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https://stackoverflow.com/questions/47432968/mysql-database-drops-connection-after-8-hours-how-to-prevent-it
Set the 8-hour idle timer on MySQL to 24 hours or more. Configure the JDBC driver in spring-database.xml in a manner that it will somehow "ping" the database every 4 hours to keep it alive, but we still don't know how to do it properly...
https://www.amazon.com/PHP-MySQL-Hours-Beginners-Learn/dp/1523800917
Ray Yao, author of the book “PHP & MySQL in 8 Hours” put together a great how-to book. It cuts to the chase and helps beginners learn what they need to know quickly and effectively. We are all so busy today and the last thing we want to do is read thru is a self-help manual. Yao takes this problem and makes it a solution with his book.
https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html
ADDDATE(date,INTERVAL expr unit), ADDDATE(expr,days) When invoked with the INTERVAL …
https://developer.jboss.org/thread/221139
Re: MySQL drops connections after 8 hours... gibsosmat Feb 11, 2013 7:20 AM ( in response to edschepis ) from your logs I guess you are using c3p0 connection pooled datasource. try setting your idleConnectionTestPeriod of c3p0 pool to a value less than the wait_timeout setting on db. so c3p0 keeps the pooled & uncheckedout connections 'alive ...
https://www.tutorialspoint.com/mysql/mysql-date-time-functions.htm
https://dev.mysql.com/doc/refman/8.0/en/date-and-time-types.html
See also Section 11.2.8, “2-Digit Years in Dates”.. Conversion of values from one temporal type to another occurs according to the rules in Section 11.2.7, “Conversion Between Date and Time Types”. MySQL automatically converts a date or time value to a number if the value is used in numeric context and vice versa.
https://www.w3schools.com/SQL/func_mysql_time_format.asp
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, …
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