src/include/catalog/pg_depend.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pg_depend.h
   4  *        definition of the system "dependency" relation (pg_depend)
   5  *        along with the relation's initial contents.
   6  *
   7  *
   8  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   9  * Portions Copyright (c) 1994, Regents of the University of California
  10  *
  11  * $PostgreSQL$
  12  *
  13  * NOTES
  14  *        the genbki.sh script reads this file and generates .bki
  15  *        information from the DATA() statements.
  16  *
  17  *-------------------------------------------------------------------------
  18  */
  19 #ifndef PG_DEPEND_H
  20 #define PG_DEPEND_H
  21
  22 #include "catalog/genbki.h"
  23
  24 /* ----------------
  25  *              pg_depend definition.  cpp turns this into
  26  *              typedef struct FormData_pg_depend
  27  * ----------------
  28  */
  29 #define DependRelationId  2608
  30
  31 CATALOG(pg_depend,2608) BKI_WITHOUT_OIDS
  32 {
  33         /*
  34          * Identification of the dependent (referencing) object.
  35          *
  36          * These fields are all zeroes for a DEPENDENCY_PIN entry.
  37          */
  38         Oid                     classid;                /* OID of table containing object */
  39         Oid                     objid;                  /* OID of object itself */
  40         int4            objsubid;               /* column number, or 0 if not used */
  41
  42         /*
  43          * Identification of the independent (referenced) object.
  44          */
  45         Oid                     refclassid;             /* OID of table containing object */
  46         Oid                     refobjid;               /* OID of object itself */
  47         int4            refobjsubid;    /* column number, or 0 if not used */
  48
  49         /*
  50          * Precise semantics of the relationship are specified by the deptype
  51          * field.  See DependencyType in catalog/dependency.h.
  52          */
  53         char            deptype;                /* see codes in dependency.h */
  54 } FormData_pg_depend;
  55
  56 /* ----------------
  57  *              Form_pg_depend corresponds to a pointer to a row with
  58  *              the format of pg_depend relation.
  59  * ----------------
  60  */
  61 typedef FormData_pg_depend *Form_pg_depend;
  62
  63 /* ----------------
  64  *              compiler constants for pg_depend
  65  * ----------------
  66  */
  67 #define Natts_pg_depend                         7
  68 #define Anum_pg_depend_classid          1
  69 #define Anum_pg_depend_objid            2
  70 #define Anum_pg_depend_objsubid         3
  71 #define Anum_pg_depend_refclassid       4
  72 #define Anum_pg_depend_refobjid         5
  73 #define Anum_pg_depend_refobjsubid      6
  74 #define Anum_pg_depend_deptype          7
  75
  76
  77 /*
  78  * pg_depend has no preloaded contents; system-defined dependencies are
  79  * loaded into it during a late stage of the initdb process.
  80  *
  81  * NOTE: we do not represent all possible dependency pairs in pg_depend;
  82  * for example, there's not much value in creating an explicit dependency
  83  * from an attribute to its relation.  Usually we make a dependency for
  84  * cases where the relationship is conditional rather than essential
  85  * (for example, not all triggers are dependent on constraints, but all
  86  * attributes are dependent on relations) or where the dependency is not
  87  * convenient to find from the contents of other catalogs.
  88  */
  89
  90 #endif   /* PG_DEPEND_H */