mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
f56e43ce52
Updated MySQL time handling code to react correctly on UTC leap second additions. MySQL functions that return the OS current time, like e.g. CURDATE(), NOW() etc will return :59:59 instead of :59:60 or 59:61. As a result the reader will receive :59:59 for 2 or 3 consecutive seconds during the leap second. This fix will not affect the values returned by UNIX_TIMESTAMP() for leap seconds. But note that when converting the value returned by UNIX_TIMESTAMP() to broken down time the correction of leap seconds will still be applied. Note that this fix will make a difference *only* if the OS is specially configured to return leap seconds from the OS time calls or when using a MySQL time zone defintion that has leap seconds. Even after this change date/time literals (or other broken down time representations) with leap seconds (ending on :59:60 or 59:61) will still be considered illegal and discarded by the server with an error or a warning depending on the sql mode. Added a test case to demonstrate the effect of the fix. mysql-test/r/timezone3.result: Bug #39920: test case mysql-test/std_data/Moscow_leap: Bug #39920: updated the Moscow time zone to Dr. Olson's tzdata 2008i to accomodate for the 2008 leap second mysql-test/t/timezone3.test: Bug #39920: test case sql/tztime.cc: Bug #39920: adjust leap seconds (:60 or :61) to :59 sql/tztime.h: Bug #39920: adjust leap seconds (:60 or :61) to :59
112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
/* Copyright (C) 2004 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 */
|
|
|
|
|
|
#ifdef USE_PRAGMA_INTERFACE
|
|
#pragma interface /* gcc class interface */
|
|
#endif
|
|
|
|
#if !defined(TESTTIME) && !defined(TZINFO2SQL)
|
|
|
|
/*
|
|
This class represents abstract time zone and provides
|
|
basic interface for MYSQL_TIME <-> my_time_t conversion.
|
|
Actual time zones which are specified by DB, or via offset
|
|
or use system functions are its descendants.
|
|
*/
|
|
class Time_zone: public Sql_alloc
|
|
{
|
|
public:
|
|
Time_zone() {} /* Remove gcc warning */
|
|
/*
|
|
Converts local time in broken down MYSQL_TIME representation to
|
|
my_time_t (UTC seconds since Epoch) represenation.
|
|
Returns 0 in case of error. Sets in_dst_time_gap to true if date provided
|
|
falls into spring time-gap (or lefts it untouched otherwise).
|
|
*/
|
|
virtual my_time_t TIME_to_gmt_sec(const MYSQL_TIME *t,
|
|
my_bool *in_dst_time_gap) const = 0;
|
|
/*
|
|
Converts time in my_time_t representation to local time in
|
|
broken down MYSQL_TIME representation.
|
|
*/
|
|
virtual void gmt_sec_to_TIME(MYSQL_TIME *tmp, my_time_t t) const = 0;
|
|
/*
|
|
Because of constness of String returned by get_name() time zone name
|
|
have to be already zeroended to be able to use String::ptr() instead
|
|
of c_ptr().
|
|
*/
|
|
virtual const String * get_name() const = 0;
|
|
|
|
/*
|
|
We need this only for surpressing warnings, objects of this type are
|
|
allocated on MEM_ROOT and should not require destruction.
|
|
*/
|
|
virtual ~Time_zone() {};
|
|
|
|
protected:
|
|
static inline void adjust_leap_second(MYSQL_TIME *t);
|
|
};
|
|
|
|
extern Time_zone * my_tz_UTC;
|
|
extern Time_zone * my_tz_SYSTEM;
|
|
extern TABLE_LIST * my_tz_get_table_list(THD *thd, TABLE_LIST ***global_next_ptr);
|
|
extern Time_zone * my_tz_find(const String *name, TABLE_LIST *tz_tables);
|
|
extern Time_zone * my_tz_find_with_opening_tz_tables(THD *thd, const String *name);
|
|
extern my_bool my_tz_init(THD *org_thd, const char *default_tzname, my_bool bootstrap);
|
|
extern void my_tz_free();
|
|
|
|
extern TABLE_LIST fake_time_zone_tables_list;
|
|
|
|
/*
|
|
Number of elements in table list produced by my_tz_get_table_list()
|
|
(this table list contains tables which are needed for dynamical loading
|
|
of time zone descriptions). Actually it is imlementation detail that
|
|
should not be used anywhere outside of tztime.h and tztime.cc.
|
|
*/
|
|
|
|
static const int MY_TZ_TABLES_COUNT= 4;
|
|
|
|
/*
|
|
Check if we have pointer to the begining of list of implicitly used time
|
|
zone tables, set SELECT_ACL for them and fast-forward to its end.
|
|
|
|
SYNOPSIS
|
|
my_tz_check_n_skip_implicit_tables()
|
|
table - (in/out) pointer to element of table list to check
|
|
tz_tables - list of implicitly used time zone tables received
|
|
from my_tz_get_table_list() function.
|
|
|
|
NOTE
|
|
This function relies on my_tz_get_table_list() implementation.
|
|
|
|
RETURN VALUE
|
|
TRUE - if table points to the beggining of tz_tables list
|
|
FALSE - otherwise.
|
|
*/
|
|
inline bool my_tz_check_n_skip_implicit_tables(TABLE_LIST **table,
|
|
TABLE_LIST *tz_tables)
|
|
{
|
|
if (*table == tz_tables)
|
|
{
|
|
for (int i= 0; i < MY_TZ_TABLES_COUNT; i++)
|
|
(*table)[i].grant.privilege= SELECT_ACL;
|
|
(*table)+= MY_TZ_TABLES_COUNT - 1;
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
#endif /* !defined(TESTTIME) && !defined(TZINFO2SQL) */
|