I would like to change the interval in this SQL statement, based on a parameter in a stored procedure. I want to use three different intervals: 1 day, 8 hours, 1 hour
CREATE DEFINER= 'dbshizzle' PROCEDURE `getData`(in sD text(17), in sT text(8))
BEGIN
select stime, sval
from tblNumber
where sDix = 'allright'
and timestamp >= now() - interval 1 day
order by timestamp;
END
Should I use an IF statement with an integer parameter, or a text parameter?
How about just adjusting the parameter and passing in the value as hours?
CREATE DEFINER = 'dbshizzle' PROCEDURE `getData`(
in in_sD text(17), -- should change to varchar
in in_sT text(8), -- should change to varchar
in in_hours int
)
BEGIN
select stime, sval
from tblNumber
where sDix = 'allright'
and timestamp >= now() - interval in_hours hour
order by timestamp;
END;
Related
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 want to assign value of a query to a datetime variable in MySql Stored Procedure.
I'm trying this -
DECLARE myDate DATETIME;
SET myDate = (SELECT date1 FROM myTable WHERE Id = var_myId);
And this
DECLARE myDate DATETIME;
SELECT date1 into myDate FROM myTable WHERE Id = var_myId;
Both don't seem to work as I am not getting the desired result after running the proc.
EDIT
Problem is in this statement -
initial_Date DATETIME; -- param1
interval INTEGER; -- param2
SET var_date2 = DATE_ADD(initial_Date , INTERVAL interval MINUTE);
When I select var_date2 I get null as result.
I find two issue with your stored procedure.
First, you are naming a variable using an sql key word interval. You should rename with an word which is not an sql key word.
The other is you are not setting an out put variable. You can see the MySQL tutorials on stored procedure.
You can use and try the code below:
delimiter //
create procedure test(in initial_time datetime, in minuteInterval integer(2),
out final_time datetime)
begin
set final_time = date_add(initial_time, interval minuteInterval minute);
end//
delimiter ;
For testing you can try:
call test(now(), 60, #final_time);
select #final_time;
Here is the screenshot of my test with mysql 5.5.21:
I'm currently using DATE_ADD(date,INTERVAL expr type) to set a due date as a trigger in a mySQL Database.
What I'm wanting to know is if it is possible to skip weekends (Saturday, Sunday) as part of the trigger.
You'd have to create an own function for doing that. You can look how to do that in this answer, for example (just use function instead of procedure). As for how to write such a function, here's a working algorithm. The code is quite straightforward: it loops through days and skips weekends.
CREATE FUNCTION `DAYSADDNOWK`(addDate DATE, numDays INT) RETURNS date
BEGIN
IF (WEEKDAY(addDate)=5) THEN
SET addDate=DATE_ADD(addDate, INTERVAL 1 DAY);
END IF;
IF (WEEKDAY(addDate)=6) THEN
SET addDate=DATE_ADD(addDate, INTERVAL 1 DAY);
END IF;
WHILE numDays>0 DO
SET addDate=DATE_ADD(addDate, INTERVAL 1 DAY);
IF (WEEKDAY(addDate)=5) THEN
SET addDate=DATE_ADD(addDate, INTERVAL 1 DAY);
END IF;
IF (WEEKDAY(addDate)=6) THEN
SET addDate=DATE_ADD(addDate, INTERVAL 1 DAY);
END IF;
SET numDays=numDays-1;
END WHILE;
RETURN addDate;
END
Currently SELECT DAYSADDNOWK(CURDATE(), 5) yields 2016-03-07, which is correct.
Of course you only can use it with days, so no arbitrary interval, but your question mentioned date datatype, and I don't quite see how one could add a month not counting working days.
This function simply creates a list of dates starting at the date given in the arguments, and then figures out which date is x number of days (the interval) out while disregarding days 1 and 7 (which are Sunday and Saturday respectively on SQL Server).
CREATE FUNCTION [dbo].[udf_days_add_no_wknd]
(
#start_date date
, #interval int
)
RETURNS date
AS
BEGIN
declare #answer date
; with dates as
(
select #start_date as date_val
union all
select dateadd(d, 1, date_val) as date_val
from dates
where date_val < dateadd(d, #interval * 10, #start_date)
)
, final as
(
select top 1 lead(ld.date_val, #interval, NULL) over (order by ld.date_val asc) as new_date_val
from dates as ld
where 1=1
and datepart(dw, ld.date_val) not in (1,7) --eliminating weekends
)
select #answer = (select new_date_val from final)
return #answer
END
It is worth nothing that this solution is dependent on having SQL Server 2012 or later, considering the use of the lead() function.
I have 2 stored Procedures in MySQL. I want to call one from the other but I need some help with the syntax
Here is Procedure 1 FindPreviousDate
DELIMITER $$ CREATE PROCEDURE `FindPreviousDate`(IN eventdate DATETIME, IN lookbackDays INT, IN symbol VARCHAR(20))
BEGIN
SELECT *
FROM Price a
WHERE a.eventDate between (eventDate - interval lookbackDays day) and (eventdate - interval 1 day) and a.symbol = symbol
ORDER BY a.eventDate DESC
LIMIT 1;
END
Here is Procedure 2 FindCloseEvent
CREATE PROCEDURE `FindCloseEvent`(IN startdate DATETIME, IN enddate DATETIME,IN symbol VARCHAR(20), IN cutoff DOUBLE)
BEGIN
SELECT *
FROM Price a
WHERE a.eventDate between startdate and enddate and
(SELECT COUNT(*) from Price b where b.eventDate = a.eventDate and b.closePrice < cutoff and a.symbol = b.symbol and
(SELECT COUNT(*) from Price c where c.eventDate = (b.eventDate - interval 1 day) and c.closePrice >= cutoff and b.symbol = c.symbol));
END
I want to replace this code in Procedure 2 with the result of Procedure 1
(b.eventDate - interval 1 day)
I need help getting the syntax right. I'm not even sure if mySql allows for what I'm asking.
Thanks!
On procedures you can use OUT variables, which get filled and are available outside the procedure.
OR
Since a MySQL procedure does not return a value. You'll need a stored function to achieve this.
use the example given into below link to call a function1 from your procedure2
http://www.java2s.com/Code/SQL/Procedure-Function/Callanotherfunction.htm
you can even store the result of function1 into some variable of procedure2 and use it later in query
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 //