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emflush(); outprintln("Order shipping date is: " + order1getShipping_date() + "<br/>"); emrefresh(order1); outprintln("Order instance has been refreshed from database!" + "<br/>"); outprintln("Order shipping date is: " + order1getShipping_date() + "<br/>"); userTransactionrollback(); outprintln("Transaction has been rolled back!"); } catch (Exception e){ eprintStackTrace(); } } } As you can see, the code in the listing is fairly straightforward First, you inject an EntityManagerFactory instance into the servlet with the @PersistenceUnit annotation, and you inject the UserTransaction resource with the @Resource Next, you set up two ShoppingCart instances, setting their cart_id fields to 2 This means that these instances are associated with the customer whose cust_id is also 2 Then, you set an Order instance, associating it with appropriate Customer and Employee instances.

Here s the final version with the changes implemented: var ElementReady= new function(){ var polled = []; /* store polled elements */ var timer = null; /* store timer */ var timerStarted = false;.

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Note If you are familiar with HTML, you may be thinking that this is all well and good, but couldn t you do the same thing with some really basic HTML using many fewer lines of code Yes, of course you could, but remember this is a very simple example. In the real world, you might have cars stored in a database and use a programming language like PHP, Python, Ruby, and so on, to retrieve these records. You could then leverage these languages to output the data into JSON, which can be returned to JavaScript as the response to an asynchronous HTTP request. JavaScript can easily read the JSON response and update the web page without needing to refresh the page. Figure 6-4 illustrates where JSON data fits in the flow of a typical asynchronous web application.

Finally, you start the transaction within which you first persist the two ShoppingCart instances and call the EntityManager s flush method, and then you persist the Order instance, also calling flush after that It is important to note here that by calling the flush method you force synchronization of the entities data to the underlying database, which does not, however, commit the changes made performing a rollback is still possible The EntityManager s refresh method applied to the Order instance resets this instance from the database after you have persisted it and called flush to synchronize it to the database As you may notice in the code, order1getShipping_date() is invoked before you refresh the instance from the database, and then you invoke it right after that.

var ceasePoll = function() { clearTimeout(timer); timerStarted = false; }; var startPoll = function() { if(!timerStarted) { timer = setTimeout( function(){ElementReady.check(false)}, 100); } }; return { check:function(clean) { for(var i=0;i<polled.length;i++) { if(document.getElementById(polled[i]['element'])) { polled[i]['callback'](); polled.splice(i--,1); }else if(clean){ polled.splice(i--,1); } } if(polled.length == 0) ceasePoll(); }, cleanUp:function() { check(true); ceasePoll(); }, chkDomId:function(elId,callback) { var el = document.getElementById(elId); if (el) { callback(); }else{ polled[polled.length] = {'element':elId, 'callback':callback}; startPoll(); } } } };

The trick is that you didn t set the shipping_date field of the instance explicitly it is set by the shippingDate stored function automatically invoked from within the neworder BEFORE INSERT trigger, as discussed in 6 So, the first call of order1getShipping_date() should receive null, but the second one receives the date generated inside the database for the shipping_date field The following steps sum up what the servlet discussed here does, from the point of view of testing the entities: 1 Sets up ShoppingCart and Order instances, obtaining the corresponding Customer and Employee instances 2 Begins a transaction within which the operations upon the entities instances are performed 3 Persists the ShoppingCart and Order instances, synchronizing them to the database.

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