What is and how can one write a DAO?

I have this program i have been asked to write which basically a web application. I have worked with servlets before but i have never been asked to use a DAO. I just want to know what it is and it works.

Here, [let me google that for you|http://lmgtfy.com/?q=what+is+a+DAO%3F].

Similar Messages

Computer fails to boot up after password change. After new password keyed in, computer also asked for old password. But even when old password supplied, computer just freezes and fails to boot up. What is causing the problem and how can one solve it?

Changed password on MacBook Pro recently. But after password change. Computer ask for old password, thereafter. Even when correctly supplying the old password. Computer system does not boot up and just freezes. What is causing the problem and how can one resolve the issue?

OS X 10.7 Lion, 10.8 Mountain Lion, 10.9 Mavericks and 10.10 Yosemite
Reset Password
Start the computer,then press and hold down command and R keys to start into recovery partition.
When you see the Apple logo, release the keys.
Wait until OS X Utilities window shows up.
Move the mouse pointer to the menubar at the top and click "Utilities", then select "Terminal"
from the drop down.
Terminal window will appear.
Type in resetpassword and press enter on the keyboard.
Leave the Terminal window open.
Reset Password Utility window will open with Macintosh HD selected.
Select the user account from the popup menu box under “Select user account”.
Enter a new password.
Reenter the new password for the user.
Enter a hint.
Click the "Save" button.
Click  in the menubar and select Restart.
Log in.
If Keychain dialog box appears, select “Create New Keychain”.

My ipad inbox suddenly shows 18500 emails but there are only 20 or so shown. What happened and how can I correct? Thanks

My ipad inbox suddenly shows 18500 emails but there are only 20 or so shown. What happened and how can I correct? Thanks

Backup, backup, backup...
T-21 wrote:
Hello.
I did not touch my computer the past week, I've only been messing with my laptop. I had my computer off a whole day. I turn it on, open iTunes, and everything is gone.
Is your laptop a different computer than your computer?
You have two computers?
iTunes is missing everything from which one/both?
I system restore. Everything is gone. None of my podcasts, apps, or music files are there.
Do you mean you reinstalled the system from scratch?
Yes, that tends to delete everything.
Or you restored everything from a backup?
Directions on where to go to download all past purchases?
Selete Store on the left side of iTunes.
Make sure you are signed in.
Click on Purchased on the right side under Quick links to redownlaod your purchases.
Then make sure to regularly backup, backup, backup all your important data .

I downloaded Safari 5.1 onto Mac OS 10.6.8 some time ago. Yesterday the back/forward arrows next to the url window changed to a , which adds the current url as a bookmark. I want the arrows back. What happened, and how can I fix this? Thanks. kammro

I downloaded Safari 5.1 onto Mac OS 10.6.8 some time ago. Yesterday the back/forward arrows next to the url window changed to a +, which adds the current url as a bookmark. I want the arrows back. What happened, and how can I fix this? Thanks. kammro

There's another way.
Right or control click the + then click Remove Item.
Just remembered that keyboard shortcut!
You're welcome

I have not accessed my iBooks for a month. When I opened the application a while ago I found that all my books except for 2books have disappeared. What happened and how can I retrieve my books?

I have not accessed my iBook library for a month. When I opened the application awhile ago I found that all my books except for 2 books have disappeared. What happened and how can I retrieve my books.
Charles

One possible reason is have you synced to your computer's iTunes recently ? If so then it might have replaced the books that were on your iPad with those that are on your computer's iTunes library.
You should be able to re-download them via the Purchased tab in the ibookstore in the iBooks app, or via the Purchased link under Quick Links on the right-hand side of the iTunes store home page on your computer's iTunes and then sync them back to the iPad : re-downloading. If you re-download them directly on your iPad then you may want to copy them to your computer's iTunes via File > Transfer Purchases, so that you have a backup copy of them and to see if it stops them disappearing from the iPad again when you sync (assuming that was the reason why they disappeard).

I have Calendar v 7.0 and Entourage 12.3.6 2008 on OS X 10.9.2. I cannot import Entourage events into Calendar - this was never an issue with iCal. Whats happened and how can I import details into Calendar or do I need iCal back?

I have Calendar v 7.0 and Entourage 12.3.6 2008 on OS X 10.9.2. I cannot import Entourage events into Calendar - this was never an issue with iCal. Whats happened and how can I import details into Calendar or do I need iCal back?

adamboettiger wrote:
Sophos and MacKeeper
There are many reported problems with both these programs.
Run through this list of fixes in order, will tune you right up.
They are in order for a reason.
..Step by Step to fix your Mac

I cant find iChat anymore on my iPod touch what happened and how can I get it back?

I just got a new iPod touch and I can't find iChat. I am not sure if it is the generation (4th) but it should come automatically. I also know somebody who has a 3rd generation iPod. What happened and how can I get it?

iOS 5 comes with the Messaging app. You can text with that. It is not called iChat, it is called Messages

Last night, mail suddenly lost all my emails, which were stored in mailboxes. What happened and how can I find my lost files? I have the latest MacBookPro, running Lion 10.7.2 all software updates installed

Last night the mail application from Apple lost all my old emails, which were stored in mailboxes, neatly sorted by category. What happened and how do I find them?
Details: I shut down mail to run errands outside my office. My late model MacBook Pro was on "sleep". When I returned, I opened the application, and (RATS!) all the mailboxes were missing. They just evaporated.
Operating system: 10.7.2 - all software updates installed and current as of 24 hours ago (12-30-11, 6 AM EST).
ln the mail program, the trash folder is OK and the sent folder is OK.
Yesterday, I did no maintenance on my mail folders.
HELP!

1 - the sudden disappearance of my 22 mailboxes, used to sort the emails that I need to file for future use
That was most likely the result of some kind of corruption, as I've already said, not a bug in Mail. Have you repaired the hard drive with Disk Utility recently? That wouldn't be a bad idea.
2 - at random times, mail (or the server) says that my password is incorrect and I must reenter (fix: usually I can quit mail, restart, and the connection is restored without reentering my password)
This is a known issue, where a failure to respond promptly on the server's end mimics what happens when the password is rejected. There's no need to quit Mail, just cancel when asked to enter the password, take the account back online and try again.
3 - mail seems to resort the mail in my mailboxes at random time. Several times a day, I must reset the sort to (a) by date; (b) by desending
Never seen that before. That points more to some kind of possible corruption in your Mail data or preference files.

IPhoto "Unexpectedly Quit". When I went back in, about the past month's worth of uploaded photos was missing. What happened, and how can I retrieve them?

IPhoto was open, but "unexpectedly quit". When I opened it again a couple days later, my most recent photo uploads (for the past month or so) were missing, with dated Events folders saying "no photos". This had happened another time about a year ago? What happened, and how do I retrieve my photos? I hadn't backed them up, but do they automatically do so on iCloud?

Assuming you're running iPhoto 9 or later do the following:
1 - launch iPhoto with the Command+Option keys held down to open the First Aid window. Be sure to follow the circled recommendation in the screenshot.
2 - run Option #4, Rebuild Database.

HT1766 help i was following the steps for backing up my iphone and all of a sudden my iphone is dead and showing only a cord to connect to computer and the word itunes...what happened and how can I restore it?

help i was following steps for backing up my iphone and all of a sudden it went blck and then and now just shows a computer plug in with the words istunes....what happened and how do i restore my phone?

As explained here
http://support.apple.com/kb/HT1808?viewlocale=en_US

Last night all the spreadsheets disappeared from "Numbers" and likewise all the documents from "Pages." What happened and how can I get them back?

All my spreadsheets and documents disappeared from my iPad. Where did they go and how can I get them back?.

I have the same problem for spreadsheets (via Numbers app). My spreadsheets were present and working as of last week. And these past few days all of them just disappeared!
Any help or thoughts would be very much appreciated. Thank you.
I'm on an iPad Air.

After iMac is asleep, it requires going though the network diagnostics screens to reconnect to the internet. What happened and how can I fix that?

After the iMac has been asleep, it requires me to go through the Network Diagnostics screens to reconnect to the internet. Why and how can I fix that?

Which model iMac do you have? Which OS system are you using? Need this information to provide you with the correct troubleshooting solution(s).
Please detail all you have done to resolve your issue. Need this information so that the users can avoid the "been there, done that" scenario type responses. This is to avoid repeating the troubleshooting you may have already tried. Thank you.
If you have an Intel iMac, please post over in their forum area.

I am getting a black/yellow sign with NETBLOCKADE on it when I try to open youtube, and of the Facebook games.......what happened and how can I correct this?

I do not know what else to write except my question. The page will open up but where the scene I am suppose to watch on YouTube or the area where the game is suppose to be played....this warning sign in black and yellow strips with netblockade written across it appears and I can not go forward since it is blocked!!!! I do not know what happened. What can I do to remove this block? Thanks

Go to image>mode and note the color mode (rgb, bitmap, etc) and bit depth of your photo. For the most possible use of PSE it should be RGB 8 bit.

Is my iPhone is having multiple problems, whats wrong and how can I fix it

My iPhone 3G ¡OS 5.1.1 is always searchIng or saying no service where the signal bars are and when I try going on the Internet, send txt, email and more it say turn on your cellular data when it is on. And every now and then my phone will **** off and either cut back on, or pop up say activation required. what wrong with the phone why does it keep doing all of this and how to fix it

If you are using the iphone as designed ,then all of this is on your computer.
You should be importing all pics taken with the iphone to your computer regularly. All apps purchaqsed on the iphone should be transferred to your computer. Contacts/calendars should be synced to your computer.
Restart loses nothing.
Reset loses nothing.
Restore from backup will put everything back if you have stored it all on your computer.
Restore as new will erase everything. If you have everything stored on your computer as you should, then you can put everything back

HT5622 My apple account stated that it is not valid in the U.S. store and instructed me to switch to Philippine store before I can download. What gives and how can I switch to Philippine store?

HI. I was trying to download some apps but there was this notification which stated that my account is not valid in U.S. store and instructed me to switch to Philippine Store. I did not register in the U.S. store ever so how can I switch to Philippine store? There was no further instructions on my iphone on how to deal with my concern. Please help. Thanks.

CHANGING APPLE ID/EDIT ACCOUNT INFORMATION/CHANGE ITUNES COUNTRY
Tap Settings / iTunes & App Stores, then tap the Apple ID signed in. Sign out of the current Apple ID account and then sign in with another account or create a new Apple ID http://support.apple.com/kb/HT2731?viewlocale=en_US
To edit account information tap Settings / iTunes & App Stores / Apple ID: / View Apple ID
To change your iTunes Store country, sign in to the account for the iTunes Store region you would like to use, tap Settings/iTunes & App Store/Apple ID/View Apple ID/Country/Region
Read this article for information http://support.apple.com/kb/HT1311

What is and how can one write a DAO?

Similar Messages

Maybe you are looking for