The Explicit Construction Anti-Pattern (Promises)

[serzero2007]

It looks like the code for most of the methods is too complex, because of the use of the "The Explicit Construction Anti-Pattern" (http://bluebirdjs.com/docs/anti-patterns.html).

For example, instead of

return new Promise((resolve, reject) => {
   this.execute('ROLLBACK')
   .then(() => {
       self[m_transaction] = false;
       resolve(true);
    })
   .catch(error => {
       reject(error);
   })
})

one should write:

return this.execute('ROLLBACK').then(() => {
   self[m_transaction] = false;
   return true;
})

which is far simpler and easier to reason about. And performant as well.