Connections and statements

Question

OK, I'm finally arriving to my solution.
Now I have some conceptual doubts.
I am instantiating a Connection object using
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(CONNECTIONSTRING, USERNAME, PASSWORD);I'm using this Connection object to instantiate some other objects (passing it as an argument to the constructor). Then, each one of this new object will create a Statement object (con.createStatement()) to execute periodic queries. Each object executes different queries to the database.
My doubts are:
1 - Does this way of accessing to the database (sharing a single Connection object) present some difference with respect to creating a new connection for each Statement ?
2 - If close the Connection con (con.close()), will all the Statement objects die ?
Thanks!!

Answer 1

1. Sharing a Connection object to create different
statements is desirable as it saves resources in terms
of number simulataneous connections to the database.
This reduces the stress on the DBMS. I also would
recommend looking into a connection pooling.Excellent, this is what I espected. By the way, I don't know what a connection pooling is. Could you please explain the concept ?
One more thing. All the objects sharing the connection will query the database periodically (every few seconds) as long as they are alive, and they will do this asynchronously. I mean, one object doesn't know when the other objects will query the database. Furthermore, not all of them have the same query period.
How will this fact affect the DBMS ?
Thanks