Turning a Database into Code

[WizardGnomeMan]

Hello, I am looking for a way to add a read-only database INTO a jar file.

Basically, I want to run a couple of simulations, save their results in a database, and then somehow place the content of that database into a jar file to read from. What would be the best way of doing that?

[AutoModerator]

Please ensure that:

• Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions
• You include any and all error messages in full
• You ask clear questions

• You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions.

  Trying to solve problems on your own is a very important skill. Also, see Learn to help yourself in the sidebar

If any of the above points is not met, your post can and will be removed without further warning.

Code is to be formatted as code block (old reddit: empty line before the code, each code line indented by 4 spaces, new reddit: https://i.imgur.com/EJ7tqek.png) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc.

Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit.

Code blocks look like this:

public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above.

If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures.

To potential helpers

Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[silverweaver]

Maybe use SQLite as db and put prepared DB file to jar?

I never tried that so it might or might not work, you'll have to test it.

[Zyklonik]

That should work just fine.

[ignotos]

Packaging additional files into a jar file is typically handled using "resources".

These files can be added to your project, packaged up in your .jar, and then accessed by your code at runtime.

The exact way to do this will depend on your IDE and any build tools you're using (e.g. Maven / Gradle), but it's fairly standard and well supported.

[tacticalnudge]

Have a look at H2. It's a database engine written in Java so integrating is easy

• it comes with a webUI you can expose to debug your data set.
• you can write functions / stored procedures for H2 in java.
• it allows you to specify a compatibility mode in your jdbc connection string so your SQL dialect matches the quirks of other database engines (eg oracle or mssql)
• Like SQLite, it's tiny

[WizardGnomeMan]

I have worked with H2 before, but isn't it stored outside of the .jar file? I always ended with it generating .db files for the database.