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/*-------------------------------------------------------------------------
*
* heapam.h--
* POSTGRES heap access method definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: heapam.h,v 1.25 1998/01/27 15:35:18 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef HEAPAM_H
#define HEAPAM_H
#include <access/htup.h>
#include <access/relscan.h>
#include <storage/block.h>
#include <utils/rel.h>
/* ----------------------------------------------------------------
* heap access method statistics
* ----------------------------------------------------------------
*/
typedef struct HeapAccessStatisticsData
{
time_t init_global_timestamp; /* time global statistics started */
time_t local_reset_timestamp; /* last time local reset was done */
time_t last_request_timestamp; /* last time stats were requested */
int global_open;
int global_openr;
int global_close;
int global_beginscan;
int global_rescan;
int global_endscan;
int global_getnext;
int global_fetch;
int global_insert;
int global_delete;
int global_replace;
int global_markpos;
int global_restrpos;
int global_BufferGetRelation;
int global_RelationIdGetRelation;
int global_RelationIdGetRelation_Buf;
int global_RelationNameGetRelation;
int global_getreldesc;
int global_heapgettup;
int global_RelationPutHeapTuple;
int global_RelationPutLongHeapTuple;
int local_open;
int local_openr;
int local_close;
int local_beginscan;
int local_rescan;
int local_endscan;
int local_getnext;
int local_fetch;
int local_insert;
int local_delete;
int local_replace;
int local_markpos;
int local_restrpos;
int local_BufferGetRelation;
int local_RelationIdGetRelation;
int local_RelationIdGetRelation_Buf;
int local_RelationNameGetRelation;
int local_getreldesc;
int local_heapgettup;
int local_RelationPutHeapTuple;
int local_RelationPutLongHeapTuple;
} HeapAccessStatisticsData;
typedef HeapAccessStatisticsData *HeapAccessStatistics;
#define IncrHeapAccessStat(x) \
(heap_access_stats == NULL ? 0 : (heap_access_stats->x)++)
/* ----------------
* heap_getattr
*
* Find a particular field in a row represented as a heap tuple.
* We return a pointer into that heap tuple, which points to the
* first byte of the value of the field in question.
*
* If the field in question has a NULL value, we return a null
* pointer and return <*isnull> == true. Otherwise, we return
* <*isnull> == false.
*
* <tup> is the pointer to the heap tuple. <attnum> is the attribute
* number of the column (field) caller wants. <tupleDesc> is a
* pointer to the structure describing the row and all its fields.
*
* Because this macro is often called with constants, it generates
* compiler warnings about 'left-hand comma expression has no effect.
*
* ---------------- */
#define heap_getattr(tup, b, attnum, tupleDesc, isnull) \
(AssertMacro((tup) != NULL) ? \
((attnum) > (int) (tup)->t_natts) ? \
(((isnull) ? (*(isnull) = true) : dummyretNULL), (Datum)NULL) : \
((attnum) > 0) ? \
fastgetattr((tup), (attnum), (tupleDesc), (isnull)) : \
(((isnull) ? (*(isnull) = false) : dummyretNULL), heap_getsysattr((tup), (b), (attnum))) : \
(Datum)NULL)
extern HeapAccessStatistics heap_access_stats; /* in stats.c */
/* ----------------
* function prototypes for heap access method
* ----------------
*/
/* heap_create, heap_creatr, and heap_destroy are declared in catalog/heap.h */
/* heapam.c */
extern void doinsert(Relation relation, HeapTuple tup);
extern Relation heap_open(Oid relationId);
extern Relation heap_openr(char *relationName);
extern void heap_close(Relation relation);
extern HeapScanDesc heap_beginscan(Relation relation, int atend,
bool seeself, unsigned nkeys, ScanKey key);
extern void heap_rescan(HeapScanDesc sdesc, bool scanFromEnd, ScanKey key);
extern void heap_endscan(HeapScanDesc sdesc);
extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw, Buffer *b);
extern HeapTuple heap_fetch(Relation relation, bool seeself, ItemPointer tid, Buffer *b);
extern Oid heap_insert(Relation relation, HeapTuple tup);
extern int heap_delete(Relation relation, ItemPointer tid);
extern int heap_replace(Relation relation, ItemPointer otid,
HeapTuple tup);
extern void heap_markpos(HeapScanDesc sdesc);
extern void heap_restrpos(HeapScanDesc sdesc);
/* in common/heaptuple.c */
extern Size ComputeDataSize(TupleDesc tupleDesc, Datum value[], char nulls[]);
extern void DataFill(char *data, TupleDesc tupleDesc,
Datum value[], char nulls[], uint16 *infomask,
bits8 *bit);
extern int heap_attisnull(HeapTuple tup, int attnum);
extern int heap_sysattrlen(AttrNumber attno);
extern bool heap_sysattrbyval(AttrNumber attno);
extern Datum heap_getsysattr(HeapTuple tup, Buffer b, int attnum);
extern Datum fastgetattr(HeapTuple tup, int attnum,
TupleDesc att, bool *isnull);
extern HeapTuple heap_copytuple(HeapTuple tuple);
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
Datum value[], char nulls[]);
extern HeapTuple heap_modifytuple(HeapTuple tuple, Buffer buffer,
Relation relation, Datum replValue[], char replNull[], char repl[]);
HeapTuple heap_addheader(uint32 natts, int structlen, char *structure);
/* in common/heap/stats.c */
extern void PrintHeapAccessStatistics(HeapAccessStatistics stats);
extern void initam(void);
/* hio.c */
extern void RelationPutHeapTuple(Relation relation, BlockNumber blockIndex,
HeapTuple tuple);
extern void RelationPutHeapTupleAtEnd(Relation relation, HeapTuple tuple);
#endif /* HEAPAM_H */
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