Access denied for user ' root ' @ ' localhost ' (using password:yes) or a database other than the project database unknown ' Qqzone '

This problem occurs online a lot of seniors gave a solution, but I reference, did not get resolved, finally find the teacher found the problem, because my Tomcat ran a number of projects, found in the Tomcat installation directory of the WebApps, the files are removed to try, my problem solved, or increase the number of connections in one of the following methods;

If this does not solve the method can be based on the Internet access to the solution:

1. Modify database password or data port
   
   
   
   Select the maximum number of connections according to your needs
   
   
   
   After you change the link must change the port number, re-link with the new password, remember

2. Other methods are not introduced, you find it yourself, 2333 ~_~

Access denied for user ' root ' @ ' localhost ' (using password:yes) or a database other than the project database unknown ' Qqzone '