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138 lines
3.5 KiB
138 lines
3.5 KiB
/*-------------------------------------------------------------------------
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*
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* pg_largeobject.c
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* routines to support manipulation of the pg_largeobject relation
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/pg_largeobject.c,v 1.1 2000/10/08 03:18:53 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "access/itup.h"
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#include "catalog/catname.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_largeobject.h"
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#include "miscadmin.h"
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#include "parser/parse_func.h"
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#include "utils/builtins.h"
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#include "utils/syscache.h"
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bytea *_byteain(const char *data, int32 size);
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bytea *_byteain(const char *data, int32 size) {
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bytea *result;
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result = (bytea *)palloc(size + VARHDRSZ);
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result->vl_len = size + VARHDRSZ;
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if (size > 0)
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memcpy(result->vl_dat, data, size);
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return result;
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}
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Oid LargeobjectCreate(Oid loid) {
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Oid retval;
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Relation pg_largeobject;
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HeapTuple ntup = (HeapTuple) palloc(sizeof(HeapTupleData));
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Relation idescs[Num_pg_largeobject_indices];
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Datum values[Natts_pg_largeobject];
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char nulls[Natts_pg_largeobject];
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int i;
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for (i=0; i<Natts_pg_largeobject; i++) {
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nulls[i] = ' ';
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values[i] = (Datum)NULL;
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}
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i = 0;
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values[i++] = ObjectIdGetDatum(loid);
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values[i++] = Int32GetDatum(0);
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values[i++] = (Datum) _byteain(NULL, 0);
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pg_largeobject = heap_openr(LargeobjectRelationName, RowExclusiveLock);
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ntup = heap_formtuple(pg_largeobject->rd_att, values, nulls);
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retval = heap_insert(pg_largeobject, ntup);
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if (!IsIgnoringSystemIndexes()) {
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CatalogOpenIndices(Num_pg_largeobject_indices, Name_pg_largeobject_indices, idescs);
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CatalogIndexInsert(idescs, Num_pg_largeobject_indices, pg_largeobject, ntup);
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CatalogCloseIndices(Num_pg_largeobject_indices, idescs);
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}
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heap_close(pg_largeobject, RowExclusiveLock);
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heap_freetuple(ntup);
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CommandCounterIncrement();
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return retval;
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}
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void LargeobjectDrop(Oid loid) {
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Relation pg_largeobject;
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Relation pg_lo_id;
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ScanKeyData skey;
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IndexScanDesc sd = (IndexScanDesc) NULL;
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RetrieveIndexResult indexRes;
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int found = 0;
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ScanKeyEntryInitialize(&skey,
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(bits16) 0x0,
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(AttrNumber) 1,
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(RegProcedure) F_OIDEQ,
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ObjectIdGetDatum(loid));
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pg_largeobject = heap_openr(LargeobjectRelationName, RowShareLock);
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pg_lo_id = index_openr(LargeobjectLOIdIndex);
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sd = index_beginscan(pg_lo_id, false, 1, &skey);
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while((indexRes = index_getnext(sd, ForwardScanDirection))) {
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found++;
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heap_delete(pg_largeobject, &indexRes->heap_iptr, NULL);
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pfree(indexRes);
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}
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index_endscan(sd);
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index_close(pg_lo_id);
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heap_close(pg_largeobject, RowShareLock);
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if (found == 0)
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elog(ERROR, "LargeobjectDrop: large object %d not found", loid);
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}
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int LargeobjectFind(Oid loid) {
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int retval = 0;
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Relation pg_lo_id;
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ScanKeyData skey;
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IndexScanDesc sd = (IndexScanDesc) NULL;
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RetrieveIndexResult indexRes;
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ScanKeyEntryInitialize(&skey,
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(bits16) 0x0,
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(AttrNumber) 1,
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(RegProcedure) F_OIDEQ,
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ObjectIdGetDatum(loid));
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pg_lo_id = index_openr(LargeobjectLOIdIndex);
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sd = index_beginscan(pg_lo_id, false, 1, &skey);
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if ((indexRes = index_getnext(sd, ForwardScanDirection))) {
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retval = 1;
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pfree(indexRes);
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}
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index_endscan(sd);
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index_close(pg_lo_id);
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return retval;
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}
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