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Here is 4 file in tgz:

Browse Source 
the new timetravel.c,
new timetravel.README (cut from spi/README and modified),
modified timetravel.sql.in
and modified timetravel.example.

Features:
- optionally 3 parameter for insert/update/delete user name

- work with CREATE UNIQUE INDEX ixxx on table xxx
(unique_field,time_off);
    (the  original version was work with unique index on 6.5.0-6.5.3,
and not work on 7.3.2,7.3.3)
     (before 6.5.0 and between 6.5.3 and 7.3.2 I dont know)

- get_timetravel(tablename) function for check timetravel-status.

- timetravel trigger not change  oid of the active record. (it is not a
good feature, because the  old version is automatice prevent the paralel
update with "where oid=nnn")

B?jthe Zolt?n
WIN32_DEV
Bruce Momjian 22 years ago
parent 38fb906f93
commit 524cfad23f
5 changed files with 432 additions and 209 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 4
      contrib/oid2name/oid2name.c
  2. 116
      contrib/spi/README.timetravel
  3. 497
      contrib/spi/timetravel.c
  4. 17
      contrib/spi/timetravel.example
  5. 7
      contrib/spi/timetravel.sql.in

4
contrib/oid2name/oid2name.c
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@ -355,7 +355,9 @@ sql_exec_dumptable(PGconn *conn, int systables)
if (systables == 1)
snprintf(todo, 1024, "select relfilenode,relname from pg_class order by relname");
else
snprintf(todo, 1024, "select relfilenode,relname from pg_class where relname not like 'pg_%%' order by relname");
snprintf(todo, 1024, "select relfilenode,relname from pg_class "
"where reltype not in ('v','c') and "
"relname not like 'pg_%%' order by relname");
sql_exec(conn, todo, 0);
}

116
contrib/spi/README.timetravel
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@ -0,0 +1,116 @@
2. timetravel.c - functions for implementing time travel feature.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I rewritten this, because:
on original version of postgresql 7.3.2-7.3.3:
the UPDATE not work on timetravel.example if I added
>create unique index tttest_idx on tttest (price_id,price_off);
>update tttest set price_val = 30 where price_id = 3;
ERROR: Cannot insert a duplicate key into unique index tttest_idx
And UPDATE not work on table tttest after
>alter table tttest add column q1 text;
>alter table tttest add column q2 int;
>alter table tttest drop column q1;
>update tttest set price_val = 30 where price_id = 3;
ERROR: Parameter '$5' is out of range
And I add a new optional feature: my new timetravel have +3 optional parameters:
inserter_user, updater_user, deleter_user.
And I add a new function: get_timetravel for get timetravel status
without change it.
A big difference:
the old version on UPDATE changed oid on active ('infinity') record,
the new version UPDATE keep oid, and the overdued record have a new oid.
I sign with '!!!' my comment in this file.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Old internally supported time-travel (TT) used insert/delete
transaction commit times. To get the same feature using triggers
you are to add to a table two columns of abstime type to store
date when a tuple was inserted (start_date) and changed/deleted
(stop_date):
CREATE TABLE XXX (
... ...
date_on abstime default currabstime(),
date_off abstime default 'infinity'
... ...
/* !!! and (if have) */
ins_user text /* user, who insert this record */
upd_user text /* user, who updated this record */
del_user text /* user, who deleted this record */
... ...
);
!!! on INSERT my new version:
... and optionally set ins_user to current user, upd_user and del_user to null.
- so, tuples being inserted with NULLs in date_on/date_off will get
_current_date_ in date_on (name of start_date column in XXX) and INFINITY in
date_off (name of stop_date column in XXX).
Tuples with stop_date equal INFINITY are "valid now": when trigger will
be fired for UPDATE/DELETE of a tuple with stop_date NOT equal INFINITY then
this tuple will not be changed/deleted!
If stop_date equal INFINITY then on
UPDATE:
original version was:
only stop_date in tuple being updated will be changed to current
date and new tuple with new data (coming from SET ... in UPDATE) will be
inserted. Start_date in this new tuple will be setted to current date and
stop_date - to INFINITY.
On my new version:
insert a new tuple with old values, but stop_date changed to current date;
and update original tuple with new data, and update start_date to current date
and optionally set upd_user to current user and clear ins_user,del_user.
DELETE: new tuple will be inserted with stop_date setted to current date
(and with the same data in other columns as in tuple being deleted).
On my new version:
... and optionally set del_user to current user.
NOTE:
1. To get tuples "valid now" you are to add _stop_date_ = 'infinity'
to WHERE. Internally supported TT allowed to avoid this...
Fixed rewriting RULEs could help here...
As work arround you may use VIEWs...
2. You can't change start/stop date columns with UPDATE!
Use set_timetravel (below) if you need in this.
FUNCTIONs:
timetravel() is general trigger function.
You are to create trigger BEFORE UPDATE OR DELETE using this
function on a time-traveled table. You are to specify two arguments: name of
start_date column and name of stop_date column in triggered table.
Or add +3 arguments:
name of insert_user column, name of update_user column, name of delete_user column
currabstime() may be used in DEFAULT for start_date column to get
current date.
!!! I deleted this function, because I newer used this.
set_timetravel() allows you turn time-travel ON/OFF for a table:
set_timetravel('XXX', 1) will turn TT ON for table XXX (and report
old status).
set_timetravel('XXX', 0) will turn TT OFF for table XXX (-"-).
Turning TT OFF allows you do with a table ALL what you want.
get_timetravel() reports time-travel status ON(1)/OFF(0) for a table.
get_timetravel() and set_timetravel() not checking existing of table and
existing of timetravel trigger on specified table.
There is example in timetravel.example.
To CREATE FUNCTIONs use timetravel.sql (will be made by gmake from
timetravel.source).

497
contrib/spi/timetravel.c
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@ -3,13 +3,16 @@
* using general triggers.
*/
/* Modified by BÖJTHE Zoltán, Hungary, mailto:urdesobt@axelero.hu */
#include "executor/spi.h" /* this is what you need to work with SPI */
#include "commands/trigger.h" /* -"- and triggers */
#include <ctype.h>
#include "commands/trigger.h" /* -"- and triggers */
#include "miscadmin.h" /* for GetPgUserName() */
#include <ctype.h> /* tolower () */
#define ABSTIMEOID 702 /* it should be in pg_type.h */
#define ABSTIMEOID 702 /* it should be in pg_type.h */
AbsoluteTime currabstime(void);
/* AbsoluteTime currabstime(void); */
Datum timetravel(PG_FUNCTION_ARGS);
Datum set_timetravel(PG_FUNCTION_ARGS);
@ -22,84 +25,102 @@ typedef struct
static EPlan *Plans = NULL; /* for UPDATE/DELETE */
static int nPlans = 0;
static char **TTOff = NULL;
static int nTTOff = 0;
typedef struct _TTOffList
{
struct _TTOffList *next;
char name[1];
} TTOffList;
static TTOffList TTOff = {NULL,0};
static int findTTStatus(char *name);
static EPlan *find_plan(char *ident, EPlan ** eplan, int *nplans);
/*
* timetravel () --
* 1. IF an update affects tuple with stop_date eq INFINITY
* then form (and return) new tuple with stop_date eq current date
* and all other column values as in old tuple, and insert tuple
* with new data and start_date eq current date and
* stop_date eq INFINITY
* then form (and return) new tuple with start_date eq current date
* and stop_date eq INFINITY [ and update_user eq current user ]
* and all other column values as in new tuple, and insert tuple
* with old data and stop_date eq current date
* ELSE - skip updation of tuple.
* 2. IF an delete affects tuple with stop_date eq INFINITY
* then insert the same tuple with stop_date eq current date
* [ and delete_user eq current user ]
* ELSE - skip deletion of tuple.
* 3. On INSERT, if start_date is NULL then current date will be
* inserted, if stop_date is NULL then INFINITY will be inserted.
* [ and insert_user eq current user, update_user and delete_user
* eq NULL ]
*
* In CREATE TRIGGER you are to specify start_date and stop_date column
* names:
* EXECUTE PROCEDURE
* timetravel ('date_on', 'date_off').
* timetravel ('date_on', 'date_off' [,'insert_user', 'update_user', 'delete_user' ] ).
*/
#define MaxAttrNum 5
#define MinAttrNum 2
#define a_time_on 0
#define a_time_off 1
#define a_ins_user 2
#define a_upd_user 3
#define a_del_user 4
PG_FUNCTION_INFO_V1(timetravel);
Datum
Datum /* have to return HeapTuple to Executor */
timetravel(PG_FUNCTION_ARGS)
{
TriggerData *trigdata = (TriggerData *) fcinfo->context;
Trigger *trigger; /* to get trigger name */
char **args; /* arguments */
int attnum[2]; /* fnumbers of start/stop columns */
Datum oldon,
oldoff;
Datum newon,
newoff;
Datum *cvals; /* column values */
char *cnulls; /* column nulls */
char *relname; /* triggered relation name */
TriggerData *trigdata = (TriggerData *) fcinfo->context;
Trigger *trigger; /* to get trigger name */
int argc;
char **args; /* arguments */
int attnum[MaxAttrNum]; /* fnumbers of start/stop columns */
Datum oldtimeon,
oldtimeoff;
Datum newtimeon,
newtimeoff,
newuser,
nulltext;
Datum *cvals; /* column values */
char *cnulls; /* column nulls */
char *relname; /* triggered relation name */
Relation rel; /* triggered relation */
HeapTuple trigtuple;
HeapTuple newtuple = NULL;
HeapTuple rettuple;
TupleDesc tupdesc; /* tuple description */
int natts; /* # of attributes */
EPlan *plan; /* prepared plan */
int natts; /* # of attributes */
EPlan *plan; /* prepared plan */
char ident[2 * NAMEDATALEN];
bool isnull; /* to know is some column NULL or not */
bool isinsert = false;
int ret;
int i;
int ret;
int i;
/*
* Some checks first...
*/
/* Called by trigger manager ? */
if (!CALLED_AS_TRIGGER(fcinfo))
/* internal error */
if(!CALLED_AS_TRIGGER(fcinfo))
elog(ERROR, "timetravel: not fired by trigger manager");
/* Should be called for ROW trigger */
if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
/* internal error */
if(TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
elog(ERROR, "timetravel: can't process STATEMENT events");
/* Should be called BEFORE */
if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
/* internal error */
if(TRIGGER_FIRED_AFTER(trigdata->tg_event))
elog(ERROR, "timetravel: must be fired before event");
/* INSERT ? */
if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
if(TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
isinsert = true;
if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
if(TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
newtuple = trigdata->tg_newtuple;
trigtuple = trigdata->tg_trigtuple;
@ -108,170 +129,168 @@ timetravel(PG_FUNCTION_ARGS)
relname = SPI_getrelname(rel);
/* check if TT is OFF for this relation */
for (i = 0; i < nTTOff; i++)
if (strcasecmp(TTOff[i], relname) == 0)
break;
if (i < nTTOff) /* OFF - nothing to do */
if(0==findTTStatus(relname))
{
/* OFF - nothing to do */
pfree(relname);
return PointerGetDatum((newtuple != NULL) ? newtuple : trigtuple);
}
trigger = trigdata->tg_trigger;
if (trigger->tgnargs != 2)
/* internal error */
elog(ERROR, "timetravel (%s): invalid (!= 2) number of arguments %d",
relname, trigger->tgnargs);
argc = trigger->tgnargs;
if(argc != MinAttrNum && argc != MaxAttrNum)
elog(ERROR, "timetravel (%s): invalid (!= %d or %d) number of arguments %d",
relname, MinAttrNum, MaxAttrNum, trigger->tgnargs);
args = trigger->tgargs;
tupdesc = rel->rd_att;
natts = tupdesc->natts;
for (i = 0; i < 2; i++)
for(i = 0 ; i < MinAttrNum ; i++)
{
attnum[i] = SPI_fnumber(tupdesc, args[i]);
if (attnum[i] < 0)
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("\"%s\" has no attribute \"%s\"",
relname, args[i])));
if (SPI_gettypeid(tupdesc, attnum[i]) != ABSTIMEOID)
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("attribute \"%s\" of \"%s\" must be type ABSTIME",
args[i], relname)));
if(attnum[i] < 0)
elog(ERROR, "timetravel (%s): there is no attribute %s", relname, args[i]);
if(SPI_gettypeid(tupdesc, attnum[i]) != ABSTIMEOID)
elog(ERROR, "timetravel (%s): attribute %s must be of abstime type",
relname, args[i]);
}
if (isinsert) /* INSERT */
for( ; i < argc ; i++)
{
int chnattrs = 0;
int chattrs[2];
Datum newvals[2];
attnum[i] = SPI_fnumber(tupdesc, args[i]);
if(attnum[i] < 0)
elog(ERROR, "timetravel (%s): there is no attribute %s", relname, args[i]);
if(SPI_gettypeid(tupdesc, attnum[i]) != TEXTOID)
elog(ERROR, "timetravel (%s): attribute %s must be of text type",
relname, args[i]);
}
/* create fields containing name */
newuser = DirectFunctionCall1(textin, CStringGetDatum(GetUserNameFromId(GetUserId())));
nulltext = (Datum)NULL;
oldon = SPI_getbinval(trigtuple, tupdesc, attnum[0], &isnull);
if (isnull)
if(isinsert)
{ /* INSERT */
int chnattrs = 0;
int chattrs[MaxAttrNum];
Datum newvals[MaxAttrNum];
char newnulls[MaxAttrNum];
oldtimeon = SPI_getbinval(trigtuple, tupdesc, attnum[a_time_on], &isnull);
if(isnull)
{
newvals[chnattrs] = GetCurrentAbsoluteTime();
chattrs[chnattrs] = attnum[0];
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_time_on];
chnattrs++;
}
oldoff = SPI_getbinval(trigtuple, tupdesc, attnum[1], &isnull);
if (isnull)
oldtimeoff = SPI_getbinval(trigtuple, tupdesc, attnum[a_time_off], &isnull);
if(isnull)
{
if ((chnattrs == 0 && DatumGetInt32(oldon) >= NOEND_ABSTIME) ||
(chnattrs > 0 && DatumGetInt32(newvals[0]) >= NOEND_ABSTIME))
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("timetravel (%s): %s ge %s",
relname, args[0], args[1])));
if((chnattrs == 0 && DatumGetInt32(oldtimeon) >= NOEND_ABSTIME) ||
(chnattrs > 0 && DatumGetInt32(newvals[a_time_on]) >= NOEND_ABSTIME))
elog(ERROR, "timetravel (%s): %s is infinity", relname, args[a_time_on]);
newvals[chnattrs] = NOEND_ABSTIME;
chattrs[chnattrs] = attnum[1];
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_time_off];
chnattrs++;
}
else
{
if ((chnattrs == 0 && DatumGetInt32(oldon) >=
DatumGetInt32(oldoff)) ||
(chnattrs > 0 && DatumGetInt32(newvals[0]) >=
DatumGetInt32(oldoff)))
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("timetravel (%s): %s ge %s",
relname, args[0], args[1])));
if((chnattrs == 0 && DatumGetInt32(oldtimeon) > DatumGetInt32(oldtimeoff)) ||
(chnattrs > 0 && DatumGetInt32(newvals[a_time_on]) > DatumGetInt32(oldtimeoff)))
elog(ERROR, "timetravel (%s): %s gt %s", relname, args[a_time_on], args[a_time_off]);
}
pfree(relname);
if (chnattrs <= 0)
if(chnattrs <= 0)
return PointerGetDatum(trigtuple);
rettuple = SPI_modifytuple(rel, trigtuple, chnattrs,
chattrs, newvals, NULL);
if(argc == MaxAttrNum)
{
/* clear update_user value */
newvals[chnattrs] = nulltext;
newnulls[chnattrs] = 'n';
chattrs[chnattrs] = attnum[a_upd_user];
chnattrs++;
/* clear delete_user value */
newvals[chnattrs] = nulltext;
newnulls[chnattrs] = 'n';
chattrs[chnattrs] = attnum[a_del_user];
chnattrs++;
/* set insert_user value */
newvals[chnattrs] = newuser;
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_ins_user];
chnattrs++;
}
rettuple = SPI_modifytuple(rel, trigtuple, chnattrs, chattrs, newvals, newnulls);
return PointerGetDatum(rettuple);
/* end of INSERT */
}
oldon = SPI_getbinval(trigtuple, tupdesc, attnum[0], &isnull);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("\"%s\" must be NOT NULL in \"%s\"",
args[0],relname)));
oldoff = SPI_getbinval(trigtuple, tupdesc, attnum[1], &isnull);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("\"%s\" must be NOT NULL in \"%s\"",
args[1],relname)));
/* UPDATE/DELETE: */
oldtimeon = SPI_getbinval(trigtuple, tupdesc, attnum[a_time_on], &isnull);
if(isnull)
elog(ERROR, "timetravel (%s): %s must be NOT NULL", relname, args[a_time_on]);
oldtimeoff = SPI_getbinval(trigtuple, tupdesc, attnum[a_time_off], &isnull);
if(isnull)
elog(ERROR, "timetravel (%s): %s must be NOT NULL", relname, args[a_time_off]);
/*
* If DELETE/UPDATE of tuple with stop_date neq INFINITY then say
* upper Executor to skip operation for this tuple
*/
if (newtuple != NULL) /* UPDATE */
{
newon = SPI_getbinval(newtuple, tupdesc, attnum[0], &isnull);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("\"%s\" must be NOT NULL in \"%s\"",
args[0],relname)));
newoff = SPI_getbinval(newtuple, tupdesc, attnum[1], &isnull);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("\"%s\" must be NOT NULL in \"%s\"",
args[1],relname)));
if (oldon != newon || oldoff != newoff)
ereport(ERROR,
(errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
errmsg("cannot change columns \"%s\" or \"%s\" in \"%s\"",
args[0], args[1], relname),
errhint("Use set_timetravel() instead.")));
if (newoff != NOEND_ABSTIME)
{
pfree(relname); /* allocated in upper executor context */
return PointerGetDatum(NULL);
}
if(newtuple != NULL)
{ /* UPDATE */
newtimeon = SPI_getbinval(newtuple, tupdesc, attnum[a_time_on], &isnull);
if(isnull)
elog(ERROR, "timetravel (%s): %s must be NOT NULL", relname, args[a_time_on]);
newtimeoff = SPI_getbinval(newtuple, tupdesc, attnum[a_time_off], &isnull);
if(isnull)
elog(ERROR, "timetravel (%s): %s must be NOT NULL", relname, args[a_time_off]);
if(oldtimeon != newtimeon || oldtimeoff != newtimeoff)
elog(ERROR, "timetravel (%s): you can't change %s and/or %s columns (use set_timetravel)",
relname, args[a_time_on], args[a_time_off]);
}
else if (oldoff != NOEND_ABSTIME) /* DELETE */
{
if(oldtimeoff != NOEND_ABSTIME)
{ /* current record is a deleted/updated record */
pfree(relname);
return PointerGetDatum(NULL);
}
newoff = GetCurrentAbsoluteTime();
newtimeoff = GetCurrentAbsoluteTime();
/* Connect to SPI manager */
if ((ret = SPI_connect()) < 0)
/* internal error */
if((ret = SPI_connect()) < 0)
elog(ERROR, "timetravel (%s): SPI_connect returned %d", relname, ret);
/* Fetch tuple values and nulls */
cvals = (Datum *) palloc(natts * sizeof(Datum));
cnulls = (char *) palloc(natts * sizeof(char));
for (i = 0; i < natts; i++)
for(i = 0; i < natts; i++)
{
cvals[i] = SPI_getbinval((newtuple != NULL) ? newtuple : trigtuple,
tupdesc, i + 1, &isnull);
cvals[i] = SPI_getbinval(trigtuple, tupdesc, i + 1, &isnull);
cnulls[i] = (isnull) ? 'n' : ' ';
}
/* change date column(s) */
if (newtuple) /* UPDATE */
{
cvals[attnum[0] - 1] = newoff; /* start_date eq current date */
cnulls[attnum[0] - 1] = ' ';
cvals[attnum[1] - 1] = NOEND_ABSTIME; /* stop_date eq INFINITY */
cnulls[attnum[1] - 1] = ' ';
}
else
/* DELETE */
{
cvals[attnum[1] - 1] = newoff; /* stop_date eq current date */
cnulls[attnum[1] - 1] = ' ';
cvals[attnum[a_time_off] - 1] = newtimeoff; /* stop_date eq current date */
cnulls[attnum[a_time_off] - 1] = ' ';
if(!newtuple)
{ /* DELETE */
if(argc == MaxAttrNum)
{
cvals[attnum[a_del_user] - 1] = newuser; /* set delete user */
cnulls[attnum[a_del_user] - 1] = ' ';
}
}
/*
@ -282,11 +301,12 @@ timetravel(PG_FUNCTION_ARGS)
plan = find_plan(ident, &Plans, &nPlans);
/* if there is no plan ... */
if (plan->splan == NULL)
if(plan->splan == NULL)
{
void *pplan;
Oid *ctypes;
char sql[8192];
void *pplan;
Oid *ctypes;
char sql[8192];
int j;
/* allocate ctypes for preparation */
ctypes = (Oid *) palloc(natts * sizeof(Oid));
@ -295,17 +315,21 @@ timetravel(PG_FUNCTION_ARGS)
* Construct query: INSERT INTO _relation_ VALUES ($1, ...)
*/
snprintf(sql, sizeof(sql), "INSERT INTO %s VALUES (", relname);
for (i = 1; i <= natts; i++)
for(i = 1; i <= natts; i++)
{
snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), "$%d%s",
i, (i < natts) ? ", " : ")");
ctypes[i - 1] = SPI_gettypeid(tupdesc, i);
if(!(tupdesc->attrs[i - 1]->attisdropped)) /* skip dropped columns */
snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), "$%d%s",
i, (i < natts) ? ", " : ")" );
// snprintf(sql + strlen(sql), sizeof(sql) - strlen(sql), "$%d /* %d */ %s",
// i, ctypes[i-1], (i < natts) ? ", " : ")" );
}
// elog(NOTICE, "timetravel (%s) update: sql: %s", relname, sql);
/* Prepare plan for query */
pplan = SPI_prepare(sql, natts, ctypes);
if (pplan == NULL)
/* internal error */
if(pplan == NULL)
elog(ERROR, "timetravel (%s): SPI_prepare returned %d", relname, SPI_result);
/*
@ -314,8 +338,7 @@ timetravel(PG_FUNCTION_ARGS)
* use.
*/
pplan = SPI_saveplan(pplan);
if (pplan == NULL)
/* internal error */
if(pplan == NULL)
elog(ERROR, "timetravel (%s): SPI_saveplan returned %d", relname, SPI_result);
plan->splan = pplan;
@ -326,23 +349,54 @@ timetravel(PG_FUNCTION_ARGS)
*/
ret = SPI_execp(plan->splan, cvals, cnulls, 0);
if (ret < 0)
/* internal error */
if(ret < 0)
elog(ERROR, "timetravel (%s): SPI_execp returned %d", relname, ret);
/* Tuple to return to upper Executor ... */
if (newtuple) /* UPDATE */
{
if(newtuple)
{ /* UPDATE */
HeapTuple tmptuple;
int chnattrs = 0;
int chattrs[MaxAttrNum];
Datum newvals[MaxAttrNum];
char newnulls[MaxAttrNum];
newvals[chnattrs] = newtimeoff;
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_time_on];
chnattrs++;
newvals[chnattrs] = NOEND_ABSTIME;
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_time_off];
chnattrs++;
if(argc == MaxAttrNum)
{
/* set update_user value */
newvals[chnattrs] = newuser;
newnulls[chnattrs] = ' ';
chattrs[chnattrs] = attnum[a_upd_user];
chnattrs++;
/* clear delete_user value */
newvals[chnattrs] = nulltext;
newnulls[chnattrs] = 'n';
chattrs[chnattrs] = attnum[a_del_user];
chnattrs++;
/* set insert_user value */
newvals[chnattrs] = nulltext;
newnulls[chnattrs] = 'n';
chattrs[chnattrs] = attnum[a_ins_user];
chnattrs++;
}
tmptuple = SPI_copytuple(trigtuple);
rettuple = SPI_modifytuple(rel, tmptuple, 1, &(attnum[1]), &newoff, NULL);
rettuple = SPI_modifytuple(rel, newtuple, chnattrs, chattrs, newvals, newnulls);
/*
* SPI_copytuple allocates tmptuple in upper executor context -
* have to free allocation using SPI_pfree
*/
SPI_pfree(tmptuple);
// SPI_pfree(tmptuple);
}
else
/* DELETE */
@ -351,7 +405,6 @@ timetravel(PG_FUNCTION_ARGS)
SPI_finish(); /* don't forget say Bye to SPI mgr */
pfree(relname);
return PointerGetDatum(rettuple);
}
@ -364,77 +417,109 @@ PG_FUNCTION_INFO_V1(set_timetravel);
Datum
set_timetravel(PG_FUNCTION_ARGS)
{
Name relname = PG_GETARG_NAME(0);
int32 on = PG_GETARG_INT32(1);
char *rname;
char *d;
char *s;
int i;
for (i = 0; i < nTTOff; i++)
if (namestrcmp(relname, TTOff[i]) == 0)
Name relname = PG_GETARG_NAME(0);
int32 on = PG_GETARG_INT32(1);
char *rname;
char *d;
char *s;
int32 ret;
TTOffList *p,*pp;
for(pp = (p = &TTOff)->next; pp; pp=(p=pp)->next)
{
if(namestrcmp(relname, pp->name) == 0)
break;
if (i < nTTOff) /* OFF currently */
}
if(pp)
{
if (on == 0)
PG_RETURN_INT32(0);
/* turn ON */
free(TTOff[i]);
if (nTTOff == 1)
free(TTOff);
else
/* OFF currently */
if(on != 0)
{
if (i < nTTOff - 1)
memcpy(&(TTOff[i]), &(TTOff[i + 1]), (nTTOff - i) * sizeof(char *));
TTOff = realloc(TTOff, (nTTOff - 1) * sizeof(char *));
/* turn ON */
p->next = pp->next;
free(pp);
}
nTTOff--;
PG_RETURN_INT32(0);
ret = 0;
}
else
{
/* ON currently */
if(on == 0)
{
/* turn OFF */
s = rname = DatumGetCString(DirectFunctionCall1(nameout, NameGetDatum(relname)));
if(s)
{
pp = malloc(sizeof(TTOffList)+strlen(rname));
if(pp)
{
pp->next = NULL;
p->next = pp;
d = pp->name;
while (*s)
*d++ = tolower((unsigned char)*s++);
*d = '\0';
}
pfree(rname);
}
}
ret = 1;
}
PG_RETURN_INT32(ret);
}
/* ON currently */
if (on != 0)
PG_RETURN_INT32(1);
/*
* get_timetravel (relname) --
* get timetravel status for specified relation (ON/OFF)
*/
PG_FUNCTION_INFO_V1(get_timetravel);
/* turn OFF */
if (nTTOff == 0)
TTOff = malloc(sizeof(char *));
else
TTOff = realloc(TTOff, (nTTOff + 1) * sizeof(char *));
s = rname = DatumGetCString(DirectFunctionCall1(nameout,
NameGetDatum(relname)));
d = TTOff[nTTOff] = malloc(strlen(rname) + 1);
while (*s)
*d++ = tolower((unsigned char) *s++);
*d = 0;
pfree(rname);
nTTOff++;
Datum
get_timetravel(PG_FUNCTION_ARGS)
{
Name relname = PG_GETARG_NAME(0);
TTOffList *pp;
for(pp = TTOff.next; pp; pp = pp->next)
{
if(namestrcmp(relname, pp->name) == 0)
PG_RETURN_INT32(0);
}
PG_RETURN_INT32(1);
}
static int
findTTStatus(char *name)
{
TTOffList* pp;
for(pp = TTOff.next; pp; pp = pp->next)
if(strcasecmp(name, pp->name) == 0)
return 0;
return 1;
}
/*
AbsoluteTime
currabstime()
{
return (GetCurrentAbsoluteTime());
}
*/
static EPlan *
find_plan(char *ident, EPlan ** eplan, int *nplans)
{
EPlan *newp;
int i;
EPlan *newp;
int i;
if (*nplans > 0)
if(*nplans > 0)
{
for (i = 0; i < *nplans; i++)
for(i = 0; i < *nplans; i++)
{
if (strcmp((*eplan)[i].ident, ident) == 0)
if(strcmp((*eplan)[i].ident, ident) == 0)
break;
}
if (i != *nplans)
if(i != *nplans)
return (*eplan + i);
*eplan = (EPlan *) realloc(*eplan, (i + 1) * sizeof(EPlan));
newp = *eplan + i;

17
contrib/spi/timetravel.example
Unescape View File

@ -7,6 +7,11 @@ create table tttest (
price_off abstime
);
create unique index tttest_idx on tttest (price_id,price_off);
alter table tttest add column q1 text;
alter table tttest add column q2 int;
alter table tttest drop column q1;
create trigger timetravel
before insert or delete or update on tttest
for each row
@ -17,9 +22,9 @@ insert into tttest values (1, 1, null, null);
insert into tttest(price_id, price_val) values (2, 2);
insert into tttest(price_id, price_val,price_off) values (3, 3, 'infinity');
insert into tttest(price_id, price_val,price_off) values (3, 3,
insert into tttest(price_id, price_val,price_off) values (4, 4,
abstime('now'::timestamp - '100 days'::interval));
insert into tttest(price_id, price_val,price_on) values (3, 3, 'infinity');
insert into tttest(price_id, price_val,price_on) values (3, 3, 'infinity'); -- duplicate key
select * from tttest;
delete from tttest where price_id = 2;
@ -40,6 +45,9 @@ select * from tttest;
-- restore data as before last update:
select set_timetravel('tttest', 0); -- turn TT OFF!
select get_timetravel('tttest'); -- check status
delete from tttest where price_id = 5;
update tttest set price_off = 'infinity' where price_val = 30;
select * from tttest;
@ -51,6 +59,8 @@ select * from tttest;
select set_timetravel('tttest', 1); -- turn TT ON!
select get_timetravel('tttest'); -- check status
-- we want to correct some date
update tttest set price_on = 'Jan-01-1990 00:00:01' where price_id = 5 and
price_off <> 'infinity';
@ -58,6 +68,9 @@ update tttest set price_on = 'Jan-01-1990 00:00:01' where price_id = 5 and
-- try in this way
select set_timetravel('tttest', 0); -- turn TT OFF!
select get_timetravel('tttest'); -- check status
update tttest set price_on = '01-Jan-1990 00:00:01' where price_id = 5 and
price_off <> 'infinity';
select * from tttest;

7
contrib/spi/timetravel.sql.in
Unescape View File

@ -1,6 +1,8 @@
-- Adjust this setting to control where the objects get created.
SET search_path = public;
SET autocommit TO 'on';
CREATE OR REPLACE FUNCTION timetravel()
RETURNS trigger
AS 'MODULE_PATHNAME'
@ -10,3 +12,8 @@ CREATE OR REPLACE FUNCTION set_timetravel(name, int4)
RETURNS int4
AS 'MODULE_PATHNAME'
LANGUAGE 'C' WITH (isStrict);
CREATE OR REPLACE FUNCTION get_timetravel(name)
RETURNS int4
AS 'MODULE_PATHNAME'
LANGUAGE 'C' WITH (isStrict);

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