clock_timestamp() and transcation_timestamp() patch - Mailing list pgsql-hackers

diff -u -r ../postgresql-snapshot/src/backend/utils/adt/nabstime.c
../pgsql/src/backend/utils/adt/nabstime.c
--- ../postgresql-snapshot/src/backend/utils/adt/nabstime.c    2003-05-13
07:08:50.000000000 +0800
+++ ../pgsql/src/backend/utils/adt/nabstime.c    2003-07-15 11:08:06.000000000
+0800
@@ -76,7 +76,6 @@
  * Function prototypes -- internal to this file only
  */

-static AbsoluteTime tm2abstime(struct tm * tm, int tz);
 static void reltime2tm(RelativeTime time, struct tm * tm);
 static int istinterval(char *i_string,
             AbsoluteTime *i_start,
@@ -311,7 +310,7 @@
  * Convert a tm structure to abstime.
  * Note that tm has full year (not 1900-based) and 1-based month.
  */
-static AbsoluteTime
+AbsoluteTime
 tm2abstime(struct tm * tm, int tz)
 {
     int            day;
diff -u -r ../postgresql-snapshot/src/backend/utils/adt/timestamp.c
../pgsql/src/backend/utils/adt/timestamp.c
--- ../postgresql-snapshot/src/backend/utils/adt/timestamp.c    2003-05-13
07:08:50.000000000 +0800
+++ ../pgsql/src/backend/utils/adt/timestamp.c    2003-07-15
20:42:39.000000000 +0800
@@ -847,7 +847,65 @@
     result = AbsoluteTimeUsecToTimestampTz(sec, usec);

     PG_RETURN_TIMESTAMPTZ(result);
-}
+}    /* now() */
+
+/*
+ * Function transaction_timestamp() return current transaction timestamp.
+ * Added by Xiongjian Wang (MikeWang)
+*/
+Datum
+transaction_timestamp(PG_FUNCTION_ARGS)
+{
+    TimestampTz result;
+    AbsoluteTime sec;
+    int            usec;
+
+    sec = GetCurrentTransactionStartTimeUsec(&usec);
+
+    result = AbsoluteTimeUsecToTimestampTz(sec, usec);
+
+    PG_RETURN_TIMESTAMPTZ(result);
+}    /* transaction_timestamp() */
+
+/*
+ * Function clock_timestamp() return current clock timestamp.
+ * Added by Xiongjian Wang (MikeWang)
+*/
+Datum
+clock_timestamp(PG_FUNCTION_ARGS)
+{
+    TimestampTz result;
+    AbsoluteTime sec;
+    int            usec;
+
+    sec = GetCurrentAbsoluteTimeUsec(&usec);
+
+    result = AbsoluteTimeUsecToTimestampTz(sec, usec);
+
+    PG_RETURN_TIMESTAMPTZ(result);
+}    /* clock_timestamp() */
+
+Datum
+transaction_interval(PG_FUNCTION_ARGS)
+{
+    Timestamp trans_tz;
+    Timestamp clock_tz;
+
+    AbsoluteTime trans_sec;
+    AbsoluteTime clock_sec;
+    int trans_usec;
+    int clock_usec;
+
+    clock_sec = GetCurrentAbsoluteTimeUsec(&clock_usec);
+    trans_sec = GetCurrentTransactionStartTimeUsec(&trans_usec);
+
+    trans_tz = AbsoluteTimeUsecToTimestampTz(trans_sec, trans_usec);
+    clock_tz = AbsoluteTimeUsecToTimestampTz(clock_sec, clock_usec);
+
+    return DirectFunctionCall2(timestamp_mi,
+                               TimestampGetDatum(clock_tz),
+                               TimestampGetDatum(trans_tz));
+}    /* transaction_interval() */

 void
 dt2time(Timestamp jd, int *hour, int *min, int *sec, fsec_t *fsec)
diff -u -r ../postgresql-snapshot/src/include/catalog/pg_proc.h
../pgsql/src/include/catalog/pg_proc.h
--- ../postgresql-snapshot/src/include/catalog/pg_proc.h    2003-06-23
06:04:55.000000000 +0800
+++ ../pgsql/src/include/catalog/pg_proc.h    2003-07-15 20:54:06.000000000
+0800
@@ -3394,6 +3394,15 @@
 DATA(insert OID = 2503 (  anyarray_send           PGNSP PGUID 12 f f t f s 1 17
"2277"  anyarray_send - _null_ ));
 DESCR("I/O");

+/* Added by Xiongjian Wang (MikeWang) */
+DATA(insert OID = 5001 (  transaction_timestamp    PGNSP PGUID 12 f f t f s 0
1184 ""  transaction_timestamp - _null_ ));
+DESCR("current transaction timestamp like as function now()");
+
+DATA(insert OID = 5002 (  clock_timestamp PGNSP PGUID 12 f f t f v 0 1184
""  clock_timestamp - _null_ ));
+DESCR("current clock timestamp");
+
+DATA(insert OID = 5003 (  transaction_interval PGNSP PGUID 12 f f t f v 0
1186 ""  transaction_interval - _null_ ));
+DESCR("current transaction runs into present interval");

 /*
  * Symbolic values for provolatile column: these indicate whether the
result
diff -u -r ../postgresql-snapshot/src/include/utils/nabstime.h
../pgsql/src/include/utils/nabstime.h
--- ../postgresql-snapshot/src/include/utils/nabstime.h    2003-05-13
07:08:52.000000000 +0800
+++ ../pgsql/src/include/utils/nabstime.h    2003-07-15 11:06:41.000000000
+0800
@@ -165,5 +165,5 @@
 extern AbsoluteTime GetCurrentAbsoluteTimeUsec(int *usec);
 extern TimestampTz AbsoluteTimeUsecToTimestampTz(AbsoluteTime sec, int
usec);
 extern void abstime2tm(AbsoluteTime time, int *tzp, struct tm * tm, char
**tzn);
-
+extern AbsoluteTime tm2abstime(struct tm * tm, int tz);
 #endif   /* NABSTIME_H */
diff -u -r ../postgresql-snapshot/src/include/utils/timestamp.h
../pgsql/src/include/utils/timestamp.h
--- ../postgresql-snapshot/src/include/utils/timestamp.h    2003-05-13
07:08:52.000000000 +0800
+++ ../pgsql/src/include/utils/timestamp.h    2003-07-15 20:44:35.000000000
+0800
@@ -233,20 +233,24 @@

 extern Datum now(PG_FUNCTION_ARGS);

-/* Internal routines (not fmgr-callable) */
+/* Add by Xiongjian Wang (Mike Wang) */
+extern Datum transaction_timestamp(PG_FUNCTION_ARGS);
+extern Datum clock_timestamp(PG_FUNCTION_ARGS);
+extern Datum transaction_interval(PG_FUNCTION_ARGS);

-extern int    tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, Timestamp
*dt);
+/* Internal routines (not fmgr-callable) */
+extern int tm2timestamp(struct tm * tm, fsec_t fsec, int *tzp, Timestamp
*dt);
 extern int timestamp2tm(Timestamp dt, int *tzp, struct tm * tm,
              fsec_t *fsec, char **tzn);
 extern void dt2time(Timestamp dt, int *hour, int *min, int *sec, fsec_t
*fsec);

-extern int    interval2tm(Interval span, struct tm * tm, fsec_t *fsec);
-extern int    tm2interval(struct tm * tm, fsec_t fsec, Interval *span);
+extern int interval2tm(Interval span, struct tm * tm, fsec_t *fsec);
+extern int tm2interval(struct tm * tm, fsec_t fsec, Interval *span);

 extern Timestamp SetEpochTimestamp(void);
 extern void GetEpochTime(struct tm * tm);

 extern void isoweek2date(int woy, int *year, int *mon, int *mday);
-extern int    date2isoweek(int year, int mon, int mday);
+extern int date2isoweek(int year, int mon, int mday);

 #endif   /* TIMESTAMP_H */

-------------------------------------------------------------------

or see my attachment .

and I have a problem, what is stetement_timestamp() ??

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