New artist has been added!<p> <a href="show_artistsjsp">Return to the artist list</a> in Java

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The example exactly follows the steps outlined previously The only noteworthy point is that the ID obtained from the select is referred to as idsrows[0]id Recall that rows is an arraylike object, suitable for using in c:forEach tags; therefore, element 0 of this object will be the first row
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In Listing 65, it is immediately obvious that 99 percent of it is manipulating the model t he database with only a single tiny line of view information announcing the completion of the task This is just plain wrong! The view layer has too much model, and using the SQL tags as in the previous section is fine for quick-and-dirty database applications However, problems would soon arise when dealing with a larger, more complex site If ten pages use some hard-coded SQL and then the structure of the database changes, it can be very difficult to find and fix all the problems Although it may seem as though a database, once designed, should never change, requirements in the real world commonly shift over the course of a project The solution, as always, is to move the model layer, where it belongs, into some Java beans Fortunately, this is a simple exercise, as beans and databases already have a great deal in common A database row has a number of named columns, just as a bean has a number of named properties A table can have many rows, just as an array can have many beans In 5, these correspondences were used in a set of hard-coded beans to
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mimic a database All that is necessary to complete the picture is to modify those beans so they connect to a real database Tools that will automatically build a class or bean that reflects a table are available A very simple tool, Table2Bean, from Canetoad Software, is included on the accompanying CD-ROM As its name implies, Table2Bean takes a SQL table definition and builds a bean This bean can then provide easy mechanisms for interfacing with the underlying table To see how this will work, consider CDBean, generated from the table in Listing 61 1 If the cdId property is set, the bean will construct a SQL command, such as
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SELECT * FROM CD WHERE cdId= the provided id,
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use the result to populate the rest of the properties 2 After loading the data, any property can be changed by using the normal set methods The bean will also provide a special property, called save If this property is set after any other properties have been changed, the changes will be saved back to the database with an UPDATE command 3 Similarly, if the save property is set before the cdId property has been set, the bean will assume that this is new data and will enter it into the database with an INSERT command 4 Finally, another special property, called beans, will return an array of beans that match the current properties If a page sets the artistId field to 1, the beans property will return an array of all the albums from artist number 1 The next chapter discusses how Java News Today will use these new beans, but the principles can be examined by seeing how they could be used to simplify the CD application Listing 66 shows the new version of the page that displays all an artist's albums Listing 66 Retrieving data through a bean
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<h2>Albums by <c:out escapeXml="false" value="${paramname}"/></h2> <ul> <c:forEach items="${cdBeanbeans}" var="cd"> <li><a href="<c:url value="show_tracksjsp"> <c:param name="cd_id" value="${cdcdId}"/> <c:param name="name" value="${cdname}"/> </c:url>"><c:out value="${cdname}"/></a> </c:forEach> </ul>
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The only difference is that the sql:query tag has been replaced by a jsp:useBean and by jsp:setProperty tags; now the iteration goes over cdBeanbeans Although this is no shorter than the database version, the conceptual difference is huge Now this page does not know whether the data is coming from a database or a serialized bean or is connecting to a Web site in order to get its information The details of the model have therefore been hidden from the view, which is as it should be The difference is even more pronounced in the bean version of the page that adds an artist, which is shown in Listing 67 Listing 67 Storing data through a bean
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