granicus.if.org Git - postgresql/blob - src/bin/scripts/dropdb.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * dropdb
   4  *
   5  * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
   6  * Portions Copyright (c) 1994, Regents of the University of California
   7  *
   8  * src/bin/scripts/dropdb.c
   9  *
  10  *-------------------------------------------------------------------------
  11  */
  12
  13 #include "postgres_fe.h"
  14 #include "common.h"
  15 #include "fe_utils/string_utils.h"
  16
  17
  18 static void help(const char *progname);
  19
  20
  21 int
  22 main(int argc, char *argv[])
  23 {
  24         static int      if_exists = 0;
  25
  26         static struct option long_options[] = {
  27                 {"host", required_argument, NULL, 'h'},
  28                 {"port", required_argument, NULL, 'p'},
  29                 {"username", required_argument, NULL, 'U'},
  30                 {"no-password", no_argument, NULL, 'w'},
  31                 {"password", no_argument, NULL, 'W'},
  32                 {"echo", no_argument, NULL, 'e'},
  33                 {"interactive", no_argument, NULL, 'i'},
  34                 {"if-exists", no_argument, &if_exists, 1},
  35                 {"maintenance-db", required_argument, NULL, 2},
  36                 {NULL, 0, NULL, 0}
  37         };
  38
  39         const char *progname;
  40         int                     optindex;
  41         int                     c;
  42
  43         char       *dbname = NULL;
  44         char       *maintenance_db = NULL;
  45         char       *host = NULL;
  46         char       *port = NULL;
  47         char       *username = NULL;
  48         enum trivalue prompt_password = TRI_DEFAULT;
  49         bool            echo = false;
  50         bool            interactive = false;
  51
  52         PQExpBufferData sql;
  53
  54         PGconn     *conn;
  55         PGresult   *result;
  56
  57         progname = get_progname(argv[0]);
  58         set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
  59
  60         handle_help_version_opts(argc, argv, "dropdb", help);
  61
  62         while ((c = getopt_long(argc, argv, "h:p:U:wWei", long_options, &optindex)) != -1)
  63         {
  64                 switch (c)
  65                 {
  66                         case 'h':
  67                                 host = pg_strdup(optarg);
  68                                 break;
  69                         case 'p':
  70                                 port = pg_strdup(optarg);
  71                                 break;
  72                         case 'U':
  73                                 username = pg_strdup(optarg);
  74                                 break;
  75                         case 'w':
  76                                 prompt_password = TRI_NO;
  77                                 break;
  78                         case 'W':
  79                                 prompt_password = TRI_YES;
  80                                 break;
  81                         case 'e':
  82                                 echo = true;
  83                                 break;
  84                         case 'i':
  85                                 interactive = true;
  86                                 break;
  87                         case 0:
  88                                 /* this covers the long options */
  89                                 break;
  90                         case 2:
  91                                 maintenance_db = pg_strdup(optarg);
  92                                 break;
  93                         default:
  94                                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
  95                                 exit(1);
  96                 }
  97         }
  98
  99         switch (argc - optind)
 100         {
 101                 case 0:
 102                         fprintf(stderr, _("%s: missing required argument database name\n"), progname);
 103                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 104                         exit(1);
 105                 case 1:
 106                         dbname = argv[optind];
 107                         break;
 108                 default:
 109                         fprintf(stderr, _("%s: too many command-line arguments (first is \"%s\")\n"),
 110                                         progname, argv[optind + 1]);
 111                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 112                         exit(1);
 113         }
 114
 115         if (interactive)
 116         {
 117                 printf(_("Database \"%s\" will be permanently removed.\n"), dbname);
 118                 if (!yesno_prompt("Are you sure?"))
 119                         exit(0);
 120         }
 121
 122         initPQExpBuffer(&sql);
 123
 124         appendPQExpBuffer(&sql, "DROP DATABASE %s%s;",
 125                                           (if_exists ? "IF EXISTS " : ""), fmtId(dbname));
 126
 127         /* Avoid trying to drop postgres db while we are connected to it. */
 128         if (maintenance_db == NULL && strcmp(dbname, "postgres") == 0)
 129                 maintenance_db = "template1";
 130
 131         conn = connectMaintenanceDatabase(maintenance_db,
 132                                                                           host, port, username, prompt_password,
 133                                                                           progname, echo);
 134
 135         if (echo)
 136                 printf("%s\n", sql.data);
 137         result = PQexec(conn, sql.data);
 138         if (PQresultStatus(result) != PGRES_COMMAND_OK)
 139         {
 140                 fprintf(stderr, _("%s: database removal failed: %s"),
 141                                 progname, PQerrorMessage(conn));
 142                 PQfinish(conn);
 143                 exit(1);
 144         }
 145
 146         PQclear(result);
 147         PQfinish(conn);
 148         exit(0);
 149 }
 150
 151
 152 static void
 153 help(const char *progname)
 154 {
 155         printf(_("%s removes a PostgreSQL database.\n\n"), progname);
 156         printf(_("Usage:\n"));
 157         printf(_("  %s [OPTION]... DBNAME\n"), progname);
 158         printf(_("\nOptions:\n"));
 159         printf(_("  -e, --echo                show the commands being sent to the server\n"));
 160         printf(_("  -i, --interactive         prompt before deleting anything\n"));
 161         printf(_("  -V, --version             output version information, then exit\n"));
 162         printf(_("  --if-exists               don't report error if database doesn't exist\n"));
 163         printf(_("  -?, --help                show this help, then exit\n"));
 164         printf(_("\nConnection options:\n"));
 165         printf(_("  -h, --host=HOSTNAME       database server host or socket directory\n"));
 166         printf(_("  -p, --port=PORT           database server port\n"));
 167         printf(_("  -U, --username=USERNAME   user name to connect as\n"));
 168         printf(_("  -w, --no-password         never prompt for password\n"));
 169         printf(_("  -W, --password            force password prompt\n"));
 170         printf(_("  --maintenance-db=DBNAME   alternate maintenance database\n"));
 171         printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
 172 }