To much of my disappointment https://github.com/realm/realm-java doesn't actually have the actual realm code, just some binding. I can't risk including some random binary code into my app, that's why I'd like to build the whole thing from sources myself.
Or wait, is Realm actually open source?
Our binding code (Java / JNI) is open source under Apache 2. The core database is still closed source. So I am sorry if that is a deal breaker for you.
We said from the start that we will be open sourcing Realm Core under Apache 2, and that is still the plan: https://realm.io/docs/objc/latest/#i-see-references-to-a-core-in-the-code-what-is-that
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I need some advice on the project im working for fun during the summer. Say im writing a software that helps creating the roster base on the availiabilities of the staffs. I need some advice on how to implement these items below:
A database that holds the infomation of the staffs (ie.
availiabilities, minimum hours, maximum hours).
The core of the software where the process of arranging staffs on a day base on the database.
A GUI that displays the final version of roster after step 2 above so it can be printed out by the manager.
Im thinking of using Java but not sure how i to implement and connect the database, the core and the GUI together? Can i do everything listed using Java?Can anyone please suggest me a solution or an article for this?
There are many different paths you could follow, depending on what your end goals are.
DO you want to learn Java or are you just trying to practice application development ? I am assuming you are interested in an application that runs on the web.
For me, the best choices are either Java or PHP, but this is largely based on my own experiences. Others might argue that Python or Ruby would be a better to start.
For a Java based solution, you would use: Java JSPs with HTML for the front end (Javascript and JQuery optional); Java (Servlets) for the middle tier; JDBC, JPA, Spring, and/or Hybernate to connect to the DB; MySQL is a good candidate for the DB, but there are other options.
For a PHP based solution, you would use: PHP, HTML for the frond end (Javascript and JQuery optional); PHP for the middle tier (there are frameworks you coulse here as well); PHP to connect to the DB; MySQL is a good candidate for the DB, but there are other options.
If you dont know either, I think PHP is easier to setup and run for beginners, and is the basis for many open source and commercial web applications (e.g., WordPress); but Java is used for most large scale applications.
I have build an app in swift that downloads content from my ubuntu server. The content on my server is build with help of some php/javascript scripts and stored in a mysql database, before it is send to the app. However I can't actually test this content, until I download it on the app, which causes me to spend hours on hours testing all the input.
I could make my workflow flow 10x faster if I could test it on the server. Luckily Apple released open source swift half a year ago, so I figured I could just copy the relevant swift code from my app to the server.
However it doesn't seem there is any way to access my database with open source swift and neither is NSURLSession.sharedSession() implemented yet, so I have no idea how to access my database on my server.
My database is mysql, but I wouldn't mind changing it to sqlite or some other type of database, if that would help solve the problem.
So there is my question, how do I access a database with open source swift on ubuntu?
I found a package that gives me access to a mysql database from swift:
https://github.com/novi/mysql-swift
I found some other similar packages as well, but I didn't test any of those, so I don't know whether they are any good.
I'm in the process of upgrading an existing application to .NET Core (DNX SDK 1.0.0-rc1-update2) that uses SQL Servers FILESTREAM feature for reading/writing large BLOBs to the database. It uses the SqlFileStream class to achieve this however it doesn't appear to be available in .NET Core. Here are my references in project.json:
"frameworks": {
"net451": {
"frameworkAssemblies": {
"System.Runtime": "4.0.10.0",
"System.Collections": "4.0.0.0"
}
},
"dotnet5.4": {
"dependencies": {
"Microsoft.CSharp": "4.0.1-beta-23516",
"System.Data.Common": "4.0.1-beta-23516",
"System.Data.SqlClient": "4.0.0-rc2-23623",
"System.Collections": "4.0.11-beta-23516",
"System.IO.FileSystem": "4.0.1-beta-23516",
"System.Linq": "4.0.1-beta-23516",
"System.Runtime": "4.0.21-beta-23516",
"System.Threading": "4.0.11-beta-23516"
}
}
}
I've tried searching SO and Google, both of which have absolutely nothing on the subject.
Can someone please confirm if its actually unavailable or if its in another package I'm unaware of?
I realize the question is old, but I just came across the issue - implementing SqlFileStream - listed on the github repo for CoreFX (.NET Core foundational libraries) and thought I'd mention it here. Here's a link to the issue, for reference: https://github.com/dotnet/corefx/issues/15652
To recap: The issue is implementing SqlFileStream. It's currently an open issue, but not on the horizon anytime soon. One of the contributors states "if there are any Windows specific dependencies, we may not bring it in Core."
I've actually been interested in this for a while and have taken some time over the last few days.
Unfortunately, FILESTREAM uses several NTFS and NT specific system calls (NtCreateFile, DeviceIoControl in particular, but a few others to support those as well) to manage access to the file. Also, unfortunately, as of this writing the latest MSSQL CTPs for Linux don't support FILESTREAM, and there's little clarity as to whether that's on the roadmap or where it might be (strangely, you can restore a database that supports FILESTREAM but FileTable doesn't seem to be supported).
There are two problems here: it's not clear that replacing the NT specific APIs would respect transactional integrity (or even work at all), and it's not clear that they could ever work from a non-Windows environment anyway. Because of these facts, I don't see SqlFileStream being supported any time in the near future for core.
There is some precedent for Windows Only type of low level, for example in System.Net.Socket.IOControl. SqlFileStream could perhaps take a similar path. Alternatively, it might be possible to build a specific SqlFileStream NuGet package, but have it only be supported/runnable on Windows. I'm not sure how valuable this would be though - if you're going to P/Invoke in a Windows only way to begin with, why not just P/Invoke to a .NET 4.6.x dll?
Cross posting this to the github issue: https://github.com/dotnet/corefx/issues/15652
Edit: As an alternative to P/Invoke, you could certainly create some other kind of service (RESTful, WCF, some other pipe or TCP or even memory mapped file) in .NET 4.x for a .NET Core library or application to access.
As some of us have noted, parse.com will be shut down in January 2017. In the current version of parse4cn1, all requests go to https://api.parse.com, using the constant ParseConstants.API_ENDPOINT. Will it be possible to supply a custom URL here, pointing to a different Parse Server? If not, can I build parse4cn1 from source myself? Or should I be looking for an alternative to Parse?
See these related questions:
Will Parse4cn1 still work after Parse server retirement?
parse4cn1 has some issue when working with Node JS and parse-server open source
I now have some time available and intend to make the change you proposed within the coming month or so and make a release that is compatible with the open source Parse server. If that's too late for you, consider making the changes yourself and contributing back via a Github pull request. The Contributing section of the parse4cn1 repo provides useful tips.
Regarding looking at Parse alternatives, that's a decision you'll have to make yourself based on your needs and timeline. My gut feeling is that the Open Source Parse Server will mature and grow in features in the months leading up to the official retirement of Parse.com.
I have to create a data base management system as a project for the school but I don't know how to. It doesn't have to be very sophisticated. Is there any tutorial that shows how to do it? And, what would be the most appropriate language to do that?
Do you need to actually build a database engine? Or do you need to use a database engine to create a database that you write a program to use?
Without knowing exactly what you're after, for the latter, I'd recommend you get ahold of the MAMP (on Mac) or WAMP (on Windows) stacks. this gives you Apache, MySql, and PHP on top of your favorite OS. Following google threads on those topics should lead you to plenty of examples.
If you have to actually build a database engine... well, here's another SO question that might help: Simple Database Implementation for Educational Purpose. Also, you might search through Github for open source examples.
Good luck!
I suggest this repository:
Prerequisites :
Good understanding of algorithms & dynamic data structures like trees - B-trees.. (it's all about structuring data and handling it using optimized algorithms's implementation)
Proficiency with C programming language ( pointers , structures-unions-typedef..) .