This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql_priv.h"
#include "unireg.h"
#include "sql_time.h"
#include "sql_class.h"
#include <m_ctype.h>
#ifndef TESTTIME
Name description of interval names used in statements.
'interval_type_to_name' is ordered and sorted on interval size and
interval complexity.
Order of elements in 'interval_type_to_name' should correspond to
the order of elements in 'interval_type' enum
See also interval_type, interval_names
*/
LEX_STRING interval_type_to_name[INTERVAL_LAST] = {
{ C_STRING_WITH_LEN("YEAR")},
{ C_STRING_WITH_LEN("QUARTER")},
{ C_STRING_WITH_LEN("MONTH")},
{ C_STRING_WITH_LEN("WEEK")},
{ C_STRING_WITH_LEN("DAY")},
{ C_STRING_WITH_LEN("HOUR")},
{ C_STRING_WITH_LEN("MINUTE")},
{ C_STRING_WITH_LEN("SECOND")},
{ C_STRING_WITH_LEN("MICROSECOND")},
{ C_STRING_WITH_LEN("YEAR_MONTH")},
{ C_STRING_WITH_LEN("DAY_HOUR")},
{ C_STRING_WITH_LEN("DAY_MINUTE")},
{ C_STRING_WITH_LEN("DAY_SECOND")},
{ C_STRING_WITH_LEN("HOUR_MINUTE")},
{ C_STRING_WITH_LEN("HOUR_SECOND")},
{ C_STRING_WITH_LEN("MINUTE_SECOND")},
{ C_STRING_WITH_LEN("DAY_MICROSECOND")},
{ C_STRING_WITH_LEN("HOUR_MICROSECOND")},
{ C_STRING_WITH_LEN("MINUTE_MICROSECOND")},
{ C_STRING_WITH_LEN("SECOND_MICROSECOND")}
};
int calc_weekday(long daynr,bool sunday_first_day_of_week)
{
DBUG_ENTER("calc_weekday");
DBUG_RETURN ((int) ((daynr + 5L + (sunday_first_day_of_week ? 1L : 0L)) % 7));
}
The bits in week_format has the following meaning:
WEEK_MONDAY_FIRST (0) If not set Sunday is first day of week
If set Monday is first day of week
WEEK_YEAR (1) If not set Week is in range 0-53
Week 0 is returned for the the last week of the previous year (for
a date at start of january) In this case one can get 53 for the
first week of next year. This flag ensures that the week is
relevant for the given year. Note that this flag is only
releveant if WEEK_JANUARY is not set.
If set Week is in range 1-53.
In this case one may get week 53 for a date in January (when
the week is that last week of previous year) and week 1 for a
date in December.
WEEK_FIRST_WEEKDAY (2) If not set Weeks are numbered according
to ISO 8601:1988
If set The week that contains the first
'first-day-of-week' is week 1.
ISO 8601:1988 means that if the week containing January 1 has
four or more days in the new year, then it is week 1;
Otherwise it is the last week of the previous year, and the
next week is week 1.
*/
uint calc_week(MYSQL_TIME *l_time, uint week_behaviour, uint *year)
{
uint days;
ulong daynr=calc_daynr(l_time->year,l_time->month,l_time->day);
ulong first_daynr=calc_daynr(l_time->year,1,1);
bool monday_first= MY_TEST(week_behaviour & WEEK_MONDAY_FIRST);
bool week_year= MY_TEST(week_behaviour & WEEK_YEAR);
bool first_weekday= MY_TEST(week_behaviour & WEEK_FIRST_WEEKDAY);
uint weekday=calc_weekday(first_daynr, !monday_first);
*year=l_time->year;
if (l_time->month == 1 && l_time->day <= 7-weekday)
{
if (!week_year &&
((first_weekday && weekday != 0) ||
(!first_weekday && weekday >= 4)))
return 0;
week_year= 1;
(*year)--;
first_daynr-= (days=calc_days_in_year(*year));
weekday= (weekday + 53*7- days) % 7;
}
if ((first_weekday && weekday != 0) ||
(!first_weekday && weekday >= 4))
days= daynr - (first_daynr+ (7-weekday));
else
days= daynr - (first_daynr - weekday);
if (week_year && days >= 52*7)
{
weekday= (weekday + calc_days_in_year(*year)) % 7;
if ((!first_weekday && weekday < 4) ||
(first_weekday && weekday == 0))
{
(*year)++;
return 1;
}
}
return days/7+1;
}
void get_date_from_daynr(long daynr,uint *ret_year,uint *ret_month,
uint *ret_day)
{
uint year,temp,leap_day,day_of_year,days_in_year;
uchar *month_pos;
DBUG_ENTER("get_date_from_daynr");
if (daynr <= 365L || daynr >= 3652500)
{
*ret_year= *ret_month = *ret_day =0;
}
else
{
year= (uint) (daynr*100 / 36525L);
temp=(((year-1)/100+1)*3)/4;
day_of_year=(uint) (daynr - (long) year * 365L) - (year-1)/4 +temp;
while (day_of_year > (days_in_year= calc_days_in_year(year)))
{
day_of_year-=days_in_year;
(year)++;
}
leap_day=0;
if (days_in_year == 366)
{
if (day_of_year > 31+28)
{
day_of_year--;
if (day_of_year == 31+28)
leap_day=1;
}
}
*ret_month=1;
for (month_pos= days_in_month ;
day_of_year > (uint) *month_pos ;
day_of_year-= *(month_pos++), (*ret_month)++)
;
*ret_year=year;
*ret_day=day_of_year+leap_day;
}
DBUG_VOID_RETURN;
}
ulong convert_period_to_month(ulong period)
{
ulong a,b;
if (period == 0)
return 0L;
if ((a=period/100) < YY_PART_YEAR)
a+=2000;
else if (a < 100)
a+=1900;
b=period%100;
return a*12+b-1;
}
ulong convert_month_to_period(ulong month)
{
ulong year;
if (month == 0L)
return 0L;
if ((year=month/12) < 100)
{
year+=(year < YY_PART_YEAR) ? 2000 : 1900;
}
return year*100+month%12+1;
}
Convert a string to 8-bit representation,
for use in str_to_time/str_to_date/str_to_date.
In the future to_ascii() can be extended to convert
non-ASCII digits to ASCII digits
(for example, ARABIC-INDIC, DEVANAGARI, BENGALI, and so on)
so DATE/TIME/DATETIME values understand digits in the
respected scripts.
*/
static uint
to_ascii(const CHARSET_INFO *cs,
const char *src, uint src_length,
char *dst, uint dst_length)
{
int cnvres;
my_wc_t wc;
const char *srcend= src + src_length;
char *dst0= dst, *dstend= dst + dst_length - 1;
while (dst < dstend &&
(cnvres= (cs->cset->mb_wc)(cs, &wc,
(const uchar*) src,
(const uchar*) srcend)) > 0 &&
wc < 128)
{
src+= cnvres;
*dst++= wc;
}
*dst= '\0';
return dst - dst0;
}
bool str_to_time(const CHARSET_INFO *cs, const char *str,uint length,
MYSQL_TIME *l_time, uint flags, MYSQL_TIME_STATUS *status)
{
char cnv[MAX_TIME_FULL_WIDTH + 3];
if ((cs->state & MY_CS_NONASCII) != 0)
{
length= to_ascii(cs, str, length, cnv, sizeof(cnv));
str= cnv;
}
return str_to_time(str, length, l_time, status) ||
(!(flags & TIME_NO_NSEC_ROUNDING) &&
time_add_nanoseconds_with_round(l_time, status->nanoseconds,
&status->warnings));
}
bool str_to_datetime(const CHARSET_INFO *cs,
const char *str, uint length,
MYSQL_TIME *l_time, uint flags,
MYSQL_TIME_STATUS *status)
{
char cnv[MAX_DATETIME_FULL_WIDTH + 3];
if ((cs->state & MY_CS_NONASCII) != 0)
{
length= to_ascii(cs, str, length, cnv, sizeof(cnv));
str= cnv;
}
return str_to_datetime(str, length, l_time, flags, status) ||
(!(flags & TIME_NO_NSEC_ROUNDING) &&
datetime_add_nanoseconds_with_round(l_time,
status->nanoseconds,
&status->warnings));
}
Add nanoseconds to a time value with rounding.
@param IN/OUT ltime MYSQL_TIME variable to add to.
@param nanosecons Nanosecons value.
@param IN/OUT warnings Warning flag vector.
@retval False on success, true on error.
*/
bool time_add_nanoseconds_with_round(MYSQL_TIME *ltime,
uint nanoseconds, int *warnings)
{
DBUG_ASSERT(nanoseconds < 1000000000);
DBUG_ASSERT(!check_time_mmssff_range(ltime));
if (nanoseconds < 500)
return false;
ltime->second_part+= (nanoseconds + 500) / 1000;
if (ltime->second_part < 1000000)
goto ret;
ltime->second_part%= 1000000;
if (ltime->second < 59)
{
ltime->second++;
goto ret;
}
ltime->second= 0;
if (ltime->minute < 59)
{
ltime->minute++;
goto ret;
}
ltime->minute= 0;
ltime->hour++;
ret:
We can get '838:59:59.000001' at this point, which
is bigger than the maximum possible value '838:59:59.000000'.
Checking only "hour > 838" is not enough.
Do full adjust_time_range().
*/
adjust_time_range(ltime, warnings);
return false;
}
Add nanoseconds to a datetime value with rounding.
@param IN/OUT ltime MYSQL_TIME variable to add to.
@param nanosecons Nanosecons value.
@param IN/OUT warnings Warning flag vector.
@retval False on success, true on error.
*/
bool datetime_add_nanoseconds_with_round(MYSQL_TIME *ltime,
uint nanoseconds, int *warnings)
{
DBUG_ASSERT(nanoseconds < 1000000000);
if (nanoseconds < 500)
return false;
ltime->second_part+= (nanoseconds + 500) / 1000;
if (ltime->second_part < 1000000)
return false;
ltime->second_part%= 1000000;
INTERVAL interval;
memset(&interval, 0, sizeof(interval));
interval.second= 1;
if (check_date(ltime, non_zero_date(ltime),
(TIME_NO_ZERO_IN_DATE | TIME_NO_ZERO_DATE), warnings))
return true;
if (date_add_interval(ltime, INTERVAL_SECOND, interval))
{
*warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE;
return true;
}
return false;
}
Convert a timestamp string to a MYSQL_TIME value and produce a warning
if string was truncated during conversion.
NOTE
See description of str_to_datetime() for more information.
*/
bool
str_to_datetime_with_warn(String *str, MYSQL_TIME *l_time, uint flags)
{
MYSQL_TIME_STATUS status;
THD *thd= current_thd;
bool ret_val= str_to_datetime(str, l_time,
(flags | (thd->variables.sql_mode &
(MODE_INVALID_DATES | MODE_NO_ZERO_DATE))),
&status);
if (ret_val || status.warnings)
make_truncated_value_warning(ErrConvString(str), l_time->time_type);
return ret_val;
}
Convert lldiv_t to datetime.
@param lld The value to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@param IN/OUT warnings Warning flags.
@return False on success, true on error.
*/
static bool
lldiv_t_to_datetime(lldiv_t lld, MYSQL_TIME *ltime, uint flags, int *warnings)
{
if (lld.rem < 0 ||
number_to_datetime(lld.quot, ltime, flags, warnings) == LL(-1))
{
set_zero_time(ltime, MYSQL_TIMESTAMP_ERROR);
if (!*warnings)
*warnings|= MYSQL_TIME_WARN_TRUNCATED;
return true;
}
else if (ltime->time_type == MYSQL_TIMESTAMP_DATE)
{
Generate a warning in case of DATE with fractional part:
20011231.1234 -> '2001-12-31'
unless the caller does not want the warning: for example, CAST does.
*/
if (lld.rem && !(flags & TIME_NO_DATE_FRAC_WARN))
*warnings|= MYSQL_TIME_WARN_TRUNCATED;
}
else if (!(flags & TIME_NO_NSEC_ROUNDING))
{
ltime->second_part= lld.rem / 1000;
return datetime_add_nanoseconds_with_round(ltime, lld.rem % 1000, warnings);
}
return false;
}
Convert decimal value to datetime value with a warning.
@param decimal The value to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@return False on success, true on error.
*/
bool
my_decimal_to_datetime_with_warn(const my_decimal *decimal,
MYSQL_TIME *ltime, uint flags)
{
lldiv_t lld;
int warnings= 0;
bool rc;
if ((rc= my_decimal2lldiv_t(0, decimal, &lld)))
{
warnings|= MYSQL_TIME_WARN_TRUNCATED;
set_zero_time(ltime, MYSQL_TIMESTAMP_NONE);
}
else
rc= lldiv_t_to_datetime(lld, ltime, flags, &warnings);
if (warnings)
make_truncated_value_warning(ErrConvString(decimal), ltime->time_type);
return rc;
}
Convert double value to datetime value with a warning.
@param nr The value to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@return False on success, true on error.
*/
bool
my_double_to_datetime_with_warn(double nr, MYSQL_TIME *ltime, uint flags)
{
lldiv_t lld;
int warnings= 0;
bool rc;
if ((rc= (double2lldiv_t(nr, &lld) != E_DEC_OK)))
{
warnings|= MYSQL_TIME_WARN_TRUNCATED;
set_zero_time(ltime, MYSQL_TIMESTAMP_NONE);
}
else
rc= lldiv_t_to_datetime(lld, ltime, flags, &warnings);
if (warnings)
make_truncated_value_warning(ErrConvString(nr), ltime->time_type);
return rc;
}
Convert longlong value to datetime value with a warning.
@param nr The value to convert from.
@param OUT ltime The variable to convert to.
@return False on success, true on error.
*/
bool
my_longlong_to_datetime_with_warn(longlong nr, MYSQL_TIME *ltime, uint flags)
{
int warnings= 0;
bool rc= number_to_datetime(nr, ltime, flags, &warnings) == LL(-1);
if (warnings)
make_truncated_value_warning(ErrConvString(nr), MYSQL_TIMESTAMP_NONE);
return rc;
}
Convert lldiv_t value to time with nanosecond rounding.
@param lld The value to convert from.
@param OUT ltime The variable to convert to,
@param flags Conversion flags.
@param IN/OUT warnings Warning flags.
@return False on success, true on error.
*/
static bool lldiv_t_to_time(lldiv_t lld, MYSQL_TIME *ltime, int *warnings)
{
if (number_to_time(lld.quot, ltime, warnings))
return true;
Both lld.quot and lld.rem can give negative result value,
thus combine them using "|=".
*/
if ((ltime->neg|= (lld.rem < 0)))
lld.rem= -lld.rem;
ltime->second_part= lld.rem / 1000;
return time_add_nanoseconds_with_round(ltime, lld.rem % 1000, warnings);
}
Convert decimal number to TIME
@param decimal_value The number to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@return False on success, true on error.
*/
bool my_decimal_to_time_with_warn(const my_decimal *decimal, MYSQL_TIME *ltime)
{
lldiv_t lld;
int warnings= 0;
bool rc;
if ((rc= my_decimal2lldiv_t(0, decimal, &lld)))
{
warnings|= MYSQL_TIME_WARN_TRUNCATED;
set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
}
else
rc= lldiv_t_to_time(lld, ltime, &warnings);
if (warnings)
make_truncated_value_warning(ErrConvString(decimal), MYSQL_TIMESTAMP_TIME);
return rc;
}
Convert double number to TIME
@param nr The number to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@return False on success, true on error.
*/
bool my_double_to_time_with_warn(double nr, MYSQL_TIME *ltime)
{
lldiv_t lld;
int warnings= 0;
bool rc;
if ((rc= (double2lldiv_t(nr, &lld) != E_DEC_OK)))
{
warnings|= MYSQL_TIME_WARN_TRUNCATED;
set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
}
else
rc= lldiv_t_to_time(lld, ltime, &warnings);
if (warnings)
make_truncated_value_warning(ErrConvString(nr), MYSQL_TIMESTAMP_TIME);
return rc;
}
Convert longlong number to TIME
@param nr The number to convert from.
@param OUT ltime The variable to convert to.
@param flags Conversion flags.
@return False on success, true on error.
*/
bool my_longlong_to_time_with_warn(longlong nr, MYSQL_TIME *ltime)
{
int warnings= 0;
bool rc= number_to_time(nr, ltime, &warnings);
if (warnings)
make_truncated_value_warning(ErrConvString(nr), MYSQL_TIMESTAMP_TIME);
return rc;
}
Convert a time string to a MYSQL_TIME struct and produce a warning
if string was cut during conversion.
NOTE
See str_to_time() for more info.
*/
bool
str_to_time_with_warn(String *str, MYSQL_TIME *l_time)
{
MYSQL_TIME_STATUS status;
bool ret_val= str_to_time(str, l_time, 0, &status);
if (ret_val || status.warnings)
make_truncated_value_warning(ErrConvString(str), MYSQL_TIMESTAMP_TIME);
return ret_val;
}
Convert a system time structure to TIME
*/
void localtime_to_TIME(MYSQL_TIME *to, struct tm *from)
{
to->neg=0;
to->second_part=0;
to->year= (int) ((from->tm_year+1900) % 10000);
to->month= (int) from->tm_mon+1;
to->day= (int) from->tm_mday;
to->hour= (int) from->tm_hour;
to->minute= (int) from->tm_min;
to->second= (int) from->tm_sec;
}
void calc_time_from_sec(MYSQL_TIME *to, longlong seconds, long microseconds)
{
long t_seconds;
to->time_type= MYSQL_TIMESTAMP_TIME;
to->year= 0;
to->month= 0;
to->day= 0;
DBUG_ASSERT(seconds < (0xFFFFFFFFLL * 3600LL));
to->hour= (long) (seconds / 3600L);
t_seconds= (long) (seconds % 3600L);
to->minute= t_seconds/60L;
to->second= t_seconds%60L;
to->second_part= microseconds;
}
Parse a format string specification
SYNOPSIS
parse_date_time_format()
format_type Format of string (time, date or datetime)
format_str String to parse
format_length Length of string
date_time_format Format to fill in
NOTES
Fills in date_time_format->positions for all date time parts.
positions marks the position for a datetime element in the format string.
The position array elements are in the following order:
YYYY-DD-MM HH-MM-DD.FFFFFF AM
0 1 2 3 4 5 6 7
If positions[0]= 5, it means that year will be the forth element to
read from the parsed date string.
RETURN
0 ok
1 error
*/
bool parse_date_time_format(timestamp_type format_type,
const char *format, uint format_length,
DATE_TIME_FORMAT *date_time_format)
{
uint offset= 0, separators= 0;
const char *ptr= format, *format_str;
const char *end= ptr+format_length;
uchar *dt_pos= date_time_format->positions;
bool need_p= 0, allow_separator= 0;
ulong part_map= 0, separator_map= 0;
const char *parts[16];
date_time_format->time_separator= 0;
date_time_format->flag= 0;
Fill position with 'dummy' arguments to found out if a format tag is
used twice (This limit's the format to 255 characters, but this is ok)
*/
dt_pos[0]= dt_pos[1]= dt_pos[2]= dt_pos[3]=
dt_pos[4]= dt_pos[5]= dt_pos[6]= dt_pos[7]= 255;
for (; ptr != end; ptr++)
{
if (*ptr == '%' && ptr+1 != end)
{
uint position;
LINT_INIT(position);
switch (*++ptr) {
case 'y':
case 'Y':
position= 0;
break;
case 'c':
case 'm':
position= 1;
break;
case 'd':
case 'e':
position= 2;
break;
case 'h':
case 'I':
case 'l':
need_p= 1;
case 'k':
case 'H':
position= 3;
break;
case 'i':
position= 4;
break;
case 's':
case 'S':
position= 5;
break;
case 'f':
position= 6;
if (dt_pos[5] != offset-1 || ptr[-2] != '.')
return 1;
break;
case 'p':
if (offset == 0)
return 0;
position= 7;
break;
default:
return 1;
}
if (dt_pos[position] != 255)
return 1;
parts[position]= ptr-1;
If switching from time to date, ensure that all time parts
are used
*/
if (part_map && position <= 2 && !(part_map & (1 | 2 | 4)))
offset=5;
part_map|= (ulong) 1 << position;
dt_pos[position]= offset++;
allow_separator= 1;
}
else
{
Don't allow any characters in format as this could easily confuse
the date reader
*/
if (!allow_separator)
return 1;
allow_separator= 0;
separators++;
if (my_ispunct(&my_charset_latin1, *ptr))
separator_map|= (ulong) 1 << (offset-1);
else if (!my_isspace(&my_charset_latin1, *ptr))
return 1;
}
}
if ((part_map & 32) && !(part_map & 64))
{
dt_pos[6]= dt_pos[5] +1;
parts[6]= parts[5];
if (dt_pos[6] == dt_pos[7])
dt_pos[7]++;
}
Check that we have not used a non legal format specifier and that all
format specifiers have been used
The last test is to ensure that %p is used if and only if
it's needed.
*/
if ((format_type == MYSQL_TIMESTAMP_DATETIME &&
!test_all_bits(part_map, (1 | 2 | 4 | 8 | 16 | 32))) ||
(format_type == MYSQL_TIMESTAMP_DATE && part_map != (1 | 2 | 4)) ||
(format_type == MYSQL_TIMESTAMP_TIME &&
!test_all_bits(part_map, 8 | 16 | 32)) ||
!allow_separator ||
(need_p && dt_pos[6] +1 != dt_pos[7]) ||
(need_p ^ (dt_pos[7] != 255)))
return 1;
if (dt_pos[6] != 255)
{
uint pos= dt_pos[6] -1;
separator_map= ((separator_map & ((ulong) (1 << pos)-1)) |
((separator_map & ~((ulong) (1 << pos)-1)) >> 1));
if (part_map & 64)
{
separators--;
need_p= 1;
}
}
Remove possible separator before %p from sep_map
(This can either be at position 3, 4, 6 or 7) h.m.d.%f %p
*/
if (dt_pos[7] != 255)
{
if (need_p && parts[7] != parts[6]+2)
separators--;
}
Calculate if %p is in first or last part of the datetime field
At this point we have either %H-%i-%s %p 'year parts' or
'year parts' &H-%i-%s %p" as %f was removed above
*/
offset= dt_pos[6] <= 3 ? 3 : 6;
separator_map= ((separator_map & ((ulong) (1 << offset)-1)) |
((separator_map & ~((ulong) (1 << offset)-1)) >> 1));
format_str= 0;
switch (format_type) {
case MYSQL_TIMESTAMP_DATE:
format_str= known_date_time_formats[INTERNAL_FORMAT].date_format;
case MYSQL_TIMESTAMP_TIME:
if (!format_str)
format_str=known_date_time_formats[INTERNAL_FORMAT].time_format;
If there is no separators, allow the internal format as we can read
this. If separators are used, they must be between each part
*/
if (format_length == 6 && !need_p &&
!my_strnncoll(&my_charset_bin,
(const uchar *) format, 6,
(const uchar *) format_str, 6))
return 0;
if (separator_map == (1 | 2))
{
if (format_type == MYSQL_TIMESTAMP_TIME)
{
if (*(format+2) != *(format+5))
break;
date_time_format->time_separator= *(format+2);
}
return 0;
}
break;
case MYSQL_TIMESTAMP_DATETIME:
If there is no separators, allow the internal format as we can read
this. If separators are used, they must be between each part.
Between DATE and TIME we also allow space as separator
*/
if ((format_length == 12 && !need_p &&
!my_strnncoll(&my_charset_bin,
(const uchar *) format, 12,
(const uchar*) known_date_time_formats[INTERNAL_FORMAT].datetime_format,
12)) ||
(separators == 5 && separator_map == (1 | 2 | 8 | 16)))
return 0;
break;
default:
DBUG_ASSERT(1);
break;
}
return 1;
}
Create a DATE_TIME_FORMAT object from a format string specification
SYNOPSIS
date_time_format_make()
format_type Format to parse (time, date or datetime)
format_str String to parse
format_length Length of string
NOTES
The returned object should be freed with my_free()
RETURN
NULL ponter: Error
new object
*/
DATE_TIME_FORMAT
*date_time_format_make(timestamp_type format_type,
const char *format_str, uint format_length)
{
DATE_TIME_FORMAT tmp;
if (format_length && format_length < 255 &&
!parse_date_time_format(format_type, format_str,
format_length, &tmp))
{
tmp.format.str= (char*) format_str;
tmp.format.length= format_length;
return date_time_format_copy((THD *)0, &tmp);
}
return 0;
}
Create a copy of a DATE_TIME_FORMAT object
SYNOPSIS
date_and_time_format_copy()
thd Set if variable should be allocated in thread mem
format format to copy
NOTES
The returned object should be freed with my_free()
RETURN
NULL ponter: Error
new object
*/
DATE_TIME_FORMAT *date_time_format_copy(THD *thd, DATE_TIME_FORMAT *format)
{
DATE_TIME_FORMAT *new_format;
ulong length= sizeof(*format) + format->format.length + 1;
if (thd)
new_format= (DATE_TIME_FORMAT *) thd->alloc(length);
else
new_format= (DATE_TIME_FORMAT *) my_malloc(length, MYF(MY_WME));
if (new_format)
{
new_format->format.str= (char*) (new_format+1);
memcpy((char*) new_format->positions, (char*) format->positions,
sizeof(format->positions));
new_format->time_separator= format->time_separator;
memcpy((char*) new_format->format.str, format->format.str,
format->format.length);
new_format->format.str[format->format.length]= 0;
new_format->format.length= format->format.length;
}
return new_format;
}
KNOWN_DATE_TIME_FORMAT known_date_time_formats[6]=
{
{"USA", "%m.%d.%Y", "%Y-%m-%d %H.%i.%s", "%h:%i:%s %p" },
{"JIS", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
{"ISO", "%Y-%m-%d", "%Y-%m-%d %H:%i:%s", "%H:%i:%s" },
{"EUR", "%d.%m.%Y", "%Y-%m-%d %H.%i.%s", "%H.%i.%s" },
{"INTERNAL", "%Y%m%d", "%Y%m%d%H%i%s", "%H%i%s" },
{ 0, 0, 0, 0 }
};
Return format string according format name.
If name is unknown, result is NULL
*/
const char *get_date_time_format_str(KNOWN_DATE_TIME_FORMAT *format,
timestamp_type type)
{
switch (type) {
case MYSQL_TIMESTAMP_DATE:
return format->date_format;
case MYSQL_TIMESTAMP_DATETIME:
return format->datetime_format;
case MYSQL_TIMESTAMP_TIME:
return format->time_format;
default:
DBUG_ASSERT(0);
return 0;
}
}
Functions to create default time/date/datetime strings
NOTE:
For the moment the DATE_TIME_FORMAT argument is ignored becasue
MySQL doesn't support comparing of date/time/datetime strings that
are not in arbutary order as dates are compared as strings in some
context)
This functions don't check that given MYSQL_TIME structure members are
in valid range. If they are not, return value won't reflect any
valid date either. Additionally, make_time doesn't take into
account time->day member: it's assumed that days have been converted
to hours already.
****************************************************************************/
Convert TIME value to String.
@param format Format (unused, see comments above)
@param l_time TIME value
@param OUT str String to conver to
@param dec Number of fractional digits.
*/
void make_time(const DATE_TIME_FORMAT *format __attribute__((unused)),
const MYSQL_TIME *l_time, String *str, uint dec)
{
uint length= (uint) my_time_to_str(l_time, (char*) str->ptr(), dec);
str->length(length);
str->set_charset(&my_charset_numeric);
}
Convert DATE value to String.
@param format Format (unused, see comments above)
@param l_time DATE value
@param OUT str String to conver to
*/
void make_date(const DATE_TIME_FORMAT *format __attribute__((unused)),
const MYSQL_TIME *l_time, String *str)
{
uint length= (uint) my_date_to_str(l_time, (char*) str->ptr());
str->length(length);
str->set_charset(&my_charset_numeric);
}
Convert DATETIME value to String.
@param format Format (unused, see comments above)
@param l_time DATE value
@param OUT str String to conver to
@param dec Number of fractional digits.
*/
void make_datetime(const DATE_TIME_FORMAT *format __attribute__((unused)),
const MYSQL_TIME *l_time, String *str, uint dec)
{
uint length= (uint) my_datetime_to_str(l_time, (char*) str->ptr(), dec);
str->length(length);
str->set_charset(&my_charset_numeric);
}
Convert TIME/DATE/DATETIME value to String.
@param l_time DATE value
@param OUT str String to conver to
@param dec Number of fractional digits.
*/
bool my_TIME_to_str(const MYSQL_TIME *ltime, String *str, uint dec)
{
if (str->alloc(MAX_DATE_STRING_REP_LENGTH))
return true;
str->set_charset(&my_charset_numeric);
str->length(my_TIME_to_str(ltime, const_cast<char*>(str->ptr()), dec));
return false;
}
void make_truncated_value_warning(THD *thd,
Sql_condition::enum_warning_level level,
ErrConvString val, timestamp_type time_type,
const char *field_name)
{
char warn_buff[MYSQL_ERRMSG_SIZE];
const char *type_str;
CHARSET_INFO *cs= system_charset_info;
switch (time_type) {
case MYSQL_TIMESTAMP_DATE:
type_str= "date";
break;
case MYSQL_TIMESTAMP_TIME:
type_str= "time";
break;
case MYSQL_TIMESTAMP_DATETIME:
default:
type_str= "datetime";
break;
}
if (field_name)
cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),
ER(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD),
type_str, val.ptr(), field_name,
(ulong) thd->get_stmt_da()->current_row_for_warning());
else
{
if (time_type > MYSQL_TIMESTAMP_ERROR)
cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),
ER(ER_TRUNCATED_WRONG_VALUE),
type_str, val.ptr());
else
cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),
ER(ER_WRONG_VALUE), type_str, val.ptr());
}
push_warning(thd, level, ER_TRUNCATED_WRONG_VALUE, warn_buff);
}
#define MAX_DAY_NUMBER 3652424L
bool date_add_interval(MYSQL_TIME *ltime, interval_type int_type, INTERVAL interval)
{
long period, sign;
ltime->neg= 0;
sign= (interval.neg ? -1 : 1);
switch (int_type) {
case INTERVAL_SECOND:
case INTERVAL_SECOND_MICROSECOND:
case INTERVAL_MICROSECOND:
case INTERVAL_MINUTE:
case INTERVAL_HOUR:
case INTERVAL_MINUTE_MICROSECOND:
case INTERVAL_MINUTE_SECOND:
case INTERVAL_HOUR_MICROSECOND:
case INTERVAL_HOUR_SECOND:
case INTERVAL_HOUR_MINUTE:
case INTERVAL_DAY_MICROSECOND:
case INTERVAL_DAY_SECOND:
case INTERVAL_DAY_MINUTE:
case INTERVAL_DAY_HOUR:
{
longlong sec, days, daynr, microseconds, extra_sec;
ltime->time_type= MYSQL_TIMESTAMP_DATETIME;
microseconds= ltime->second_part + sign*interval.second_part;
extra_sec= microseconds/1000000L;
microseconds= microseconds%1000000L;
sec=((ltime->day-1)*3600*24L+ltime->hour*3600+ltime->minute*60+
ltime->second +
sign* (longlong) (interval.day*3600*24L +
interval.hour*LL(3600)+interval.minute*LL(60)+
interval.second))+ extra_sec;
if (microseconds < 0)
{
microseconds+= LL(1000000);
sec--;
}
days= sec/(3600*LL(24));
sec-= days*3600*LL(24);
if (sec < 0)
{
days--;
sec+= 3600*LL(24);
}
ltime->second_part= (uint) microseconds;
ltime->second= (uint) (sec % 60);
ltime->minute= (uint) (sec/60 % 60);
ltime->hour= (uint) (sec/3600);
daynr= calc_daynr(ltime->year,ltime->month,1) + days;
if ((ulonglong) daynr > MAX_DAY_NUMBER)
goto invalid_date;
get_date_from_daynr((long) daynr, <ime->year, <ime->month,
<ime->day);
break;
}
case INTERVAL_DAY:
case INTERVAL_WEEK:
period= (calc_daynr(ltime->year,ltime->month,ltime->day) +
sign * (long) interval.day);
if ((ulong) period > MAX_DAY_NUMBER)
goto invalid_date;
get_date_from_daynr((long) period,<ime->year,<ime->month,<ime->day);
break;
case INTERVAL_YEAR:
ltime->year+= sign * (long) interval.year;
if ((ulong) ltime->year >= 10000L)
goto invalid_date;
if (ltime->month == 2 && ltime->day == 29 &&
calc_days_in_year(ltime->year) != 366)
ltime->day=28;
break;
case INTERVAL_YEAR_MONTH:
case INTERVAL_QUARTER:
case INTERVAL_MONTH:
period= (ltime->year*12 + sign * (long) interval.year*12 +
ltime->month-1 + sign * (long) interval.month);
if ((ulong) period >= 120000L)
goto invalid_date;
ltime->year= (uint) (period / 12);
ltime->month= (uint) (period % 12L)+1;
if (ltime->day > days_in_month[ltime->month-1])
{
ltime->day = days_in_month[ltime->month-1];
if (ltime->month == 2 && calc_days_in_year(ltime->year) == 366)
ltime->day++;
}
break;
default:
goto null_date;
}
return 0;
invalid_date:
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_WARN,
ER_DATETIME_FUNCTION_OVERFLOW,
ER(ER_DATETIME_FUNCTION_OVERFLOW),
"datetime");
null_date:
return 1;
}
Calculate difference between two datetime values as seconds + microseconds.
SYNOPSIS
calc_time_diff()
l_time1 - TIME/DATE/DATETIME value
l_time2 - TIME/DATE/DATETIME value
l_sign - 1 absolute values are substracted,
-1 absolute values are added.
seconds_out - Out parameter where difference between
l_time1 and l_time2 in seconds is stored.
microseconds_out- Out parameter where microsecond part of difference
between l_time1 and l_time2 is stored.
NOTE
This function calculates difference between l_time1 and l_time2 absolute
values. So one should set l_sign and correct result if he want to take
signs into account (i.e. for MYSQL_TIME values).
RETURN VALUES
Returns sign of difference.
1 means negative result
0 means positive result
*/
bool
calc_time_diff(const MYSQL_TIME *l_time1, const MYSQL_TIME *l_time2,
int l_sign, longlong *seconds_out, long *microseconds_out)
{
long days;
bool neg;
longlong microseconds;
We suppose that if first argument is MYSQL_TIMESTAMP_TIME
the second argument should be TIMESTAMP_TIME also.
We should check it before calc_time_diff call.
*/
if (l_time1->time_type == MYSQL_TIMESTAMP_TIME)
days= (long)l_time1->day - l_sign * (long)l_time2->day;
else
{
days= calc_daynr((uint) l_time1->year,
(uint) l_time1->month,
(uint) l_time1->day);
if (l_time2->time_type == MYSQL_TIMESTAMP_TIME)
days-= l_sign * (long)l_time2->day;
else
days-= l_sign*calc_daynr((uint) l_time2->year,
(uint) l_time2->month,
(uint) l_time2->day);
}
microseconds= ((longlong)days * SECONDS_IN_24H +
(longlong)(l_time1->hour*3600L +
l_time1->minute*60L +
l_time1->second) -
l_sign*(longlong)(l_time2->hour*3600L +
l_time2->minute*60L +
l_time2->second)) * LL(1000000) +
(longlong)l_time1->second_part -
l_sign*(longlong)l_time2->second_part;
neg= 0;
if (microseconds < 0)
{
microseconds= -microseconds;
neg= 1;
}
*seconds_out= microseconds/1000000L;
*microseconds_out= (long) (microseconds%1000000L);
return neg;
}
Compares 2 MYSQL_TIME structures
SYNOPSIS
my_time_compare()
a - first time
b - second time
RETURN VALUE
-1 - a < b
0 - a == b
1 - a > b
*/
int my_time_compare(MYSQL_TIME *a, MYSQL_TIME *b)
{
ulonglong a_t= TIME_to_ulonglong_datetime(a);
ulonglong b_t= TIME_to_ulonglong_datetime(b);
if (a_t < b_t)
return -1;
if (a_t > b_t)
return 1;
if (a->second_part < b->second_part)
return -1;
if (a->second_part > b->second_part)
return 1;
return 0;
}
static uint msec_round_add[7]=
{
500000000,
50000000,
5000000,
500000,
50000,
5000,
0
};
Round time value to the given precision.
@param IN/OUT ltime The value to round.
@param dec Precision.
@return False on success, true on error.
*/
bool my_time_round(MYSQL_TIME *ltime, uint dec)
{
int warnings= 0;
DBUG_ASSERT(dec <= DATETIME_MAX_DECIMALS);
bool rc= time_add_nanoseconds_with_round(ltime,
msec_round_add[dec], &warnings);
my_time_trunc(ltime, dec);
return rc;
}
Round datetime value to the given precision.
@param IN/OUT ltime The value to round.
@param dec Precision.
@return False on success, true on error.
*/
bool my_datetime_round(MYSQL_TIME *ltime, uint dec, int *warnings)
{
DBUG_ASSERT(dec <= DATETIME_MAX_DECIMALS);
bool rc= datetime_add_nanoseconds_with_round(ltime,
msec_round_add[dec], warnings);
my_time_trunc(ltime, dec);
return rc;
}
Round timeval value to the given precision.
@param IN/OUT ts The value to round.
@param dec Precision.
@return False on success, true on error.
*/
bool my_timeval_round(struct timeval *tv, uint decimals)
{
DBUG_ASSERT(decimals <= DATETIME_MAX_DECIMALS);
uint nanoseconds= msec_round_add[decimals];
tv->tv_usec+= (nanoseconds + 500) / 1000;
if (tv->tv_usec < 1000000)
goto ret;
tv->tv_usec= 0;
tv->tv_sec++;
if (!IS_TIME_T_VALID_FOR_TIMESTAMP(tv->tv_sec))
{
tv->tv_sec= TIMESTAMP_MAX_VALUE;
return true;
}
ret:
my_timeval_trunc(tv, decimals);
return false;
}
Mix a date value and a time value.
@param IN/OUT ldate Date value.
@param ltime Time value.
*/
void mix_date_and_time(MYSQL_TIME *ldate, const MYSQL_TIME *ltime)
{
DBUG_ASSERT(ldate->time_type == MYSQL_TIMESTAMP_DATE ||
ldate->time_type == MYSQL_TIMESTAMP_DATETIME);
if (!ltime->neg && ltime->hour < 24)
{
Simple case: TIME is within normal 24 hours internal.
Mix DATE part of ltime2 and TIME part of ltime together.
*/
ldate->hour= ltime->hour;
ldate->minute= ltime->minute;
ldate->second= ltime->second;
ldate->second_part= ltime->second_part;
}
else
{
longlong seconds;
long days, useconds;
int sign= ltime->neg ? 1 : -1;
ldate->neg= calc_time_diff(ldate, ltime, sign, &seconds, &useconds);
DBUG_ASSERT(!ldate->neg);
We pass current date to mix_date_and_time. If we want to use
this function with arbitrary dates, this code will need
to cover cases when ltime is negative and "ldate < -ltime".
*/
DBUG_ASSERT(ldate->year > 0);
days= (long) (seconds / SECONDS_IN_24H);
calc_time_from_sec(ldate, seconds % SECONDS_IN_24H, useconds);
get_date_from_daynr(days, &ldate->year, &ldate->month, &ldate->day);
}
ldate->time_type= MYSQL_TIMESTAMP_DATETIME;
}
Convert MYSQL_TIME value to its packed numeric representation,
using field type.
@param ltime The value to convert.
@param type MySQL field type.
@retval Packed numeric representation.
*/
longlong TIME_to_longlong_packed(const MYSQL_TIME *ltime,
enum enum_field_types type)
{
switch (type)
{
case MYSQL_TYPE_TIME:
return TIME_to_longlong_time_packed(ltime);
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
return TIME_to_longlong_datetime_packed(ltime);
case MYSQL_TYPE_DATE:
return TIME_to_longlong_date_packed(ltime);
default:
return TIME_to_longlong_packed(ltime);
}
}
Convert packed numeric temporal representation to time, date or datetime,
using field type.
@param OUT ltime The variable to write to.
@param type MySQL field type.
@param packed_value Numeric datetype representation.
*/
void TIME_from_longlong_packed(MYSQL_TIME *ltime,
enum enum_field_types type,
longlong packed_value)
{
switch (type)
{
case MYSQL_TYPE_TIME:
TIME_from_longlong_time_packed(ltime, packed_value);
break;
case MYSQL_TYPE_DATE:
TIME_from_longlong_date_packed(ltime, packed_value);
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
TIME_from_longlong_datetime_packed(ltime, packed_value);
break;
default:
DBUG_ASSERT(0);
set_zero_time(ltime, MYSQL_TIMESTAMP_ERROR);
break;
}
}
Unpack packed numeric temporal value to date/time value
and then convert to decimal representation.
@param OUT dec The variable to write to.
@param type MySQL field type.
@param packed_value Packed numeric temporal representation.
@return A decimal value in on of the following formats, depending
on type: YYYYMMDD, hhmmss.ffffff or YYMMDDhhmmss.ffffff.
*/
my_decimal *my_decimal_from_datetime_packed(my_decimal *dec,
enum enum_field_types type,
longlong packed_value)
{
MYSQL_TIME ltime;
switch (type)
{
case MYSQL_TYPE_TIME:
TIME_from_longlong_time_packed(<ime, packed_value);
return time2my_decimal(<ime, dec);
case MYSQL_TYPE_DATE:
TIME_from_longlong_date_packed(<ime, packed_value);
ulonglong2decimal(TIME_to_ulonglong_date(<ime), dec);
return dec;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
TIME_from_longlong_datetime_packed(<ime, packed_value);
return date2my_decimal(<ime, dec);
default:
DBUG_ASSERT(0);
ulonglong2decimal(0, dec);
return dec;
}
}
Convert packed numeric representation to
unpacked numeric representation.
@param type MySQL field type.
@param paacked_value Packed numeric temporal value.
@return Number in one of the following formats,
depending on type: YYMMDD, YYMMDDhhmmss, hhmmss.
*/
longlong longlong_from_datetime_packed(enum enum_field_types type,
longlong packed_value)
{
MYSQL_TIME ltime;
switch (type)
{
case MYSQL_TYPE_TIME:
TIME_from_longlong_time_packed(<ime, packed_value);
return TIME_to_ulonglong_time(<ime);
case MYSQL_TYPE_DATE:
TIME_from_longlong_date_packed(<ime, packed_value);
return TIME_to_ulonglong_date(<ime);
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
TIME_from_longlong_datetime_packed(<ime, packed_value);
return TIME_to_ulonglong_datetime(<ime);
default:
DBUG_ASSERT(0);
return 0;
}
}
Convert packed numeric temporal representation to unpacked numeric
representation.
@param type MySQL field type.
@param packed_value Numeric packed temporal representation.
@return A double value in on of the following formats,
depending on type:
YYYYMMDD, hhmmss.ffffff or YYMMDDhhmmss.ffffff.
*/
double double_from_datetime_packed(enum enum_field_types type,
longlong packed_value)
{
longlong result= longlong_from_datetime_packed(type, packed_value);
return result +
((double) MY_PACKED_TIME_GET_FRAC_PART(packed_value)) / 1000000;
}
#endif