MySQL  8.0.27
Source Code Documentation
sql_time.h
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1 /* Copyright (c) 2006, 2021, Oracle and/or its affiliates.
2 
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4  it under the terms of the GNU General Public License, version 2.0,
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14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  GNU General Public License, version 2.0, for more details.
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19  You should have received a copy of the GNU General Public License
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21  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22 
23 #ifndef SQL_TIME_INCLUDED
24 #define SQL_TIME_INCLUDED
25 
26 /**
27  @ingroup SQL_TIME
28  @{
29 
30  @file sql/sql_time.h
31 
32  Interface for server time utilities.
33 */
34 
35 #include "my_config.h"
36 
37 #include <stddef.h>
38 #ifdef HAVE_SYS_TIME_H
39 #include <sys/time.h>
40 #endif
41 #include <sys/types.h>
42 
43 #include "field_types.h" // enum_field_types
44 #include "lex_string.h"
45 #include "m_ctype.h"
46 #include "my_dbug.h"
47 #include "my_inttypes.h"
48 #include "my_time.h"
49 #include "mysql_time.h" /* enum_mysql_timestamp_type */
50 #include "sql/sql_error.h" /* Sql_condition */
51 #include "sql_string.h"
52 
53 class THD;
54 class Time_zone;
55 class my_decimal;
56 
57 /**
58  Representation of time formats.
59  */
63 };
64 
65 /**
66  Collection of strings describing date/time formats.
67  */
69  const char *format_name;
70  const char *date_format;
71  const char *datetime_format;
72  const char *time_format;
73 };
74 
76  bool *not_exist);
78  const Time_zone &tz,
79  struct timeval *tm,
80  int *warnings);
81 bool datetime_to_timeval(const MYSQL_TIME *t, const Time_zone &tz,
82  struct timeval *tm, int *warnings);
87 bool my_double_to_datetime_with_warn(double nr, MYSQL_TIME *ltime,
91 bool my_decimal_to_time_with_warn(const my_decimal *decimal, MYSQL_TIME *ltime);
92 bool my_double_to_time_with_warn(double nr, MYSQL_TIME *ltime);
95 void time_to_datetime(THD *thd, const MYSQL_TIME *tm, const Time_zone &tz,
96  MYSQL_TIME *dt);
97 void time_to_datetime(THD *thd, const MYSQL_TIME *in, MYSQL_TIME *out);
98 
101  const ErrConvString &val,
102  enum_mysql_timestamp_type time_type,
103  const char *field_name);
104 
105 const char *get_date_time_format_str(const Known_date_time_format *format,
107 void make_date(const Date_time_format *format, const MYSQL_TIME *l_time,
108  String *str);
109 void make_time(const Date_time_format *format, const MYSQL_TIME *l_time,
110  String *str, uint dec);
111 void make_datetime(const Date_time_format *format, const MYSQL_TIME *l_time,
112  String *str, uint dec);
113 bool my_TIME_to_str(const MYSQL_TIME *ltime, String *str, uint dec);
114 
115 void propagate_datetime_overflow_helper(THD *thd, int *warnings);
116 
117 /**
118  Wrapper function which will propagate any DATETIME_OVERFLOW warnings
119  to the THD. Overload for the case where a warnings bitset already
120  exists which can be inspected before the value of the mysys
121  function is passed on.
122 
123  @param thd Thread context
124  @param warnings bitset used mysys function
125  @param t value mysys function which is passed on
126  @returns t
127  */
128 template <class T>
129 inline T propagate_datetime_overflow(THD *thd, int *warnings, T t) {
130  propagate_datetime_overflow_helper(thd, warnings);
131  return t;
132 }
133 
134 /**
135  Wrapper function which will propagate any DATETIME_OVERFLOW warnings
136  to the THD. Overload for the case when a warnings bitset must be
137  created and inspected to call a mysys function. The mysys function
138  must be invoked by the closure argument which invoked with a
139  pointer to the warnings bitset as argument.
140 
141  @param thd Thread context
142  @param clos closure to call with empty warnings bitset
143  @return return value of closure
144  */
145 template <class CLOS>
146 inline auto propagate_datetime_overflow(THD *thd, CLOS &&clos) {
147  int warnings = 0;
148  return propagate_datetime_overflow(thd, &warnings, clos(&warnings));
149 }
150 
152  interval_type int_type, Interval interval);
153 
154 bool str_to_time(const CHARSET_INFO *cs, const char *str, size_t length,
157 
158 /**
159  Converts a time String value to MYSQL_TIME. Forwards to the version
160  taking an explicit charset, c-string and length.
161 
162  @return False on success, true on error.
163  */
164 inline bool str_to_time(const String *str, MYSQL_TIME *ltime,
166  return str_to_time(str->charset(), str->ptr(), str->length(), ltime, flags,
167  status);
168 }
169 
170 bool str_to_datetime(const CHARSET_INFO *cs, const char *str, size_t length,
173 
174 /**
175  Converts a datetime String value to MYSQL_TIME. Forwards to the
176  version taking an explicit charset, c-string and length.
177 
178  @return False on success, true on error.
179 */
180 inline bool str_to_datetime(const String *str, MYSQL_TIME *ltime,
182  return str_to_datetime(str->charset(), str->ptr(), str->length(), ltime,
183  flags, status);
184 }
185 
186 extern const LEX_CSTRING interval_type_to_name[];
187 
189  enum enum_field_types type,
190  longlong packed_value);
191 
192 /**
193  Return the timstamp value corresponding the field type passed as argument.
194 
195  @param type field type
196  @return corresponding timestamp type
197  */
199  enum enum_field_types type) {
200  switch (type) {
201  case MYSQL_TYPE_TIME:
202  return MYSQL_TIMESTAMP_TIME;
203  case MYSQL_TYPE_DATE:
204  return MYSQL_TIMESTAMP_DATE;
206  case MYSQL_TYPE_DATETIME:
208  default:
209  return MYSQL_TIMESTAMP_NONE;
210  }
211 }
212 
213 /**
214  This function gets GMT time and adds value of time_zone to get
215  the local time. This function is used when server wants a timestamp
216  value from dictionary system.
217 
218  @return time converted to local time
219 */
220 
222 
223 /**
224  In lieu of a proper constructor for the C struct MYSQL_TIME, this method
225  initializes the struct.
226 */
227 MYSQL_TIME my_time_set(uint y, uint m, uint d, uint h, uint mi, uint s,
228  unsigned long ms, bool negative,
230 /**
231  Return the number of significant second fraction decimals in ts, e.g.
232  for ts->second_part == 120300, return 4.
233 
234  @param ts the time value for which we wnat the number of decmals
235  @return the number of decimals
236 */
237 uint actual_decimals(const MYSQL_TIME *ts);
238 
239 /**
240  For a time fraction with a given number of decimals, return maximum fraction,
241  if any, can be are present in a time value. For example, if 2 decimals are
242  specified, return 990000. If none, 0.
243 
244  @param decimals the number of decimals
245  @return the maximum fraction
246 */
247 size_t max_fraction(uint decimals);
248 
249 /**
250  @} (end of ingroup SQL_TIME)
251 */
252 
253 #endif /* SQL_TIME_INCLUDED */
Definition: sql_error.h:221
enum_severity_level
Enumeration value describing the severity of the condition.
Definition: sql_error.h:59
Using this class is fraught with peril, and you need to be very careful when doing so.
Definition: sql_string.h:165
For each client connection we create a separate thread with THD serving as a thread/connection descri...
Definition: sql_class.h:821
This class represents abstract time zone and provides basic interface for MYSQL_TIME <-> my_time_t co...
Definition: tztime.h:48
my_decimal class limits 'decimal_t' type to what we need in MySQL.
Definition: my_decimal.h:92
This file contains the field type.
enum_field_types
Column types for MySQL.
Definition: field_types.h:57
@ MYSQL_TYPE_TIME
Definition: field_types.h:68
@ MYSQL_TYPE_DATE
Definition: field_types.h:67
@ MYSQL_TYPE_TIMESTAMP
Definition: field_types.h:64
@ MYSQL_TYPE_DATETIME
Definition: field_types.h:69
static const std::string dec("DECRYPTION")
const char * get_date_time_format_str(const Known_date_time_format *format, enum_mysql_timestamp_type type)
Return format string according format name.
Definition: sql_time.cc:564
bool make_truncated_value_warning(THD *thd, Sql_condition::enum_severity_level level, const ErrConvString &val, enum_mysql_timestamp_type time_type, const char *field_name)
Create and add a truncated value warning to the THD.
Definition: sql_time.cc:654
void make_time(const Date_time_format *format, const MYSQL_TIME *l_time, String *str, uint dec)
bool my_double_to_datetime_with_warn(double nr, MYSQL_TIME *ltime, my_time_flags_t flags)
Convert double value to datetime value with a warning.
Definition: sql_time.cc:267
bool date_add_interval_with_warn(THD *, MYSQL_TIME *ltime, interval_type int_type, Interval interval)
Uses propagate_datetime_overflow() to handle and propagate any warnings from date_add_interval() to t...
Definition: sql_time.cc:702
bool str_to_time_with_warn(String *str, MYSQL_TIME *l_time)
Convert a time string to a MYSQL_TIME struct and produce a warning if string was cut during conversio...
Definition: sql_time.cc:519
void make_datetime(const Date_time_format *format, const MYSQL_TIME *l_time, String *str, uint dec)
T propagate_datetime_overflow(THD *thd, int *warnings, T t)
Wrapper function which will propagate any DATETIME_OVERFLOW warnings to the THD.
Definition: sql_time.h:129
ulonglong gmt_time_to_local_time(ulonglong time)
This function gets GMT time and adds value of time_zone to get the local time.
Definition: sql_time.cc:765
uint actual_decimals(const MYSQL_TIME *ts)
Return the number of significant second fraction decimals in ts, e.g.
Definition: sql_time.cc:792
bool my_double_to_time_with_warn(double nr, MYSQL_TIME *ltime)
Convert double number to TIME.
Definition: sql_time.cc:371
my_decimal * my_decimal_from_datetime_packed(my_decimal *dec, enum enum_field_types type, longlong packed_value)
Unpack packed numeric temporal value to date/time value and then convert to decimal representation.
Definition: sql_time.cc:734
bool my_longlong_to_time_with_warn(longlong nr, MYSQL_TIME *ltime)
Convert longlong number to TIME.
Definition: sql_time.cc:399
void propagate_datetime_overflow_helper(THD *thd, int *warnings)
Propagates a DATETIME_OVERFLOW warning from warnings bitfield to DA in thd.
Definition: sql_time.cc:715
const LEX_CSTRING interval_type_to_name[]
Name description of interval names used in statements.
Definition: sql_time.cc:68
enum_mysql_timestamp_type field_type_to_timestamp_type(enum enum_field_types type)
Return the timstamp value corresponding the field type passed as argument.
Definition: sql_time.h:198
size_t max_fraction(uint decimals)
For a time fraction with a given number of decimals, return maximum fraction, if any,...
Definition: sql_time.cc:801
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)
Character set-aware version of str_to_time().
Definition: sql_time.cc:126
bool datetime_with_no_zero_in_date_to_timeval(const MYSQL_TIME *t, const Time_zone &tz, struct timeval *tm, int *warnings)
Converts a datetime in MYSQL_TIME representation to corresponding struct timeval value.
Definition: sql_time.cc:438
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)
Character set-aware version of str_to_datetime().
Definition: sql_time.cc:147
void make_date(const Date_time_format *format, const MYSQL_TIME *l_time, String *str)
MYSQL_TIME my_time_set(uint y, uint m, uint d, uint h, uint mi, uint s, unsigned long ms, bool negative, enum_mysql_timestamp_type type)
In lieu of a proper constructor for the C struct MYSQL_TIME, this method initializes the struct.
Definition: sql_time.cc:786
bool str_to_datetime_with_warn(String *str, MYSQL_TIME *l_time, my_time_flags_t flags)
Convert a timestamp string to a MYSQL_TIME value and produce a warning if string was truncated during...
Definition: sql_time.cc:172
bool my_TIME_to_str(const MYSQL_TIME *ltime, String *str, uint dec)
Convert TIME/DATE/DATETIME value to String.
Definition: sql_time.cc:642
bool my_longlong_to_datetime_with_warn(longlong nr, MYSQL_TIME *ltime, my_time_flags_t flags)
Convert longlong value to datetime value with a warning.
Definition: sql_time.cc:298
bool datetime_to_timeval(const MYSQL_TIME *t, const Time_zone &tz, struct timeval *tm, int *warnings)
Convert a datetime MYSQL_TIME representation to corresponding "struct timeval" value.
Definition: sql_time.cc:504
bool my_decimal_to_datetime_with_warn(const my_decimal *decimal, MYSQL_TIME *ltime, my_time_flags_t flags)
Convert decimal value to datetime value with a warning.
Definition: sql_time.cc:235
bool my_decimal_to_time_with_warn(const my_decimal *decimal, MYSQL_TIME *ltime)
Convert decimal number to TIME.
Definition: sql_time.cc:341
my_time_t TIME_to_timestamp(const MYSQL_TIME *t, const Time_zone &tz, bool *not_exist)
void time_to_datetime(THD *thd, const MYSQL_TIME *tm, const Time_zone &tz, MYSQL_TIME *dt)
static int flags[50]
Definition: hp_test1.cc:39
A better implementation of the UNIX ctype(3) library.
Some integer typedefs for easier portability.
unsigned long long int ulonglong
Definition: my_inttypes.h:55
unsigned char uchar
Definition: my_inttypes.h:51
long long int longlong
Definition: my_inttypes.h:54
Interface for low level time utilities.
[] long int my_time_t
Portable time_t replacement.
unsigned int my_time_flags_t
Flags to str_to_datetime and number_to_datetime.
Definition: my_time.h:82
interval_type
Available interval types used in any statement.
Definition: my_time.h:403
Time declarations shared between the server and client API: you should not add anything to this heade...
enum_mysql_timestamp_type
Definition: mysql_time.h:44
@ MYSQL_TIMESTAMP_TIME
Stores hour, minute, second and microsecond.
Definition: mysql_time.h:59
@ MYSQL_TIMESTAMP_DATETIME
Stores all date and time components.
Definition: mysql_time.h:56
@ MYSQL_TIMESTAMP_DATE
Stores year, month and day components.
Definition: mysql_time.h:49
@ MYSQL_TIMESTAMP_NONE
Definition: mysql_time.h:45
static int interval
Definition: mysqladmin.cc:64
std::string str(const mysqlrouter::ConfigGenerator::Options::Endpoint &ep)
Definition: config_generator.cc:1056
Definition: commit_order_queue.h:33
bool length(const dd::Spatial_reference_system *srs, const Geometry *g1, double *length, bool *null) noexcept
Computes the length of linestrings and multilinestrings.
Definition: length.cc:75
required uint32 status
Definition: replication_asynchronous_connection_failover.proto:60
required string type
Definition: replication_group_member_actions.proto:33
Our own string classes, used pervasively throughout the executor.
Definition: m_ctype.h:354
Representation of time formats.
Definition: sql_time.h:60
LEX_CSTRING format
Definition: sql_time.h:62
uchar positions[8]
Definition: sql_time.h:61
Struct representing a duration.
Definition: my_time.h:168
Collection of strings describing date/time formats.
Definition: sql_time.h:68
const char * time_format
Definition: sql_time.h:72
const char * datetime_format
Definition: sql_time.h:71
const char * date_format
Definition: sql_time.h:70
const char * format_name
Definition: sql_time.h:69
Definition: mysql_lex_string.h:39
Structure to return status from str_to_datetime(), str_to_time(), number_to_datetime(),...
Definition: my_time.h:158
Definition: mysql_time.h:81
Include file for Sun RPC to compile out of the box.
unsigned int uint
Definition: uca-dump.cc:29