在 ASP .Net Core 3.0 中使用 Heroku PostgreSql

Question

I have got my web api application deployed on Heroku, which should remember and operate (increment/decrement) certain numbers. I thought it will be a good idea to keep those numbers in database. Since this is my hobby project, I chose to connect Heroku PosgreSql add-on with free plan to my app. So here is the question: how exactly do I connect my app to this database? I have seen a lot of tutorials, but each toturial was either too overloaded with code (and little explanations to it), or described connection to local PostgreSql database (which is not what I need). I haven't do anything to this add-on except adding it to my app on app page.

Here is my Startup.cs (ConfigureServices method). ConnectionString, which I got from Postgre add-on, is located in appsettings.json.

Here is DatabaseContext.cs.

DbService class contains methods for work with database (create new entry, edit existing, delete, etc).

I am new to web-api and databases, so I'm sorry if this question is dumb.

Answer 1

Heroku provide DATABASE_URL environment variable with connection to PostgreSQL. You need to transform provided url to efcore format $"Server={pgHost};Port={pgPort};User Id={pgUserId};Password={pgPassword};Database={pgDatabase}"; .

Please check this topic for more info and examples https://github.com/jincod/dotnetcore-buildpack/issues/33