178 lines
3.9 KiB
C
178 lines
3.9 KiB
C
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <time.h>
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#include <libpq-fe.h>
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#include <libpq/libpq-fs.h>
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#include "pg_dumplo.h"
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extern int errno;
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#define LOAD_LOLIST_QUERY "\
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SELECT c.relname, a.attname \
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FROM pg_class c, pg_attribute a, pg_type t \
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WHERE a.attnum > 0 \
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AND a.attrelid = c.oid \
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AND a.atttypid = t.oid \
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AND t.typname = 'oid' \
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AND c.relname NOT LIKE 'pg_%'"
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void
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load_lolist( LODumpMaster *pgLO )
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{
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LOlist *ll;
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int i;
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int n;
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/* ----------
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* Now find any candidate tables who have columns of type oid (the
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* column oid is ignored, as it has attnum < 1)
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* ----------
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*/
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if (!(pgLO->res = PQexec(pgLO->conn, LOAD_LOLIST_QUERY))) {
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fprintf(stderr, "%s: Select from pg_class failed.\n", progname);
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exit(RE_ERROR);
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}
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if ((n = PQntuples(pgLO->res)) == 0) {
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fprintf(stderr, "%s: No large objects in the database.\n", progname);
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exit(RE_ERROR);
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}
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pgLO->lolist = (LOlist *) malloc((n + 1) * sizeof(LOlist));
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if (!pgLO->lolist) {
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fprintf(stderr, "%s: can't allocate memory\n", progname);
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exit(RE_ERROR);
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}
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for (i = 0, ll = pgLO->lolist; i < n; i++, ll++) {
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ll->lo_table = strdup(PQgetvalue(pgLO->res, i, 0));
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ll->lo_attr = strdup(PQgetvalue(pgLO->res, i, 1));
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}
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PQclear(pgLO->res);
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ll++;
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ll->lo_table = ll->lo_attr = (char *) NULL;
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}
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void
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pglo_export(LODumpMaster *pgLO)
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{
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LOlist *ll;
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int tuples;
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char path[BUFSIZ],
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Qbuff[QUERY_BUFSIZ];
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if (pgLO->action != ACTION_SHOW) {
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time_t t;
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time(&t);
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fprintf(pgLO->index, "#\n# This is the PostgreSQL large object dump index\n#\n");
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fprintf(pgLO->index, "#\tDate: %s", ctime(&t));
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fprintf(pgLO->index, "#\tHost: %s\n", pgLO->host);
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fprintf(pgLO->index, "#\tDatabase: %s\n", pgLO->db);
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fprintf(pgLO->index, "#\tUser: %s\n", pgLO->user);
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fprintf(pgLO->index, "#\n# oid\ttable\tattribut\tinfile\n#\n");
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}
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pgLO->counter = 0;
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for(ll=pgLO->lolist; ll->lo_table != NULL; ll++) {
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/* ----------
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* Query
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* ----------
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*/
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sprintf(Qbuff, "SELECT DISTINCT x.\"%s\" FROM \"%s\" x, pg_largeobject l WHERE x.\"%s\" = l.loid",
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ll->lo_attr, ll->lo_table, ll->lo_attr);
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/* puts(Qbuff); */
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pgLO->res = PQexec(pgLO->conn, Qbuff);
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if ((tuples = PQntuples(pgLO->res)) == 0) {
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if (!pgLO->quiet && pgLO->action == ACTION_EXPORT_ATTR)
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printf("%s: no large objects in '%s'\n",
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progname, ll->lo_table);
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continue;
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} else if (check_res(pgLO)) {
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int t;
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char *val;
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/* ----------
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* Create DIR/FILE
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* ----------
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*/
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if (tuples && pgLO->action != ACTION_SHOW) {
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sprintf(path, "%s/%s/%s", pgLO->space, pgLO->db, ll->lo_table);
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if (mkdir(path, DIR_UMASK) == -1) {
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if (errno != EEXIST) {
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perror(path);
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exit(RE_ERROR);
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}
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}
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sprintf(path, "%s/%s", path, ll->lo_attr);
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if (mkdir(path, DIR_UMASK) == -1) {
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if (errno != EEXIST) {
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perror(path);
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exit(RE_ERROR);
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}
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}
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if (!pgLO->quiet)
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printf("dump %s.%s (%d large obj)\n",
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ll->lo_table, ll->lo_attr, tuples);
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}
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pgLO->counter += tuples;
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for(t=0; t<tuples; t++) {
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Oid lo = (Oid) 0;
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val = PQgetvalue(pgLO->res, t, 0);
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if (!val)
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continue;
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else
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lo = (Oid) atol(val);
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if (pgLO->action == ACTION_SHOW) {
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printf("%s.%s: %ld\n", ll->lo_table,
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ll->lo_attr, (long) lo);
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continue;
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}
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sprintf(path, "%s/%s/%s/%s/%s", pgLO->space,
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pgLO->db, ll->lo_table, ll->lo_attr, val);
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if (lo_export(pgLO->conn, lo, path) < 0)
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fprintf(stderr, "%s: %s\n", PQerrorMessage(pgLO->conn), progname);
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else
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fprintf(pgLO->index, "%s\t%s\t%s\t%s/%s/%s/%s\n", val,
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ll->lo_table, ll->lo_attr, pgLO->db, ll->lo_table, ll->lo_attr, val);
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}
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}
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}
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}
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