I want to create HSQL embedded database but jdbc:hsqldb:file:"What should I write here to work on other PC". If I copy my project to another pc and click the jar file , it needs to access my database. So, what should I write for file path ? My application works on my PC but does not work on other PC because it does not access the database.
Please help me. Thank you.
If you're trying to access a file that isn't located on the same machine, you're most likely out of luck, unless you can set up a link, file sharing, etc.
If you want to make the file location configurable, then use a system parameter, a config file value, etc. and construct the JDBC string from that, e.g.,
java -jar some.jar -Ddb.location=/some/file/path
...
String url = "jdbc:jsqldb:file:" + System.getProperty("db.location");
If you want to access a DB server then you're probably going about this the wrong way.
Related
I am deploying a Delphi Firemonkey app on Mac OSX and being new to Mac programming I am wondering where I should install the sqlite database file.
Under Windows I usually put it in the application installation directory but this isn't appropriate on a Mac (I think!).
There will not be a need for multi-user access to the db file
I have currently placed it in /Library/Application Support/Myapp/Myapp.db but wonder if there is a better (or official) place to put it.
I'd suggest that you take a look at the guidelines from Apple.
You can use '/Library/Application Support/Myapp/Myapp.db' if the database does not contain user specific data. Otherwise use '~/Library/Application Support/Myapp/Myapp.db'.
Please don't hard code those folders, but use NSFileManager.URLForDirectory for retrieving them.
I currently have a C# Application that is a distribute, and that multiple people have. I was wondering which approach could I take to hide the app.config file (.exe.config) file that is produced after a build, So that the users cannot see my connectionstrings to my remote server. I read somewhere that If I encrypt the file, It can only be decrypted on the machine It was encrypted on, which means that It would not work for the other computers that the application is on, It would only work on my PC. Which approach could I take so that The config file can be hidden / obfuscated / encrypted, or anything to protect the config file, But without it being specific only to my computer, that can actually work for any one else who has the distributed version?
Any help would be appreciated, Thanks
Do not ever give a credential to someone if you don't want them to be able to use it. It really is that simple. You cannot both give a credential to and withhold a credential from the same entity. Whatever security checks you need to do, do them on your machine. That way, even someone who has the connection strings cannot bypass any security check you care about.
If you are worried about exposing addresses of other machines you might want to consider putting these machine behind a router machine.
This way client machines and their users only know about the proxy and the remote machines would only have to be open to and trust the proxy.
Even if you encrypt the config file:
the machine will need to decrypt the file to use the connection information so the secret is out any way
using a network sniffer the user can always see to what machines his machine is connecting.
I'm creating a program in VB.Net that heavily interacts with 2 large MSSQL databases. I do not know a ton of vb and I'm fairly new, but I would assume just having the connection strings in the code and releasing the program it would be quite easy for someone to reverse the program and get my connection info? correct me if I'm wrong.
My question is I'm wondering if there is a safer way to use a connection string in my program. Would I just have to encrypt my app? Create a module or dll?
You can encrypt just the portions of the .config file which contain the sensitive material, in this case connection strings.
The answer is aspnet_regiis.exe
The location may vary depending on your system and version of .NET, but a file search should narrow it down.
Let's say you have a program called myapp located in c:\dotnetaps\myapp.
I use the following command to encrypt the "connectionStrings" portion of web.config:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -pef connectionStrings C:\dotnetapps\myapp
Wait a second: web.config is only for web apps, not local ones, right?
aspnet_regiis.exe only works for web.config, but the format is exactly the same as app.config. Therefore, all you need to do is rename app.config to web.config, run the tool, and rename it back. A little awkward, but nothing that can't be automated by a batch file.
# Encrypts connectionStrings in app.config
ren C:\dotnetapps\myapp\app.config web.config
path\to\exe\aspnet_regiis.exe -pef connectionStrings C:\dotnetapps\myapp
ren web.config app.config
Important note: Using literally these commands will encrypt the file against the particular system it is running on. You'll want to do a little reading to get it to encrypt against a key that allows you to distribute your code, but this is the general idea.
You could store it in your resources file (MyFile.resx) as an encrypted string.
Whenever I open one of the Quantum Grid demos in Delphi XE Pro (on Windows 7 32-bit), the following error is displayed for every table (I think) in the project:
error message http://www.tranglos.com/img/qgerror.png
The message is:
Network initialization failed.
File or directory does not exist.
File: C:\PDOXUSRS.NET
Permission denied.
Directory: C:\.
I understand permission issues writing to c:\, but the result is that while I can build and run the demo projects, no data is displayed, which makes the demos rather useless. And what kind of database writes its configuration to c:\ directory in the 21st century anyway? :) (Yes, I know very little about Paradox databases, but I won't ever be using one either. I just want to learn how to use the grid.)
Using BDE Administrator I've tried changing the Paradox "NET DIR" value to a folder with write permissions on the C drive. Result: now the database tables cannot find their data:
Path not found.
File: C:..\..\Data\GENRES.DB.
...and the unhelpfully truncated path gives no indication where the files are expected to be.
Is there a way to work around the problem so that the demos can load their sample data correctly?
Did you install the BDE correctly? It should use the DBDEMOS files. Do you see such an alias in the BDE administration utility? Can you open that database in one of the Delphi demos?
The BDE is not a XXI century database, it was developed twenty years ago and never upgraded lately. It's an obsolete tecnology, but because it comes still with every release of Delphi with a known database it is still often used in demos because nothing new has to be installed.
Anyway that file is not its configuration file. It's a sharing lock file to allow more than one user to use the database concurrently. Because it is a file based database without a central server, it has to use such kind of shared files. Usually its position is changed to a network share, but it defaults to C:\ for historical reasons.
Anyway it's not only the BDE still attempting to write in the prong directories. I still see a full bunch of applications attempting to write to C:\ (especially logs) or other read-only positions.
Using BDE Admin to change the location for PDOXUSRS.NET helped, but it wasn't sufficient. DevExpress did the right thing in specifying a relative folder for the data location, and the relative folder seems perfectly allright, but for some reason the DB can't find it.
Solution: under the \Demos\ folder find all the *.dfm files that contain the string
..\..\Data
and replace that string with the absolute path to the demos folder. That done, all the demos open correctly.
I know this message from our own applications. It has to do with security measures introduced with Windows Vista. The operating system trying to protect critical files denies access to them. There is a method how to bypass this mechanism without compromising security. Try to run your application in compatibility mode. When application is running in compatibility mode, read / write operations from / to system folders are redirected to "safe" directories located in C:\Users[Current User]\AppData\Local\VirtualStore.
More info on http://www.windowsecurity.com/articles/Protecting-System-Files-UAC-Virtualization-Part1.html.
I have started coding an FTP client application (for fun). I’m trying to represent remotely hosted files with icons. For example, let’s say I’m browsing the root folder of an FTP server (/) and want to display the Backup.zip file with the icon association from that client operating system. On some systems, this may be the windows compression icon and other operating systems this may be WinZip or WinRAR icons.
I have the client browsing local files with the SHGetFileInfo() function. This works great with files that are local, however, this function requires the physical file in order to retrieve the associated icon. So, this will not work with remotely hosted files. I have found some samples of loading icons given a file extension, and this is really where the question comes in... What would be the best strategy to get icons associated to remote files?
Go to the registry every time and look up extension to icon associations
Create 1 byte files with each extension and use the SHGetFileInfo() function for remote files (using local 1 byte files as association for remote files)
Other strategies???
What would a professional software company creating an FTP client do?
Thank you for your time.
-Jessy Houle
I suggest that you don't go to the registry every time: go if you need to, but if you've already been for a given filetype then remember/cache that result (within your program) and reuse it.
Use the procedure here from a previous Stack Overflow question on the same idea and uses the registry instead of an actual file.
How can I get the filetype icon that Windows Explorer shows?