Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * dropdb
4 : *
5 : * Portions Copyright (c) 1996-2026, 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 "common/logging.h"
16 : #include "fe_utils/option_utils.h"
17 : #include "fe_utils/string_utils.h"
18 :
19 :
20 : static void help(const char *progname);
21 :
22 :
23 : int
24 0 : main(int argc, char *argv[])
25 : {
26 : static int if_exists = 0;
27 :
28 : static struct option long_options[] = {
29 : {"host", required_argument, NULL, 'h'},
30 : {"port", required_argument, NULL, 'p'},
31 : {"username", required_argument, NULL, 'U'},
32 : {"no-password", no_argument, NULL, 'w'},
33 : {"password", no_argument, NULL, 'W'},
34 : {"echo", no_argument, NULL, 'e'},
35 : {"interactive", no_argument, NULL, 'i'},
36 : {"if-exists", no_argument, &if_exists, 1},
37 : {"maintenance-db", required_argument, NULL, 2},
38 : {"force", no_argument, NULL, 'f'},
39 : {NULL, 0, NULL, 0}
40 : };
41 :
42 0 : const char *progname;
43 0 : int optindex;
44 0 : int c;
45 :
46 0 : char *dbname = NULL;
47 0 : char *maintenance_db = NULL;
48 0 : char *host = NULL;
49 0 : char *port = NULL;
50 0 : char *username = NULL;
51 0 : enum trivalue prompt_password = TRI_DEFAULT;
52 0 : ConnParams cparams;
53 0 : bool echo = false;
54 0 : bool interactive = false;
55 0 : bool force = false;
56 :
57 0 : PQExpBufferData sql;
58 :
59 0 : PGconn *conn;
60 0 : PGresult *result;
61 :
62 0 : pg_logging_init(argv[0]);
63 0 : progname = get_progname(argv[0]);
64 0 : set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
65 :
66 0 : handle_help_version_opts(argc, argv, "dropdb", help);
67 :
68 0 : while ((c = getopt_long(argc, argv, "efh:ip:U:wW", long_options, &optindex)) != -1)
69 : {
70 0 : switch (c)
71 : {
72 : case 'e':
73 0 : echo = true;
74 0 : break;
75 : case 'f':
76 0 : force = true;
77 0 : break;
78 : case 'h':
79 0 : host = pg_strdup(optarg);
80 0 : break;
81 : case 'i':
82 0 : interactive = true;
83 0 : break;
84 : case 'p':
85 0 : port = pg_strdup(optarg);
86 0 : break;
87 : case 'U':
88 0 : username = pg_strdup(optarg);
89 0 : break;
90 : case 'w':
91 0 : prompt_password = TRI_NO;
92 0 : break;
93 : case 'W':
94 0 : prompt_password = TRI_YES;
95 0 : break;
96 : case 0:
97 : /* this covers the long options */
98 : break;
99 : case 2:
100 0 : maintenance_db = pg_strdup(optarg);
101 0 : break;
102 : default:
103 : /* getopt_long already emitted a complaint */
104 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
105 0 : exit(1);
106 : }
107 : }
108 :
109 0 : switch (argc - optind)
110 : {
111 : case 0:
112 0 : pg_log_error("missing required argument database name");
113 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
114 0 : exit(1);
115 : case 1:
116 0 : dbname = argv[optind];
117 0 : break;
118 : default:
119 0 : pg_log_error("too many command-line arguments (first is \"%s\")",
120 : argv[optind + 1]);
121 0 : pg_log_error_hint("Try \"%s --help\" for more information.", progname);
122 0 : exit(1);
123 : }
124 :
125 0 : if (interactive)
126 : {
127 0 : printf(_("Database \"%s\" will be permanently removed.\n"), dbname);
128 0 : if (!yesno_prompt("Are you sure?"))
129 0 : exit(0);
130 0 : }
131 :
132 : /* Avoid trying to drop postgres db while we are connected to it. */
133 0 : if (maintenance_db == NULL && strcmp(dbname, "postgres") == 0)
134 0 : maintenance_db = "template1";
135 :
136 0 : cparams.dbname = maintenance_db;
137 0 : cparams.pghost = host;
138 0 : cparams.pgport = port;
139 0 : cparams.pguser = username;
140 0 : cparams.prompt_password = prompt_password;
141 0 : cparams.override_dbname = NULL;
142 :
143 0 : conn = connectMaintenanceDatabase(&cparams, progname, echo);
144 :
145 0 : initPQExpBuffer(&sql);
146 0 : appendPQExpBuffer(&sql, "DROP DATABASE %s%s%s;",
147 0 : (if_exists ? "IF EXISTS " : ""),
148 0 : fmtIdEnc(dbname, PQclientEncoding(conn)),
149 0 : force ? " WITH (FORCE)" : "");
150 :
151 0 : if (echo)
152 0 : printf("%s\n", sql.data);
153 0 : result = PQexec(conn, sql.data);
154 0 : if (PQresultStatus(result) != PGRES_COMMAND_OK)
155 : {
156 0 : pg_log_error("database removal failed: %s", PQerrorMessage(conn));
157 0 : PQfinish(conn);
158 0 : exit(1);
159 : }
160 :
161 0 : PQclear(result);
162 0 : PQfinish(conn);
163 0 : exit(0);
164 : }
165 :
166 :
167 : static void
168 0 : help(const char *progname)
169 : {
170 0 : printf(_("%s removes a PostgreSQL database.\n\n"), progname);
171 0 : printf(_("Usage:\n"));
172 0 : printf(_(" %s [OPTION]... DBNAME\n"), progname);
173 0 : printf(_("\nOptions:\n"));
174 0 : printf(_(" -e, --echo show the commands being sent to the server\n"));
175 0 : printf(_(" -f, --force try to terminate other connections before dropping\n"));
176 0 : printf(_(" -i, --interactive prompt before deleting anything\n"));
177 0 : printf(_(" -V, --version output version information, then exit\n"));
178 0 : printf(_(" --if-exists don't report error if database doesn't exist\n"));
179 0 : printf(_(" -?, --help show this help, then exit\n"));
180 0 : printf(_("\nConnection options:\n"));
181 0 : printf(_(" -h, --host=HOSTNAME database server host or socket directory\n"));
182 0 : printf(_(" -p, --port=PORT database server port\n"));
183 0 : printf(_(" -U, --username=USERNAME user name to connect as\n"));
184 0 : printf(_(" -w, --no-password never prompt for password\n"));
185 0 : printf(_(" -W, --password force password prompt\n"));
186 0 : printf(_(" --maintenance-db=DBNAME alternate maintenance database\n"));
187 0 : printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
188 0 : printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
189 0 : }
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