I'm wondering if many users can work on the same Enterprise Architect file ? our professor said it can be done if we can host the file in a repository and then link it to windows ODBC ? I'm not sure what does that means.
There are two ways to set up an EA project: stored in an .EAP file (accessed through the file system), or stored in a database (accessed through ODBC)
The file actually contains a database, and EA provides functionality for migrating both ways between the two.
An .EAP file can be accessed by several users simultaneously (with the file on a network drive), as of course a database can be. In either case, you are strongly encouraged to enable EA's "user security" in order to allow users to lock the parts of the project they are working on so they don't undo each others' changes.
An .EAP file can be used if the team is small. If there are more than 10 of you, you definitely want to set up a database repository.
So yes, several users can work in the same .EAP file. ODBC is a different way of setting it up; there is then no file as such but a database instead.
See Team Modeling Resources for Enterprise Architect.
Related
I have lately re-discovered embedded databases such as Sqlite (sql, relational) and LiteDb (noSql) and I like working with them for small web apps or mobile apps.
However, I cannot find any good answer to where to place them. Where to put them if:
The web app is likely to be containerized
The database can grow dynamically
Changes to the code and new deployments should not risk losing any change in database
1. Database file as part of solution (versioned in source control)
I've seen places where the *.db file is placed somewhere in the solution and it's versioned in source control.
I can see how this could be a problem as the database can be modified outside the context of development (i.e: when the app is up and running in production, the DB may change and in the next deployment the db may be overwritten if no backup/restore process in place)
Sometimes I have seen it inside wwwroot/App_Data. See this for instance. I assume App_Data is some kind of protected folder and its files cannot be server statically by the web server (is it?). Otherwise this is even worse.
2. Database file in binary folder
When testing, it's fine to have the database file generated somewhere in the bin folder, but this causes a similar problem as the previous one. What happens when a new software version is released and therefore the database file is overwritten in production?
So the questions are:
Is there any good practice regarding where to place embedded database files?
Is there any alternative to having backup/restore processes to avoid the described data-loss scenarios?
What happens when the app is contenierized and the database file grows once deployed? If the file is inside a container along with the running application, can it grow indefinitely? I don't recall specifying anything about a maximum size for containers anywhere when creating images..
Is having the DB in an external storage such a cloud blob store the alternative? I'm guessing the real benefit of embedded databases is gone if the file is in a different host.
Any good read about this would be appreciated.
PS:
I am asking for AspNet Core apps mainly because I see some projects using the wwwroot folder to place the embedded DB, but the question applies to any technology/framework.
This other question doesn't help either.
I just started a new position replacing a developer who left abruptly working on a project that is based in the Kentico CMS. I am completely unfamiliar with ASP and Kentico, so the answer here needs to be tailored for a total beginner. I am familiar with other languages (PHP, Ruby, SQL, etc.) but have no idea where to begin with this.
So, want I am wanting to do is copy everything from our production site (db and all) to my local machine so I can develop on it easier. I have already exported the db into an SQL file, and copied all the files in our Kentico Instance folder into github, and cloned it on my local machine. I assume since Kentico is already "setup," going through the installation process in their documentation is not the way to go about this.
Any help would be incredibly appreciated!
David, basically there are a few "pieces" to running Kentico locally. Since, as you mentioned, Kentico is already set up, you should have an easier go of it.
A database with the necessary Kentico tables (it sound like you
already have this)
The codebase (all of the code files that you copied to github)
A valid license for any domain you want to run Kentico on. Was the site already public facing? Do you know what licenses you have
or can you log into the CMS Desk on the site that you copied
everything from?
Set up IIS for your local website. If you are unsure on this one I can explain further, but basically you need to add a new site,
point it to the root code folder for your site, and set the domain
to be a domain you have a Kentico license key for. You'll also need
to change the app pool settings to "integrated" mode (most likely)
and also set the appropriate version of .NET (if it's a recent
version of Kentico you'll want .NET 4.0)
Next you'll need to edit your hosts file to add the domain and point it to your localhost IP address. So add a line like "127.0.0.1
dev.yourdomain.com" or the equivalent.
Edit the web.config file so that your code can connect to your database. You will need to edit the connection string accordingly to
point to the database on your machine.
Once you have done these steps, your site should start to run just as it had before. I didn't give great detail on all of these pieces so let me know what problems you encounter so I can further clarify. More information about the current situation would also help.
One other note I would make: if you need the client to be able to review your work, it will most likely be more efficient and easier for you to leave the original database on the web server, and (if possible) connect to it remotely from your local machine. Since almost any change you make will result in a database change in Kentico, I find it much easier to be working on 1 database for development with distributed codebases. Otherwise you will probably need to overwrite the other database with your changes constantly and this can be annoying. If you leave the database on the server and just connect remotely, you can just ftp (or use git) to push files to the server that you have edited locally.
I am developing a playbook app, where I am creating multiple databases. Can I get the location of the file/db created. I need to delete that Database, but I couldn't find a way to drop it, so I am planning to delete the file that it is stored in.
You can't drop SQLite databases, as you have found (hence my suggestion to simply drop all the tables).
However, if you really must delete the physical db file, I think your best bet is to mount the PlayBook's file system, and then track the file down. This link may help in explaining the file system layout on the PlayBook:
http://supportforums.blackberry.com/t5/Tablet-OS-SDK-for-Adobe-AIR/BlackBerry-PlayBook-File-System-Layout/ta-p/773327
It depends on the OS and browser you are using, I have no experience with Playbook and its browser, but for example under Windows XP and using Firefox it's stored on:
C:\Documents and Settings\USERNAME\Application Data\Mozilla\Firefox\Profiles\YOURPROFILE
and in Chrome there are two possible places:
C:\Documents and Settings\USERNAME\Local Settings\Application Data\Google\Chrome\User Data\Default\
There you have LocalStorage and Databases folders.
Hope it helps
I am currently working on a project where i need to store few files and folders in encrypted manner. This project will be platform independent and hence will be written in Java.
Instead of encrypting individual file and folder, we have been thinking of using some virtual file-system where a single container file will hold complete file-system.
Most of the open source virtual encrypted file-system tools we studied work on following principle.
mount the virtual file system (using secure password)
use this filesystem
finally dismount it
But the main problem here we face is that anyone who has access of the PC (e.g. network admin) will be able to see decrypted files when virtual drive is mounted. We want to restrict access to encrypted file system at process level. No one else in same OS session should be able to see the contents, hence no drive mounting, etc.
So we are looking for some open source tool which will provided some some APIs using which we will be able to access files in encrypted container without mounting it.
can anyone point us to any such library?
This thing I'd normally say was pretty cool.
http://www.pismotechnic.com/pfm/
But I've recently accidently copied a sub-repository in a mercurial repository to another folder and when that happened a lot of files got magically messed up. If you don't mind possible issues like that (eg. keeping backups) this could be a solution for you.
I've stumbled upon this question while hunting for an alternative because corrupted files are definitely not on my requirement list.
I need to manipulate some tables in a JET database housed on a web-server:
check existing indexes
change table cluster/primary key
see what tables exist
rename tables
add tables
drop tables
browse data
etc
I don't have the option of installing PlaneDisaster or Access (even if i had it) on the local machine.
I've already written a generic web-based query tool. I'd rather not have to get into writing a whole web-based database maintenance GUI. Someone must have done this already, and probably many times over.
A partial answer might be Compare'Em
http://home.gci.net/~mike-noel/CompareEM-LITE/CompareEMscreens/CompareEM-About.htm The Pro version allows you to create SQL statements to update the Access database file. This will allow you to generate the differences between one version and a newer version.
His website isn't very clear but as I recall the price for the Pro version was $10.
As you say you have already done a generic web based query tool. The problem with JET is that you cannot connect with it as database server like you can do with one SQL server in order to process changes to tables and other maintenance procedures. Jet is is not a client/server RDBMS. You need to have an application in the server to do that for you as you already have done with your generic web based tool, or download the database to your machine. That's why you have done some procedures and locate them in the server as asp pages.
Anyway you can use JetSQLConsole, if you don't want to use Planedisaster or Access, but remember that you need always an application on the server to to the job for you
You can also use access "in your machine" and connect to a database located in a URL (http://myserver/mydatabase.mdb) but remember when you are doing this you are downloading all the database and when you save it you are uploading it again.