Where and how do wikis that use the MediaWiki software store their articles?
In a MySQL database, typically.
Nowadays MediaWiki also supports other databases, such as PostgreSQL. For details, read the "Database server" section here.
Edit: as to how MediaWiki stores the articles, see Manual:Database layout for much details, such as a diagram of the database schema and the SQL for creating the tables.
select * from page
left join revision on page_id=rev_page
left join text on rev_text_id =old_id
limit 100;
This sql-query shows which table and how MediaWiki software store their articles.
In a MySQL database. I've tried using PostgreSQL but encountered a Mediawiki bug in searching text.
Related
I am creating a dashboard in Apache Superset. I want to create a funnel representation of my overall data. I didn't find any funnel charts. Is it possible to add user defined visualizations on superset. If yes, what is the method to do so. If no, what are its alternative (I am aware of bar charts)
I have followed this https://shopup.me/blog/beginners-guide-set-superset-opensource-bi-platform-ec2-aws-instance/ documentation to install superset on my machine.
you can definitely create your own custom visualizations (but I will warn you that adding custom viz plugins isn't a mature feature set yet). Here are some helpful links:
https://preset.io/blog/2020-07-02-hello-world/
https://medium.com/nmc-techblog/apache-superset-manage-custom-viz-plugins-in-production-9fde1a708e55
I will say that there are many ways to visualize funnels, which I talk about in this blog post: https://preset.io/blog/2020-07-14-funnels/
I am trying to migrate DB2 LUW 9.7 databases and data to PostgreSQL 9.3. Any suggestion on which will be the best approach to do it? Which will be the best tool or any open source tool available to perform this?
The db2look utility can reverse-engineer your DB2 tables into DDL statements that will serve as a good starting point for your PostgreSQL definitions. To unload the data from each table, use the EXPORT command, which dumps the results of any SQL SELECT to a delimited text file. Although the db2move utility can handle both of those tasks, is not going to be of much help to you because it extracts the table data into IBM's proprietary PC/IXF format.
If you're moving off of DB2 because of price, IBM provides a free-as-in-beer version called DB2 Express-C, which shares the same core database engine as paid editions of DB2. Express-C is a first-rate, industrial strength DBMS that does not have the sort of severe limitations that other commercial vendors impose on their no-cost engines.
I had gone through the tutorial in Prestashop at http://forge.prestashop.com:8081/display/PS14/Using+the+REST+webservice but it doesn't guide on how to do query on multiple table.
How should I perform it?
The trouble with per-table RESTful web services is they only provide terse access to your data layer. For multi-table joins and subqueries, you're left to either query multiple REST endpoints and perform the reconciliation on the client side or to perform the desired query in SQL and expose it directly through your web service.
From this post:
While importing products is a built-in feature in PrestaShop,
unfortunately, exporting products is not. There are quite a few
modules available for PrestaShop that offer this feature, but finding
a free one is definitely a challenge. Most likely this is due to the
intricacies of the PrestaShop database table structure. Product data
is stored in multiple tables, which means the query to extract that
data is not easy to create.
If you are comfortable running SQL queries, you can use the SQL tab of
phpMyAdmin in your cPanel to query the database tables for the product
information you want to retrieve. However, for most people, this will
not be a workable solution.
You might want to look at the code they provide. It may give you some idea of how to do this in a way that plays nicely with PrestaShop.
i'm new to the nosql world, and from forums and articles that i've read: most of users try to "mix" nosql tools, for example, they use Cassandra and MongoDB together to make a "powerful system", because am beginning with MongoDB, i've downloaded the DjanMon project (am a django fan ^_^ ), of course i've downloaded the special version of django that accepts the NoSql use: Django NonRel, and i've noticed that the Setting file dont "oblige" you to use one specific NoSql solution like in Django with RDBMS where you must specify MySql or PostegreSql or other solution, so, is it possible to mix lot of (or two of course) NoSql solution using Django (for example MongoDB+Cassandra)?
There's nothing to stop you using multiple storage solutions, whether SQL or NoSQL - but the NoSQL solutions all have different architectures, data models and APIs (For example, MongoDB is a document-oriented database, whereas Cassandra is Column-oriented), so you can't usually swap one for another without some effort.
Can you clarify what you are actually trying to achieve? I.e. why are you interested in mixing these two specific solutions?
Is there a webapp that lets me draw out the structure of a database and link keys visually?
First of all, a pencil and paper or whiteboard is more useful until you get your schema right.
But I've found Gliffy to be a good online flowcharting solution. it supports db schema and some other useful types. You can save your work on the server and print out.