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If I were designing a new system, should I have each function open and close the mysql connection as and when needed OR should I form one connection and keep that as a “globally accessible variable” for that browser session?
Why is it a bad idea, if indeed it is?
Assumning we’re speaking about a web application here:
It’s usually better to have a single connection for processing entire request (not session). Less overhead, less connections used from connection pool (so more clients can connect simlutaneously), easier to work with transactions etc. Only drawback I can see, is it can be a bit more difficult to code for that.