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Add a RESTART (without parameter) option to ALTER SEQUENCE, allowing a

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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
This commit is contained in:
Tom Lane
2008-05-16 23:36:05 +00:00
parent 8a2f5d221b
commit 10a3471bed
18 changed files with 513 additions and 106 deletions
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83
src/bin/pg_dump/pg_dump.c
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@@ -12,7 +12,7 @@
* by PostgreSQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.491 2008/05/12 00:00:53 alvherre Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.492 2008/05/16 23:36:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -9525,7 +9525,8 @@ static void
dumpSequence(Archive *fout, TableInfo *tbinfo)
{
PGresult *res;
char *last,
char *startv,
*last,
*incby,
*maxv = NULL,
*minv = NULL,
@@ -9543,19 +9544,40 @@ dumpSequence(Archive *fout, TableInfo *tbinfo)
snprintf(bufm, sizeof(bufm), INT64_FORMAT, SEQ_MINVALUE);
snprintf(bufx, sizeof(bufx), INT64_FORMAT, SEQ_MAXVALUE);
appendPQExpBuffer(query,
"SELECT sequence_name, last_value, increment_by, "
"CASE WHEN increment_by > 0 AND max_value = %s THEN NULL "
" WHEN increment_by < 0 AND max_value = -1 THEN NULL "
" ELSE max_value "
"END AS max_value, "
"CASE WHEN increment_by > 0 AND min_value = 1 THEN NULL "
" WHEN increment_by < 0 AND min_value = %s THEN NULL "
" ELSE min_value "
"END AS min_value, "
"cache_value, is_cycled, is_called from %s",
bufx, bufm,
fmtId(tbinfo->dobj.name));
if (g_fout->remoteVersion >= 80400)
{
appendPQExpBuffer(query,
"SELECT sequence_name, "
"start_value, last_value, increment_by, "
"CASE WHEN increment_by > 0 AND max_value = %s THEN NULL "
" WHEN increment_by < 0 AND max_value = -1 THEN NULL "
" ELSE max_value "
"END AS max_value, "
"CASE WHEN increment_by > 0 AND min_value = 1 THEN NULL "
" WHEN increment_by < 0 AND min_value = %s THEN NULL "
" ELSE min_value "
"END AS min_value, "
"cache_value, is_cycled, is_called from %s",
bufx, bufm,
fmtId(tbinfo->dobj.name));
}
else
{
appendPQExpBuffer(query,
"SELECT sequence_name, "
"0 as start_value, last_value, increment_by, "
"CASE WHEN increment_by > 0 AND max_value = %s THEN NULL "
" WHEN increment_by < 0 AND max_value = -1 THEN NULL "
" ELSE max_value "
"END AS max_value, "
"CASE WHEN increment_by > 0 AND min_value = 1 THEN NULL "
" WHEN increment_by < 0 AND min_value = %s THEN NULL "
" ELSE min_value "
"END AS min_value, "
"cache_value, is_cycled, is_called from %s",
bufx, bufm,
fmtId(tbinfo->dobj.name));
}
res = PQexec(g_conn, query->data);
check_sql_result(res, g_conn, query->data, PGRES_TUPLES_OK);
@@ -9577,15 +9599,16 @@ dumpSequence(Archive *fout, TableInfo *tbinfo)
}
#endif
last = PQgetvalue(res, 0, 1);
incby = PQgetvalue(res, 0, 2);
if (!PQgetisnull(res, 0, 3))
maxv = PQgetvalue(res, 0, 3);
startv = PQgetvalue(res, 0, 1);
last = PQgetvalue(res, 0, 2);
incby = PQgetvalue(res, 0, 3);
if (!PQgetisnull(res, 0, 4))
minv = PQgetvalue(res, 0, 4);
cache = PQgetvalue(res, 0, 5);
cycled = (strcmp(PQgetvalue(res, 0, 6), "t") == 0);
called = (strcmp(PQgetvalue(res, 0, 7), "t") == 0);
maxv = PQgetvalue(res, 0, 4);
if (!PQgetisnull(res, 0, 5))
minv = PQgetvalue(res, 0, 5);
cache = PQgetvalue(res, 0, 6);
cycled = (strcmp(PQgetvalue(res, 0, 7), "t") == 0);
called = (strcmp(PQgetvalue(res, 0, 8), "t") == 0);
/*
* The logic we use for restoring sequences is as follows:
@@ -9615,8 +9638,18 @@ dumpSequence(Archive *fout, TableInfo *tbinfo)
"CREATE SEQUENCE %s\n",
fmtId(tbinfo->dobj.name));
if (!called)
appendPQExpBuffer(query, " START WITH %s\n", last);
if (g_fout->remoteVersion >= 80400)
appendPQExpBuffer(query, " START WITH %s\n", startv);
else
{
/*
* Versions before 8.4 did not remember the true start value. If
* is_called is false then the sequence has never been incremented
* so we can use last_val. Otherwise punt and let it default.
*/
if (!called)
appendPQExpBuffer(query, " START WITH %s\n", last);
}
appendPQExpBuffer(query, " INCREMENT BY %s\n", incby);