Question

I want to create a library(Jar file) in Java which would contain all my methods for the database we use. There are about 60 methods in there so I would like to make it more organized. I would like to call the methods like the example provided below.

db.accounts.add(username, password); or db.accounts().add(username, password);
db.names.delete(name); or db.names().delete(name);

What is the best way of doing this in Java?

Answer 1

You could save yourself a lot of trouble and write a generic DAO:

package persistence;

public interface GenericDao<K, V> {
    V find(K id);
    List<V> find();
    K save(V value);
    void update(V value);
    void delete(V value);
}

I’d forget about writing your own persistence classes and use a proven solution, like Spring JDBC template.

This problem has been solved many times, many ways. What do you hope to do to improve upon what exists? How will you justify the added expense of developing, testing, and maintaining this functionality?