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In most database-driven applications, users are able to delete records from the system. These records may represent everything from the contents of a shopping cart to the articles in a CMS. Whatever they are, they are probably pretty important to you and your operation. Even something as seemingly disposable as an item in a shopping cart has importance as a record in the database: if it is deleted, how will you know that the user was considering the purchase Of course, adding the ability to recover from accidental or on-purpose deletions makes even more sense when applied to the articles in a Content Management System. Part of an editor s job is to remove articles from the system, so the ability to delete using the web interface is required. But the unexpected deletion of a featured article is pretty obviously something you want to protect against. In this section, we will explore some techniques for preventing accidental or even deliberate removal of data from your application s database.

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EL expressions can include bean properties. This means that they can invoke getter methods. What they cannot do is invoke methods that require parameters. You can work around that difficulty by setting an attribute with c:set and picking it up in a bean method.

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When a record is removed from a database using an SQL DELETE command, it is gone forever. But you can give your applications a data recovery option by adding a Boolean ENUM column to important tables rather than using DELETE statements. This column (a likely name for it is deleted) acts as a flag indicating whether the record has or has not been marked as deleted by a user. This solution has the additional administrative advantage of allowing you (or even a privileged user) to undo deletions committed accidentally. It s easiest to build this feature into an application at design time. Retrofitting an existing application that relies on DELETEs is fortunately not much harder. If you have lots of tables to deal with it may be tedious, but not difficult. For every table from which you want to permit users of the application interface to be able to delete records, add a deleted flag, like this (from the MySQL command line): ALTER TABLE sample ADD COLUMN deleted enum('1','0') DEFAULT '0'; Next, you will want to index every table where a deleted field exists, like this: ALTER TABLE sample ADD INDEX ix_deleted ( deleted ); The index is added to speed lookup in tables with a large number of deleted records. The database engine can then optimize lookups by using only the subset of records that are not marked as having been deleted. Once these changes have been made, programmatic deletion of records becomes not actual deletion, but rather a simple update of the deleted flag to 1. A PHP script fragment to accomplish this setting might look something like this: < php // ...

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