How can I make my Java constructor class connect with my dB and mysql ( glass fish server ) . There is a necessity to place these connection commands inside the constructor of a class .If possible ,how ?

Answer 1

It is bad practices to set up DB connections within the constructor. I suggest you look at using a singleton pattern on google for this. Other than that you set up a connection using JDBC or JPA which one are you trying to achieve both are implemented differently. I suggest looking up persistence in java to mysql server. I will post and example of what you are trying to do.

Answer 2

Here is a good example for you to look at http://www.javatpoint.com/singleton-design-pattern-in-java follow the link and look through there code.

Answer 3

thanks dude @Catlin