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https://github.com/postgres/postgres.git
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Major psql overhaul by Peter Eisentraut.
This commit is contained in:
Bruce Momjian
311
src/bin/psql/large_obj.c
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311
src/bin/psql/large_obj.c
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#include <config.h>
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#include <c.h>
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#include "large_obj.h"
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#include <stdio.h>
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#include <string.h>
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#include <libpq-fe.h>
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#include <postgres.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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(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(PsqlSettings * pset)
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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(pset, 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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if ( (!commit && strcmp(notice, "NOTICE: UserAbortTransactionBlock and not in in-progress state\n")!=0) ||
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(commit && strcmp(notice, "NOTICE: EndTransactionBlock and not inprogress/abort state\n")!=0) )
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fputs(notice, stderr);
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}
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else if (!GetVariableBool(pset->vars, "quiet")) {
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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(PsqlSettings * pset, 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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fputs("You are 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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if (!handle_transaction(pset))
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return false;
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if (!(res = PSQLexec(pset, "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), (char *)filename_arg);
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if (status != 1) { /* of course this status is documented nowhere :( */
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fputs(PQerrorMessage(pset->db), stderr);
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if (own_transaction) {
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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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if (!(res = PSQLexec(pset, "COMMIT"))) {
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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(PsqlSettings * pset, 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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fputs("You are 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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if (!handle_transaction(pset))
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return false;
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if (!(res = PSQLexec(pset, "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, (char *)filename_arg);
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if (loid == InvalidOid) {
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fputs(PQerrorMessage(pset->db), stderr);
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if (own_transaction) {
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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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sprintf(buf, "INSERT INTO pg_description VALUES (%d, '", 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(pset, buf))) {
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if (own_transaction) {
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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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if (!(res = PSQLexec(pset, "COMMIT"))) {
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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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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 do_lo_unlink(PsqlSettings * pset, 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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fputs("You are 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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if (!handle_transaction(pset))
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return false;
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if (!(res = PSQLexec(pset, "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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fputs(PQerrorMessage(pset->db), stderr);
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if (own_transaction) {
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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 = %d", loid);
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if (!(res = PSQLexec(pset, buf))) {
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if (own_transaction) {
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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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if (!(res = PSQLexec(pset, "COMMIT"))) {
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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 if desired
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*/
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bool do_lo_list(PsqlSettings * pset)
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{
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PGresult * res;
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char descbuf[512];
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printQueryOpt myopt = pset->popt;
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descbuf[0] = '\0';
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strcat(descbuf, "SELECT usename as \"Owner\", substring(relname from 5) as \"ID\"");
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if (GetVariableBool(pset->vars, "description"))
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strcat(descbuf, ",\n obj_description(pg_class.oid) as \"Description\"");
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strcat(descbuf,"\nFROM pg_class, pg_user\n"
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"WHERE usesysid = relowner AND relkind = 'l'\n"
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"ORDER BY \"ID\"");
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res = PSQLexec(pset, descbuf);
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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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