node_modules/sails-mysql/helpers/private/connection/release-connection.js

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//
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//
// Release an open database connection.

var MySQL = require('machinepack-mysql');

module.exports = function releaseConnection(connection, leased, cb) {
  // If this connection was leased outside of the Adapter, don't release it.
  if (leased) {
    return setImmediate(function ensureAsync() {
      return cb();
    });
  }

  MySQL.releaseConnection({
    connection: connection
  }).switch({
    error: function error(err) {
      return cb(new Error('There was an error releasing the connection back into the pool.' + err.stack));
    },
    badConnection: function badConnection() {
      return cb(new Error('Bad connection when trying to release an active connection.'));
    },
    success: function success() {
      return cb();
    }
  });
};