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https://github.com/postgres/postgres.git
synced 2025-07-14 08:21:07 +03:00
Reimplement create and drop scripts in C, to reduce repetitive
connections, increase robustness, add NLS, and prepare for Windows port. (vacuumdb and clusterdb will follow later.)
This commit is contained in:
Peter Eisentraut
255
src/bin/scripts/droplang.c
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255
src/bin/scripts/droplang.c
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/*-------------------------------------------------------------------------
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*
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* droplang
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Header: /cvsroot/pgsql/src/bin/scripts/droplang.c,v 1.1 2003/03/18 22:19:47 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include "common.h"
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#include "print.h"
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static void help(const char *progname);
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int
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main(int argc, char *argv[])
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{
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static struct option long_options[] = {
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{"list", no_argument, NULL, 'l'},
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{"host", required_argument, NULL, 'h'},
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{"port", required_argument, NULL, 'p'},
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{"username", required_argument, NULL, 'U'},
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{"password", no_argument, NULL, 'W'},
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{"dbname", required_argument, NULL, 'd'},
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{"echo", no_argument, NULL, 'e'},
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{NULL, 0, NULL, 0}
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};
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char *progname;
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int optindex;
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int c;
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bool listlangs = false;
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const char *dbname = NULL;
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char *host = NULL;
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char *port = NULL;
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char *username = NULL;
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bool password = false;
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bool echo = false;
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char *langname = NULL;
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char *p;
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char *lanplcallfoid;
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char *handler;
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bool keephandler;
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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progname = get_progname(argv[0]);
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init_nls();
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handle_help_version_opts(argc, argv, "droplang", help);
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while ((c = getopt_long(argc, argv, "lh:p:U:Wd:e", long_options, &optindex)) != -1)
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{
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switch (c)
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{
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case 'l':
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listlangs = true;
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break;
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case 'h':
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host = optarg;
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break;
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case 'p':
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port = optarg;
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break;
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case 'U':
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username = optarg;
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break;
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case 'W':
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password = true;
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break;
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case 'd':
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dbname = optarg;
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break;
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case 'e':
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echo = true;
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break;
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default:
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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}
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if (argc - optind > 0)
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{
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if (listlangs)
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dbname = argv[optind++];
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else
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{
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langname = argv[optind++];
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if (argc - optind > 0)
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dbname = argv[optind++];
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}
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}
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if (argc - optind > 0)
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{
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fprintf(stderr, _("%s: too many command line options (first is '%s')\n"),
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progname, argv[optind]);
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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if (dbname == NULL)
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{
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if (getenv("PGDATABASE"))
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dbname = getenv("PGDATABASE");
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else if (getenv("PGUSER"))
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dbname = getenv("PGUSER");
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else
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dbname = get_user_name(progname);
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}
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initPQExpBuffer(&sql);
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/*
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* List option
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*/
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if (listlangs)
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{
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printQueryOpt popt;
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conn = connectDatabase(dbname, host, port, username, password, progname);
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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?"));
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result = executeQuery(conn, sql.data, progname, echo);
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memset(&popt, 0, sizeof(popt));
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popt.topt.format = PRINT_ALIGNED;
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popt.topt.border = 1;
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popt.topt.encoding = PQclientEncoding(conn);
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popt.title = _("Procedural Languages");
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printQuery(result, &popt, stdout);
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PQfinish(conn);
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exit(0);
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}
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if (langname == NULL)
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{
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fprintf(stderr, _("%s: missing required argument language name\n"), progname);
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fprintf(stderr, _("Try '%s --help' for more information.\n"), progname);
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exit(1);
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}
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for (p = langname; *p; p++)
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if (*p >= 'A' && *p <= 'Z')
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*p += ('a' - 'A');
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conn = connectDatabase(dbname, host, port, username, password, progname);
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/*
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* Make sure the language is installed and find the OID of the handler function
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*/
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printfPQExpBuffer(&sql, "SELECT lanplcallfoid FROM pg_language WHERE lanname = '%s' AND lanispl;", langname);
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result = executeQuery(conn, sql.data, progname, echo);
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if (PQntuples(result) == 0)
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{
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PQfinish(conn);
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fprintf(stderr, _("%s: language \"%s\" is not installed in database \"%s\"\n"),
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progname, langname, dbname);
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exit(1);
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}
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lanplcallfoid = PQgetvalue(result, 0, 0);
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/* result not cleared! */
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/*
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* Check that there are no functions left defined in that language
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*/
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printfPQExpBuffer(&sql, "SELECT count(proname) FROM pg_proc P, pg_language L WHERE P.prolang = L.oid AND L.lanname = '%s';", langname);
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result = executeQuery(conn, sql.data, progname, echo);
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if (strcmp(PQgetvalue(result, 0, 0), "0")!=0)
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{
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PQfinish(conn);
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fprintf(stderr,
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_("%s: There are %s functions declared in language \"%s\". Language not removed.\n"),
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progname, PQgetvalue(result, 0, 0), langname);
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exit(1);
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}
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PQclear(result);
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/*
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* Check that the handler function isn't used by some other language
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*/
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printfPQExpBuffer(&sql, "SELECT count(*) FROM pg_language WHERE lanplcallfoid = %s AND lanname <> '%s';", lanplcallfoid, langname);
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result = executeQuery(conn, sql.data, progname, echo);
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if (strcmp(PQgetvalue(result, 0, 0), "0")==0)
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keephandler = false;
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else
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keephandler = true;
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PQclear(result);
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/*
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* Find the handler name
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*/
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if (!keephandler)
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{
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printfPQExpBuffer(&sql, "SELECT proname FROM pg_proc WHERE oid = %s;", lanplcallfoid);
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result = executeQuery(conn, sql.data, progname, echo);
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handler = PQgetvalue(result, 0, 0);
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/* result not cleared! */
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}
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else
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handler = NULL;
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/*
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* Drop the language
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*/
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printfPQExpBuffer(&sql, "SET autocommit TO on;\n");
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appendPQExpBuffer(&sql, "DROP LANGUAGE \"%s\";\n", langname);
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if (!keephandler)
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appendPQExpBuffer(&sql, "DROP FUNCTION \"%s\" ();\n", handler);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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{
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fprintf(stderr, _("%s: language removal failed: %s"),
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progname, PQerrorMessage(conn));
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PQfinish(conn);
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exit(1);
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}
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PQfinish(conn);
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exit(0);
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}
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static void
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help(const char *progname)
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{
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printf(_("%s removes a procedural language from a database.\n\n"), progname);
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printf(_("Usage:\n"));
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printf(_(" %s [OPTION]... LANGNAME [DBNAME]\n"), progname);
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printf(_("\nOptions:\n"));
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printf(_(" -d, --dbname=DBNAME database to install language in\n"));
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printf(_(" -e, --echo show the commands being sent to the server\n"));
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printf(_(" -l, --list show a list of currently installed languages\n"));
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printf(_(" -h, --host=HOSTNAME database server host\n"));
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printf(_(" -p, --port=PORT database server port\n"));
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printf(_(" -U, --username=USERNAME user name to connect as\n"));
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printf(_(" -W, --password prompt for password\n"));
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printf(_(" --help show this help, then exit\n"));
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printf(_(" --version output version information, then exit\n"));
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printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
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}
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