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Now that the version-storing table has been created, you must modify your application so that before a record is updated in the original table, there will first be created in the new table a record preserving the prior version of the record that is going to be updated So whenever a record is updated, you use an INSERT to create a record in the versions table with a changed date of now(), the current date and time Only after that has succeeded do you carry out an UPDATE on the record itself UPDATEs alone might still be used for minor revisions, however There may be no need to save each and every change to a record; only a careful analysis of your application s needs and requirements will tell you for sure whether there is.

Figure 5 3. Including the XHTML file using a custom tag However, this is not a simple text inclusion. When JSF is creating the component tree, it will use the content of copyright.xhtml to create a subtree and then graft that subtree into the page, as shown in Figure 5 4.

One major change we made was to replace the custom tags defined in Eshopx with the eshop.beans.ShopManager class. We did this to take into account the functionality of JSF. For example, to update the number of copies of a book in Eshopx, you can use the custom tag UpdateBook. Listing 8-12 shows the code to implement the tag. Listing 8-12. Eshopx UpdateBookTag.java package eshop.tags; import import import import java.util.Hashtable; javax.servlet.jsp.tagext.TagSupport; javax.servlet.http.HttpSession; eshop.beans.CartItem;

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If you do decide to allow unversioned UPDATEs, they should be permitted only for second or subsequent updates to a record by the same user session and within some short and fixed amount of time So if the same user should make an additional change to the same record within the next 20 minutes, for example, your application might assume that this is a minor revision and use a simple UPDATE (without the corresponding INSERT) to avoid creating another new row in the versions table Returning to our movies example, we now show how to modify your PHP application to implement versioning Prior to any changes, here is what a relevant fragment of the code might look like: function save() { .. $query = "UPDATE movies SET title='$safeTitle', review='$safeReview', stars='$safeStars' WHERE id='$safeId' "; $result = mysql_query( $query ); ...

copyright.xhtml The root of the subtree is a component that is like a U I Panel. U Panel-Like I C omponent ...

public class UpdateBookTag extends TagSupport { static final long serialVersionUID = 1L; private String bookID; private String quantity; public void setBookID(String bookID) { this.bookID = bookID; } public void setQuantity(String quantity) { this.quantity = quantity; } public int doEndTag() { HttpSession session = pageContext.getSession(); Hashtable shoppingCart = (Hashtable)session.getAttribute("shoppingCart"); CartItem item = (CartItem)shoppingCart.get(bookID); if (item != null) { item.setQuantity(quantity); } return EVAL_PAGE; } }

} This fragment from a save() method or function simply performs a MySQL query, using sanitized data, to update the appropriate record To carry out the versioning, you need to add an INSERT operation before the UPDATE, in order to create a new version record The revised code might look something like this:.

In Eshopf, the following JSF component takes care of updating the number of copies: <h:inputText id="quantity" value="#{itemquantity}" size="2" required="true" requiredMessage="What Nothing " converterMessage="An integer, please!" validatorMessage="At least one copy!"> <f:validateLongRange minimum="1"/> </h:inputText> As a result, when you trigger an update by pressing the corresponding button, as shown here: <h:commandButton action="#{shopManagerupdateItem}" value="Update"/> there s nothing left for the updateItem function to do, as you can see here: public String updateItem() { return null; } Another example is the RoundToCent tag, which rounds amounts in dollars to two decimal places in Eshopx This is necessary, because sometimes the result of multiplying the price of a book by the ordered quantity results in a sequence of 9s after the decimal point Here is an example of its usage taken from ShoppingCartjspx: <eshop:roundToCent var="itemPrice" value="${itemquantity * itemprice}"/> In Eshopf, we introduced the subtotal attribute to eshopbeansCartItem.

Figure 5 4. Grafting the subtree into the page In addition, in XHTML each tag must belong to a namespace, so your <copyright> tag must as well. Let s choose http://foo.com as the namespace (you could choose any unique URL that you d like, though). Then you will use the tag as shown in Listing 5 1. Listing 5 1. The <copyright> Tag in the http://foo.com Namespace

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