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mariadb/sql/time.cc
Martin Hansson 740b7c4e36 Bug#47925: regression of range optimizer and date comparison in 5.1.39! 
When a query was using a DATE or DATETIME value formatted
using any other separator characters beside hyphen '-', a
query with a greater-or-equal '>=' condition matching only
the greatest value in an indexed column, the result was
empty if index range scan was employed.

The range optimizer got a new feature between 5.1.38 and
5.1.39 that changes a greater-or-equal condition to a
greater-than if the value matching that in the query was not
present in the table. But the value comparison function
compared the dates as strings instead of dates.

The bug was fixed by splitting the function
get_date_from_str in two: One part that parses and does
error checking. This function is now visible outside the
module. The old get_date_from_str now calls the new
function.


mysql-test/r/range.result:
  Bug#47925: Test result
mysql-test/t/range.test:
  Bug#47925: Test case
sql/item.cc:
  Bug#47925: Fix + some edit on the comments
sql/item.h:
  Bug#47925: Changed function signature
sql/item_cmpfunc.cc:
  Bug#47925: Split function in two
sql/item_cmpfunc.h:
  Bug#47925: Declaration of new function
sql/opt_range.cc:
  Bug#47925: Added THD to function call
sql/time.cc:
  Bug#47925: Added microsecond comparison
2009-11-02 13:24:07 +01:00

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/* Copyright (C) 2000-2006 MySQL AB
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Functions to handle date and time */
#include "mysql_priv.h"
#include <m_ctype.h>
/* Some functions to calculate dates */
#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")}
};
/* 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= test(week_behaviour & WEEK_MONDAY_FIRST);
bool week_year= test(week_behaviour & WEEK_YEAR);
bool first_weekday= 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 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.
*/
timestamp_type
str_to_datetime_with_warn(const char *str, uint length, MYSQL_TIME *l_time,
uint flags)
{
int was_cut;
THD *thd= current_thd;
timestamp_type ts_type;
ts_type= str_to_datetime(str, length, l_time,
(flags | (thd->variables.sql_mode &
(MODE_INVALID_DATES |
MODE_NO_ZERO_DATE))),
&was_cut);
if (was_cut || ts_type <= MYSQL_TIMESTAMP_ERROR)
make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
str, length, ts_type, NullS);
return ts_type;
}
/*
Convert a datetime from broken-down MYSQL_TIME representation to corresponding
TIMESTAMP value.
SYNOPSIS
TIME_to_timestamp()
thd - current thread
t - datetime in broken-down representation,
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
Number seconds in UTC since start of Unix Epoch corresponding to t.
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;
thd->time_zone_used= 1;
timestamp= thd->variables.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 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(const char *str, uint length, MYSQL_TIME *l_time)
{
int warning;
bool ret_val= str_to_time(str, length, l_time, &warning);
if (ret_val || warning)
make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
str, length, MYSQL_TIMESTAMP_TIME, NullS);
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, long 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;
to->hour= seconds/3600L;
t_seconds= 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;
/* 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;
LINT_INIT(position);
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 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)
{
/* 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((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); // 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.
****************************************************************************/
void make_time(const DATE_TIME_FORMAT *format __attribute__((unused)),
const MYSQL_TIME *l_time, String *str)
{
uint length= (uint) my_time_to_str(l_time, (char*) str->ptr());
str->length(length);
str->set_charset(&my_charset_bin);
}
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_bin);
}
void make_datetime(const DATE_TIME_FORMAT *format __attribute__((unused)),
const MYSQL_TIME *l_time, String *str)
{
uint length= (uint) my_datetime_to_str(l_time, (char*) str->ptr());
str->length(length);
str->set_charset(&my_charset_bin);
}
void make_truncated_value_warning(THD *thd, MYSQL_ERROR::enum_warning_level level,
const char *str_val,
uint str_length, timestamp_type time_type,
const char *field_name)
{
char warn_buff[MYSQL_ERRMSG_SIZE];
const char *type_str;
CHARSET_INFO *cs= &my_charset_latin1;
char buff[128];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.copy(str_val, str_length, system_charset_info);
str[str_length]= 0; // Ensure we have end 0 for snprintf
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, str.c_ptr(), field_name,
(ulong) thd->row_count);
else
{
if (time_type > MYSQL_TIMESTAMP_ERROR)
cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),
ER(ER_TRUNCATED_WRONG_VALUE),
type_str, str.c_ptr());
else
cs->cset->snprintf(cs, warn_buff, sizeof(warn_buff),
ER(ER_WRONG_VALUE), type_str, str.c_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*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;
/* 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, MYSQL_ERROR::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(MYSQL_TIME *l_time1, 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*LL(86400) +
(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;
}
#endif
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