* POSTGRES heap access method definitions.
*
*
- * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
+ * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: heapam.h,v 1.59 2000/11/30 18:38:46 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.91 2004/08/29 04:13:03 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef HEAPAM_H
#define HEAPAM_H
-#include <time.h>
#include "access/htup.h"
#include "access/relscan.h"
+#include "access/sdir.h"
#include "access/tupmacs.h"
#include "access/xlogutils.h"
+#include "nodes/primnodes.h"
#include "storage/block.h"
#include "storage/lmgr.h"
#include "utils/rel.h"
#include "utils/tqual.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_mark4update;
- 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_mark4update;
- 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)++)
-
/* ----------------
* fastgetattr
*
- * This gets called many times, so we macro the cacheable and NULL
- * lookups, and call noncachegetattr() for the rest.
+ * Fetch a user attribute's value as a Datum (might be either a
+ * value, or a pointer into the data area of the tuple).
*
+ * This must not be used when a system attribute might be requested.
+ * Furthermore, the passed attnum MUST be valid. Use heap_getattr()
+ * instead, if in doubt.
+ *
+ * This gets called many times, so we macro the cacheable and NULL
+ * lookups, and call nocachegetattr() for the rest.
* ----------------
*/
( \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff >= 0 ? \
( \
- (Datum) fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \
+ fetchatt((tupleDesc)->attrs[(attnum)-1], \
(char *) (tup)->t_data + (tup)->t_data->t_hoff + \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff) \
) \
) \
)
-#else /* defined(DISABLE_COMPLEX_MACRO) */
+#else /* defined(DISABLE_COMPLEX_MACRO) */
-extern Datum
-fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
+extern Datum fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
bool *isnull);
-
-#endif /* defined(DISABLE_COMPLEX_MACRO) */
+#endif /* defined(DISABLE_COMPLEX_MACRO) */
/* ----------------
* 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.
+ * Extract an attribute of a heap tuple and return it as a Datum.
+ * This works for either system or user attributes. The given attnum
+ * is properly range-checked.
*
- * If the field in question has a NULL value, we return a null
- * pointer and return <*isnull> == true. Otherwise, we return
- * <*isnull> == false.
+ * If the field in question has a NULL value, we return a zero Datum
+ * and set *isnull == true. Otherwise, we set *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, attnum, tupleDesc, isnull) \
( \
- AssertMacro((tup) != NULL && \
- (attnum) > FirstLowInvalidHeapAttributeNumber && \
- (attnum) != 0), \
- ((attnum) > (int) (tup)->t_data->t_natts) ? \
- ( \
- ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
- (Datum)NULL \
- ) \
- : \
+ AssertMacro((tup) != NULL), \
( \
((attnum) > 0) ? \
( \
- fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \
- ) \
- : \
- ( \
- ((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
- ((attnum) == SelfItemPointerAttributeNumber) ? \
+ ((attnum) > (int) (tup)->t_data->t_natts) ? \
( \
- (Datum)((char *)&((tup)->t_self)) \
+ ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
+ (Datum)NULL \
) \
: \
- (((attnum) == TableOidAttributeNumber) ? \
- ( \
- (Datum)((tup)->t_tableOid) \
- ) \
- : \
- ( \
- (Datum)*(unsigned int *) \
- ((char *)(tup)->t_data + heap_sysoffset[-(attnum)-1]) \
- )) \
+ fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
+ : \
+ heap_getsysattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
)
-extern HeapAccessStatistics heap_access_stats; /* in stats.c */
+extern Datum heap_getsysattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
+ bool *isnull);
+
/* ----------------
* function prototypes for heap access method
/* heapam.c */
+extern Relation relation_open(Oid relationId, LOCKMODE lockmode);
+extern Relation conditional_relation_open(Oid relationId, LOCKMODE lockmode, bool nowait);
+extern Relation relation_openrv(const RangeVar *relation, LOCKMODE lockmode);
+extern Relation relation_openr(const char *sysRelationName, LOCKMODE lockmode);
+extern void relation_close(Relation relation, LOCKMODE lockmode);
+
extern Relation heap_open(Oid relationId, LOCKMODE lockmode);
-extern Relation heap_openr(const char *relationName, LOCKMODE lockmode);
-extern Relation heap_open_nofail(Oid relationId);
-extern Relation heap_openr_nofail(const char *relationName);
-extern void heap_close(Relation relation, LOCKMODE lockmode);
-extern HeapScanDesc heap_beginscan(Relation relation, int atend,
- Snapshot snapshot, unsigned nkeys, ScanKey key);
-extern void heap_rescan(HeapScanDesc scan, bool scanFromEnd, ScanKey key);
+extern Relation heap_openrv(const RangeVar *relation, LOCKMODE lockmode);
+extern Relation heap_openr(const char *sysRelationName, LOCKMODE lockmode);
+
+#define heap_close(r,l) relation_close(r,l)
+
+extern HeapScanDesc heap_beginscan(Relation relation, Snapshot snapshot,
+ int nkeys, ScanKey key);
+extern void heap_rescan(HeapScanDesc scan, ScanKey key);
extern void heap_endscan(HeapScanDesc scan);
-extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw);
-extern void heap_fetch(Relation relation, Snapshot snapshot, HeapTuple tup, Buffer *userbuf);
-extern ItemPointer heap_get_latest_tid(Relation relation, Snapshot snapshot, ItemPointer tid);
-extern Oid heap_insert(Relation relation, HeapTuple tup);
-extern int heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid);
+extern HeapTuple heap_getnext(HeapScanDesc scan, ScanDirection direction);
+
+extern bool heap_fetch(Relation relation, Snapshot snapshot,
+ HeapTuple tuple, Buffer *userbuf, bool keep_buf,
+ PgStat_Info *pgstat_info);
+extern bool heap_release_fetch(Relation relation, Snapshot snapshot,
+ HeapTuple tuple, Buffer *userbuf, bool keep_buf,
+ PgStat_Info *pgstat_info);
+
+extern ItemPointer heap_get_latest_tid(Relation relation, Snapshot snapshot,
+ ItemPointer tid);
+extern void setLastTid(const ItemPointer tid);
+
+extern Oid heap_insert(Relation relation, HeapTuple tup, CommandId cid);
+extern int heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid,
+ CommandId cid, Snapshot crosscheck, bool wait);
extern int heap_update(Relation relation, ItemPointer otid, HeapTuple tup,
- ItemPointer ctid);
-extern int heap_mark4update(Relation relation, HeapTuple tup, Buffer *userbuf);
+ ItemPointer ctid, CommandId cid, Snapshot crosscheck, bool wait);
+extern int heap_mark4update(Relation relation, HeapTuple tup,
+ Buffer *userbuf, CommandId cid);
+
+extern Oid simple_heap_insert(Relation relation, HeapTuple tup);
+extern void simple_heap_delete(Relation relation, ItemPointer tid);
+extern void simple_heap_update(Relation relation, ItemPointer otid,
+ HeapTuple tup);
+
extern void heap_markpos(HeapScanDesc scan);
extern void heap_restrpos(HeapScanDesc scan);
extern void heap_redo(XLogRecPtr lsn, XLogRecord *rptr);
extern void heap_undo(XLogRecPtr lsn, XLogRecord *rptr);
-extern void heap_desc(char *buf, uint8 xl_info, char* rec);
+extern void heap_desc(char *buf, uint8 xl_info, char *rec);
+extern XLogRecPtr log_heap_clean(Relation reln, Buffer buffer,
+ OffsetNumber *unused, int uncnt);
+extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf,
+ ItemPointerData from,
+ Buffer newbuf, HeapTuple newtup);
/* in common/heaptuple.c */
-extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *value, char *nulls);
+extern Size ComputeDataSize(TupleDesc tupleDesc, Datum *values, char *nulls);
extern void DataFill(char *data, TupleDesc tupleDesc,
- Datum *value, char *nulls, uint16 *infomask,
+ Datum *values, 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 nocachegetattr(HeapTuple tup, int attnum,
TupleDesc att, bool *isnull);
extern HeapTuple heap_copytuple(HeapTuple tuple);
extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
- Datum *value, char *nulls);
+ Datum *values, char *nulls);
extern HeapTuple heap_modifytuple(HeapTuple tuple,
- Relation relation, Datum *replValue, char *replNull, char *repl);
+ Relation relation,
+ Datum *replValues,
+ char *replNulls,
+ char *replActions);
+extern void heap_deformtuple(HeapTuple tuple, TupleDesc tupleDesc,
+ Datum *values, char *nulls);
extern void heap_freetuple(HeapTuple tuple);
-HeapTuple heap_addheader(uint32 natts, int structlen, char *structure);
-
-/* in common/heap/stats.c */
-extern void PrintHeapAccessStatistics(HeapAccessStatistics stats);
-extern void initam(void);
+extern HeapTuple heap_addheader(int natts, bool withoid, Size structlen, void *structure);
-#endif /* HEAPAM_H */
+#endif /* HEAPAM_H */
OSDN Git Service
