Using SQL Transactions in a JSF page

Question

Hi,
I have got a problem implementing SQL Transactions into a JSF page.
Here is my problem:
I have go an object named "database" which contains the connection and the necessary method to launch queries, connection,...
the database object is instantiated in the constructor of the page.
I will name as "the process", this :
database.connectTo(); //the instantiation of the connection
database.connection.setAutoCommit(false);
database.executeNonQuery("any insertion query");
database.executeNonQuery("any insertion query2");
database.executeNonQuery("any insertion query3");
database.executeNonQuery("COMMIT");
(As you can see, it's just a preliminary test, the rollback is not tested yet)
If I put the entire process in a single method, everything works fine.
If I split the queries and the commit query, the commit is not launched because the connection of my object "database" is null. I mean by "splitting", the launch of the 3 insertion queries is in a method (of a button for example) and the launch of the commit query is in another method (another button).
It appears that the attribute connection is set to null after the launch of the three queries...
Moreover, nothing is inserted in the database (this logical since the commit is not launched).
Has anyone a clue?

Answer 1

Your database transaction should not span two buttons. The two buttons will be called on separate requests -- that is, separate calls to the server -- and you'll have a database connection dangling out there, potentially locking other people out of certain tables/rows until the user clicks the right button.
Note also that there is a commit() method in the JDBC API.
You might want to spend some time studying some example applications.