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/*-------------------------------------------------------------------------
*
* droplang
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/bin/scripts/droplang.c,v 1.2 2003/05/14 03:26:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "common.h"
#include "print.h"
static void help(const char *progname);
int
main(int argc, char *argv[])
{
static struct option long_options[] = {
{"list", no_argument, NULL, 'l'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"username", required_argument, NULL, 'U'},
{"password", no_argument, NULL, 'W'},
{"dbname", required_argument, NULL, 'd'},
{"echo", no_argument, NULL, 'e'},
{NULL, 0, NULL, 0}
};
char *progname;
int optindex;
int c;
bool listlangs = false;
const char *dbname = NULL;
char *host = NULL;
char *port = NULL;
char *username = NULL;
bool password = false;
bool echo = false;
char *langname = NULL;
char *p;
char *lanplcallfoid;
char *handler;
bool keephandler;
PQExpBufferData sql;
PGconn *conn;
PGresult *result;
progname = get_progname(argv[0]);
init_nls();
handle_help_version_opts(argc, argv, "droplang", help);
while ((c = getopt_long(argc, argv, "lh:p:U:Wd:e", long_options, &optindex)) != -1)
{
switch (c)
{
case 'l':
listlangs = true;
break;
case 'h':
host = optarg;
break;
case 'p':
port = optarg;
break;
case 'U':
username = optarg;
break;
case 'W':
password = true;
break;
case 'd':
dbname = optarg;
break;
case 'e':
echo = true;
break;
default:
fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
exit(1);
}
}
if (argc - optind > 0)
{
if (listlangs)
dbname = argv[optind++];
else
{
langname = argv[optind++];
if (argc - optind > 0)
dbname = argv[optind++];
}
}
if (argc - optind > 0)
{
fprintf(stderr, _("%s: too many command line options (first is '%s')\n"),
progname, argv[optind]);
fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
exit(1);
}
if (dbname == NULL)
{
if (getenv("PGDATABASE"))
dbname = getenv("PGDATABASE");
else if (getenv("PGUSER"))
dbname = getenv("PGUSER");
else
dbname = get_user_name(progname);
}
initPQExpBuffer(&sql);
/*
* List option
*/
if (listlangs)
{
printQueryOpt popt;
conn = connectDatabase(dbname, host, port, username, password, progname);
printfPQExpBuffer(&sql, "SELECT lanname as \"%s\", (CASE WHEN lanpltrusted THEN '%s' ELSE '%s' END) as \"%s\" FROM pg_language WHERE lanispl IS TRUE;", _("Name"), _("yes"), _("no"), _("Trusted?"));
result = executeQuery(conn, sql.data, progname, echo);
memset(&popt, 0, sizeof(popt));
popt.topt.format = PRINT_ALIGNED;
popt.topt.border = 1;
popt.topt.encoding = PQclientEncoding(conn);
popt.title = _("Procedural Languages");
printQuery(result, &popt, stdout);
PQfinish(conn);
exit(0);
}
if (langname == NULL)
{
fprintf(stderr, _("%s: missing required argument language name\n"), progname);
fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
exit(1);
}
for (p = langname; *p; p++)
if (*p >= 'A' && *p <= 'Z')
*p += ('a' - 'A');
conn = connectDatabase(dbname, host, port, username, password, progname);
/*
* Make sure the language is installed and find the OID of the handler function
*/
printfPQExpBuffer(&sql, "SELECT lanplcallfoid FROM pg_language WHERE lanname = '%s' AND lanispl;", langname);
result = executeQuery(conn, sql.data, progname, echo);
if (PQntuples(result) == 0)
{
PQfinish(conn);
fprintf(stderr, _("%s: language \"%s\" is not installed in database \"%s\"\n"),
progname, langname, dbname);
exit(1);
}
lanplcallfoid = PQgetvalue(result, 0, 0);
/* result not cleared! */
/*
* Check that there are no functions left defined in that language
*/
printfPQExpBuffer(&sql, "SELECT count(proname) FROM pg_proc P, pg_language L WHERE P.prolang = L.oid AND L.lanname = '%s';", langname);
result = executeQuery(conn, sql.data, progname, echo);
if (strcmp(PQgetvalue(result, 0, 0), "0")!=0)
{
PQfinish(conn);
fprintf(stderr,
_("%s: There are %s functions declared in language \"%s\". Language not removed.\n"),
progname, PQgetvalue(result, 0, 0), langname);
exit(1);
}
PQclear(result);
/*
* Check that the handler function isn't used by some other language
*/
printfPQExpBuffer(&sql, "SELECT count(*) FROM pg_language WHERE lanplcallfoid = %s AND lanname <> '%s';", lanplcallfoid, langname);
result = executeQuery(conn, sql.data, progname, echo);
if (strcmp(PQgetvalue(result, 0, 0), "0")==0)
keephandler = false;
else
keephandler = true;
PQclear(result);
/*
* Find the handler name
*/
if (!keephandler)
{
printfPQExpBuffer(&sql, "SELECT proname FROM pg_proc WHERE oid = %s;", lanplcallfoid);
result = executeQuery(conn, sql.data, progname, echo);
handler = PQgetvalue(result, 0, 0);
/* result not cleared! */
}
else
handler = NULL;
/*
* Drop the language
*/
printfPQExpBuffer(&sql, "DROP LANGUAGE \"%s\";\n", langname);
if (!keephandler)
appendPQExpBuffer(&sql, "DROP FUNCTION \"%s\" ();\n", handler);
if (echo)
printf("%s", sql.data);
result = PQexec(conn, sql.data);
if (PQresultStatus(result) != PGRES_COMMAND_OK)
{
fprintf(stderr, _("%s: language removal failed: %s"),
progname, PQerrorMessage(conn));
PQfinish(conn);
exit(1);
}
PQfinish(conn);
exit(0);
}
static void
help(const char *progname)
{
printf(_("%s removes a procedural language from a database.\n\n"), progname);
printf(_("Usage:\n"));
printf(_(" %s [OPTION]... LANGNAME [DBNAME]\n"), progname);
printf(_("\nOptions:\n"));
printf(_(" -d, --dbname=DBNAME database to install language in\n"));
printf(_(" -e, --echo show the commands being sent to the server\n"));
printf(_(" -l, --list show a list of currently installed languages\n"));
printf(_(" -h, --host=HOSTNAME database server host\n"));
printf(_(" -p, --port=PORT database server port\n"));
printf(_(" -U, --username=USERNAME user name to connect as\n"));
printf(_(" -W, --password prompt for password\n"));
printf(_(" --help show this help, then exit\n"));
printf(_(" --version output version information, then exit\n"));
printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
}
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