in my table i have a column named timstamp_col , i have trigger BEFORE UPDATE on the table .
basically what i want is (in the trigger) to extend timstamp_col by 1 hour if there is more than 1 hour left till the timstamp_col value expires , or by 30 minute if there is less then 1 hour left til timstamp_col expires
im not sure how can i check how much time left (in minutes preferably) till the timestampl value expires ... i want something like this
pleas ignore syntax errors
DELIMITER $$
CREATE TRIGGER update_timestamp BEFORE UPDATE
ON table
FOR EACH ROW BEGIN
IF OLD.timstamp_col - NOW() > 60 THEN
SET NEW.timestamp_col = NOW() + INTERVAL 1 HOUR
END IF ;
IF OLD.timstamp_col - NOW() < 60 THEN
SET NEW.timestamp_col = NOW() + INTERVAL 30 MINUTE;
END IF ;
END$$
DELIMITER ;
you are looking for UNIX_TIMESTAMP , it calculates time in seconds
IF UNIX_TIMESTAMP(OLD.timstamp_col) - UNIX_TIMESTAMP() < 3600 THEN
SET NEW.timestamp_col = NOW() + INTERVAL 30 MINUTE;
END IF ;
Related
I have a field of time Timestamp in my MySQL database which is mapped to a DATE datatype in my bean. Now I want a query by which I can fetch all records in the database for which the difference between the current timestamp and the one stored in the database is > 20 minutes.
How can I do it?
What i want is:
SELECT * FROM MyTab T WHERE T.runTime - now > 20 minutes
Are there any MySQL functions for this, or any way to do this in SQL?
If you have MySql version above 5.6 you could use TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) something like
select * from MyTab T where
TIMESTAMPDIFF(MINUTE,T.runTime,NOW()) > 20
MySql version >=5.6
I am using below code for today and database date.
TIMESTAMPDIFF(MINUTE,T.runTime,NOW()) > 20
According to the documentation, the first argument can be any of the following:
MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
ROUND(time_to_sec((TIMEDIFF(NOW(), "2015-06-10 20:15:00"))) / 60);
Try this one:
select * from MyTab T where date_add(T.runTime, INTERVAL 20 MINUTE) < NOW()
NOTE: this should work if you're using MySQL DateTime format. If you're using Unix Timestamp (integer), then it would be even easier:
select * from MyTab T where UNIX_TIMESTAMP() - T.runTime > 20*60
UNIX_TIMESTAMP() function returns you current unix timestamp.
You can try this:
SELECT * FROM MyTab T WHERE CURRENT_TIMESTAMP() > T.runTime + INTERVAL 20 MINUTE;
The CURRENT_TIMESTAMP() is a function and returns the current date and time. This function works From MySQL 4.0
If you have MySql version prior than 5.6 you don't have TIMESTAMPDIFF. So,I wrote my own MySql function to do this. Accets %i or %m for minutes and %h for hours. You can extend it.
Example of usage:
SELECT MYTSDIFF('2001-01-01 10:44:32', '2001-01-01 09:50:00', '%h')
Here goes the function. Enjoy:
DROP FUNCTION IF EXISTS MYTSDIFF;
DELIMITER $$
CREATE FUNCTION `MYTSDIFF`( date1 timestamp, date2 timestamp, fmt varchar(20))
returns varchar(20) DETERMINISTIC
BEGIN
declare secs smallint(2);
declare mins smallint(2);
declare hours int;
declare total real default 0;
declare str_total varchar(20);
if date1 > DATE_ADD( date2, interval 30 day) then
return '999999.999'; /* OUT OF RANGE TIMEDIFF */
end if;
select cast( time_format( timediff(date1, date2), '%s') as signed) into secs;
select cast( time_format( timediff(date1, date2), '%i') as signed) into mins;
select cast( time_format( timediff(date1, date2), '%H') as signed) into hours;
set total = hours * 3600 + mins * 60 + secs;
set fmt = LOWER( fmt);
if fmt = '%m' or fmt = '%i' then
set total = total / 60;
elseif fmt = '%h' then
set total = total / 3600;
else
/* Do nothing, %s is the default: */
set total = total + 0;
end if;
select cast( total as char(20)) into str_total;
return str_total;
END$$
DELIMITER ;
I have a query :
insert into fookoo_business
select stat_date, sum(spend), sum(revenue)
from hooloo_business;
that i want to run for each date from '2017-01-20' until yesterday (it means the query will run 434 times if we're at 01/04/2018), for each date separately
(in a loop).
how can i create a loop in Mysql to do it for me?
I have tried:
creating procedure for the query select #stat_date, sum(spend), sum(revenue)
I called 'query'
then :
CREATE PROCEDURE loop_procedure()
BEGIN
SET #stat_date='2018-03-20';
CALL 'query';
REPEAT
SET #stat_date = #stat_date + INTERVAL 1 DAY;
UNTIL #stat_date = CURDATE() END REPEAT;
END
eventually i've used the following logic within a stored procedure to fetch the data:
PROCEDURE `x_monitoring_loop`()
BEGIN
DECLARE i INT;
DECLARE len INT;
SET len = 434;
SET i = 0;
WHILE (i < len) DO
SET #stat_date= CURDATE()-INTERVAL 1 DAY;
SET #stat_date= #stat_date- INTERVAL i DAY;
Insert query;
SET i = i +1;
END WHILE;
This way the query ran 434 times for each day, beginning at current date - 1 day.
I do not know why you want to use a procedure,I think we can just use a query sql to do it:
INSERT INTO fookoo_business
SELECT stat_date, SUM(spend), SUM(revenue)
FROM hooloo_business
WHERE stat_date BETWEEN STR_TO_DATE('2017-01-02', '%Y-%m-%d') -- start date
AND DATE_SUB(NOW(), INTERVAL 1 DAY) -- end date
GROUP BY stat_date;
I am developing a Java application using MySQL. I need to know which is the week of each month, of the stored dates. Is there any MySQL function for that ? Basically , if i was to use this for the current date (13.09) it would show me its in week number 2 and tomorrow it will be week number 3.
You can play with the WEEK() function, and see if it suits your needs. Here I'm using WEEK(date, 3) that will return the week of the year from 1 to 53, starting from Mondays:
set #my_date = '2015-09-13';
SELECT
WEEK(#my_date, 3) -
WEEK(#my_date - INTERVAL DAY(#my_date)-1 DAY, 3) + 1
AS week_number;
WEEK(date, 3) will return the week of the year of the selected date
WEEK(date - INTERVAL DAY(#my_date)-1 DAY, 3) will return the week of the year of the first day of the month of the selected date
It will return 1 for 01-March-2015 (because it's the first day of the month so it's week 1) and 2 for 02-March-2015 (because weeks starts from Mondays, so it's a new week). If this is not the desidered behaviour you should specify your requirements more precisely.
Please see a fiddle here.
Unfortunately, there isn't a "weekofmonth" function, but you could use dayofmonth, and manipulate the result a bit:
SELECT CURRENT_DATE(),
FLOOR((DAYOFMONTH(CURRENT_DATE()) - 1) / 7) + 1 AS week_of_month
Create a mysql function.
CREATE FUNCTION `WEEK_OF_MONTH`(
datee DATE
) RETURNS INT(11)
BEGIN
DECLARE DayNamee VARCHAR(20);
DECLARE StartDatee DATE;
DECLARE DayNumber INT DEFAULT 0;
SET DayNamee = (SELECT DAYNAME(datee));
SET StartDatee = (SELECT FIRST_DAY(datee));
WHILE StartDatee <= datee DO
IF DayNamee = DAYNAME(StartDatee) THEN
SET DayNumber = DayNumber + 1;
END IF;
SET StartDatee = DATE_ADD( StartDatee, INTERVAL 1 DAY);
END WHILE;
RETURN DayNumber;
END$$
DELIMITER ;
Call as --
SELECT `WEEK_OF_MONTH`('2018-12-31');
Result : 5
This is what I would like to be able to do:
SET #interval_type := MONTH;
SELECT '2012-01-01' + INTERVAL 6 #interval_type;
+------------+
|'2012-06-01'|
+------------+
And of course that doesn't work and there is no "interval" data type in MySQL.
I want to be able to store an interval value and an interval type in a table so that i can have the database quickly do the math naturally without having to write a big switch statement, ala
... ELSE IF (type = 'MONTH') { SELECT #date + INTERVAL #value MONTH; } ...
Is this supported in any way in MySQL or do you have a clever hack for this?
Thanks; you rock.
This solution may come handy to somebody implementing the job queue for cron or something similar.
Let us suppose we have a reference date (DATETIME) and interval of repetition. We would like to store both values in database and get the quick comparison whether it's already time to execute and include job into execution queue or not.
The interval could be non trivial e.g. (1 YEAR 12 DAYS 12 HOUR) and is controlled by wise user (admin) so that user is not going to use values exceeding the range of regular DATETIME data type or otherwise the conversion must be implemented first. (18 MONTH -> 1 YEAR 6 MONTH).
We can use then DATETIME data type for storing both values reference date and interval. We can define stored function using:
DELIMITER $$
CREATE DEFINER=`my_db`#`%` FUNCTION `add_interval`(`source` DATETIME, `interval` DATETIME) RETURNS datetime
BEGIN
DECLARE result DATETIME;
SET result = `source`;
SET result=DATE_ADD(result, INTERVAL EXTRACT(YEAR FROM `interval`) YEAR);
SET result=DATE_ADD(result, INTERVAL EXTRACT(MONTH FROM `interval`) MONTH);
SET result=DATE_ADD(result, INTERVAL EXTRACT(DAY FROM `interval`) DAY);
SET result=DATE_ADD(result, INTERVAL EXTRACT(HOUR FROM `interval`) HOUR);
SET result=DATE_ADD(result, INTERVAL EXTRACT(MINUTE FROM `interval`) MINUTE);
SET result=DATE_ADD(result, INTERVAL EXTRACT(SECOND FROM `interval`) SECOND);
RETURN result;
END
We can then make DATETIME arithmetic using this function e.g.
// test solution
SELECT add_interval('2014-07-24 15:58:00','0001-06-00 00:00:00');
// get job from schedule table
SELECT job FROM schedule WHERE add_interval(last_execution,repetition)<NOW();
// update date of executed job
UPDATE schedule SET last_execution=add_interval(last_execution,repetition);
You can solve this problem using prepared statements, considering there is no language construct available for use. The benefit here being you get the performance and flexibility that you want; this could easily be placed in a stored procedure or function for added value:
SET #date = '2012-01-01';
SET #value = 6;
SET #type = 'MONTH';
SET #q = 'SELECT ? + INTERVAL ? ';
SET #q = CONCAT(#s, #type);
PREPARE st FROM #q;
EXECUTE st USING #date, #value;
Alternatively, depending on your database / software architecture and the type of date/time intervals you are thinking of, you could simply this problem by using a time-scale interval:
SELECT #date + INTERVAL #value SECOND
1 second - 1
1 minute - 60
1 hour - 3600
1 day - 86400 (24 hours)
1 week - 604800 (7 days)
1 month - 2419200 (4 weeks)
Here's the simplistic approach. It works reasonably fast. You can change the order of the switch statements to optimize for speed if you feel that you will be hitting some more often then others. I have not benched this against Chris Hutchinson's solution. I ran into problems trying to wrap it into a nice function because of the dynamic SQL. Anyway, for posterity, this is guaranteed to work:
CREATE FUNCTION AddInterval( date DATETIME, interval_value INT, interval_type TEXT )
RETURNS DATETIME
DETERMINISTIC
BEGIN
DECLARE newdate DATETIME;
SET newdate = date;
IF interval_type = 'YEAR' THEN
SET newdate = date + INTERVAL interval_value YEAR;
ELSEIF interval_type = 'QUARTER' THEN
SET newdate = date + INTERVAL interval_value QUARTER;
ELSEIF interval_type = 'MONTH' THEN
SET newdate = date + INTERVAL interval_value MONTH;
ELSEIF interval_type = 'WEEK' THEN
SET newdate = date + INTERVAL interval_value WEEK;
ELSEIF interval_type = 'DAY' THEN
SET newdate = date + INTERVAL interval_value DAY;
ELSEIF interval_type = 'MINUTE' THEN
SET newdate = date + INTERVAL interval_value MINUTE;
ELSEIF interval_type = 'SECOND' THEN
SET newdate = date + INTERVAL interval_value SECOND;
END IF;
RETURN newdate;
END //
It comes with this equally simplistic benchmark test:
CREATE FUNCTION `TestInterval`( numloops INT )
RETURNS INT
DETERMINISTIC
BEGIN
DECLARE date DATETIME;
DECLARE newdate DATETIME;
DECLARE i INT;
SET i = 0;
label1: LOOP
SET date = FROM_UNIXTIME(RAND() * 2147483647);
SET newdate = AddInterval(date,1,'YEAR');
SET i = i+1;
IF i < numloops THEN
ITERATE label1;
ELSE
LEAVE label1;
END IF;
END LOOP label1;
return i;
END //
I have a field of time Timestamp in my MySQL database which is mapped to a DATE datatype in my bean. Now I want a query by which I can fetch all records in the database for which the difference between the current timestamp and the one stored in the database is > 20 minutes.
How can I do it?
What i want is:
SELECT * FROM MyTab T WHERE T.runTime - now > 20 minutes
Are there any MySQL functions for this, or any way to do this in SQL?
If you have MySql version above 5.6 you could use TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) something like
select * from MyTab T where
TIMESTAMPDIFF(MINUTE,T.runTime,NOW()) > 20
MySql version >=5.6
I am using below code for today and database date.
TIMESTAMPDIFF(MINUTE,T.runTime,NOW()) > 20
According to the documentation, the first argument can be any of the following:
MICROSECOND
SECOND
MINUTE
HOUR
DAY
WEEK
MONTH
QUARTER
YEAR
ROUND(time_to_sec((TIMEDIFF(NOW(), "2015-06-10 20:15:00"))) / 60);
Try this one:
select * from MyTab T where date_add(T.runTime, INTERVAL 20 MINUTE) < NOW()
NOTE: this should work if you're using MySQL DateTime format. If you're using Unix Timestamp (integer), then it would be even easier:
select * from MyTab T where UNIX_TIMESTAMP() - T.runTime > 20*60
UNIX_TIMESTAMP() function returns you current unix timestamp.
You can try this:
SELECT * FROM MyTab T WHERE CURRENT_TIMESTAMP() > T.runTime + INTERVAL 20 MINUTE;
The CURRENT_TIMESTAMP() is a function and returns the current date and time. This function works From MySQL 4.0
If you have MySql version prior than 5.6 you don't have TIMESTAMPDIFF. So,I wrote my own MySql function to do this. Accets %i or %m for minutes and %h for hours. You can extend it.
Example of usage:
SELECT MYTSDIFF('2001-01-01 10:44:32', '2001-01-01 09:50:00', '%h')
Here goes the function. Enjoy:
DROP FUNCTION IF EXISTS MYTSDIFF;
DELIMITER $$
CREATE FUNCTION `MYTSDIFF`( date1 timestamp, date2 timestamp, fmt varchar(20))
returns varchar(20) DETERMINISTIC
BEGIN
declare secs smallint(2);
declare mins smallint(2);
declare hours int;
declare total real default 0;
declare str_total varchar(20);
if date1 > DATE_ADD( date2, interval 30 day) then
return '999999.999'; /* OUT OF RANGE TIMEDIFF */
end if;
select cast( time_format( timediff(date1, date2), '%s') as signed) into secs;
select cast( time_format( timediff(date1, date2), '%i') as signed) into mins;
select cast( time_format( timediff(date1, date2), '%H') as signed) into hours;
set total = hours * 3600 + mins * 60 + secs;
set fmt = LOWER( fmt);
if fmt = '%m' or fmt = '%i' then
set total = total / 60;
elseif fmt = '%h' then
set total = total / 3600;
else
/* Do nothing, %s is the default: */
set total = total + 0;
end if;
select cast( total as char(20)) into str_total;
return str_total;
END$$
DELIMITER ;