diff options
Diffstat (limited to 'src/include/utils/rel.h')
| -rw-r--r-- | src/include/utils/rel.h | 52 |
1 files changed, 31 insertions, 21 deletions
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index 867ffa604d5..c8238008021 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -1,13 +1,13 @@ /*------------------------------------------------------------------------- * * rel.h - * POSTGRES relation descriptor definitions. + * POSTGRES relation descriptor (a/k/a relcache entry) definitions. * * * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: rel.h,v 1.33 2000/01/26 05:58:38 momjian Exp $ + * $Id: rel.h,v 1.34 2000/01/31 04:35:57 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -21,6 +21,9 @@ #include "rewrite/prs2lock.h" #include "storage/fd.h" +/* added to prevent circular dependency. bjm 1999/11/15 */ +extern char *get_temp_rel_by_physicalname(const char *relname); + /* * LockRelId and LockInfo really belong to lmgr.h, but it's more convenient * to declare them here so we can have a LockInfoData field in a Relation. @@ -39,6 +42,10 @@ typedef struct LockInfoData typedef LockInfoData *LockInfo; +/* + * Likewise, this struct really belongs to trigger.h, but for convenience + * we put it here. + */ typedef struct Trigger { @@ -58,6 +65,7 @@ typedef struct Trigger typedef struct TriggerDesc { + /* index data to identify which triggers are which */ uint16 n_before_statement[4]; uint16 n_before_row[4]; uint16 n_after_row[4]; @@ -66,9 +74,14 @@ typedef struct TriggerDesc Trigger **tg_before_row[4]; Trigger **tg_after_row[4]; Trigger **tg_after_statement[4]; + /* the actual array of triggers is here */ Trigger *triggers; + int numtriggers; } TriggerDesc; +/* + * Here are the contents of a relation cache entry. + */ typedef struct RelationData { @@ -87,7 +100,7 @@ typedef struct RelationData RuleLock *rd_rules; /* rewrite rules */ IndexStrategy rd_istrat; RegProcedure *rd_support; - TriggerDesc *trigdesc; + TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */ } RelationData; typedef RelationData *Relation; @@ -111,15 +124,6 @@ typedef Relation *RelationPtr; #define InvalidRelation ((Relation) NULL) /* - * RelationGetSystemPort - * Returns system port of a relation. - * - * Note: - * Assumes relation descriptor is valid. - */ -#define RelationGetSystemPort(relation) ((relation)->rd_fd) - -/* * RelationHasReferenceCountZero * True iff relation reference count is zero. * @@ -149,7 +153,7 @@ typedef Relation *RelationPtr; /* * RelationGetForm - * Returns relation attribute values for a relation. + * Returns pg_class tuple for a relation. * * Note: * Assumes relation descriptor is valid. @@ -159,15 +163,14 @@ typedef Relation *RelationPtr; /* * RelationGetRelid * - * returns the object id of the relation - * + * returns the OID of the relation */ #define RelationGetRelid(relation) ((relation)->rd_id) /* * RelationGetFile * - * Returns the open File decscriptor + * Returns the open file descriptor for the rel */ #define RelationGetFile(relation) ((relation)->rd_fd) @@ -176,8 +179,6 @@ typedef Relation *RelationPtr; * * Returns a Relation Name */ -/* added to prevent circular dependency. bjm 1999/11/15 */ -char *get_temp_rel_by_physicalname(const char *relname); #define RelationGetRelationName(relation) \ (\ (strncmp(RelationGetPhysicalRelationName(relation), \ @@ -210,10 +211,19 @@ char *get_temp_rel_by_physicalname(const char *relname); */ #define RelationGetDescr(relation) ((relation)->rd_att) +/* + * RelationGetIndexStrategy + * Returns index strategy for a relation. + * + * Note: + * Assumes relation descriptor is valid. + * Assumes relation descriptor is for an index relation. + */ +#define RelationGetIndexStrategy(relation) ((relation)->rd_istrat) -extern IndexStrategy RelationGetIndexStrategy(Relation relation); -extern void RelationSetIndexSupport(Relation relation, IndexStrategy strategy, - RegProcedure *support); +extern void RelationSetIndexSupport(Relation relation, + IndexStrategy strategy, + RegProcedure *support); #endif /* REL_H */ |