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Implement precision support for timestamp and time, both with and without

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time zones.
SQL99 spec requires a default of zero (round to seconds) which is set
 in gram.y as typmod is set in the parse tree. We *could* change to a
 default of either 6 (for internal compatibility with previous versions)
 or 2 (for external compatibility with previous versions).
Evaluate entries in pg_proc wrt the iscachable attribute for timestamp and
 other date/time types. Try to recognize cases where side effects like the
 current time zone setting may have an effect on results to decide whether
 something is cachable or not.
This commit is contained in:
Thomas G. Lockhart
2001-10-03 05:29:27 +00:00
parent a51de40fb6
commit 3e1beda2cd
22 changed files with 946 additions and 942 deletions
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126
src/backend/utils/adt/datetime.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.67 2001/09/28 08:09:10 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.68 2001/10/03 05:29:24 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -26,8 +26,6 @@
#include "utils/datetime.h"
#define ROUND_ALL 1
static int DecodeNumber(int flen, char *field,
int fmask, int *tmask,
struct tm * tm, double *fsec, int *is2digits);
@ -2173,8 +2171,27 @@ EncodeTimeOnly(struct tm * tm, double fsec, int *tzp, int style, char *str)
sec = (tm->tm_sec + fsec);
sprintf(str, "%02d:%02d:", tm->tm_hour, tm->tm_min);
sprintf((str + 6), ((fsec != 0) ? "%05.2f" : "%02.0f"), sec);
sprintf(str, "%02d:%02d", tm->tm_hour, tm->tm_min);
/* If we have fractional seconds, then include a decimal point
* We will do up to 6 fractional digits, and we have rounded any inputs
* to eliminate anything to the right of 6 digits anyway.
* If there are no fractional seconds, then do not bother printing
* a decimal point at all. - thomas 2001-09-29
*/
if (fsec != 0) {
sprintf((str + strlen(str)), ":%013.10f", sec);
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
{
*(str + strlen(str) - 2) = '\0';
}
}
else
{
sprintf((str + strlen(str)), ":%02.0f", sec);
}
if (tzp != NULL)
{
@ -2221,9 +2238,28 @@ EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, cha
case USE_ISO_DATES:
if (tm->tm_year > 0)
{
sprintf(str, "%04d-%02d-%02d %02d:%02d:",
sprintf(str, "%04d-%02d-%02d %02d:%02d",
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min);
sprintf((str + strlen(str)), ((fsec != 0) ? "%05.2f" : "%02.0f"), sec);
/* If we have fractional seconds, then include a decimal point
* We will do up to 6 fractional digits, and we have rounded any inputs
* to eliminate anything to the right of 6 digits anyway.
* If there are no fractional seconds, then do not bother printing
* a decimal point at all. - thomas 2001-09-29
*/
if (fsec != 0) {
sprintf((str + strlen(str)), ":%013.10f", sec);
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
{
*(str + strlen(str) - 2) = '\0';
}
}
else
{
sprintf((str + strlen(str)), ":%02.0f", sec);
}
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
{
@ -2261,8 +2297,28 @@ EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, cha
if (tm->tm_year > 0)
{
sprintf((str + 5), "/%04d %02d:%02d:%05.2f",
tm->tm_year, tm->tm_hour, tm->tm_min, sec);
sprintf((str + 5), "/%04d %02d:%02d",
tm->tm_year, tm->tm_hour, tm->tm_min);
/* If we have fractional seconds, then include a decimal point
* We will do up to 6 fractional digits, and we have rounded any inputs
* to eliminate anything to the right of 6 digits anyway.
* If there are no fractional seconds, then do not bother printing
* a decimal point at all. - thomas 2001-09-29
*/
if (fsec != 0) {
sprintf((str + strlen(str)), ":%013.10f", sec);
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
{
*(str + strlen(str) - 2) = '\0';
}
}
else
{
sprintf((str + strlen(str)), ":%02.0f", sec);
}
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
@ -2277,8 +2333,28 @@ EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, cha
sprintf(str, "%02d.%02d", tm->tm_mday, tm->tm_mon);
if (tm->tm_year > 0)
{
sprintf((str + 5), ".%04d %02d:%02d:%05.2f",
tm->tm_year, tm->tm_hour, tm->tm_min, sec);
sprintf((str + 5), ".%04d %02d:%02d",
tm->tm_year, tm->tm_hour, tm->tm_min);
/* If we have fractional seconds, then include a decimal point
* We will do up to 6 fractional digits, and we have rounded any inputs
* to eliminate anything to the right of 6 digits anyway.
* If there are no fractional seconds, then do not bother printing
* a decimal point at all. - thomas 2001-09-29
*/
if (fsec != 0) {
sprintf((str + strlen(str)), ":%013.10f", sec);
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
{
*(str + strlen(str) - 2) = '\0';
}
}
else
{
sprintf((str + strlen(str)), ":%02.0f", sec);
}
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
@ -2305,18 +2381,30 @@ EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, cha
if (tm->tm_year > 0)
{
sprintf((str + 10), " %02d:%02d", tm->tm_hour, tm->tm_min);
if (fsec != 0)
{
sprintf((str + 16), ":%05.2f %04d", sec, tm->tm_year);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
/* If we have fractional seconds, then include a decimal point
* We will do up to 6 fractional digits, and we have rounded any inputs
* to eliminate anything to the right of 6 digits anyway.
* If there are no fractional seconds, then do not bother printing
* a decimal point at all. - thomas 2001-09-29
*/
if (fsec != 0) {
sprintf((str + strlen(str)), ":%013.10f", sec);
/* chop off trailing pairs of zeros... */
while ((strcmp((str + strlen(str) - 2), "00") == 0)
&& (*(str + strlen(str) - 3) != '.'))
{
*(str + strlen(str) - 2) = '\0';
}
}
else
{
sprintf((str + 16), ":%02.0f %04d", sec, tm->tm_year);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
sprintf((str + strlen(str)), ":%02.0f", sec);
}
sprintf((str + strlen(str)), " %04d", tm->tm_year);
if ((*tzn != NULL) && (tm->tm_isdst >= 0))
sprintf((str + strlen(str)), " %.*s", MAXTZLEN, *tzn);
}
else
{