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I'm currently writing my Main Assignment on my last semester at my study (IT-Engineering with Networking) and currently working with MySQL.
My question is: Is it possible to execute a Shell script/Command from within a MySQL Trigger/Procedure? Or can it be done from a CASE statement? I've been searching around the internet and read that it's inadvisable to do it. But I need a script to check a table in a database for alerts and then warn people if there is any. If there is anyway else this could be done, then I'm open for ideas. Any input will be appreciated :)
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MySQL allows you to call a stored procedure from a trigger by using the CALL statement. By doing this, you can reuse the same stored procedure in several triggers. However, the trigger cannot call a stored procedure that has OUT or INOUT parameters or a stored procedure that uses dynamic SQL.
sql file from PUTTY, we first connect to DB using syntax <sqlplus> and then DB credentials. Then, we will give the file execution command as <@file_name. sql> and once the file is executed, we will give <exit> to come out of db and then remaining process.
You can read this blog for triggering a shell script from MySQL: https://patternbuffer.wordpress.com/2012/09/14/triggering-shell-script-from-mysql/. To summarize, two options are presented:
I think for your requirement just write a python/php/perl script which will connect your MySQL DB and query the alert table for any alert and accordingly show warning message on the screen or send email/sms warning.
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