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One nice side-effect of soft deletes like these is that you can allow privileged users of your application, such as editors in a CMS, to review deleted records and possibly undelete them. If you are using a table with a deleted flag, this is a simple matter of implementing logic that retrieves records where deleted = '1', rather than the normal deleted = '0'. If you are using a view to restrict access, be sure to select deleted records from the actual table, not from the view. If you are using a shadow table to hold deleted records, simply retrieve them from there rather than from the regular table. As a practical matter, if you want to allow users to undelete records, they will need to be able to see them in the web interface of your application. One way to make this easier is to set a global $_SESSION['showDeleted'] variable to TRUE and then to act on that preference if the user has sufficient access privileges to view deleted records. Another method is to implement a trash can view that shows only deleted items, and restrict access to that view accordingly.

For each row, the UI Data will create an environment containing the row index and store the current item into an attribute before asking each UI Column to render itself Each UI Column will render its own child components (excluding the facet named header) A UI Column can optionally have a facet named header In that case, the UI Data will render a header row and ask the UI Columns to render the header facet as the header for the column before it starts to process the data rows On form submission, the UI Data will loop through the items again, e- reating the r c environment (to set up the attribute) and giving each component inside an opportunity to apply request values, process validations, update domain values and invoke application in each respective phase.

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Use <input type="file" name="f"/> to upload a file. The browser takes care of displaying the Browse button and the field to type in file name and path. Be sure that you define the method="post" and enctype="multipart/form-data" attributes in the <form> element.

The concept of versioning is familiar enough in the filesystem, where many Version Control Systems exist to preserve consecutive copies of files. The concept is less familiar, however, when applied to database tables (even though those tables do technically reside in files). Such a system can add measurably to your ability to prevent data loss, however. It has the additional advantage of permitting a rollback to any previous version, as well as allowing users with appropriate privileges to view all versions of a given record. (Normally, only the most recently updated version of a record is the one that will be selected.) We will use a shadow table, similar to the one we proposed for deleted records in the previous section, to hold all versions of individual records. Whenever a record is updated within your application, you will use an INSERT INTO ... SELECT query prior to the update in order to capture the current version before it is changed.

Because the current item is stored into an attribute and that attribute will be cleared by the environment, if you need to pass it onto the next page, most likely you ll want to use the Set Property action listener If you need to loop through some items but they won t be presented in an HTML <table>, you can use the <ui:repeat> tag It works very much like the <h:dataTable> tag except that it won t output markup of its own To create a link, use the UI Command component with a link renderer In terms of behavior, it is just like a UI Command component with a button renderer For a UI Command, in addition to setting an outcome in its action attribute, you can also specify a method This is useful when you need to perform a business action.

We have to distinguish between definition lists, ordered list, and unordered lists. Figure C-16 shows a definition list.

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