ontop | query relational databases as Virtual RDF Knowledge Graphs | Database library

 by   ontop Java Version: ontop-5.1.0-beta-1 License: Apache-2.0

kandi X-RAY | ontop Summary

kandi X-RAY | ontop Summary

ontop is a Java library typically used in Database applications. ontop has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, GitLab, Maven.

Ontop is a Virtual Knowledge Graph system. It exposes the content of arbitrary relational databases as knowledge graphs. These graphs are virtual, which means that data remains in the data sources instead of being moved to another database. Ontop translates [SPARQL queries] expressed over the knowledge graphs into SQL queries executed by the relational data sources. It relies on [R2RML mappings] and can take advantage of lightweight ontologies. Compiling, packing, testing, etc.

            kandi-support Support

              ontop has a low active ecosystem.
              It has 560 star(s) with 154 fork(s). There are 55 watchers for this library.
              There were 6 major release(s) in the last 12 months.
              There are 51 open issues and 404 have been closed. On average issues are closed in 203 days. There are 12 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of ontop is ontop-5.1.0-beta-1

            kandi-Quality Quality

              ontop has 0 bugs and 0 code smells.

            kandi-Security Security

              ontop has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              ontop code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ontop is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              ontop releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              ontop saves you 177062 person hours of effort in developing the same functionality from scratch.
              It has 179847 lines of code, 13244 functions and 1998 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed ontop and discovered the below as its top functions. This is intended to give you an instant insight into ontop implemented functionality, and help decide if they suit your requirements.
            • Called when the user presses the dialog
            • Translates an ontology into a single one
            • Gets empty concepts in the ontology
            • Returns a set of indices for the ontology
            • Performs the UI actions
            • Retrieves the mapping from triplesMap
            • Returns a string representing the selection of a query
            • Performs the action
            • Returns the ontology reasoner which is applicable to the user
            • Create a new dialog with new items
            • Initializes the table model
            • Initialize the JdbcRegistry
            • Serialize a SelectFromWhereWithModifiers
            • Create a spark SQL type map for the given TermType
            • This method is used to compute the Geometry
            • Creates a map of Rbi ids to SQL ids
            • Binds all options
            • Builds a message based on indicator information
            • Create a map of RDB terms
            • Runs the ontology definition
            • Configures the core classes
            • Initialise the panel
            • Serialization for SelectFromAndModels
            • Create a database type map for the given root term type
            • This method initializes the cell renderer component
            • This method converts the query into a native query
            Get all kandi verified functions for this library.

            ontop Key Features

            No Key Features are available at this moment for ontop.

            ontop Examples and Code Snippets

            No Code Snippets are available at this moment for ontop.

            Community Discussions


            Swift Uikit navigate to starting view programmatically
            Asked 2021-Jun-07 at 14:20

            I have an Ios app build with Swift UIKit, where all views are embedded in a bottom navigation within the soryboard. I want to navigate to the home view (starting view) from another view on a button click programmatically, so not presenting it above the current view or pushing it ontop, so that a "back" button won't appear, same as if a user would just load the app for the first time,

            How can I accomplish something like that?



            Answered 2021-Jun-07 at 14:20

            If I understand well, put this code in your tap action func:

            Source https://stackoverflow.com/questions/67860652


            Adding jdbc driver when creating Ontop Virtual repository problem
            Asked 2021-Jun-04 at 19:51

            I'm having problems adding a jdbc driver when creating an Ontop virtual SPARQL repository. I follow the instructions here. The interface already warns that there is no JDBC driver found in the classpath. There is also a link to the download site where you can get the drivers. That all works. But adding the driver to the lib path (in the case of a Linux installation \opt\graphdb-free\app\lib) and then restarting GraphDB does not work. GraphDB is still reporting that the driver is not found.

            I did try a lot of things. Adding the correct .jar to the CLASSPATH did not work. Using several other potential lib directories (the instructions are not precise on which directory to choose) also changed nothing. Then I took a look in the files you can create under Help - System Information - New Report. I found that all the .jar files in \opt\graphdb-free\app\lib were 'registered' (don't know if that is the correct term), but not the new one I placed there.

            Tried adding other .jars (for MS SQL, next to the MySQL that I needed). Same problem. Then I tried something weird that actually worked. I renamed a .jar that I thought I wouldn't need to .backup and then renamed the mysql driver .jar to that original .jar (hope this is not to confusing). Restarted Grapdb and it worked!

            What am I missing here? Is the list of .jars that are in the lib directory hardcoded somewhere? Very curious how to configure this the right way.



            Answered 2021-Mar-11 at 11:36

            There is a config file, named graphdb-free.cfg, within graphdb-free/appfolder. Open it and alter the app.classpath property by adding the additional jar(s) for the JDBC driver to the list. Save and restart

            Source https://stackoverflow.com/questions/66318179


            How to display fixed background image behind all other content
            Asked 2021-May-16 at 22:34

            I'm trying to add a fixed background image and show behind normal text content from another div. Image needs to be fixed, so that the rest of the content of the page can be scrolled and full image stays visible. The background image needs to be in a separate div (that's how the HTML is currently structured and I can't change it).
            For some unknown reason, the background image keeps covering all content. How do I make it show behind content?

            Side notes:

            1. I have Bootstrap 5.0.1 loaded, but Bootstrap is not at fault here.
            2. I tried playing around with z-index but with no success.

            Code snippet:



            Answered 2021-May-16 at 16:22

            I think it is because you're img container is in a parent div (and the z-index does not work). If you want to place it behind your text, try to place it at the same level or at a higher-level in the DOM and then play with z-index.

            Source https://stackoverflow.com/questions/67558948


            When scrolling really fast in a UITableView, I get a nil error. Cant figure out how to fix
            Asked 2021-May-13 at 15:34

            I included all of the code below.


            The cell has two images, a background image (which is blurred) and another image ontop of that which is not blurred. When a user scrolls really fast in the tableview, I get the following error:



            Answered 2021-May-13 at 15:34

            This line makes no sense

            Source https://stackoverflow.com/questions/67521761


            How can i write UnitTest for my Flask API
            Asked 2021-May-07 at 16:02

            I'm fairly new to unit testing, and im required to write some unit test for my flask api. Any idea how I can write unit tests for this code below? Any examples and help will be appreciated. I tried to create a seperate file to start unittesting but im not able to import the flask app into the file as it gives me module errors. And ontop of that im not sure how to test each function in this application.



            Answered 2021-May-07 at 16:02

            First of all, I recommend to use pytest.

            In order to be correcly unit-tested, your program should be split into simple functions that preferably perform only 1 task.

            Since you are working with requests, you may want to test your HTTP calls. A good way to test them is to use responses in order to mock the target server or API.

            Pragmatically, start to create a folder tests/ and create a file per class or per function, named after the class or the function you want to test (like so test_your_function.py). Inside this file, write unit tests for your functions (i.e. a function that starts by test_ so that pytest will identify it as a unit test). Each unit test should contain an assert tested_output_value == expected_output_value statement, so that your unit test fails if your function does not return the desired tested_output_value.

            For instance, if you want to test your function predict one way to do it would be write a function that requests your localhost server and to verify that the response is what you expected. N.B.: Before running pytest, make sure that you have started your server ;)

            Source https://stackoverflow.com/questions/67438113


            geom_raster() produces a whitish surface ontop of the map
            Asked 2021-May-06 at 20:53

            I am trying to plot a heatmap ontop of a geographical map to show the geographic distribution of a variable. The minimum working code, with absurd data, is the following:



            Answered 2021-May-06 at 20:53

            If I understood correctly the issue, it seems like the NA in the raster are not completely transparent. See if in scale_fill_viridis_c changing to na.value = NA does what you're looking for.

            Source https://stackoverflow.com/questions/67425355


            If I use paintComponent, how do I show a JLabel?
            Asked 2021-Apr-27 at 02:16

            I'm relatively new to Java, and I was making a game where you dash up and down to avoid obstacles. I was almost done with all the main features, and had to do the score system and the background. Thinking the score would be easier, I wrote out a JLabel and added it to my JFrame. It flashed and disappeared. I'm fairly certain this is because I add the whole graphics method directly after, or something like that. But, if I add the JLabel after, that's all that gets added, and it takes up the whole screen.



            Answered 2021-Apr-27 at 02:05

            Source https://stackoverflow.com/questions/67276005


            python creating new list using a "template list"
            Asked 2021-Apr-26 at 21:11

            Suppose i have:



            Answered 2021-Apr-26 at 19:02

            This extends your loop into a larger number of values. I can't think of a numpy one-liner to do this.

            Source https://stackoverflow.com/questions/67272291


            Centre an image on top of a CSS shape?
            Asked 2021-Apr-24 at 15:38

            I am trying to center an image on to a Hexagon made using CSS.

            The code I currently have is:



            Answered 2021-Apr-24 at 01:34

            Just move it? I'm somewhat sure it's not the best solution, but still.

            Source https://stackoverflow.com/questions/67238452


            Player falls halfway throufh the floor till the outer edge of collider. instead of the inner edge
            Asked 2021-Apr-21 at 18:37

            As you can see in the included video the player falls over the floortile till the outer edge of the floor. Instead it should stop at the inner edge of the tile so it looks like its standing ontop of the tile. Can anyone help? I cant find anything on the internet regarding my issue.

            Im sorry if this is a easy fix. Im a beginner. This for a school project :)

            Video: https://streamable.com/99jz2o enter image description here

            Photo of sprite standing on the wrong edge of the tile.

            Edit: I went back to the tile palette and redrew the level. This time selecting the game object + bitmap again. Now it works. Probably the reason why it didn't work was that when I drew the level I had not added Tilemap Collider 2D and Composite Collider 2D. Now redrawing with those 2 components added it works as it should!



            Answered 2021-Apr-21 at 16:38

            The problem is with your tile map collider. Instead of using this, set empty game objects as children of the objects that make up the . Then, add BoxCollider2Ds to each one, and add scale them to fit the map. If that doesn’t work, then it is either a problem with the rigidbody, or the box collider, make sure that all of the settings are set to default, then slowly change them back, and you will discover what is causing the problem. Then you can comment on this post what variable changed it.

            Source https://stackoverflow.com/questions/67199174

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install ontop

            You can download it from GitHub, GitLab, Maven.
            You can use ontop like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the ontop component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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