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mysql5/mysql-5.7.27/sql/sql_time.cc

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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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 */
/* Functions to handle date and time */
#include "sql_time.h"
#include "tztime.h" // struct Time_zone
#include "sql_class.h" // THD, MODE_STRICT_ALL_TABLES, MODE_STRICT_TRANS_TABLES
#include <m_ctype.h>
#include "item_timefunc.h" // INTERNAL_FORMAT
/* Some functions to calculate dates */
/*
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")}
};
/* Calc weekday from daynr */
/* Returns 0 for monday, 1 for tuesday .... */
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;
}
/* Change a daynr to year, month and day */
/* Daynr 0 is returned as date 00.00.00 */
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)
{ /* Fix if wrong daynr */
*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; /* Handle leapyears leapday */
}
}
*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;
}
/* Functions to handle periods */
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, size_t src_length,
char *dst, size_t 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++= static_cast<char>(wc);
}
*dst= '\0';
return dst - dst0;
}
/* Character set-aware version of str_to_time() */
bool str_to_time(const CHARSET_INFO *cs, const char *str, size_t length,
MYSQL_TIME *l_time, my_time_flags_t flags,
MYSQL_TIME_STATUS *status)
{
char cnv[MAX_TIME_FULL_WIDTH + 3]; // +3 for nanoseconds (for rounding)
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));
}
/* Character set-aware version of str_to_datetime() */
bool str_to_datetime(const CHARSET_INFO *cs,
const char *str, size_t length,
MYSQL_TIME *l_time, my_time_flags_t flags,
MYSQL_TIME_STATUS *status)
{
char cnv[MAX_DATETIME_FULL_WIDTH + 3]; // +3 for nanoseconds (for rounding)
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)
{
/* We expect correct input data */
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;
/* date_add_interval cannot handle bad dates */
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,
my_time_flags_t flags)
{
MYSQL_TIME_STATUS status;
THD *thd= current_thd;
if (thd->variables.sql_mode & MODE_NO_ZERO_DATE)
flags|= TIME_NO_ZERO_DATE;
if (thd->variables.sql_mode & MODE_INVALID_DATES)
flags|= TIME_INVALID_DATES;
bool ret_val= str_to_datetime(str, l_time, flags, &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,
my_time_flags_t flags, int *warnings)
{
if (lld.rem < 0 || // Catch negative numbers with zero int part, e.g: -0.1
number_to_datetime(lld.quot, ltime, flags, warnings) == -1LL)
{
/* number_to_datetime does not clear ltime in case of ZERO DATE */
set_zero_time(ltime, MYSQL_TIMESTAMP_ERROR);
if (!*warnings) /* Neither sets warnings in case of ZERO DATE */
*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= static_cast<ulong>(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, my_time_flags_t 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,
my_time_flags_t 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,
my_time_flags_t flags)
{
int warnings= 0;
bool rc= number_to_datetime(nr, ltime, flags, &warnings) == -1LL;
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= static_cast<ulong>(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.
@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.
@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.
@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 datetime from broken-down MYSQL_TIME representation
to corresponding TIMESTAMP value.
@param thd - current thread
@param t - datetime in broken-down representation,
@param in_dst_time_gap - pointer to bool which is set to true if t represents
value which doesn't exists (falls into the spring
time-gap) or to false otherwise.
@return
@retval Number seconds in UTC since start of Unix Epoch corresponding to t.
@retval 0 - t contains datetime value which is out of TIMESTAMP range.
*/
my_time_t TIME_to_timestamp(THD *thd, const MYSQL_TIME *t, my_bool *in_dst_time_gap)
{
my_time_t timestamp;
*in_dst_time_gap= 0;
timestamp= thd->time_zone()->TIME_to_gmt_sec(t, in_dst_time_gap);
if (timestamp)
{
return timestamp;
}
/* If we are here we have range error. */
return(0);
}
/**
Convert a datetime MYSQL_TIME representation
to corresponding "struct timeval" value.
ltime must previously be checked for TIME_NO_ZERO_IN_DATE.
Things like '0000-01-01', '2000-00-01', '2000-01-00' are not allowed
and asserted.
Things like '0000-00-00 10:30:30' or '0000-00-00 00:00:00.123456'
(i.e. empty date with non-empty time) return error.
Zero datetime '0000-00-00 00:00:00.000000'
is allowed and is mapper to {tv_sec=0, tv_usec=0}.
Note: In case of error, tm value is not initialized.
Note: "warnings" is not initialized to zero,
so new warnings are added to the old ones.
Caller must make sure to initialize "warnings".
@param[in] thd current thd
@param[in] ltime datetime value
@param[out] tm timeval value
@param[out] warnings pointer to warnings vector
@return
@retval false on success
@retval true on error
*/
bool datetime_with_no_zero_in_date_to_timeval(THD *thd,
const MYSQL_TIME *ltime,
struct timeval *tm,
int *warnings)
{
if (!ltime->month) /* Zero date */
{
DBUG_ASSERT(!ltime->year && !ltime->day);
if (non_zero_time(ltime))
{
/*
Return error for zero date with non-zero time, e.g.:
'0000-00-00 10:20:30' or '0000-00-00 00:00:00.123456'
*/
*warnings|= MYSQL_TIME_WARN_TRUNCATED;
return true;
}
tm->tv_sec= tm->tv_usec= 0; // '0000-00-00 00:00:00.000000'
return false;
}
my_bool in_dst_time_gap;
if (!(tm->tv_sec= TIME_to_timestamp(current_thd, ltime, &in_dst_time_gap)))
{
/*
Date was outside of the supported timestamp range.
For example: '3001-01-01 00:00:00' or '1000-01-01 00:00:00'
*/
*warnings|= MYSQL_TIME_WARN_OUT_OF_RANGE;
return true;
}
else if (in_dst_time_gap)
{
/*
Set MYSQL_TIME_WARN_INVALID_TIMESTAMP warning to indicate
that date was fine but pointed to winter/summer time switch gap.
In this case tm is set to the fist second after gap.
For example: '2003-03-30 02:30:00 MSK' -> '2003-03-30 03:00:00 MSK'
*/
*warnings|= MYSQL_TIME_WARN_INVALID_TIMESTAMP;
}
tm->tv_usec= ltime->second_part;
return false;
}
/**
Convert a datetime MYSQL_TIME representation
to corresponding "struct timeval" value.
Things like '0000-01-01', '2000-00-01', '2000-01-00'
(i.e. incomplete date) return error.
Things like '0000-00-00 10:30:30' or '0000-00-00 00:00:00.123456'
(i.e. empty date with non-empty time) return error.
Zero datetime '0000-00-00 00:00:00.000000'
is allowed and is mapper to {tv_sec=0, tv_usec=0}.
Note: In case of error, tm value is not initialized.
Note: "warnings" is not initialized to zero,
so new warnings are added to the old ones.
Caller must make sure to initialize "warnings".
@param[in] thd current thd
@param[in] ltime datetime value
@param[out] tm timeval value
@param[out] warnings pointer to warnings vector
@return
@retval false on success
@retval true on error
*/
bool datetime_to_timeval(THD *thd, const MYSQL_TIME *ltime,
struct timeval *tm, int *warnings)
{
return
check_date(ltime, non_zero_date(ltime), TIME_NO_ZERO_IN_DATE, warnings) ||
datetime_with_no_zero_in_date_to_timeval(current_thd, ltime, tm, warnings);
}
/*
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 time to datetime.
The time value is added to the current datetime value.
@param IN ltime Time value to convert from.
@param OUT ltime2 Datetime value to convert to.
*/
void time_to_datetime(THD *thd, const MYSQL_TIME *ltime, MYSQL_TIME *ltime2)
{
thd->variables.time_zone->gmt_sec_to_TIME(ltime2,
static_cast<my_time_t>(thd->query_start()));
ltime2->hour= ltime2->minute= ltime2->second= ltime2->second_part= 0;
ltime2->time_type= MYSQL_TIMESTAMP_DATE;
mix_date_and_time(ltime2, ltime);
}
/*
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->neg is not cleared, it may already be set to a useful value
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
@param format_type Format of string (time, date or datetime)
@date_time_format Format to fill in
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 true if error, false otherwise.
*/
bool parse_date_time_format(timestamp_type format_type,
Date_time_format *date_time_format)
{
const char *format= date_time_format->format.str;
size_t format_length= date_time_format->format.length;
uint offset= 0, separators= 0;
const char *ptr= format, *format_str;
const char *end= ptr+format_length;
uchar *dt_pos= date_time_format->positions;
/* need_p is set if we are using AM/PM format */
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; // For future
/*
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= 0;
switch (*++ptr) {
case 'y': // Year
case 'Y':
position= 0;
break;
case 'c': // Month
case 'm':
position= 1;
break;
case 'd':
case 'e':
position= 2;
break;
case 'h':
case 'I':
case 'l':
need_p= 1; // Need AM/PM
/* Fall through */
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; // Wrong usage of %f
break;
case 'p': // AM/PM
if (offset == 0) // Can't be first
return 0;
position= 7;
break;
default:
return 1; // Unknown controll char
}
if (dt_pos[position] != 255) // Don't allow same tag twice
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; // No separator here
allow_separator= 0; // Don't allow two separators
separators++;
/* Store in separator_map which parts are punct characters */
if (my_ispunct(&my_charset_latin1, *ptr))
separator_map|= (ulong) 1 << (offset-1);
else if (!my_isspace(&my_charset_latin1, *ptr))
return 1;
}
}
/* If no %f, specify it after seconds. Move %p up, if necessary */
if ((part_map & 32) && !(part_map & 64))
{
dt_pos[6]= dt_pos[5] +1;
parts[6]= parts[5]; // For later test in (need_p)
if (dt_pos[6] == dt_pos[7]) // Move %p one step up if used
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 || // %option should be last
(need_p && dt_pos[6] +1 != dt_pos[7]) ||
(need_p ^ (dt_pos[7] != 255)))
return 1;
if (dt_pos[6] != 255) // If fractional seconds
{
/* remove fractional seconds from later tests */
uint pos= dt_pos[6] -1;
/* Remove separator before %f from sep map */
separator_map= ((separator_map & ((ulong) (1 << pos)-1)) |
((separator_map & ~((ulong) (1 << pos)-1)) >> 1));
if (part_map & 64)
{
separators--; // There is always a separator
need_p= 1; // force use of separators
}
}
/*
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;
/* Remove separator before %p from sep map */
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;
/* fall through */
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; // Error
/* Store the character used for time formats */
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; // Error
}
/*
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;
size_t 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(key_memory_DATE_TIME_FORMAT,
length, MYF(MY_WME));
if (new_format)
{
/* Put format string after current pos */
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;
/* We make the string null terminated for easy printf in SHOW VARIABLES */
memcpy(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); // Impossible
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 convert to
@param dec Number of fractional digits.
*/
void make_time(const Date_time_format *format MY_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 convert to
*/
void make_date(const Date_time_format *format MY_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 convert to
@param dec Number of fractional digits.
*/
void make_datetime(const Date_time_format *format MY_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 convert 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_severity_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: // FALLTHROUGH
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,
(long) thd->get_stmt_da()->current_row_for_condition());
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);
}
/* Daynumber from year 0 to 9999-12-31 */
#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; // Return full date
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*3600LL+interval.minute*60LL+
interval.second))+ extra_sec;
if (microseconds < 0)
{
microseconds+= 1000000LL;
sec--;
}
days= sec/(3600*24LL);
sec-= days*3600*24LL;
if (sec < 0)
{
days--;
sec+= 3600*24LL;
}
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;
/* Day number from year 0 to 9999-12-31 */
if ((ulonglong) daynr > MAX_DAY_NUMBER)
goto invalid_date;
get_date_from_daynr((long) daynr, &ltime->year, &ltime->month,
&ltime->day);
break;
}
case INTERVAL_DAY:
case INTERVAL_WEEK:
period= (calc_daynr(ltime->year,ltime->month,ltime->day) +
sign * (long) interval.day);
/* Daynumber from year 0 to 9999-12-31 */
if ((ulong) period > MAX_DAY_NUMBER)
goto invalid_date;
get_date_from_daynr((long) period,&ltime->year,&ltime->month,&ltime->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; // Was leap-year
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;
/* Adjust day if the new month doesn't have enough days */
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++; // Leap-year
}
break;
default:
goto null_date;
}
return 0; // Ok
invalid_date:
push_warning_printf(current_thd, Sql_condition::SL_WARNING,
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) // Time value
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)) * 1000000LL +
(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;
}
/* Rounding functions */
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);
/* Add half away from zero */
bool rc= time_add_nanoseconds_with_round(ltime,
msec_round_add[dec], &warnings);
/* Truncate non-significant digits */
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);
/* Add half away from zero */
bool rc= datetime_add_nanoseconds_with_round(ltime,
msec_round_add[dec], warnings);
/* Truncate non-significant digits */
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
{
/* Complex case: TIME is negative or outside of 24 hours internal. */
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(&ltime, packed_value);
return time2my_decimal(&ltime, dec);
case MYSQL_TYPE_DATE:
TIME_from_longlong_date_packed(&ltime, packed_value);
ulonglong2decimal(TIME_to_ulonglong_date(&ltime), dec);
return dec;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
TIME_from_longlong_datetime_packed(&ltime, packed_value);
return date2my_decimal(&ltime, 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(&ltime, packed_value);
return TIME_to_ulonglong_time(&ltime);
case MYSQL_TYPE_DATE:
TIME_from_longlong_date_packed(&ltime, packed_value);
return TIME_to_ulonglong_date(&ltime);
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
TIME_from_longlong_datetime_packed(&ltime, packed_value);
return TIME_to_ulonglong_datetime(&ltime);
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;
}
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