348 lines
6.3 KiB
C
348 lines
6.3 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright 2000 by PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/src/bin/psql/large_obj.c,v 1.13 2001/02/10 02:31:28 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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/*
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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");
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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, "NOTICE: ROLLBACK: no transaction in progress\n") != 0) ||
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(commit && strcmp(notice, "NOTICE: 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("Warning: Your transaction in progress has been committed.");
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else
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puts("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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if (!pset.cur_cmd_interactive)
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fprintf(stderr, "%s: ", pset.progname);
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fputs("\\lo_export: not connected to a database\n", stderr);
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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")))
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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, atol(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")))
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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 buf[1024];
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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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if (!pset.cur_cmd_interactive)
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fprintf(stderr, "%s: ", pset.progname);
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fputs("\\lo_import: not connected to a database\n", stderr);
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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")))
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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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if (comment_arg)
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{
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sprintf(buf, "INSERT INTO pg_description VALUES (%u, '", loid);
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for (i = 0; i < strlen(comment_arg); i++)
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if (comment_arg[i] == '\'')
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strcat(buf, "\\'");
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else
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strncat(buf, &comment_arg[i], 1);
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strcat(buf, "')");
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if (!(res = PSQLexec(buf)))
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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")))
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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 %d\n", loid);
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sprintf(buf, "%u", (unsigned int) loid);
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SetVariable(pset.vars, "LASTOID", buf);
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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 = (Oid) atol(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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if (!pset.cur_cmd_interactive)
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fprintf(stderr, "%s: ", pset.progname);
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fputs("\\lo_unlink: not connected to a database\n", stderr);
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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")))
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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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sprintf(buf, "DELETE FROM pg_description WHERE objoid = %u", loid);
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if (!(res = PSQLexec(buf)))
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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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if (own_transaction)
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{
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if (!(res = PSQLexec("COMMIT")))
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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 %d\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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strcpy(buf,
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"SELECT loid as \"ID\", obj_description(loid) as \"Description\"\n"
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"FROM (SELECT DISTINCT loid FROM pg_largeobject) x\n"
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"ORDER BY \"ID\"");
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res = PSQLexec(buf);
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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 = "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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