Can anuone help me on persistence API problem please?

Question

I would like someone to explain me why when using persistence API
sometime i can insert data in database normally but later when i
have added more functionalities like ajax, and file upload i can
insert data in database using persistence API.
for instance, using this i was able in the begin of my development
but now i am not:
utx.begin();
inst.insert(name, email); 
utx.commit();replace the code above by this below i can insert the data
at the same step of my project:
Class.forName("com.mysql.jdbc.jdbc2.optional.MysqlDataSource").newInstance();
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1/loja?user=marcos&password=131283");     
            String selectStatement = "insert into cadastroswebradio values(?, ?)";
            PreparedStatement prepStmt = con.prepareStatement(selectStatement);
            prepStmt.setString(1, name);
            prepStmt.setString(2, email);So what's the problem? could anyone help me?Thanks!!
this explain either:http://forum.java.sun.com/thread.jspa?threadID=764824

Answer 1

Basically i totally not understand your question and i believe also nobody would understand what is your question. You mean your persistence APIs, but you didnt show how the APIs and just use it, i can say that, the only different of that JDBC and your 'persistence', is your JDBC isnt commit function(not include auto-commit). What i can see is that's all.
But the idea of usage DB conn API should be correct with the 3 steps,
Begin - Open connection
Query - insert/update/delete
Close - commit
catch - Rollback
Hopefully it helps.