granicus.if.org Git - postgresql/blob - src/include/catalog/pg_largeobject.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pg_largeobject.h
   4  *        definition of the system "largeobject" relation (pg_largeobject)
   5  *        along with the relation's initial contents.
   6  *
   7  *
   8  * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
   9  * Portions Copyright (c) 1994, Regents of the University of California
  10  *
  11  * src/include/catalog/pg_largeobject.h
  12  *
  13  * NOTES
  14  *        the genbki.pl script reads this file and generates .bki
  15  *        information from the DATA() statements.
  16  *
  17  *-------------------------------------------------------------------------
  18  */
  19 #ifndef PG_LARGEOBJECT_H
  20 #define PG_LARGEOBJECT_H
  21
  22 #include "catalog/genbki.h"
  23
  24 /* ----------------
  25  *              pg_largeobject definition.  cpp turns this into
  26  *              typedef struct FormData_pg_largeobject
  27  * ----------------
  28  */
  29 #define LargeObjectRelationId  2613
  30
  31 CATALOG(pg_largeobject,2613) BKI_WITHOUT_OIDS
  32 {
  33         Oid                     loid;                   /* Identifier of large object */
  34         int32           pageno;                 /* Page number (starting from 0) */
  35
  36         /* data has variable length, but we allow direct access; see inv_api.c */
  37         bytea           data BKI_FORCE_NOT_NULL; /* Data for page (may be zero-length) */
  38 } FormData_pg_largeobject;
  39
  40 /* ----------------
  41  *              Form_pg_largeobject corresponds to a pointer to a tuple with
  42  *              the format of pg_largeobject relation.
  43  * ----------------
  44  */
  45 typedef FormData_pg_largeobject *Form_pg_largeobject;
  46
  47 /* ----------------
  48  *              compiler constants for pg_largeobject
  49  * ----------------
  50  */
  51 #define Natts_pg_largeobject                    3
  52 #define Anum_pg_largeobject_loid                1
  53 #define Anum_pg_largeobject_pageno              2
  54 #define Anum_pg_largeobject_data                3
  55
  56 extern Oid      LargeObjectCreate(Oid loid);
  57 extern void LargeObjectDrop(Oid loid);
  58 extern bool LargeObjectExists(Oid loid);
  59
  60 #endif   /* PG_LARGEOBJECT_H */