74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_depend.h
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* definition of the system "dependency" relation (pg_depend)
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*
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* pg_depend has no preloaded contents, so there is no pg_depend.dat
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* file; system-defined dependencies are loaded into it during a late stage
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* of the initdb process.
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*
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* NOTE: we do not represent all possible dependency pairs in pg_depend;
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* for example, there's not much value in creating an explicit dependency
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* from an attribute to its relation. Usually we make a dependency for
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* cases where the relationship is conditional rather than essential
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* (for example, not all triggers are dependent on constraints, but all
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* attributes are dependent on relations) or where the dependency is not
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* convenient to find from the contents of other catalogs.
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*
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*
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* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/catalog/pg_depend.h
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*
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* NOTES
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* The Catalog.pm module reads this file and derives schema
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* information.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_DEPEND_H
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#define PG_DEPEND_H
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#include "catalog/genbki.h"
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#include "catalog/pg_depend_d.h"
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/* ----------------
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* pg_depend definition. cpp turns this into
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* typedef struct FormData_pg_depend
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* ----------------
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*/
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CATALOG(pg_depend,2608,DependRelationId) BKI_WITHOUT_OIDS
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{
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/*
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* Identification of the dependent (referencing) object.
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*
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* These fields are all zeroes for a DEPENDENCY_PIN entry.
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*/
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Oid classid; /* OID of table containing object */
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Oid objid; /* OID of object itself */
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int32 objsubid; /* column number, or 0 if not used */
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/*
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* Identification of the independent (referenced) object.
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*/
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Oid refclassid; /* OID of table containing object */
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Oid refobjid; /* OID of object itself */
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int32 refobjsubid; /* column number, or 0 if not used */
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/*
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* Precise semantics of the relationship are specified by the deptype
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* field. See DependencyType in catalog/dependency.h.
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*/
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char deptype; /* see codes in dependency.h */
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} FormData_pg_depend;
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/* ----------------
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* Form_pg_depend corresponds to a pointer to a row with
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* the format of pg_depend relation.
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* ----------------
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*/
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typedef FormData_pg_depend *Form_pg_depend;
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#endif /* PG_DEPEND_H */
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