1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
|
#include "postgres.h"
#include "access/xact.h"
#include "commands/variable.h"
#include "mb/pg_wchar.h"
#include "utils/date.h"
#include "utils/builtins.h"
#include "utils/numeric.h"
#include "utils/formatting.h"
#include <sys/time.h>
#include "orafce.h"
#include "builtins.h"
#define ENABLE_INTERNATIONALIZED_WEEKDAY
#ifdef ENABLE_INTERNATIONALIZED_WEEKDAY
typedef struct WeekDays
{
int encoding;
const char *names[7];
} WeekDays;
/*
* { encoding, { "sun", "mon", "tue", "wed", "thu", "fri", "sat" } },
*/
static const WeekDays WEEKDAYS[] =
{
/* Japanese, UTF8 */
{ PG_UTF8, { "\346\227\245", "\346\234\210", "\347\201\253", "\346\260\264", "\346\234\250", "\351\207\221", "\345\234\237" } },
/* Japanese, EUC_JP */
{ PG_EUC_JP, { "\306\374", "\267\356", "\262\320", "\277\345", "\314\332", "\266\342", "\305\332" } },
/* Japanese, EUC_JIS_2004 (same as EUC_JP) */
{ PG_EUC_JIS_2004, { "\306\374", "\267\356", "\262\320", "\277\345", "\314\332", "\266\342", "\305\332" } },
};
static const WeekDays *mru_weekdays = NULL;
static int
weekday_search(const WeekDays *weekdays, const char *str, size_t len)
{
int i;
for (i = 0; i < 7; i++)
{
size_t n = strlen(weekdays->names[i]);
if (n > len)
continue; /* too short */
if (pg_strncasecmp(weekdays->names[i], str, n) == 0)
return i;
}
return -1; /* not found */
}
#endif /* ENABLE_INTERNATIONALIZED_WEEKDAY */
#define CASE_fmt_YYYY case 0: case 1: case 2: case 3: case 4: case 5: case 6:
#define CASE_fmt_IYYY case 7: case 8: case 9: case 10:
#define CASE_fmt_Q case 11:
#define CASE_fmt_WW case 12:
#define CASE_fmt_IW case 13:
#define CASE_fmt_W case 14:
#define CASE_fmt_DAY case 15: case 16: case 17:
#define CASE_fmt_MON case 18: case 19: case 20: case 21:
#define CASE_fmt_CC case 22: case 23:
#define CASE_fmt_DDD case 24: case 25: case 26:
#define CASE_fmt_HH case 27: case 28: case 29:
#define CASE_fmt_MI case 30:
STRING_PTR_FIELD_TYPE date_fmt[] =
{
"Y", "Yy", "Yyy", "Yyyy", "Year", "Syyyy", "syear",
"I", "Iy", "Iyy", "Iyyy",
"Q", "Ww", "Iw", "W",
"Day", "Dy", "D",
"Month", "Mon", "Mm", "Rm",
"Cc", "Scc",
"Ddd", "Dd", "J",
"Hh", "Hh12", "Hh24",
"Mi",
NULL
};
STRING_PTR_FIELD_TYPE ora_days[] = {"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday", NULL};
#define CHECK_SEQ_SEARCH(_l, _s) \
do { \
if ((_l) < 0) { \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_DATETIME_FORMAT), \
errmsg("invalid value for %s", (_s)))); \
} \
} while (0)
PG_FUNCTION_INFO_V1(next_day);
PG_FUNCTION_INFO_V1(next_day_by_index);
PG_FUNCTION_INFO_V1(last_day);
PG_FUNCTION_INFO_V1(months_between);
PG_FUNCTION_INFO_V1(add_months);
PG_FUNCTION_INFO_V1(ora_to_date);
PG_FUNCTION_INFO_V1(ora_date_trunc);
PG_FUNCTION_INFO_V1(ora_date_round);
PG_FUNCTION_INFO_V1(ora_timestamptz_trunc);
PG_FUNCTION_INFO_V1(ora_timestamptz_round);
PG_FUNCTION_INFO_V1(ora_timestamp_trunc);
PG_FUNCTION_INFO_V1(ora_timestamp_round);
PG_FUNCTION_INFO_V1(orafce_sysdate);
PG_FUNCTION_INFO_V1(orafce_sessiontimezone);
PG_FUNCTION_INFO_V1(orafce_dbtimezone);
/*
* Search const value in char array
*
*/
int
ora_seq_search(const char *name, STRING_PTR_FIELD_TYPE array[], size_t max)
{
int i;
if (!*name)
return -1;
for (i = 0; array[i]; i++)
{
if (strlen(array[i]) == max &&
pg_strncasecmp(name, array[i], max) == 0)
return i;
}
return -1; /* not found */
}
static int
ora_seq_prefix_search(const char *name, STRING_PTR_FIELD_TYPE array[], int max)
{
int i;
if (!*name)
return -1;
for (i = 0; array[i]; i++)
{
if (pg_strncasecmp(name, array[i], max) == 0)
return i;
}
return -1; /* not found */
}
/********************************************************************
*
* next_day
*
* Syntax:
*
* date next_day(date value, text weekday)
*
* Purpose:
*
* Returns the first weekday that is greater than a date value.
*
********************************************************************/
Datum
next_day(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
text *day_txt = PG_GETARG_TEXT_PP(1);
const char *str = VARDATA_ANY(day_txt);
int len = VARSIZE_ANY_EXHDR(day_txt);
int off;
int d = -1;
#ifdef ENABLE_INTERNATIONALIZED_WEEKDAY
/* Check mru_weekdays first for performance. */
if (mru_weekdays)
{
if ((d = weekday_search(mru_weekdays, str, len)) >= 0)
goto found;
else
mru_weekdays = NULL;
}
#endif
/*
* Oracle uses only 3 heading characters of the input.
* Ignore all trailing characters.
*/
if (len >= 3 && (d = ora_seq_prefix_search(str, ora_days, 3)) >= 0)
goto found;
#ifdef ENABLE_INTERNATIONALIZED_WEEKDAY
do
{
int i;
int encoding = GetDatabaseEncoding();
for (i = 0; i < (int) lengthof(WEEKDAYS); i++)
{
if (encoding == WEEKDAYS[i].encoding)
{
if ((d = weekday_search(&WEEKDAYS[i], str, len)) >= 0)
{
mru_weekdays = &WEEKDAYS[i];
goto found;
}
}
}
} while(0);
#endif
CHECK_SEQ_SEARCH(-1, "DAY/Day/day");
found:
off = d - j2day(day+POSTGRES_EPOCH_JDATE);
PG_RETURN_DATEADT((off <= 0) ? day+off+7 : day + off);
}
/* next_day(date, integer) is not documented in Oracle manual, but ... */
Datum
next_day_by_index(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
int idx = PG_GETARG_INT32(1);
int off;
/*
* off is 1..7 (Sun..Sat).
*
* TODO: It should be affected by NLS_TERRITORY. For example,
* 1..7 should be interpreted as Mon..Sun in GERMAN.
*/
CHECK_SEQ_SEARCH((idx < 1 || 7 < idx) ? -1 : 0, "DAY/Day/day");
/* j2day returns 0..6 as Sun..Sat */
off = (idx - 1) - j2day(day+POSTGRES_EPOCH_JDATE);
PG_RETURN_DATEADT((off <= 0) ? day+off+7 : day + off);
}
/********************************************************************
*
* last_day
*
* Syntax:
*
* date last_day(date value)
*
* Purpose:
*
* Returns last day of the month based on a date value
*
********************************************************************/
Datum
last_day(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
DateADT result;
int y, m, d;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
result = date2j(y, m+1, 1) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT(result - 1);
}
static const int month_days[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static int
days_of_month(int y, int m)
{
int days;
if (m < 0 || 12 < m)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("date out of range")));
days = month_days[m - 1];
if (m == 2 && (y % 400 == 0 || (y % 4 == 0 && y % 100 != 0)))
days += 1; /* February 29 in leap year */
return days;
}
/********************************************************************
*
* months_between
*
* Syntax:
*
* numeric months_between(date date1, date date2)
*
* Purpose:
*
* Returns the number of months between date1 and date2. If
* a fractional month is calculated, the months_between function
* calculates the fraction based on a 31-day month.
*
********************************************************************/
Datum
months_between(PG_FUNCTION_ARGS)
{
DateADT date1 = PG_GETARG_DATEADT(0);
DateADT date2 = PG_GETARG_DATEADT(1);
int y1, m1, d1;
int y2, m2, d2;
float8 result;
j2date(date1 + POSTGRES_EPOCH_JDATE, &y1, &m1, &d1);
j2date(date2 + POSTGRES_EPOCH_JDATE, &y2, &m2, &d2);
/* Ignore day components for last days, or based on a 31-day month. */
if (d1 == days_of_month(y1, m1) && d2 == days_of_month(y2, m2))
result = (y1 - y2) * 12 + (m1 - m2);
else
result = (y1 - y2) * 12 + (m1 - m2) + (d1 - d2) / 31.0;
PG_RETURN_NUMERIC(
DirectFunctionCall1(float8_numeric, Float8GetDatumFast(result)));
}
/********************************************************************
*
* add_months
*
* Syntax:
*
* date add_months(date day, int val)
*
* Purpose:
*
* Returns a date plus n months.
*
********************************************************************/
Datum
add_months(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
int n = PG_GETARG_INT32(1);
int y, m, d;
int days;
DateADT result;
div_t v;
bool last_day;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
last_day = (d == days_of_month(y, m));
v = div(y * 12 + m - 1 + n, 12);
y = v.quot;
if (y < 0)
y += 1; /* offset because of year 0 */
m = v.rem + 1;
days = days_of_month(y, m);
if (last_day || d > days)
d = days;
result = date2j(y, m, d) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT (result);
}
/*
* ISO year
*
*/
#define DATE2J(y,m,d) (date2j((y),(m),(d)) - POSTGRES_EPOCH_JDATE)
#define J2DAY(date) (j2day(date + POSTGRES_EPOCH_JDATE))
static DateADT
iso_year (int y, int m, int d)
{
DateADT result, result2, day;
int off;
result = DATE2J(y,1,1);
day = DATE2J(y,m,d);
off = 4 - J2DAY(result);
result += off + ((off >= 0) ? - 3: + 4); /* to monday */
if (result > day)
{
result = DATE2J(y-1,1,1);
off = 4 - J2DAY(result);
result += off + ((off >= 0) ? - 3: + 4); /* to monday */
}
if (((day - result) / 7 + 1) > 52)
{
result2 = DATE2J(y+1,1,1);
off = 4 - J2DAY(result2);
result2 += off + ((off >= 0) ? - 3: + 4); /* to monday */
if (day >= result2)
return result2;
}
return result;
}
static DateADT
_ora_date_trunc(DateADT day, int f)
{
int y, m, d;
DateADT result;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
switch (f)
{
CASE_fmt_CC
if (y > 0)
result = DATE2J((y/100)*100+1,1,1);
else
result = DATE2J(-((99 - (y - 1)) / 100) * 100 + 1,1,1);
break;
CASE_fmt_YYYY
result = DATE2J(y,1,1);
break;
CASE_fmt_IYYY
result = iso_year(y,m,d);
break;
CASE_fmt_MON
result = DATE2J(y,m,1);
break;
CASE_fmt_WW
result = day - (day - DATE2J(y,1,1)) % 7;
break;
CASE_fmt_IW
result = day - (day - iso_year(y,m,d)) % 7;
break;
CASE_fmt_W
result = day - (day - DATE2J(y,m,1)) % 7;
break;
CASE_fmt_DAY
result = day - J2DAY(day);
break;
CASE_fmt_Q
result = DATE2J(y,((m-1)/3)*3+1,1);
break;
default:
result = day;
}
return result;
}
static DateADT
_ora_date_round(DateADT day, int f)
{
int y, m, d, z;
DateADT result;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
switch (f)
{
CASE_fmt_CC
if (y > 0)
result = DATE2J((y/100)*100+(day < DATE2J((y/100)*100+50,1,1) ?1:101),1,1);
else
result = DATE2J((y/100)*100+(day < DATE2J((y/100)*100-50+1,1,1) ?-99:1),1,1);
break;
CASE_fmt_YYYY
result = DATE2J(y+(day<DATE2J(y,7,1)?0:1),1,1);
break;
CASE_fmt_IYYY
{
if (day < DATE2J(y,7,1))
{
result = iso_year(y, m, d);
}
else
{
DateADT iy1 = iso_year(y+1, 1, 8);
result = iy1;
if (((day - DATE2J(y,1,1)) / 7 + 1) >= 52)
{
bool overl = ((date2j(y+2,1,1)-date2j(y+1,1,1)) == 366);
bool isSaturday = (J2DAY(day) == 6);
DateADT iy2 = iso_year(y+2, 1, 8);
DateADT day1 = DATE2J(y+1,1,1);
/* exception saturdays */
if (iy1 >= (day1) && day >= day1 - 2 && isSaturday)
{
result = overl?iy2:iy1;
}
/* iso year stars in last year and day >= iso year */
else if (iy1 <= (day1) && day >= iy1 - 3)
{
DateADT cmp = iy1 - (iy1 < day1?0:1);
int d = J2DAY(day1);
/* some exceptions */
if ((day >= cmp - 2) && (!(d == 3 && overl)))
{
/* if year don't starts in thursday */
if ((d < 4 && J2DAY(day) != 5 && !isSaturday)
||(d == 2 && isSaturday && overl))
{
result = iy2;
}
}
}
}
}
break;
}
CASE_fmt_MON
result = DATE2J(y,m+(day<DATE2J(y,m,16)?0:1),1);
break;
CASE_fmt_WW
z = (day - DATE2J(y,1,1)) % 7;
result = day - z + (z < 4?0:7);
break;
CASE_fmt_IW
{
z = (day - iso_year(y,m,d)) % 7;
result = day - z + (z < 4?0:7);
if (((day - DATE2J(y,1,1)) / 7 + 1) >= 52)
{
/* only for last iso week */
DateADT isoyear = iso_year(y+1, 1, 8);
if (isoyear > (DATE2J(y+1,1,1)-1))
if (day > isoyear - 7)
{
int d = J2DAY(day);
result -= (d == 0 || d > 4?7:0);
}
}
break;
}
CASE_fmt_W
z = (day - DATE2J(y,m,1)) % 7;
result = day - z + (z < 4?0:7);
break;
CASE_fmt_DAY
z = J2DAY(day);
if (y > 0)
result = day - z + (z < 4?0:7);
else
result = day + (5 - (z>0?(z>1?z:z+7):7));
break;
CASE_fmt_Q
result = DATE2J(y,((m-1)/3)*3+(day<(DATE2J(y,((m-1)/3)*3+2,16))?1:4),1);
break;
default:
result = day;
}
return result;
}
/********************************************************************
*
* ora_to_date
*
* Syntax:
*
* timestamp to_date(text date_txt)
*
* Purpose:
*
* Returns date and time format w.r.t NLS_DATE_FORMAT GUC
*
********************************************************************/
Datum
ora_to_date(PG_FUNCTION_ARGS)
{
text *date_txt = PG_GETARG_TEXT_PP(0);
Timestamp result;
if(nls_date_format && strlen(nls_date_format))
{
Datum newDate;
/* it will return timestamp at GMT */
newDate = DirectFunctionCall2(to_timestamp,
PointerGetDatum(date_txt),
CStringGetTextDatum(nls_date_format));
/* convert to local timestamp */
result = DatumGetTimestamp(DirectFunctionCall1(timestamptz_timestamp, newDate));
}
else
result = DatumGetTimestamp(DirectFunctionCall3(timestamp_in,
CStringGetDatum(text_to_cstring(date_txt)),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(-1)));
PG_RETURN_TIMESTAMP(result);
}
/********************************************************************
*
* ora_date_trunc|ora_timestamptz_trunc .. trunc
*
* Syntax:
*
* date trunc(date date1, text format)
*
* Purpose:
*
* Returns d with the time portion of the day truncated to the unit
* specified by the format fmt.
*
********************************************************************/
Datum
ora_date_trunc(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
text *fmt = PG_GETARG_TEXT_PP(1);
DateADT result;
int f = ora_seq_search(VARDATA_ANY(fmt), date_fmt, VARSIZE_ANY_EXHDR(fmt));
CHECK_SEQ_SEARCH(f, "round/trunc format string");
result = _ora_date_trunc(day, f);
PG_RETURN_DATEADT(result);
}
/*
* Workaround for access to session_timezone on WIN32,
*
* session timezone isn't accessed directly, but taken by show_timezone,
* and reparsed. For better performance, the result is cached in fn_extra.
*
*/
static pg_tz *
get_session_timezone(FunctionCallInfo fcinfo)
{
#if defined(WIN32)
pg_tz *result = (pg_tz *) fcinfo->flinfo->fn_extra;
if (result == NULL)
{
const char *tzn = show_timezone();
void *extra;
if (!check_timezone(((char **) &tzn), &extra, PGC_S_CLIENT))
elog(ERROR, "cannot to parse timezone \"%s\"", tzn);
result = *((pg_tz **) extra);
fcinfo->flinfo->fn_extra = result;
/*
* check_timezone allocates small block of pg_tz * size. This block
* should be released by free(extra), but I cannot release memory
* allocated by application in library on MS platform. So I have to
* accept small memory leak - elsewhere exception - broken heap :(
*
*
* cannot be called
free( extra );
*/
}
return result;
#else
return session_timezone;
#endif
}
#define TRUNC_DAY tm->tm_hour = 0; tm->tm_min = 0; *redotz = true;
/*
* redotz is used only for timestamp with time zone
*/
static void
tm_trunc(struct pg_tm *tm, text *fmt, bool *redotz)
{
int f;
f = ora_seq_search(VARDATA_ANY(fmt), date_fmt, VARSIZE_ANY_EXHDR(fmt));
CHECK_SEQ_SEARCH(f, "round/trunc format string");
tm->tm_sec = 0;
switch (f)
{
CASE_fmt_IYYY
CASE_fmt_WW
CASE_fmt_W
CASE_fmt_IW
CASE_fmt_DAY
CASE_fmt_CC
j2date(_ora_date_trunc(DATE2J(tm->tm_year, tm->tm_mon, tm->tm_mday), f)
+ POSTGRES_EPOCH_JDATE,
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
TRUNC_DAY;
break;
CASE_fmt_YYYY
tm->tm_mon = 1;
tm->tm_mday = 1;
TRUNC_DAY;
break;
CASE_fmt_Q
tm->tm_mon = (3*((tm->tm_mon - 1)/3)) + 1;
tm->tm_mday = 1;
TRUNC_DAY;
break;
CASE_fmt_MON
tm->tm_mday = 1;
TRUNC_DAY;
break;
CASE_fmt_DDD
TRUNC_DAY;
break;
CASE_fmt_HH
tm->tm_min = 0;
break;
}
}
Datum
ora_timestamptz_trunc(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
TimestampTz result;
text *fmt = PG_GETARG_TEXT_PP(1);
int tz;
fsec_t fsec;
struct pg_tm tt, *tm = &tt;
const char *tzn;
bool redotz = false;
if (TIMESTAMP_NOT_FINITE(timestamp))
PG_RETURN_TIMESTAMPTZ(timestamp);
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn, NULL) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
tm_trunc(tm, fmt, &redotz);
fsec = 0;
if (redotz)
tz = DetermineTimeZoneOffset(tm, get_session_timezone(fcinfo));
if (tm2timestamp(tm, fsec , &tz, &result) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
PG_RETURN_TIMESTAMPTZ(result);
}
/********************************************************************
*
* ora_date_round|ora_timestamptz_round .. round
*
* Syntax:
*
* date round(date date1, text format)
*
* Purpose:
*
* Returns d with the time portion of the day roundeded to the unit
* specified by the format fmt.
*
********************************************************************/
Datum
ora_date_round(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
text *fmt = PG_GETARG_TEXT_PP(1);
DateADT result;
int f = ora_seq_search(VARDATA_ANY(fmt), date_fmt, VARSIZE_ANY_EXHDR(fmt));
CHECK_SEQ_SEARCH(f, "round/trunc format string");
result = _ora_date_round(day, f);
PG_RETURN_DATEADT(result);
}
#define NOT_ROUND_MDAY(_p_) \
do { if (_p_) rounded = false; } while(0)
#define ROUND_MDAY(_tm_) \
do { if (rounded) _tm_->tm_mday += _tm_->tm_hour >= 12?1:0; } while(0)
static void
tm_round(struct pg_tm *tm, text *fmt, bool *redotz)
{
int f;
bool rounded = true;
f = ora_seq_search(VARDATA_ANY(fmt), date_fmt, VARSIZE_ANY_EXHDR(fmt));
CHECK_SEQ_SEARCH(f, "round/trunc format string");
/* set rounding rule */
switch (f)
{
CASE_fmt_IYYY
NOT_ROUND_MDAY(tm->tm_mday < 8 && tm->tm_mon == 1);
NOT_ROUND_MDAY(tm->tm_mday == 30 && tm->tm_mon == 6);
if (tm->tm_mday >= 28 && tm->tm_mon == 12 && tm->tm_hour >= 12)
{
DateADT isoyear = iso_year(tm->tm_year+1, 1, 8);
DateADT day0 = DATE2J(tm->tm_year+1,1,1);
DateADT dayc = DATE2J(tm->tm_year, tm->tm_mon, tm->tm_mday);
if ((isoyear <= day0) || (day0 <= dayc + 2))
{
rounded = false;
}
}
break;
CASE_fmt_YYYY
NOT_ROUND_MDAY(tm->tm_mday == 30 && tm->tm_mon == 6);
break;
CASE_fmt_MON
NOT_ROUND_MDAY(tm->tm_mday == 15);
break;
CASE_fmt_Q
NOT_ROUND_MDAY(tm->tm_mday == 15 && tm->tm_mon == ((tm->tm_mon-1)/3)*3+2);
break;
CASE_fmt_WW
CASE_fmt_IW
/* last day in year */
NOT_ROUND_MDAY(DATE2J(tm->tm_year, tm->tm_mon, tm->tm_mday) ==
(DATE2J(tm->tm_year+1, 1,1) - 1));
break;
CASE_fmt_W
/* last day in month */
NOT_ROUND_MDAY(DATE2J(tm->tm_year, tm->tm_mon, tm->tm_mday) ==
(DATE2J(tm->tm_year, tm->tm_mon+1,1) - 1));
break;
}
switch (f)
{
/* easier convert to date */
CASE_fmt_IW
CASE_fmt_DAY
CASE_fmt_IYYY
CASE_fmt_WW
CASE_fmt_W
CASE_fmt_CC
CASE_fmt_MON
CASE_fmt_YYYY
CASE_fmt_Q
ROUND_MDAY(tm);
j2date(_ora_date_round(DATE2J(tm->tm_year, tm->tm_mon, tm->tm_mday), f)
+ POSTGRES_EPOCH_JDATE,
&tm->tm_year, &tm->tm_mon, &tm->tm_mday);
tm->tm_hour = 0;
tm->tm_min = 0;
*redotz = true;
break;
CASE_fmt_DDD
tm->tm_mday += (tm->tm_hour >= 12)?1:0;
tm->tm_hour = 0;
tm->tm_min = 0;
*redotz = true;
break;
CASE_fmt_MI
tm->tm_min += (tm->tm_sec >= 30)?1:0;
break;
CASE_fmt_HH
tm->tm_hour += (tm->tm_min >= 30)?1:0;
tm->tm_min = 0;
break;
}
tm->tm_sec = 0;
}
Datum
ora_timestamptz_round(PG_FUNCTION_ARGS)
{
TimestampTz timestamp = PG_GETARG_TIMESTAMPTZ(0);
TimestampTz result;
text *fmt = PG_GETARG_TEXT_PP(1);
int tz;
fsec_t fsec;
struct pg_tm tt, *tm = &tt;
const char *tzn;
bool redotz = false;
if (TIMESTAMP_NOT_FINITE(timestamp))
PG_RETURN_TIMESTAMPTZ(timestamp);
if (timestamp2tm(timestamp, &tz, tm, &fsec, &tzn, NULL) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
tm_round(tm, fmt, &redotz);
fsec = 0;
if (redotz)
tz = DetermineTimeZoneOffset(tm, get_session_timezone(fcinfo));
if (tm2timestamp(tm, fsec, &tz, &result) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
PG_RETURN_TIMESTAMPTZ(result);
}
Datum
ora_timestamp_trunc(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
Timestamp result;
text *fmt = PG_GETARG_TEXT_PP(1);
fsec_t fsec;
struct pg_tm tt, *tm = &tt;
bool redotz = false;
if (TIMESTAMP_NOT_FINITE(timestamp))
PG_RETURN_TIMESTAMP(timestamp);
if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
tm_trunc(tm, fmt, &redotz);
fsec = 0;
if (tm2timestamp(tm, fsec, NULL, &result) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
PG_RETURN_TIMESTAMP(result);
}
Datum
ora_timestamp_round(PG_FUNCTION_ARGS)
{
Timestamp timestamp = PG_GETARG_TIMESTAMP(0);
Timestamp result;
text *fmt = PG_GETARG_TEXT_PP(1);
fsec_t fsec;
struct pg_tm tt, *tm = &tt;
bool redotz = false;
if (TIMESTAMP_NOT_FINITE(timestamp))
PG_RETURN_TIMESTAMPTZ(timestamp);
if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL, NULL) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
tm_round(tm, fmt, &redotz);
if (tm2timestamp(tm, fsec, NULL, &result) != 0)
ereport(ERROR,
(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
errmsg("timestamp out of range")));
PG_RETURN_TIMESTAMP(result);
}
/********************************************************************
*
* ora_sysdate - sysdate
*
* Syntax:
*
* timestamp sysdate()
*
* Purpose:
*
* Returns statement_timestamp in server time zone
* Note - server time zone doesn't exists on PostgreSQL - emulated
* by orafce_timezone
*
********************************************************************/
Datum
orafce_sysdate(PG_FUNCTION_ARGS)
{
Datum sysdate;
Datum sysdate_scaled;
sysdate = DirectFunctionCall2(timestamptz_zone,
CStringGetTextDatum(orafce_timezone),
TimestampTzGetDatum(GetCurrentStatementStartTimestamp()));
/* necessary to cast to timestamp(0) to emulate Oracle's date */
sysdate_scaled = DirectFunctionCall2(timestamp_scale,
sysdate,
Int32GetDatum(0));
PG_RETURN_DATUM(sysdate_scaled);
}
/********************************************************************
*
* ora_systemtimezone
*
* Syntax:
*
* text sessiontimezone()
*
* Purpose:
*
* Returns session time zone
*
********************************************************************/
Datum
orafce_sessiontimezone(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text(show_timezone()));
}
/********************************************************************
*
* ora_dbtimezone
*
* Syntax:
*
* text dbtimezone()
*
* Purpose:
*
* Returns server time zone - emulated by orafce_timezone
*
********************************************************************/
Datum
orafce_dbtimezone(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(cstring_to_text(orafce_timezone));
}
|