbuf, "select relname from pg_class where relkind='i' and relowner=%d", getuid());
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if (msqlQuery(a, tbuf) > 0) {
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m = msqlStoreResult();
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return m;
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} else return NULL;
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}
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m_result *msqlStoreResult(void) {
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if (queryres) {
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m_result *mr = malloc(sizeof(m_result));
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m_fdata *mf;
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m_data *md;
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int count;
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mr->queryData = mr->cursor = NULL;
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mr->numRows = PQntuples(queryres);
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mr->numFields = PQnfields(queryres);
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mf = calloc(PQnfields(queryres), sizeof(m_fdata));
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for (count = 0; count < PQnfields(queryres); count++) {
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(m_fdata*)(mf+count)->field.name = strdup(PQfname(queryres, count));
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(m_fdata*)(mf+count)->field.table = tfrom;
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(m_fdata*)(mf+count)->field.type = CHAR_TYPE;
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(m_fdata*)(mf+count)->field.length = PQfsize(queryres, count);
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(m_fdata*)(mf+count)->next = (m_fdata*)(mf+count+1);
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}
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(m_fdata*)(mf+count-1)->next = NULL;
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md = calloc(PQntuples(queryres), sizeof(m_data));
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for (count = 0; count < PQntuples(queryres); count++) {
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m_row rows = calloc(PQnfields(queryres)*sizeof(m_row)+1, 1);
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int c;
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for (c = 0; c < PQnfields(queryres); c++) {
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rows[c] = strdup(PQgetvalue(queryres, count, c));
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}
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(m_data*)(md+count)->data = rows;
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(m_data*)(md+count)->width = PQnfields(queryres);
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(m_data*)(md+count)->next = (m_data*)(md+count+1);
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}
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(m_data*)(md+count-1)->next = NULL;
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mr->queryData = mr->cursor = md;
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mr->fieldCursor = mr->fieldData = mf;
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return mr;
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} else return NULL;
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}
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time_t msqlDateToUnixTime(char *a) {
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}
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time_t msqlTimeToUnixTime(char *b) {
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}
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char *msql_tmpnam(void) {
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return tmpnam("/tmp/msql.XXXXXX");
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}
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int msqlLoadConfigFile(char *a) {
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}
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