74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_description.h
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* definition of the "description" system catalog (pg_description)
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*
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* Because the contents of this table are taken from the *.dat files
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* of other catalogs, there is no pg_description.dat file. The initial
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* contents are assembled by genbki.pl and loaded during initdb.
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*
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* NOTE: an object is identified by the OID of the row that primarily
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* defines the object, plus the OID of the table that that row appears in.
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* For example, a function is identified by the OID of its pg_proc row
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* plus the pg_class OID of table pg_proc. This allows unique identification
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* of objects without assuming that OIDs are unique across tables.
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*
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* Since attributes don't have OIDs of their own, we identify an attribute
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* comment by the objoid+classoid of its parent table, plus an "objsubid"
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* giving the attribute column number. "objsubid" must be zero in a comment
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* for a table itself, so that it is distinct from any column comment.
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* Currently, objsubid is unused and zero for all other kinds of objects,
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* but perhaps it might be useful someday to associate comments with
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* constituent elements of other kinds of objects (arguments of a function,
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* for example).
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*
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*
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* Portions Copyright (c) 1996-2024, 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_description.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_DESCRIPTION_H
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#define PG_DESCRIPTION_H
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#include "catalog/genbki.h"
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#include "catalog/pg_description_d.h"
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/* ----------------
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* pg_description definition. cpp turns this into
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* typedef struct FormData_pg_description
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* ----------------
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*/
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CATALOG(pg_description,2609,DescriptionRelationId)
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{
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Oid objoid; /* OID of object itself */
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Oid classoid; /* OID of table containing object */
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int32 objsubid; /* column number, or 0 if not used */
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#ifdef CATALOG_VARLEN /* variable-length fields start here */
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text description BKI_FORCE_NOT_NULL; /* description of object */
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#endif
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} FormData_pg_description;
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/* ----------------
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* Form_pg_description corresponds to a pointer to a tuple with
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* the format of pg_description relation.
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* ----------------
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*/
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typedef FormData_pg_description * Form_pg_description;
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DECLARE_TOAST(pg_description, 2834, 2835);
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DECLARE_UNIQUE_INDEX_PKEY(pg_description_o_c_o_index, 2675, DescriptionObjIndexId, pg_description, btree(objoid oid_ops, classoid oid_ops, objsubid int4_ops));
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/* We do not use BKI_LOOKUP here because it causes problems for genbki.pl */
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DECLARE_FOREIGN_KEY((classoid), pg_class, (oid));
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#endif /* PG_DESCRIPTION_H */
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