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/*------------------------------------------------------------------------- * * pg_description.h * definition of the system "description" relation (pg_description) * * NOTE: an object is identified by the OID of the row that primarily * defines the object, plus the OID of the table that that row appears in. * For example, a function is identified by the OID of its pg_proc row * plus the pg_class OID of table pg_proc. This allows unique identification * of objects without assuming that OIDs are unique across tables. * * Since attributes don't have OIDs of their own, we identify an attribute * comment by the objoid+classoid of its parent table, plus an "objsubid" * giving the attribute column number. "objsubid" must be zero in a comment * for a table itself, so that it is distinct from any column comment. * Currently, objsubid is unused and zero for all other kinds of objects, * but perhaps it might be useful someday to associate comments with * constituent elements of other kinds of objects (arguments of a function, * for example). * * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/catalog/pg_description.h * * NOTES * the genbki.pl script reads this file and generates .bki * information from the DATA() statements. * * XXX do NOT break up DATA() statements into multiple lines! * the scripts are not as smart as you might think... * *------------------------------------------------------------------------- */ #ifndef PG_DESCRIPTION_H #define PG_DESCRIPTION_H #include "catalog/genbki.h" /* ---------------- * pg_description definition. cpp turns this into * typedef struct FormData_pg_description * ---------------- */ #define DescriptionRelationId 2609 CATALOG(pg_description,2609) BKI_WITHOUT_OIDS { Oid objoid; /* OID of object itself */ Oid classoid; /* OID of table containing object */ int4 objsubid; /* column number, or 0 if not used */ #ifdef CATALOG_VARLEN /* variable-length fields start here */ text description; /* description of object */ #endif } FormData_pg_description; /* ---------------- * Form_pg_description corresponds to a pointer to a tuple with * the format of pg_description relation. * ---------------- */ typedef FormData_pg_description *Form_pg_description; /* ---------------- * compiler constants for pg_description * ---------------- */ #define Natts_pg_description 4 #define Anum_pg_description_objoid 1 #define Anum_pg_description_classoid 2 #define Anum_pg_description_objsubid 3 #define Anum_pg_description_description 4 /* ---------------- * initial contents of pg_description * ---------------- */ /* * Because the contents of this table are taken from the other *.h files, * there is no initialization here. The initial contents are extracted * by genbki.pl and loaded during initdb. */ #endif /* PG_DESCRIPTION_H */