249 lines
7.0 KiB
C
249 lines
7.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* heapam.h--
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* POSTGRES heap access method definitions.
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: heapam.h,v 1.28 1998/02/01 05:38:38 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef HEAPAM_H
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#define HEAPAM_H
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#include <access/tupmacs.h>
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#include <access/htup.h>
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#include <access/relscan.h>
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#include <storage/block.h>
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#include <utils/rel.h>
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/* ----------------------------------------------------------------
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* heap access method statistics
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* ----------------------------------------------------------------
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*/
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typedef struct HeapAccessStatisticsData
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{
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time_t init_global_timestamp; /* time global statistics started */
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time_t local_reset_timestamp; /* last time local reset was done */
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time_t last_request_timestamp; /* last time stats were requested */
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int global_open;
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int global_openr;
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int global_close;
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int global_beginscan;
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int global_rescan;
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int global_endscan;
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int global_getnext;
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int global_fetch;
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int global_insert;
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int global_delete;
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int global_replace;
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int global_markpos;
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int global_restrpos;
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int global_BufferGetRelation;
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int global_RelationIdGetRelation;
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int global_RelationIdGetRelation_Buf;
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int global_RelationNameGetRelation;
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int global_getreldesc;
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int global_heapgettup;
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int global_RelationPutHeapTuple;
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int global_RelationPutLongHeapTuple;
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int local_open;
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int local_openr;
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int local_close;
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int local_beginscan;
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int local_rescan;
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int local_endscan;
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int local_getnext;
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int local_fetch;
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int local_insert;
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int local_delete;
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int local_replace;
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int local_markpos;
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int local_restrpos;
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int local_BufferGetRelation;
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int local_RelationIdGetRelation;
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int local_RelationIdGetRelation_Buf;
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int local_RelationNameGetRelation;
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int local_getreldesc;
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int local_heapgettup;
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int local_RelationPutHeapTuple;
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int local_RelationPutLongHeapTuple;
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} HeapAccessStatisticsData;
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typedef HeapAccessStatisticsData *HeapAccessStatistics;
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#define IncrHeapAccessStat(x) \
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(heap_access_stats == NULL ? 0 : (heap_access_stats->x)++)
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/* ----------------
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* fastgetattr
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*
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* This gets called many times, so we macro the cacheable and NULL
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* lookups, and call noncachegetattr() for the rest.
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*
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* ----------------
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*/
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#define fastgetattr(tup, attnum, tupleDesc, isnull) \
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( \
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AssertMacro((attnum) > 0) ? \
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( \
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((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
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HeapTupleNoNulls(tup) ? \
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( \
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((tupleDesc)->attrs[(attnum)-1]->attcacheoff > 0 || \
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(attnum) == 1) ? \
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( \
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(Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \
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(char *) (tup) + (tup)->t_hoff + \
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( \
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((attnum) != 1) ? \
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(tupleDesc)->attrs[(attnum)-1]->attcacheoff \
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: \
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0 \
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) \
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) \
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) \
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: \
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nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
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) \
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: \
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( \
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att_isnull((attnum)-1, (tup)->t_bits) ? \
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( \
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((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
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(Datum)NULL \
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) \
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: \
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( \
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nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \
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) \
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) \
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) \
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: \
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( \
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(Datum)NULL \
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) \
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)
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/* ----------------
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* heap_getattr
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*
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* Find a particular field in a row represented as a heap tuple.
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* We return a pointer into that heap tuple, which points to the
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* first byte of the value of the field in question.
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*
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* If the field in question has a NULL value, we return a null
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* pointer and return <*isnull> == true. Otherwise, we return
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* <*isnull> == false.
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*
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* <tup> is the pointer to the heap tuple. <attnum> is the attribute
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* number of the column (field) caller wants. <tupleDesc> is a
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* pointer to the structure describing the row and all its fields.
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*
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* Because this macro is often called with constants, it generates
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* compiler warnings about 'left-hand comma expression has no effect.
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*
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* ----------------
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*/
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#define heap_getattr(tup, attnum, tupleDesc, isnull) \
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( \
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AssertMacro((tup) != NULL && \
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(attnum) > FirstLowInvalidHeapAttributeNumber && \
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(attnum) != 0) ? \
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( \
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((attnum) > (int) (tup)->t_natts) ? \
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( \
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((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
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(Datum)NULL \
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) \
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: \
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( \
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((attnum) > 0) ? \
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( \
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fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \
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) \
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: \
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( \
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((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
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((attnum) == SelfItemPointerAttributeNumber) ? \
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( \
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(Datum)((char *)(tup) + \
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heap_sysoffset[-SelfItemPointerAttributeNumber-1]) \
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) \
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: \
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( \
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(Datum)*(unsigned int *) \
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((char *)(tup) + heap_sysoffset[-(attnum)-1]) \
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) \
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) \
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) \
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) \
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: \
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( \
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(Datum)NULL \
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) \
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)
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extern HeapAccessStatistics heap_access_stats; /* in stats.c */
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/* ----------------
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* function prototypes for heap access method
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* ----------------
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*/
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/* heap_create, heap_creatr, and heap_destroy are declared in catalog/heap.h */
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/* heapam.c */
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extern void doinsert(Relation relation, HeapTuple tup);
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extern Relation heap_open(Oid relationId);
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extern Relation heap_openr(char *relationName);
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extern void heap_close(Relation relation);
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extern HeapScanDesc heap_beginscan(Relation relation, int atend,
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bool seeself, unsigned nkeys, ScanKey key);
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extern void heap_rescan(HeapScanDesc sdesc, bool scanFromEnd, ScanKey key);
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extern void heap_endscan(HeapScanDesc sdesc);
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extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw, Buffer *b);
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extern HeapTuple heap_fetch(Relation relation, bool seeself, ItemPointer tid, Buffer *b);
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extern Oid heap_insert(Relation relation, HeapTuple tup);
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extern int heap_delete(Relation relation, ItemPointer tid);
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extern int heap_replace(Relation relation, ItemPointer otid,
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HeapTuple tup);
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extern void heap_markpos(HeapScanDesc sdesc);
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extern void heap_restrpos(HeapScanDesc sdesc);
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/* in common/heaptuple.c */
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extern Size ComputeDataSize(TupleDesc tupleDesc, Datum value[], char nulls[]);
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extern void DataFill(char *data, TupleDesc tupleDesc,
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Datum value[], char nulls[], uint16 *infomask,
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bits8 *bit);
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extern int heap_attisnull(HeapTuple tup, int attnum);
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extern int heap_sysattrlen(AttrNumber attno);
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extern bool heap_sysattrbyval(AttrNumber attno);
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extern Datum heap_getsysattr(HeapTuple tup, Buffer b, int attnum);
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extern Datum nocachegetattr(HeapTuple tup, int attnum,
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TupleDesc att, bool *isnull);
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extern HeapTuple heap_copytuple(HeapTuple tuple);
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extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
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Datum value[], char nulls[]);
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extern HeapTuple heap_modifytuple(HeapTuple tuple, Buffer buffer,
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Relation relation, Datum replValue[], char replNull[], char repl[]);
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HeapTuple heap_addheader(uint32 natts, int structlen, char *structure);
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/* in common/heap/stats.c */
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extern void PrintHeapAccessStatistics(HeapAccessStatistics stats);
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extern void initam(void);
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/* hio.c */
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extern void RelationPutHeapTuple(Relation relation, BlockNumber blockIndex,
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HeapTuple tuple);
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extern void RelationPutHeapTupleAtEnd(Relation relation, HeapTuple tuple);
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#endif /* HEAPAM_H */
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