i need to understand phonegap mysql remote security

i need to understand phonegap mysql remote security

am running a phonegap app android where user can insert record into
database via a form input. question is during compilation and deployment
of the app
1.will my database username,password,tables etc from php servers folder be
compiled with the app. 2. can my phonegap app be decompile by hackers to
get my database accounts from php server
if yes, how do i 100% protect my database account from being hacked via
phonegap app downloaded by my users.
finally how do i also 99.9% protect my css,html,js files in www folder of
the phonegap app
thanks