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function save() { ... $query = "INSERT INTO moviesVersions SELECT now(), movies.* FROM movies WHERE id='$safeId' "; $result = mysql_query( $query ); if ( $result ) { $query = "UPDATE movies SET title='$safeTitle', review='$safeReview', stars='$safeStars' WHERE id='$safeId' "; $result = mysql_query( $query ); } ... } The first query uses a subselect to copy the appropriate row from the movies table into the moviesVersions table, preceded by the timestamp value of the current date and time. If that INSERT is successful, then the UPDATE is performed exactly as before. This method of versioning obviously requires you to refactor existing code to support it, and to take the mechanism into account in new code. Unlike using an SQL view to hide deleted records, there is nothing automatic about this. However, with this technique the current version of any record is the only one stored in the original table, so SELECT queries can continue to be used unmodified.

java and added the functionality to recalculate it and round it to two decimals after every shopping cart update This is the only update we made to the four eshopbeans modules Of the eshopmodel modules, we only needed to modify CategoryPeerjava and DataManagerjava In CategoryPeerjava, we changed the getAllCategories method to return a list of categories instead of an object of type javautilHashtable We then changed the getCategories methods in DataManagerjava and ShopManagerjava accordingly This allowed us to display the list of categories in LeftMenujspx with the following JSF element without having to do any type conversion: <h:dataTable value="#{shopManager.

In addition, just because the tag is named copyright, JSF will not simply assume that the XHTML is named copyright.xhtml. Instead, you must explicitly tell JSF the file name when defining the tag. Conceptually, it looks like Figure 5 5.

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categories}" var="category"> In DataManager, besides the change to the getCategories method that we ve already discussed and the removal of the getCatIDs method that was no longer needed, we only updated the algorithm used in the getConnection method to open a database connection This was necessary because we had replaced the database initialization parameters of Eshopx with a JNDI resource In Eshopx, DataManager opened a database connection by invoking the static getConnection method of the javasqlDriverManager class: conn = DriverManagergetConnection(getDbURL(), getDbUserName(), getDbPassword());.

We turn now from versioning for records to versioning for the actual files in which those records are stored. In the most efficient versioning system, the differences between each successive version are saved along with the latest version. Patching the file with these differences (that is, applying them in reverse) allows any previously saved version of the file to be recovered. We illustrate this concept in Figure 11 1. As new versions of a file are saved to disk, the version control system saves just the differences between the new version and the previous version. The differences file can be used as a patch, which can be applied to the current version to revert it to the previous one. Because only the patch is saved, the system is very efficient. Previous versions can be reconstructed on the fly when needed.

Figure 5 5. Explicitly specifying the file name when defining a custom tag Because a namespace could contain more than one tag, conceptually you could define multiple tags, as shown in Listing 5 2. Listing 5 2. Defining Multiple Tags Conceptually

The dbURL, dbUserName, and dbPassword attributes were set by ShopServlet using the servlet initialization parameters. In Eshopf, DataManager opens a database connection with this code: Context ctx = new InitialContext(); if (ctx != null){ Context envContext = (Context)ctx.lookup("java:/comp/env"); if (envContext != null) { DataSource ds = (DataSource)envContext.lookup("jdbc/mysql"); if (ds != null) { conn = ds.getConnection(); } } } In Eshopf, we also added Java modules to implement a custom JSF component, a converter, a renderer, and a validator. Please refer to the corresponding sections of 5 for their description.

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