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Implement remaining fields of information_schema.sequences view

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Add new function pg_sequence_parameters that returns a sequence's start,
minimum, maximum, increment, and cycle values, and use that in the view.
(bug #5662; design suggestion by Tom Lane)

Also slightly adjust the view's column order and permissions after review of
SQL standard.
This commit is contained in:
Peter Eisentraut
2011-01-02 15:08:08 +02:00
parent e657b55e66
commit 39b8843296
8 changed files with 92 additions and 14 deletions
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51
src/backend/commands/sequence.c
View File

@ -24,6 +24,7 @@
#include "commands/defrem.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "storage/bufmgr.h"
@ -1420,6 +1421,56 @@ process_owned_by(Relation seqrel, List *owned_by)
}
/*
* Return sequence parameters, for use by information schema
*/
Datum
pg_sequence_parameters(PG_FUNCTION_ARGS)
{
Oid relid = PG_GETARG_OID(0);
TupleDesc tupdesc;
Datum values[5];
bool isnull[5];
SeqTable elm;
Relation seqrel;
Buffer buf;
Form_pg_sequence seq;
/* open and AccessShareLock sequence */
init_sequence(relid, &elm, &seqrel);
if (pg_class_aclcheck(relid, GetUserId(), ACL_SELECT | ACL_UPDATE | ACL_USAGE) != ACLCHECK_OK)
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied for sequence %s",
RelationGetRelationName(seqrel))));
tupdesc = CreateTemplateTupleDesc(5, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "start_value", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "minimum_value", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "maximum_value", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "increment", INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "cycle_option", BOOLOID, -1, 0);
BlessTupleDesc(tupdesc);
memset(isnull, 0, sizeof(isnull));
seq = read_info(elm, seqrel, &buf);
values[0] = Int64GetDatum(seq->start_value);
values[1] = Int64GetDatum(seq->min_value);
values[2] = Int64GetDatum(seq->max_value);
values[3] = Int64GetDatum(seq->increment_by);
values[4] = BoolGetDatum(seq->is_cycled);
UnlockReleaseBuffer(buf);
relation_close(seqrel, NoLock);
return HeapTupleGetDatum(heap_form_tuple(tupdesc, values, isnull));
}
void
seq_redo(XLogRecPtr lsn, XLogRecord *record)
{