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/*-------------------------------------------------------------------------
*
* pg_depend.h
* definition of the system "dependency" relation (pg_depend)
* along with the relation's initial contents.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pg_depend.h,v 1.2 2003/08/04 02:40:12 momjian Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
* information from the DATA() statements.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_DEPEND_H
#define PG_DEPEND_H
/* ----------------
* postgres.h contains the system type definitions and the
* CATALOG(), BOOTSTRAP and DATA() sugar words so this file
* can be read by both genbki.sh and the C compiler.
* ----------------
*/
/* ----------------
* pg_depend definition. cpp turns this into
* typedef struct FormData_pg_depend
* ----------------
*/
CATALOG(pg_depend) BKI_WITHOUT_OIDS
{
/*
* Identification of the dependent (referencing) object.
*
* These fields are all zeroes for a DEPENDENCY_PIN entry.
*/
Oid classid; /* OID of table containing object */
Oid objid; /* OID of object itself */
int4 objsubid; /* column number, or 0 if not used */
/*
* Identification of the independent (referenced) object.
*/
Oid refclassid; /* OID of table containing object */
Oid refobjid; /* OID of object itself */
int4 refobjsubid; /* column number, or 0 if not used */
/*
* Precise semantics of the relationship are specified by the deptype
* field. See DependencyType in catalog/dependency.h.
*/
char deptype; /* see codes in dependency.h */
} FormData_pg_depend;
/* ----------------
* Form_pg_depend corresponds to a pointer to a row with
* the format of pg_depend relation.
* ----------------
*/
typedef FormData_pg_depend *Form_pg_depend;
/* ----------------
* compiler constants for pg_depend
* ----------------
*/
#define Natts_pg_depend 7
#define Anum_pg_depend_classid 1
#define Anum_pg_depend_objid 2
#define Anum_pg_depend_objsubid 3
#define Anum_pg_depend_refclassid 4
#define Anum_pg_depend_refobjid 5
#define Anum_pg_depend_refobjsubid 6
#define Anum_pg_depend_deptype 7
/*
* pg_depend has no preloaded contents; system-defined dependencies are
* loaded into it during a late stage of the initdb process.
*
* NOTE: we do not represent all possible dependency pairs in pg_depend;
* for example, there's not much value in creating an explicit dependency
* from an attribute to its relation. Usually we make a dependency for
* cases where the relationship is conditional rather than essential
* (for example, not all triggers are dependent on constraints, but all
* attributes are dependent on relations) or where the dependency is not
* convenient to find from the contents of other catalogs.
*/
#endif /* PG_DEPEND_H */
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