database-schema | Database Schema | Database library

I have the following database-schema:

I have the following example data:

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Queries are executed on the public StackOverflow Bigquery on Google Cloud Platform. This Bigquery contains, amongst other tables, posts_questions and votes, the first containing all questions and the second contains cast votes on these questions.

posts_questions schema:

vote Schema:

There exist 16 different vote_type_ids and according to this post on Meta, vote_type_id 6 corresponds to a close vote. After three close votes were cast by users, a question appears as closed on StackOverflow. The following query, therefore, returns the id and URL of 10 closed questions.

So I implemented a 3 table tag solution, als indicated in this classic post (so-called "Toxi" solution). Everthing works splendid, the only thing I struggle with is to get all items that are tagged with more than one tag.

My first solution used IN and worked fine but of course gave me all items that had any of the provided tags. But one I really want is all items that have each of the provided tags.

So I tried to :

My problem: Stuck on implementing change of schema after user login, following a StackOverFlow.

Description: Im using the class below. However, I have no idea on how to use it. Im reading every tutorial but I'm stuck. The result I'm expecting are:

1- Spring initializes with the default URL so the user can login.

2- After a successful login, it changes to the schema based on the UserDetails class.

I'm following the Stack Overflow solution at: Change database schema during runtime based on logged in user

The Spring version I'm using is

I am building an API using Django Rest Framework, and I'm trying to make it as RESTful as possible. Following this question (and also this question on SoftwareEngineering), I have described a number of resources that my API endpoints will expose, such as an Invoice that can be seen at the following URL: /api/v1/invoices//

However, I am having trouble relating the RESTful design principles to the concrete workings of Django Rest Framework. It is unclear to me what constitues a resource: the model, the serializer or the view?

In particular, I am confused about the correct place to implement my calculate_total() method. In a regular Django application it would certainly live in the the Invoice model:

In a postgres database, the schema name is set as the buyer id(so, if buyer id is buyer_2213 then schema name will be buyer_2213). These schemas have multiple tables and these tables have common structure for all schemas.

Now, I am writing REST API using spring boot to get buyer data from these schema, but since schema name is buyer id dependent, I have to write manual queries and could not use JPA features for that.

Is there any way to set schema name to entity using REST API request parameters. So, in below entity, can we set schema using buyerId passed at API call defined in BuyerController:

This link How to generate persistence mapping by database schema during build of the project? described a way to generate persistence mapping by database schema - automatically creating entity classes for Hibernate.

I've followed the instructions and proceed this with settings: The result of this was different from expected. The table was created in MySQL with this script:

I have to implement OAuth for .NET Core and the decision is IdentityServer4. In fact, result should be an Authentication Endpoint also with login UI, reset password UI etc. However, OAuth must be fitted to existing database structure. So I cannot simply follow easiest 'Quickstart' manuals.

I am trying to understand concept of IdentityServer4 and I am confused about ASP.NET Core Identity and it's role in it. As far as I know, the ASP.NET Core Identity provides framework for user management including signin, signup, password reset etc, including database (with EntityFramework).

I have an existing SQL database which I have to use, there is no chance to any change. However, structure is similar to ASP.NET Core Identity so I assume it may be used (somehow). I found articles how to implement sort of 'custom users'

A/ directly to IdentityServer4, article here

or

B/ to ASP.NET Core Identity, article here

Both ways are doable, back to original question - I would like to just get bit deeper to IdentityServer4 and find out how much it relies on ASP.NET Core Identity.

Thanks a lot!

I am interacting with a MySQL database in golang using database/sql with the github.com/go-sql-driver/mysql driver

I associate tags to articles with a table article_to_tag which associates an article ID with a tag ID, and find articles with certain tags using a Toxi solution found toward the bottom of this article

This snippet is supposed to query my database for all articles associated with all tags in the array itags