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Specifically, I have a DB class that opens and closes multiple MySQL connections every time I call the Query function in the class. Should I open a connection once? or is it ok to open and close connections like this?
My simple-minded (ISAM, no transactions) C-language app runs for eight hours a day, updating multiple tables in one database over one single MySQL connection that stays open the whole time. It works just fine. Anytime there’s any kind of MySQL error (not only server gone away), the code just calls mysql_real_connect() again and it picks right up without any trouble. Reconnection is one of the places where, in my opinion, MySQL functions flawlessly.
But there’s plenty of controversy and discussion about the goodness/badness of persistent connections. You can find some of it here:
http://www.google.com/webhp?hl=&sourceid=navclient-ff&rlz=1B3GGLL_enUS384US384&ie=UTF-8#rlz=1B3GGLL_enUS384US384&hl=en&source=hp&q=mysql+persistent+connection&aq=0&aqi=g4g-m5&aql=&oq=mysql+persistent+conn&gs_rfai=Ch2c6iCchTO3zG4i6MZ-i7JAOAAAAqgQFT9BAKCs&fp=ff274912d96214e6
— HTH