PostgreSQL Source Code: src/include/catalog/pg_depend.h Source File

pg_depend.h

1/*-------------------------------------------------------------------------

2 *

3 * pg_depend.h

4 * definition of the "dependency" system catalog (pg_depend)

5 *

6 * pg_depend has no preloaded contents, so there is no pg_depend.dat

7 * file; dependencies for system-defined objects are loaded into it

8 * on-the-fly during initdb. Most built-in objects are pinned anyway,

9 * and hence need no explicit entries in pg_depend.

10 *

11 * NOTE: we do not represent all possible dependency pairs in pg_depend;

12 * for example, there's not much value in creating an explicit dependency

13 * from an attribute to its relation. Usually we make a dependency for

14 * cases where the relationship is conditional rather than essential

15 * (for example, not all triggers are dependent on constraints, but all

16 * attributes are dependent on relations) or where the dependency is not

17 * convenient to find from the contents of other catalogs.

18 *

19 *

20 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group

21 * Portions Copyright (c) 1994, Regents of the University of California

22 *

23 * src/include/catalog/pg_depend.h

24 *

25 * NOTES

26 * The Catalog.pm module reads this file and derives schema

27 * information.

28 *

29 *-------------------------------------------------------------------------

30 */

31#ifndef PG_DEPEND_H

32#define PG_DEPEND_H

33

34#include "catalog/genbki.h"

35#include "catalog/pg_depend_d.h" /* IWYU pragma: export */

36

37/* ----------------

38 * pg_depend definition. cpp turns this into

39 * typedef struct FormData_pg_depend

40 * ----------------

41 */

42 CATALOG(pg_depend,2608,DependRelationId)

43{

44 /*

45 * Identification of the dependent (referencing) object.

46 */

47 Oid classid BKI_LOOKUP(pg_class); /* OID of table containing

48 * object */

49 Oid objid; /* OID of object itself */

50 int32 objsubid; /* column number, or 0 if not used */

51

52 /*

53 * Identification of the independent (referenced) object.

54 */

55 Oid refclassid BKI_LOOKUP(pg_class); /* OID of table containing

56 * object */

57 Oid refobjid; /* OID of object itself */

58 int32 refobjsubid; /* column number, or 0 if not used */

59

60 /*

61 * Precise semantics of the relationship are specified by the deptype

62 * field. See DependencyType in catalog/dependency.h.

63 */

64 char deptype; /* see codes in dependency.h */

65 } FormData_pg_depend;

66

67/* ----------------

68 * Form_pg_depend corresponds to a pointer to a row with

69 * the format of pg_depend relation.

70 * ----------------

71 */

72 typedef FormData_pg_depend *Form_pg_depend;

73

74 DECLARE_INDEX(pg_depend_depender_index, 2673, DependDependerIndexId, pg_depend, btree(classid oid_ops, objid oid_ops, objsubid int4_ops));

75 DECLARE_INDEX(pg_depend_reference_index, 2674, DependReferenceIndexId, pg_depend, btree(refclassid oid_ops, refobjid oid_ops, refobjsubid int4_ops));

76

77#endif /* PG_DEPEND_H */