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sequence to be reset to its original starting value. This requires adding the original start value to the set of parameters (columns) of a sequence object, which is a user-visible change with potential compatibility implications; it also forces initdb. Also add hopefully-SQL-compatible RESTART/CONTINUE IDENTITY options to TRUNCATE TABLE. RESTART IDENTITY executes ALTER SEQUENCE RESTART for all sequences "owned by" any of the truncated relations. CONTINUE IDENTITY is a no-op option. Zoltan Boszormenyi
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* sequence.h
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* prototypes for sequence.c.
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*
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/commands/sequence.h,v 1.41 2008/05/16 23:36:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SEQUENCE_H
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#define SEQUENCE_H
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#include "nodes/parsenodes.h"
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#include "storage/relfilenode.h"
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#include "access/xlog.h"
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#include "fmgr.h"
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/*
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* On a machine with no 64-bit-int C datatype, sizeof(int64) will not be 8,
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* but we need this struct type to line up with the way that a sequence
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* table is defined --- and pg_type will say that int8 is 8 bytes anyway.
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* So, we need padding. Ugly but necessary.
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*/
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typedef struct FormData_pg_sequence
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{
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NameData sequence_name;
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#ifndef INT64_IS_BUSTED
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int64 last_value;
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int64 start_value;
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int64 increment_by;
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int64 max_value;
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int64 min_value;
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int64 cache_value;
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int64 log_cnt;
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#else
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int32 last_value;
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int32 pad1;
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int32 start_value;
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int32 pad2;
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int32 increment_by;
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int32 pad3;
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int32 max_value;
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int32 pad4;
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int32 min_value;
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int32 pad5;
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int32 cache_value;
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int32 pad6;
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int32 log_cnt;
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int32 pad7;
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#endif
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bool is_cycled;
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bool is_called;
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} FormData_pg_sequence;
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typedef FormData_pg_sequence *Form_pg_sequence;
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/*
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* Columns of a sequence relation
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*/
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#define SEQ_COL_NAME 1
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#define SEQ_COL_LASTVAL 2
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#define SEQ_COL_STARTVAL 3
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#define SEQ_COL_INCBY 4
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#define SEQ_COL_MAXVALUE 5
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#define SEQ_COL_MINVALUE 6
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#define SEQ_COL_CACHE 7
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#define SEQ_COL_LOG 8
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#define SEQ_COL_CYCLE 9
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#define SEQ_COL_CALLED 10
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#define SEQ_COL_FIRSTCOL SEQ_COL_NAME
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#define SEQ_COL_LASTCOL SEQ_COL_CALLED
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/* XLOG stuff */
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#define XLOG_SEQ_LOG 0x00
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typedef struct xl_seq_rec
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{
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RelFileNode node;
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/* SEQUENCE TUPLE DATA FOLLOWS AT THE END */
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} xl_seq_rec;
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extern Datum nextval(PG_FUNCTION_ARGS);
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extern Datum nextval_oid(PG_FUNCTION_ARGS);
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extern Datum currval_oid(PG_FUNCTION_ARGS);
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extern Datum setval_oid(PG_FUNCTION_ARGS);
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extern Datum setval3_oid(PG_FUNCTION_ARGS);
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extern Datum lastval(PG_FUNCTION_ARGS);
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extern void DefineSequence(CreateSeqStmt *stmt);
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extern void AlterSequence(AlterSeqStmt *stmt);
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extern void AlterSequenceInternal(Oid relid, List *options);
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extern void seq_redo(XLogRecPtr lsn, XLogRecord *rptr);
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extern void seq_desc(StringInfo buf, uint8 xl_info, char *rec);
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#endif /* SEQUENCE_H */
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