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Allow timezone names in SQL strings, 

'2006-05-24 21:11 Americas/New_York'::timestamptz

Joachim Wieland
This commit is contained in:
Bruce Momjian 2006-06-07 22:32:31 +00:00
parent 51dfe35121
commit 18aee7968a
1 changed files with 66 additions and 5 deletions
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71
src/backend/utils/adt/datetime.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.166 2006/03/05 15:58:41 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.167 2006/06/07 22:32:31 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,6 +22,7 @@
#include "access/xact.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/guc.h"
@ -36,6 +37,7 @@ static int DecodeTime(char *str, int fmask, int *tmask,
struct pg_tm * tm, fsec_t *fsec);
static int DecodeTimezone(char *str, int *tzp);
static int DecodePosixTimezone(char *str, int *tzp);
static int DecodeZicTimezone(char *str, int *tzp, struct pg_tm * tm);
static datetkn *datebsearch(char *key, datetkn *base, unsigned int nel);
static int DecodeDate(char *str, int fmask, int *tmask, struct pg_tm * tm);
static void TrimTrailingZeros(char *str);
@ -888,8 +890,24 @@ ParseDateTime(const char *timestr, char *workbuf, size_t buflen,
{
char delim = *cp;
ftype[nf] = DTK_DATE;
APPEND_CHAR(bufp, bufend, *cp++);
if (*cp == '/')
{
ftype[nf] = DTK_TZ;
/* set the first character of the region to upper case
* again*/
field[nf][0] = pg_toupper((unsigned char) field[nf][0]);
/* we have seen "Region/" of a POSIX timezone, continue to
* read the City part */
do {
APPEND_CHAR(bufp, bufend, *cp++);
/* there is for example America/New_York */
} while (isalpha((unsigned char) *cp) || *cp == '_');
}
else
{
ftype[nf] = DTK_DATE;
APPEND_CHAR(bufp, bufend, *cp++);
}
while (isdigit((unsigned char) *cp) || *cp == delim)
APPEND_CHAR(bufp, bufend, *cp++);
}
@ -980,6 +998,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
bool haveTextMonth = FALSE;
int is2digits = FALSE;
int bc = FALSE;
int zicTzFnum = -1;
/*
* We'll insist on at least all of the date fields, but initialize the
@ -1127,7 +1146,15 @@ DecodeDateTime(char **field, int *ftype, int nf,
if (tzp == NULL)
return DTERR_BAD_FORMAT;
dterr = DecodeTimezone(field[i], &tz);
if (strchr(field[i], '/') != NULL)
{
/* remember to apply the timezone at the end */
zicTzFnum = i;
tmask = DTK_M(TZ);
break;
}
else
dterr = DecodeTimezone(field[i], &tz);
if (dterr)
return dterr;
@ -1605,6 +1632,19 @@ DecodeDateTime(char **field, int *ftype, int nf,
if (tm->tm_mday > day_tab[isleap(tm->tm_year)][tm->tm_mon - 1])
return DTERR_FIELD_OVERFLOW;
if (zicTzFnum != -1)
{
Datum tsTz;
Timestamp timestamp;
tm2timestamp(tm, *fsec, NULL, &timestamp);
tsTz = DirectFunctionCall2(timestamp_zone,
DirectFunctionCall1(textin,
CStringGetDatum(field[zicTzFnum])),
TimestampGetDatum(timestamp));
timestamp2tm(DatumGetTimestampTz(tsTz), tzp, tm, fsec, NULL, NULL);
fmask &= ~DTK_M(TZ);
}
/* timezone not specified? then find local timezone if possible */
if (tzp != NULL && !(fmask & DTK_M(TZ)))
{
@ -1874,7 +1914,15 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
if (tzp == NULL)
return DTERR_BAD_FORMAT;
dterr = DecodeTimezone(field[i], &tz);
if (strchr(field[i], '/') != NULL)
{
/* a date has to be specified */
if ((fmask & DTK_DATE_M) != DTK_DATE_M)
return DTERR_BAD_FORMAT;
dterr = DecodeZicTimezone(field[i], &tz, tm);
}
else
dterr = DecodeTimezone(field[i], &tz);
if (dterr)
return dterr;
@ -2924,6 +2972,19 @@ DecodePosixTimezone(char *str, int *tzp)
return 0;
}
static int
DecodeZicTimezone(char *str, int *tzp, struct pg_tm * tm)
{
struct pg_tz *tz;
tz = pg_tzset(str);
if (!tz)
return DTERR_BAD_FORMAT;
*tzp = DetermineTimeZoneOffset(tm, tz);
return 0;
}
/* DecodeSpecial()
* Decode text string using lookup table.