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As an alternative for those who may not have access to a database with views, and who don t want to have to modify all the queries in an application just to avoid deletion, here is an alternative method: move deleted records to a separate table, off limits to the application, for storage. Rather than alter the original table, use its definition to create a similar but empty table for holding deleted records. The following instruction works in MySQL 4.1: CREATE TABLE deletedMovies LIKE movies; For MySQL versions that don t support CREATE TABLE LIKE, you can accomplish the same thing with an instruction like this (thanks to Christian, who proposed this solution in the MySQL manual at http://dev.mysql.com/doc/mysql/en/create-table.html): CREATE TABLE deletedMovies SELECT * FROM movies WHERE 1 = 2; Here the SELECT * establishes a table structure in the newly created table that is identical to that of the old table, but the WHERE 1 = 2 restriction (which can never be true) inserts no records.

Figure C-14. HTML elements to render menu selections size="2" defines the number of lines to be displayed. You can use the <optgroup> subelements recursively to group the items in a hierarchical fashion. The multiple attribute lets you select several individual items by pressing the Control key while clicking, or several adjacent items by pressing the Shift key instead.

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Once the shadow table has been created, you will need to edit your application s code. Wherever a DELETE instruction occurs, precede it with a statement to INSERT the same record into the storage table. So, for example, the following query: DELETE FROM movies WHERE stars = '0'; would become INSERT IGNORE INTO deletedMovies SELECT * FROM movies WHERE stars = '0'; DELETE FROM movies WHERE stars='0'; The IGNORE directive in the INSERT query tells MySQL to ignore any records with duplicate keys; it is a safeguard to prevent the INSERT from failing in case there is already a deleted movie with a similar ID. It must be noted that, although this technique can provide real protection, you could still conceivably lose data if the DELETE succeeds but the INSERT into the deleted records table fails for some reason. To prevent this, you will want to use a transaction (that is, a clustering of commands so that if either query fails, the other can be rolled back; see http://dev.mysql.com/doc/mysql/en/ansi-difftransactions.html for more information). Furthermore, somewhere in your application you must provide the capacity for an editor, a trusted user, or an administrator to actually delete records. You will need to analyze the requirements of your application to see whether you may not be better off by simply backing up your database frequently.

You learned the following in this chapter: A facet is a child component that is subjected to special processing by its parent A request has a table of attributes Each attribute has a name and a value (Object) It allows you to give a name to an object It is like request-scoped web beans except that it doesn t create the object; it only associates it with a name To loop through some items in a table, if the number of items can only be determined at runtime, use the <h:dataTable> tag, which will create a UI Data component You provide a List of items to it, and it will loop through it for each item Its children must be UI Column components Each UI Column represents a column in the table.

Figure C-15. Grouping sets of fields This is pretty self-explanatory. Note that you can use <fieldset> recursively to create sets within sets.

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