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/*-------------------------------------------------------------------------
*
* sequence.h
* prototypes for sequence.c.
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/sequence.h,v 1.39 2008/01/01 19:45:57 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SEQUENCE_H
#define SEQUENCE_H
#include "nodes/parsenodes.h"
#include "storage/relfilenode.h"
#include "access/xlog.h"
#include "fmgr.h"
/*
* On a machine with no 64-bit-int C datatype, sizeof(int64) will not be 8,
* but we need this struct type to line up with the way that a sequence
* table is defined --- and pg_type will say that int8 is 8 bytes anyway.
* So, we need padding. Ugly but necessary.
*/
typedef struct FormData_pg_sequence
{
NameData sequence_name;
#ifndef INT64_IS_BUSTED
int64 last_value;
int64 increment_by;
int64 max_value;
int64 min_value;
int64 cache_value;
int64 log_cnt;
#else
int32 last_value;
int32 pad1;
int32 increment_by;
int32 pad2;
int32 max_value;
int32 pad3;
int32 min_value;
int32 pad4;
int32 cache_value;
int32 pad5;
int32 log_cnt;
int32 pad6;
#endif
bool is_cycled;
bool is_called;
} FormData_pg_sequence;
typedef FormData_pg_sequence *Form_pg_sequence;
/*
* Columns of a sequence relation
*/
#define SEQ_COL_NAME 1
#define SEQ_COL_LASTVAL 2
#define SEQ_COL_INCBY 3
#define SEQ_COL_MAXVALUE 4
#define SEQ_COL_MINVALUE 5
#define SEQ_COL_CACHE 6
#define SEQ_COL_LOG 7
#define SEQ_COL_CYCLE 8
#define SEQ_COL_CALLED 9
#define SEQ_COL_FIRSTCOL SEQ_COL_NAME
#define SEQ_COL_LASTCOL SEQ_COL_CALLED
/* XLOG stuff */
#define XLOG_SEQ_LOG 0x00
typedef struct xl_seq_rec
{
RelFileNode node;
/* SEQUENCE TUPLE DATA FOLLOWS AT THE END */
} xl_seq_rec;
extern Datum nextval(PG_FUNCTION_ARGS);
extern Datum nextval_oid(PG_FUNCTION_ARGS);
extern Datum currval_oid(PG_FUNCTION_ARGS);
extern Datum setval_oid(PG_FUNCTION_ARGS);
extern Datum setval3_oid(PG_FUNCTION_ARGS);
extern Datum lastval(PG_FUNCTION_ARGS);
extern void DefineSequence(CreateSeqStmt *stmt);
extern void AlterSequence(AlterSeqStmt *stmt);
extern void seq_redo(XLogRecPtr lsn, XLogRecord *rptr);
extern void seq_desc(StringInfo buf, uint8 xl_info, char *rec);
/* Set the upper and lower bounds of a sequence */
#ifndef INT64_IS_BUSTED
#define SEQ_MAXVALUE INT64CONST(0x7FFFFFFFFFFFFFFF)
#else /* INT64_IS_BUSTED */
#define SEQ_MAXVALUE ((int64) 0x7FFFFFFF)
#endif /* INT64_IS_BUSTED */
#define SEQ_MINVALUE (-SEQ_MAXVALUE)
#endif /* SEQUENCE_H */