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951ec872c7
Behavior of backslash commands (especially for large objects) may still require some thought.
378 lines
7.1 KiB
C
378 lines
7.1 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright 2000-2002 by PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/src/bin/psql/large_obj.c,v 1.23 2002/10/15 02:24:16 tgl Exp $
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*/
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#include "postgres_fe.h"
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#include "large_obj.h"
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#include "libpq-fe.h"
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#include "settings.h"
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#include "variables.h"
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#include "common.h"
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#include "print.h"
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#define atooid(x) ((Oid) strtoul((x), NULL, 10))
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/*
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* Since all large object ops must be in a transaction, we must do some magic
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* here. You can set the variable lo_transaction to one of commit|rollback|
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* nothing to get your favourite behaviour regarding any transaction in
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* progress. Rollback is default.
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*/
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static char notice[80];
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static void
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_my_notice_handler(void *arg, const char *message)
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{
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(void) arg;
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strncpy(notice, message, 79);
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notice[79] = '\0';
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}
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static bool
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handle_transaction(void)
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{
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const char *var = GetVariable(pset.vars, "LO_TRANSACTION");
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PGresult *res;
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bool commit;
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PQnoticeProcessor old_notice_hook;
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if (var && strcmp(var, "nothing") == 0)
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return true;
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commit = (var && strcmp(var, "commit") == 0);
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notice[0] = '\0';
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old_notice_hook = PQsetNoticeProcessor(pset.db, _my_notice_handler, NULL);
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res = PSQLexec(commit ? "COMMIT" : "ROLLBACK", false);
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if (!res)
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return false;
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if (notice[0])
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{
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if ((!commit && strcmp(notice, "WARNING: ROLLBACK: no transaction in progress\n") != 0) ||
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(commit && strcmp(notice, "WARNING: COMMIT: no transaction in progress\n") != 0))
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fputs(notice, stderr);
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}
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else if (!QUIET())
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{
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if (commit)
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puts(gettext("Warning: Your transaction in progress has been committed."));
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else
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puts(gettext("Warning: Your transaction in progress has been rolled back."));
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}
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PQsetNoticeProcessor(pset.db, old_notice_hook, NULL);
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return true;
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}
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/*
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* do_lo_export()
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*
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* Write a large object to a file
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*/
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bool
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do_lo_export(const char *loid_arg, const char *filename_arg)
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{
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PGresult *res;
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int status;
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bool own_transaction = true;
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const char *var = GetVariable(pset.vars, "LO_TRANSACTION");
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if (var && strcmp(var, "nothing") == 0)
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own_transaction = false;
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if (!pset.db)
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{
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psql_error("\\lo_export: not connected to a database\n");
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return false;
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}
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if (own_transaction)
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{
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if (!handle_transaction())
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return false;
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if (!(res = PSQLexec("BEGIN", false)))
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return false;
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PQclear(res);
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}
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status = lo_export(pset.db, atooid(loid_arg), filename_arg);
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if (status != 1)
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{ /* of course this status is documented
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* nowhere :( */
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fputs(PQerrorMessage(pset.db), stderr);
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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return false;
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}
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if (own_transaction)
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{
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if (!(res = PSQLexec("COMMIT", false)))
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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return false;
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}
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PQclear(res);
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}
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fprintf(pset.queryFout, "lo_export\n");
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return true;
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}
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/*
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* do_lo_import()
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*
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* Copy large object from file to database
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*/
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bool
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do_lo_import(const char *filename_arg, const char *comment_arg)
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{
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PGresult *res;
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Oid loid;
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char oidbuf[32];
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unsigned int i;
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bool own_transaction = true;
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const char *var = GetVariable(pset.vars, "LO_TRANSACTION");
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if (var && strcmp(var, "nothing") == 0)
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own_transaction = false;
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if (!pset.db)
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{
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psql_error("\\lo_import: not connected to a database\n");
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return false;
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}
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if (own_transaction)
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{
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if (!handle_transaction())
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return false;
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if (!(res = PSQLexec("BEGIN", false)))
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return false;
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PQclear(res);
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}
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loid = lo_import(pset.db, filename_arg);
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if (loid == InvalidOid)
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{
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fputs(PQerrorMessage(pset.db), stderr);
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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return false;
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}
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/* insert description if given */
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/* XXX don't try to hack pg_description if not superuser */
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/* XXX ought to replace this with some kind of COMMENT command */
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if (comment_arg && pset.issuper)
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{
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char *cmdbuf;
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char *bufptr;
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size_t slen = strlen(comment_arg);
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cmdbuf = malloc(slen * 2 + 256);
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if (!cmdbuf)
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{
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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return false;
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}
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sprintf(cmdbuf,
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"INSERT INTO pg_catalog.pg_description VALUES ('%u', "
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"'pg_catalog.pg_largeobject'::regclass, "
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"0, '",
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loid);
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bufptr = cmdbuf + strlen(cmdbuf);
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for (i = 0; i < slen; i++)
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{
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if (comment_arg[i] == '\'' || comment_arg[i] == '\\')
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*bufptr++ = '\\';
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*bufptr++ = comment_arg[i];
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}
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strcpy(bufptr, "')");
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if (!(res = PSQLexec(cmdbuf, false)))
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{
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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free(cmdbuf);
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return false;
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}
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PQclear(res);
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free(cmdbuf);
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}
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if (own_transaction)
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{
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if (!(res = PSQLexec("COMMIT", false)))
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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return false;
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}
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PQclear(res);
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}
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fprintf(pset.queryFout, "lo_import %u\n", loid);
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sprintf(oidbuf, "%u", loid);
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SetVariable(pset.vars, "LASTOID", oidbuf);
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return true;
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}
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/*
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* do_lo_unlink()
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*
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* removes a large object out of the database
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*/
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bool
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do_lo_unlink(const char *loid_arg)
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{
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PGresult *res;
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int status;
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Oid loid = atooid(loid_arg);
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char buf[256];
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bool own_transaction = true;
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const char *var = GetVariable(pset.vars, "LO_TRANSACTION");
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if (var && strcmp(var, "nothing") == 0)
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own_transaction = false;
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if (!pset.db)
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{
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psql_error("\\lo_unlink: not connected to a database\n");
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return false;
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}
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if (own_transaction)
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{
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if (!handle_transaction())
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return false;
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if (!(res = PSQLexec("BEGIN", false)))
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return false;
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PQclear(res);
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}
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status = lo_unlink(pset.db, loid);
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if (status == -1)
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{
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fputs(PQerrorMessage(pset.db), stderr);
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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return false;
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}
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/* remove the comment as well */
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/* XXX don't try to hack pg_description if not superuser */
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/* XXX ought to replace this with some kind of COMMENT command */
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if (pset.issuper)
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{
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sprintf(buf, "DELETE FROM pg_catalog.pg_description WHERE objoid = '%u' "
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"AND classoid = 'pg_catalog.pg_largeobject'::regclass",
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loid);
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if (!(res = PSQLexec(buf, false)))
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{
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if (own_transaction)
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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}
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return false;
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}
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}
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if (own_transaction)
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{
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if (!(res = PSQLexec("COMMIT", false)))
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{
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res = PQexec(pset.db, "ROLLBACK");
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PQclear(res);
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return false;
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}
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PQclear(res);
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}
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fprintf(pset.queryFout, "lo_unlink %u\n", loid);
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return true;
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}
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/*
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* do_lo_list()
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*
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* Show all large objects in database with comments
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*/
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bool
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do_lo_list(void)
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{
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PGresult *res;
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char buf[1024];
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printQueryOpt myopt = pset.popt;
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snprintf(buf, sizeof(buf),
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"SELECT loid as \"ID\", pg_catalog.obj_description(loid, 'pg_largeobject') as \"%s\"\n"
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"FROM (SELECT DISTINCT loid FROM pg_catalog.pg_largeobject) x\n"
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"ORDER BY \"ID\"",
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gettext("Description"));
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res = PSQLexec(buf, false);
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if (!res)
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return false;
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myopt.topt.tuples_only = false;
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myopt.nullPrint = NULL;
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myopt.title = gettext("Large objects");
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printQuery(res, &myopt, pset.queryFout);
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PQclear(res);
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return true;
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}
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