title: When to open the connection using node-mysql module?
body: <p>I found a very good module (node-mysql) to connect to Mysql database.</p>
  
  <p>The module is very good, I Only have a question about "WHEN" to open the connection to Mysql.</p>
  
  <p>I always have used php-mysql before starting with node, for each request i opened a connection...then query....then close.</p>
  
  <p>Is the same with node? for each request do I have to open a connection and then close it? or can i use persistent connection?</p>
  
  <p>Thank you</p>