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Spring Portlet MVC offers a SimpleFormController class that is very similar to that in Spring Web MVC. It also supports command objects and is able to bind form field values to a command object s properties of the same names. By extending SimpleFormController, your controller will inherit the ability to handle forms. When SimpleFormController is asked to show a form by a portlet render request, it will render the form view to the user. Later, when the form is submitted by a portlet action request, SimpleFormController will bind the form field values to a command object and then validate this object with its validators. If no error occurs, it will invoke the onSubmitAction() method. After the action request completes, SimpleFormController will be asked to handle a render request. If the form has been handled successfully, it will render the success view to the user. Otherwise, it will render the form view again with the errors.



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public boolean next()

If we know that the optimum will never be greater than A, and we know our approximation will never be smaller than B, we can be certain that the ratio of the two will never be greater than A/B15 For the unbounded knapsack, can you think of some upper limit to the value you can achieve Well, we can t get anything better than filling the knapsack to the brim with the item type with the highest unit value (sort of like an unbounded fractional solution) Such a solution might very well be impossible, but we certainly can t do better Let this optimistic bound be A Can we give a lower bound B for our approximation, or at least say something about the ratio A/B Consider the first item you add Let s say it uses up more than half the capacity.





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Suppose you are going to create a portlet for users to book tours through your travel portal. First of all, you define the following BookingForm domain class, whose instances will be used as form command objects. As command objects may be persisted in sessions, this class should implement the Serializable interface.

Assuming no problems with the SQL command, the executeQuery() method will always return a non-null ResultSet. When the executeQuery() method returns the ResultSet, the cursor is positioned prior to the first row of data. Cursor is a database term. It generally refers to the set of rows returned by a query.

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To get to the first row of data, you must call the next() method. Each time you need to get the following row of data, you call next() again. The next() method returns a boolean value. If there is another row of data, the cursor is positioned at that row and the method returns true; if there are no more rows of data, the cursor is positioned after the last row and the next() method returns false. If there are no results at all in the resultset, then next() will return false the first time it is called. If you use any of the other movement methods (which we will see shortly) with a nonscrollable resultset, the resultset will throw a SQLException. Now, let s take a look at the other two forms of createStatement(). These two forms have method parameters, and the first parameter sets the type. The type refers to whether you can move backwards through the resultset. The second parameter defines whether you can update the table through the resultset. We ll talk about updateable resultsets later in the chapter. For the first parameter, you can pass one of these three arguments: ResultSet.TYPE_SCROLL_SENSITIVE ResultSet.TYPE_SCROLL_INSENSITIVE ResultSet.TYPE_FORWARD_ONLY

This means we can t add any more of this type, so we re already worse off than the hypothetical A But we did fill at least half the knapsack with the best item type, so even if we stop right now, we know that A/B is at most 2 If we manage to add more items, the situation can only improve What if the first item didn t use more than half the capacity 16 Good news, everyone: we can add another item of the same kind! In fact, we can keep adding items of this kind until we ve used at least half the capacity, ensuring that the bound on the approximation ratio still holds..

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