add Warning Full Connection Pool (event)

[shlee322]

Sometimes 'pool' is used without calling 'release', which is hard to detect.
By adding 'warningFullConnectionPool', developer can find unreleased pool with ease.

pool  = mysql.createPool({
  ....
  warningFullConnectionPool : true
});
pool.on('warningFullConnectionPool', function(e) {
  console.warn(e);
});

[dougwilson]

This will break if someone does Array.prototype.thingie = function(){}. Please loop over indicies, not properties.

[shlee322]

@dougwilson can't understand what you say. you mean to change type like for(i=0;;) ?

[dougwilson]

You need to use for (var i = 0; i < pool._allConnections.length; i++) {

[shlee322]

ok. thank you.