Best practice for opening/closing JDBC conection

I've written a program that accesses a database, and I'd like to know the best practice for opening and closing that connection. For example should I use a try{} finally {} block,
try
    //load driver
    //create conection
    //create statement object
    //sql statement to execute
    //execute statement
finally
    //close connection
}Or should I split the code into seperate methods, maybe an init() method that loads the driver and makes the connection and an execute() method that creates the statement and executes it and finally a cleanUp() method that closes the connection.
So, which would be the best way to do this?

Hallo,
your idea seems OK to me. However, there are a couple of points to consider:
1. Do you just want to execute one SQL query? Or will your program execute several? If the latter case is possible, then you do not want to close your connection between queries. Opening and closing a connection to a database takes 'a lot of time', relatively speaking. In this case, it is better to save the connection and reuse it every time that you need it.
2. Do not forget to close the statements and result sets that you create or get back from JDBC. Depending on the database (eg Oracle) that you are using, you can run out of cursors, and your application will stop.

Similar Messages

Best practice for keeping a mail session open in web application?

Hello,
We have a webmail like application where users login with their IMAP credentials, then are taken to an authenticated area of the site where they can manage different things about their email account.
Right now the application is opening and closing a mail store connection (via a new javax.mail.Session) for each page load based on the current logged in user credentials. To me this seems like it would be a bad practice to keep opening and closing a connection each page load.
Are there any best practices for this situation? It would be nice to be able to open the connection to the mail server on login, then keep that connection open until the person logs out, session expires, etc.
I can probably put the javax.mail.Session into the HTTP session, but that seems like it would break any clustering functionality of tomcat. This would be fine if the machine the user is on didn't fail, but id assume if they failed over to another the mail session would be gone. Maybe keeping the mail session in the http session, checking for a connection, then first attempting to reconnect with the logged in credentials before giving up would be a possiblity?
Any pointers would be appreciated

If you keep the connection open across pages, you're going to need to deal with
timeouts - from the http session and from the mail server.
If you don't keep the connection open, you're going to need to "resynchronize"
your view of the store/folder with each operation, in case the folder is modified
by another session.
The former is easier in the common cases, especially if you don't care how gracefully
you handle failures. The latter is more difficult in the common cases, but handles
failure better, and in particular handles clustering better. You'll need to measure it to
see if it meets your performance and scalability requirements. You may need to mix
the two approaches to get acceptable performance.

Best practices for setting up users on a small office network?

Hello,
I am setting up a small office and am wondering what the best practices/steps are to setup/manage the admin, user logins and sharing privileges for the below setup:
Users: 5 users on new iMacs (x3) and upgraded G4s (x2)
Video Editing Suite: Want to connect a new iMac and a Mac Pro, on an open login (multiple users)
All machines are to be able to connect to the network, peripherals and external hard drive. Also, I would like to setup drop boxes as well to easily share files between the computers (I was thinking of using the external harddrive for this).
Thank you,

Hi,
Thanks for your posting.
When you install AD DS in the hub or staging site, disconnect the installed domain controller, and then ship the computer to the remote site, you are disconnecting a viable domain controller from the replication topology.
For more and detail information, please refer to:
Best Practices for Adding Domain Controllers in Remote Sites
http://technet.microsoft.com/en-us/library/cc794962(v=ws.10).aspx
Regards.
Vivian Wang

Best Practices for Using Photoshop (and Computing in General)

I've been seeing some threads that lead me to realize that not everyone knows the best practices for doing Photoshop on a computer, and in doing conscientious computing in general. I thought it might be a good idea for those of us with some exprience to contribute and discuss best practices for making the Photoshop and computing experience more reliable and enjoyable.
It'd be great if everyone would contribute their ideas, and especially their personal experience.
Here are some of my thoughts on data integrity (this shouldn't be the only subject of this thread):
Consider paying more for good hardware. Computers have almost become commodities, and price shopping abounds, but there are some areas where spending a few dollars more can be beneficial. For example, the difference in price between a top-of-the-line high performance enterprise class hard drive and the cheapest model around with, say, a 1 TB capacity is less than a hundred bucks! Disk drives do fail! They're not all created equal. What would it cost you in aggravation and time to lose your data? Imagine it happening at the worst possible time, because that's exactly when failures occur.
Use an Uninterruptable Power Supply (UPS). Unexpected power outages are TERRIBLE for both computer software and hardware. Lost files and burned out hardware are a possibility. A UPS that will power the computer and monitor can be found at the local high tech store and doesn't cost much. The modern ones will even communicate with the computer via USB to perform an orderly shutdown if the power failure goes on too long for the batteries to keep going. Again, how much is it worth to you to have a computer outage and loss of data?
Work locally, copy files elsewhere. Photoshop likes to be run on files on the local hard drive(s). If you are working in an environment where you have networking, rather than opening a file right off the network, then saving it back there, consider copying the file to your local hard drive then working on it there. This way an unexpected network outage or error won't cause you to lose work.
Never save over your original files. You may have a library of original images you have captured with your camera or created. Sometimes these are in formats that can be re-saved. If you're going to work on one of those files (e.g., to prepare it for some use, such as printing), and it's a file type that can be overwritten (e.g., JPEG), as soon as you open the file save the document in another location, e.g., in Photoshop .psd format.
Save your master files in several places. While you are working in Photoshop, especially if you've done a lot of work on one document, remember to save your work regularly, and you may want to save it in several different places (or copy the file after you have saved it to a backup folder, or save it in a version management system). Things can go wrong and it's nice to be able to go back to a prior saved version without losing too much work.
Make Backups. Back up your computer files, including your Photoshop work, ideally to external media. Windows now ships with a quite good backup system, and external USB drives with surprisingly high capacity (e.g., Western Digital MyBook) are very inexpensive. The external drives aren't that fast, but a backup you've set up to run late at night can finish by morning, and if/when you have a failure or loss of data. And if you're really concerned with backup integrity, you can unplug an external drive and take it to another location.
This stuff is kind of "motherhood and apple pie" but it's worth getting the word out I think.
Your ideas?
-Noel

APC Back-UPS XS 1300. $169.99 at Best Buy.
Our power outages here are usually only a few seconds; this should give my server about 20 or 25 minutes run-time.
I'm setting up the PowerChute software now to shut down the computer when 5 minutes of power is left. The load with the monitor sleeping is 171 watts.
This has surge protection and other nice features as well.
-Noel

Best practices for setting up projects

We recently adopted using Captivate for our WBT modules.
As a former Flash and Director user, I can say it’s
fast and does some great things. Doesn’t play so nice with
others on different occasions, but I’m learning. This forum
has been a great source for search and read on specific topics.
I’m trying to understand best practices for using this
product. We’ve had some problems with file size and
incorporating audio and video into our projects. Fortunately, the
forum has helped a lot with that. What I haven’t found a lot
of information on is good or better ways to set up individual
files, use multiple files and publish projects. We’ve decided
to go the route of putting standalones on our Intranet. My gut says
yuck, but for our situation I have yet to find a better way.
My question for discussion, then is: what are some best
practices for setting up individual files, using multiple files and
publishing projects? Any references or input on this would be
appreciated.

Hi,
Here are some of my suggestions:
1) Set up a style guide for all your standard slides. Eg.
Title slide, Index slide, chapter slide, end slide, screen capture,
non-screen capture, quizzes etc. This makes life a lot easier.
2) Create your own buttons and captions. The standard ones
are pretty ordinary, and it's hard to get a slick looking style
happening with the standard captions. They are pretty easy to
create (search for add print button to learn how to create
buttons). There should instructions on how to customise captions
somewhere on this forum. Customising means that you can also use
words, symbols, colours unique to your organisation.
3) Google elearning providers. Most use captivate and will
allow you to open samples or temporarily view selected modules.
This will give you great insight on what not to do and some good
ideas on what works well.
4) Timings: Using the above research, I got others to
complete the sample modules to get a feel for timings. The results
were clear, 10 mins good, 15 mins okay, 20 mins kind of okay, 30
mins bad, bad, bad. It's truly better to have a learner complete
2-3 short modules in 30 mins than one big monster. The other
benefit is that shorter files equal smaller size.
5) Narration: It's best to narrate each slide individually
(particularly for screen capture slides). You are more likely to
get it right on the first take, it's easier to edit and you don't
have to re-record the whole thing if you need to update it in
future. To get a slicker effect, use at least two voices: one male,
one female and use slightly different accents.
6) Screen capture slides: If you are recording filling out
long window based databse pages where the compulsory fields are
marked (eg. with a red asterisk) - you don't need to show how to
fill out every field. It's much easier for the learner (and you) to
show how to fill out the first few fields, then fade the screen
capture out, fade the end of the form in with the instructions on
what to do next. This will reduce your file size. In one of my
forms, this meant the removal of about 18 slides!
7) Auto captions: they are verbose (eg. 'Click on Print
Button' instead of 'Click Print'; 'Select the Print Preview item'
instead of 'Select Print Preview'). You have to edit them.
8) PC training syntax: Buttons and hyperlinks should normally
be 'click'; selections from drop down boxes or file lists are
normally 'select': Captivate sometimes mixes them up. Instructions
should always be written in the correct order: eg. Good: Click
'File', Select 'Print Preview'; Bad: Select 'Print Preview' from
the 'File Menu'. Button names, hyperlinks, selections are normally
written in bold
9) Instruction syntax: should always be written in an active
voice: eg. 'Click Options to open the printer menu' instead of
'When the Options button is clicked on, the printer menu will open'
10) Break all modules into chapters. Frame each chapter with
a chapter slide. It's also a good idea to show the Index page
before each chapter slide with a progress indicator (I use an
animated arrow to flash next to the name of the next chapter), I
use a start button rather a 'next' button for the start of each
chapter. You should always have a module overview with the purpose
of the course and a summary slide which states what was covered and
they have complete the module.
11) Put a transparent click button somewhere on each slide.
Set the properties of the click box to take the learner back to the
start of the current chapter by pressing F2. This allows them to
jump back to the start of their chapter at any time. You can also
do a similar thing on the index pages which jumps them to another
chapter.
12) Recording video capture: best to do it at normal speed
and be concious of where your mouse is. Minimise your clicks. Most
people (until they start working with captivate) are sloppy with
their mouse and you end up with lots of unnecessarily slides that
you have to delete out. The speed will default to how you recorded
it and this will reduce the amount of time you spend on changing
timings.
13) Captions: My rule of thumb is minimum of 4 seconds - and
longer depending on the amount of words. Eg. Click 'Print Preview'
is 4 seconds, a paragraph is longer. If you creating knowledge
based modules, make the timing long (eg. 2-3 minutes) and put in a
next button so that the learner can click when they are ready.
Also, narration means the slides will normally be slightly longer.
14) Be creative: Capitvate is desk bound. There are some
learners that just don't respond no matter how interactive
Captivate can be. Incorporate non-captivate and desk free
activities. Eg. As part of our OHS module, there is an activity
where the learner has to print off the floor plan, and then wander
around the floor marking on th emap key items such as: fire exits;
first aid kit, broom and mop cupboard, stationary cupboard, etc.
Good luck!

Best practice for using messaging in medium to large cluster

What is the best practice for using messaging in medium to large cluster In a system where all the clients need to receive all the messages and some of the messages can be really big (a few megabytes and maybe more)
I will be glad to hear any suggestion or to learn from others experience.
Shimi

publish/subscribe, right?
lots of subscribers, big messages == lots of network traffic.
it's a wide open question, no?
%

Best Practice for a Print Server

What is the best practice for having a print server serving over 25 printers 10 of which are colour lasers and the rest black and white lasers.
Hardware
At the moment we have one server 2Ghz Dual G5 with 4GB Ram and xserve RAID. The server is also our main Open directory server, with about 400+ clients.
I want to order a new server and want to know the best type of setup for the optimal print server.
Thanks

Since print servers need RAM and spool space, but not a lot of processing power, I'd go with a Mac Mini packed with ram and the biggest HD you can get into it. Then load a copy of Xserver Tiger on it and configure your print server there.
Another option, if you don't mind used equipment, is to pick up an old G4 or G5 Xserve, load it up with RAM and disk space, and put tiger on that.
Good luck!
-Gregg

Best practice for RDGW placement in RDS 2012 R2 deployment

Hi,
I have been setting up a RDS 2012 R2 farm deployment and the time has come for setting up the RDGW servers. I have a farm with 4 SH servers, 2 WA servers, 2 CB servers and 1 LS.
Farm works great for LAN and VPN users.
Now i want to add two domain joined RDGW servers.
The question is; I've read a lot on technet and different sites about how to set the thing up, but no one mentions any best practices for where to place them.
Should i:
- set up WAP in my DMZ with ADFS in LAN, then place the RDGW in the LAN and reverse proxy in
- place RDGW in the DMZ, opening all those required ports into the LAN
- place the RDGW in the LAN, then port forward port 443 into it from internet
Any help is greatly appreciated.
This posting is provided "AS IS" with no warranties or guarantees and confers no rights

Hi,
The deployment is totally depends on your & company requirements as many things to taken care such as Hardware, Network, Security and other related stuff. Personally to setup RD Gateway server I would not prefer you to select 1st option. But as per my research,
for best result you can use option 2 (To place RDG server in DMZ and then allowed the required ports). Because by doing so outside network can’t directly connect to your internal server and it’s difficult to break the network by any attackers. A perimeter
network (DMZ) is a small network that is set up separately from an organization's private network and the Internet. In a network, the hosts most vulnerable to attack are those that provide services to users outside of the LAN, such as e-mail, web, RD Gateway,
RD Web Access and DNS servers. Because of the increased potential of these hosts being compromised, they are placed into their own sub-network called a perimeter network in order to protect the rest of the network if an intruder were to succeed. You can refer
beneath article for more information.
RD Gateway deployment in a perimeter network & Firewall rules
http://blogs.msdn.com/b/rds/archive/2009/07/31/rd-gateway-deployment-in-a-perimeter-network-firewall-rules.aspx
Hope it helps!
Thanks.
Dharmesh Solanki
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Best practice for "Quantity" field in Asset Master

Hi
I want to know what is the best practice for "Quantity field" in asset master. It should be made displayed only or required field in Asset Master creation.
Initially I made this field as required entry. So user entered 1 quantity. At the time of posting F-90, he again entered quantity. So my quantity in asset master got increased. Hence i decided to make that field display only in asset master creation.
Now i made that field as display only in asset master creation. At the time of posting F-90, that quantity field is not coming only. I check my field status group for posting key as well as GL account. Its optional field. Inspite of that user is able to make entry in F-90. Now quantity field is '0' only in asset master even though there is some value in asset.
Please help what is the best practice wrt quantity field. Should be open in asset master or it should be display only.

Hi:
SAP Standard does not recommend you to update quantity field in asset master data. Just leave the Qty Field Blank , just mention the Unit of Measure as EA. While you post acquisition through F-90 or MIGO this field will get updated in Asset master data automatically. Hope this will help you.
Regards

Best Practice for Extracting a Single Value from Oracle Table

I'm using Oracle Database 11g Release 11.2.0.3.0.
I'd like to know the best practice for doing something like this in a PL/SQL block:
DECLARE
    v_student_id    student.student_id%TYPE;
BEGIN
    SELECT student_id
    INTO    v_student_id
    FROM    student
    WHERE   last_name = 'Smith'
    AND     ROWNUM = 1;
END;
Of course, the problem here is that when there is no hit, the NO_DATA_FOUND exception is raised, which halts execution. So what if I want to continue in spite of the exception?
Yes, I could create a nested block with EXCEPTION section, etc., but that seems clunky for what seems to be a very simple task.
I've also seen this handled like this:
DECLARE
    v_student_id    student.student_id%TYPE;
    CURSOR c_student_id IS
        SELECT student_id
        FROM    student
        WHERE   last_name = 'Smith'
        AND     ROWNUM = 1;
BEGIN
    OPEN c_student_id;
    FETCH c_student_id INTO v_student_id;
    IF c_student_id%NOTFOUND THEN
        DBMS_OUTPUT.PUT_LINE('not found');
    ELSE
        (do stuff)
    END IF;
    CLOSE c_student_id;
END;
But this still seems like killing an ant with a sledge hammer.
What's the best way?
Thanks for any help you can give.
Wayne

Do not design in order to avoid exceptions. Do not code in order to avoid exceptions.
Exceptions are good. Damn good. As it allows you to catch an unexpected process branch, where execution did not go as planned and coded.
Trying to avoid exceptions is just plain bloody stupid.
As for you specific problem. When the SQL fails to find a row and a value to return, what then? This is unexpected - if you did not want a value, you would not have coded the SQL to find a value. So the SQL not finding a value is an exception to what you intend with your code. And you need to decide what to do with that exception.
How to implement it. The #1 rule in software engineering - modularisation.
E.g.
create or replace function FindSomething( name varchar2 ) return foo.col1%type is
id foo.col1%type;
begin
select col1 into id from foo where col2 = upper(name);
return( id );
exception when NOT_FOUND then
return( null );
end;
And that is your problem. Modularisation. You are not considering it.
And not the only problem mind you. Seems like your keyboard has a stuck capslock key. Writing code in all uppercase is just as bloody silly as trying to avoid exceptions.

In the Begining it's Flat Files - Best Practice for Getting Flat File Data

I probably should have posed this question here before I delved into writing Java to get data for reports, but better late than never.
Our ERP is written in COBOL. We have a third party ODBC which allows us to access data using a version of SQL. I have several Java sources compiled in my database that access the data and return something relevant. The Java sources are written in a procedural style rather than taking advantage of object oriented programming with attributes and methods.
Now that I am becoming more comfortable with the Java language, I would greatly appreciate any feedback as to best practices for incorporating Java into my database.
My guess is that it would be helpful to model the ERP "tables" with Java classes that would have attributes, which correspond to the fields, and methods to return the attributes in an appropriate way. Does that sound reasonable? If so, is there a way to automate the task of modeling the tables? If not reasonable, what would you recommend?
Thanks,
Gregory

Brother wrote:
I probably should have posed this question here before I delved into writing Java to get data for reports, but better late than never.
Our ERP is written in COBOL. We have a third party ODBC which allows us to access data using a version of SQL. I have several Java sources compiled in my database that access the data and return something relevant. The Java sources are written in a procedural style rather than taking advantage of object oriented programming with attributes and methods.
OO is a choice not a mandate. Using Java in a procedural way is certainly not ideal but given that it is existing code I would look more into whether is well written procedural code rather than looking at the lack of OO.
Now that I am becoming more comfortable with the Java language, I would greatly appreciate any feedback as to best practices for incorporating Java into my database.
My guess is that it would be helpful to model the ERP "tables" with Java classes that would have attributes, which correspond to the fields, and methods to return the attributes in an appropriate way. Does that sound reasonable? If so, is there a way to automate the task of modeling the tables? If not reasonable, what would you recommend?Normally you create a data model driven by business need. You then implement using whatever means seem expedient in terms of other business constraints to closely model that data model.
It is often the case that there is a strong correlation between data models and tables but certainly in my experience it is rare when there are not other needs driven by the data model (such as how foreign keys and link tables are implemented and used.)

Best practice for including additional DLLs/data files with plug-in

Hi,
Let's say I'm writing a plug-in which calls code in additional DLLs, and I want to ship these DLLs as part of the plug-in. I'd like to know what is considered "best practice" in terms of whether this is ok (assuming of course that the un-installer is set up to remove them correctly), and if so, where is the best place to put the DLLs.
Is it considered ok at all to ship additional DLLs, or should I try and statically link everything?
If it's ok to ship additional DLLs, should I install them in the same folder as the plug-in DLL (e.g. the .8BF or whatever), in a subfolder of the plug-in folder or somewhere else?
(I have the same question about shipping additional files too, such as data or resource files.)
Thanks
-Matthew

Brother wrote:
I probably should have posed this question here before I delved into writing Java to get data for reports, but better late than never.
Our ERP is written in COBOL. We have a third party ODBC which allows us to access data using a version of SQL. I have several Java sources compiled in my database that access the data and return something relevant. The Java sources are written in a procedural style rather than taking advantage of object oriented programming with attributes and methods.
OO is a choice not a mandate. Using Java in a procedural way is certainly not ideal but given that it is existing code I would look more into whether is well written procedural code rather than looking at the lack of OO.
Now that I am becoming more comfortable with the Java language, I would greatly appreciate any feedback as to best practices for incorporating Java into my database.
My guess is that it would be helpful to model the ERP "tables" with Java classes that would have attributes, which correspond to the fields, and methods to return the attributes in an appropriate way. Does that sound reasonable? If so, is there a way to automate the task of modeling the tables? If not reasonable, what would you recommend?Normally you create a data model driven by business need. You then implement using whatever means seem expedient in terms of other business constraints to closely model that data model.
It is often the case that there is a strong correlation between data models and tables but certainly in my experience it is rare when there are not other needs driven by the data model (such as how foreign keys and link tables are implemented and used.)

Best Practice for Conversion Workflow

Hello,
I'm converting video files from our "home grown" virtual media reserve to iTunes U. Some of the files are in RM format, some are already compressed .mov's (not H.264) and some I have the original DV files for.
Anyone out there have a best practice for converting these file types for posting to iTunes U? I have Final Cut Studio (Compressor), QT Pro and Squeeze available to me.
Any experience you have with this would be helpful.
Thanks,
Jeana

For converting old files to a podcast compatible video and based on the machine you have, consider elgato turbo.264. It is a fairly priced "co-processor" for video conversion. It is comprised of an application and a small USB device with a encoder chip in it. In my experience, it is the fastest way to create podcast video files. The amount of time that you will save will pay for the device quickly (about $100). Plus it does batch conversion of any video that your system currently plays through QuickTime. it has all the necessary presets and you can create your own. It has a few minor limitations such as not supporting (at this moment) enhanced podcasting features such as chapter markers and closed-captions but since you have old files for conversion, that won't matter.
For creating new content, the workflow varies a lot. Since you mention MP3s, I guess you are also interested in audio files. I would stick with GarageBand, especially if you are a beginner plus it supports enhanced podcasts.
In any case the most important goal is to have the simplest and fastest way to go from recording to publication. The less editing the better. To attain that, the best methods will require the largest investments. For example, for video production the best way is to produce the content live so when you finish recording it is only a matter of encoding and publishing. that will require the use of a video switcher that can ingest at least one video camera and a computer output to properly capture presentation material. That's the minimum. there are several devices that can do this for you. Some are disguised PCs and some connect to a PC for tapeless recording. You can check the Tricaster, which I like but wish it was a Mac and not a Windows Xp PC. Other routes may include video mixers from manufacturers like Edirol, Pansonic or Sony connected to a VTR or directly to a Mac for direct-ti-disc capture. I f you look at some of the content available in iTunes U, you will see what I explain here. This workflow requires preparation and sufficient live support but you will have your material ready for delivery almost immediately after the recorded event. No editing required. Finally, the most intensive workflow is to record everything separately and edit it later, which is extremely time consuming.

Best practice for dealing with Recordsets

Hi all,
I'm wondering what is best practice for dealing with data retrieved via JDBC as Recordsets without involving third part products such as Hibernate etc. I've been told to NOT use RecordSets throughout in my applications since they are taking up resources and are expensive. I'm wondering which collection type is best to convert RecordSets into. The apps I'm building are webbased using JSPs as presentation layer, beans and servlets.
Many thanks
Erik

There is no requirement that DAO's have a direct mapping to Database Tables. One of the advantages of the DAO pattern is that the business layer isn't directly aware of the persistence layer. If the joined data is used in the business code as if it were an unnormalized table, then you might want to provide a DAO for the joined data. If the joined data provides a subsiduray object within some particular object, you might add the access method to the DAO for the outer object.
eg:
In a user permissioning system where:
1 user has many userRoles
1 role has many userRoles
1 role has many rolePermissions
1 permission has many rolePermissions
ie. there is a many to many relationship between users and roles, and between roles and permissions.
The administrator needs to be able to add and delete permissions for roles and roles for users, so the crud for the rolePermissions table is probably most useful in the RoleDAO, and the crud for the userRoles table in the UserDAO. DOA's also can call each other.
During operation the system needs to be able to get all permissions for a user at login, so the UserDAO should provide a readPermissions method that does a rather complex join across the user, userRole, rolePermission and permission tables..
Note that f the system I just described were done with LDAP, a Hierarchical database or an Object database, the userRoles and rolePermissions tables wouldn't even exist, these are RDBMS artifacts since relational databases don't understand many to many relationships. This is good reason to avoid providing DAO's that give access to those tables.

Best Practice for embedding webi reports in hyperlinks..

SAP Community
What is the best practice for embedding hyperlinks (email) from webi and sending to a user?so the users can quickly consume the report with minimal effort (click link and launch infoview/report).
John

As mentionned already, BI has it's own inbox, and/or SMTP integration for broadcasting.
Else, if you go to Folders, right click on your report instance, then select "Copy URL" (or 'docuemnt link' i cannot remember the exact term.) - that woudl give you an open document link to invoke the viewer .
Regards,
H

Best practice for opening/closing JDBC conection

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