pg_largeobject.h

Go to the documentation of this file.

/*-------------------------------------------------------------------------
 *
 * pg_largeobject.h
 *    definition of the "large object" system catalog (pg_largeobject)
 *
 *
 * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_largeobject.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_LARGEOBJECT_H
#define PG_LARGEOBJECT_H
 
#include "catalog/genbki.h"
#include "catalog/pg_largeobject_d.h"
#include "utils/snapshot.h"
 
/* ----------------
 *      pg_largeobject definition.  cpp turns this into
 *      typedef struct FormData_pg_largeobject
 * ----------------
 */
CATALOG(pg_largeobject,2613,LargeObjectRelationId)
{
    Oid         loid BKI_LOOKUP(pg_largeobject_metadata);   /* Identifier of large
                                                             * object */
    int32       pageno;         /* Page number (starting from 0) */
 
    /* data has variable length, but we allow direct access; see inv_api.c */
    bytea       data BKI_FORCE_NOT_NULL;    /* Data for page (may be
                                             * zero-length) */
} FormData_pg_largeobject;
 
/* ----------------
 *      Form_pg_largeobject corresponds to a pointer to a tuple with
 *      the format of pg_largeobject relation.
 * ----------------
 */
typedef FormData_pg_largeobject *Form_pg_largeobject;
 
DECLARE_UNIQUE_INDEX_PKEY(pg_largeobject_loid_pn_index, 2683, LargeObjectLOidPNIndexId, pg_largeobject, btree(loid oid_ops, pageno int4_ops));
 
extern Oid  LargeObjectCreate(Oid loid);
extern void LargeObjectDrop(Oid loid);
extern bool LargeObjectExists(Oid loid);
extern bool LargeObjectExistsWithSnapshot(Oid loid, Snapshot snapshot);
 
#endif                          /* PG_LARGEOBJECT_H */