Is there any advantage to use database helper class

Is there any advantage to use database helper class ( e.g. database.bookDB in Duke's bookstore)in servlet design? What if I setup a DB connection for every servlet?

If there is not much relation between servlets.For example one servlet working on authentication againist user name/password in database another one work on searching book by keywords?
and if we want to have servlets written by difference programmers?

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Are there any advantages of using Secure Empty Trash over regular Empty Trash?

Are there any advantages of using Secure Empty Trash over regular Empty Trash?

If you are going to run around with sensitive files on your file system, you might be better off using a whole disk encryption so that every file is encrypted, any deleted file contains encrypted contents. As long a no one can access your files using your encrytpion keys, all your data is secure.
Also secure delete is not really going to do much on a Solid State Drive, and again whole disk encryption would be a better choice.
For a moderate amount of data, secure erase does not take too much time. But if you have a ton of file and/or a few really large files to erase, secure erase can take a long time to complete as it is doing multiple pass to write and overwrite the file's storage with patterns of data that make it extremely difficult to recover the original data. That takes time.
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Hi all,
Yesterday I imported around 6000+ pictures from iPhoto and consolidated them into my Aperture library. After much re-organisation into projects, folders etc. I decided to update my backup Vault to preserve all my hard work. The Vault is located on a connected external drive with plenty of spare storage. I had previously backed up successfully to the vault when there was only a few dozen pictures in my library.
After initiating the Vault update process I then left it to get on it (and to have dinner and then watch the football...) and after several hours was dismayed to find that the process appeared to be stuck at just over 50% completion. It was obvious that no further progress was being made.
I was also concerned that there appeared to be no mechanism to cancel the process and the only course of action I could take was to apply a Force Quit against Aperture - not something that I care to do, if I can possibly avoid it.
After a rudimentary search of this community I saw that several others had experienced the same problem - although some suggested that a fix had been applied in recent versions (although I am running the latest version).
Given this, I'm reluctant to use the Vault again - particularly as there appears to be no means of cancelling a stuck job. I do however use Time Machine, so my questions are:
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2) Does using Vault give any advantages over Time Machine?
3) Is anyone else experiencing this problem with the current version of Aperture (v3.3)?
4) Is there anyway of cancelling a stuck Vault update other than the sledgehammer approach of Force Quit?
Thanks in anticipation,
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SImon,
Vault and Time Machine address different needs. Probably you will want to have both.
The advantage of Time Machine: incremental backups of previous versions, very compact storage. And you can integrate it into your regular backup of the whole system and include the regular masters as well. But the disadvantage: Time Machine decides for you, what will be deleted, if the backup drives get full. You do not have control over what will be saved and what not from the previous versions.
The advantage of vaults: You can make full backups of your library for well defined moments in time - snapshots of important states. I'd create a vault, whenever I make a major upgrade of the system at least.
Is there anyway of cancelling a stuck Vault update other than the sledgehammer approach of Force Quit?
If the graphical user interface is unresponsive, like when updating a vault, you can use the Terminal to send the "termination signal" to Aperture: Sometimes this will succeed, even if the "Quit" button does not work:
Look for the Process ID of Aperture in the Activity Monitor (launch Applications > Utilities > Activity Monitor" and click the CPU heading. This will bring Aperture close to the top of the list. Make a note of the PID number in the first column, in this case 66550.
Launch a Terminal window and enter the following command:
kill -TERM 66550 (insert Aperture's PID instead of 66550)
This will send the "Software Termination Signal - TERM to Aperture, the same as pressing the "Quit" button should do, but send it directly, and not from the GUI that is unresponsive. This way I always succeded in cancelling a vaul update without force quitting. Not all processes can be terminated this way, however. The Terminal.app is also in the Applications > Utilities folder.
Regards
Léonie

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Hi
I recently came across an example where the developer had used a data value reference for the class cluster in LabVIEW.
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Thanks
AD

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Is there any practical reason to use DB helper class?

Is there any practical reason to use database helper class ( e.g. database.bookDB in Duke's bookstore)in servlet design? What if I setup a DB connection for every servlet?

to ken_robinson
I am currently setup DataSurece in servlet init().Usually (I know WebLogic is this way), if you configure the DataSource through the app server's configuration app, it is available to all applications.
The most efficient way to look up the DataSource in a particular app is have a ServletContextListener lookup the DataSource from JNDI and set it in the Context as an Attribute. Each servlet would then, in it's init() method, get the DataSource from the ServletContext (faster than using JNDI for each Servlet. The ServletContextListener requires the container you are running in support the 2.3 spec. If it does not, simply use a startup servlet (servlet that is loaded when the app is loaded) and do the same thing.

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I just don;t wan't to a Mac and then find that many features don;t work that are on the PC (or vice versa)
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It usually boils down to personal preference.
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thank you for reading my post
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Hi,
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Is there any advantage to use database helper class

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