PostgreSQL

Configure PostgreSQL databases

PostgreSQL is optional and can be replaced by SQL Server instead. By default the repository is configured to run using SQL Server. In case you want to use SQL Server read SQL Server

Harmony has an dependency to PostgreSQL databases which can be installed on Windows or Linux. After installing an PostgreSQL instance, proceed by creating the required databases and configuring the connection strings for the following three databases:

1. Harmony: The core database used by the Harmony.Api server app, containing all the core tables and their relationships, e.g. Workspaces, Boards or Cards.

2. Harmony.Notifications.Jobs: The database used by the Harmony.Notifications web app, containing all the HangFire required tables and one more.

3. Harmony.Automations.Jobs: The database used by the Harmony.Automations web app, containing all the HangFire required tables and one more.

Harmony database configuration

Database connection string

Configure the HarmonyConnection PostgreSQL connection string existing in the appsettings.json file at the root of the Harmony.Api project to point to your PostgreSQL instance. By default it tries to connect to a local PostgreSQL instance. Change the connection string to match your environment.

  "DatabaseProvider": "PostgreSQL",
  "ConnectionStrings": { 
     "HarmonyConnection": "Host=localhost;Database=Harmony;Username=postgres;Password=MySecretPassword"
  }

Database migrations

Since Harmony can be run either using SQL Server or PostgreSQL, there are two separate class library projects for the respective migrations:

• Harmony.Persistence.Migrations.SqlServer

• Harmony.Persistence.Migrations.PostgreSql

In case you want to contribute and you want to add a new migration, you need to create the migration for both database providers. There are detailed instructions on how to apply or add migrations for each provider in the respective guides.

You can run the database migrations either manually or let the projects run them for you during startup.

Run migrations through Visual Studio

When running migrations through Visual Studio, open the Package Manager Console and set the Default project to src\Infrastructure\Harmony.Persistence. This should be the default project when running other migrations as well (NotificationContext & AutomationContext examples following)

Run the following command to create the database:

Update-Database -Context HarmonyContext -StartUpProject Harmony.Api

Run update migration for Harmony database

Migrations command require that you have previously setup your database connection strings properly.

In case you decide to create a new migration, follow the same procedure by replacing the command with the following:

Add-Migration MyCustomMigrationName -OutputDir HarmonyContextMigrations -Context HarmonyContext -Project Harmony.Persistence.Migrations.SqlServer -StartUpProject Harmony.Api

Run migrations using a command line

You can run database migrations from a command line as well. First you need to have installed EF Core tools.

dotnet tool install --global dotnet-ef

In case you had previously installed a dotnet-ef version other than the latest, update it by running the following command: dotnet tool install --global dotnet-ef

1. Open a terminal and navigate at the root of the Harmony.Persistence project, where the HarmonyContext database context class exists.

2. Run the dotnet ef command to create the database

dotnet ef database update --context HarmonyContext --startup-project "../../Services/Harmony.Api/Harmony.Api.csproj" -- --DatabaseProvider SqlServer

In case you have installed a local SQL Server on a Linux machine accepting a Developer license, you need to add Encrypt=False; at the end of your connection string before running migration commands, otherwise you will get an error. Also keep in mind that for Linux SQL Server installations your connection string should use username and password rather than windows authentication. Harmony has been tested successfully ✅ on Windows and an Ubuntu 22.04 machine. SQL Server for Ubuntu was installed following this guide.

Create database migration through command line

Just a reminder here: It's optional to run the migrations by yourself because they run by default at startup in debug mode.

To disable the automatic migrations remove the following line from the ApplicationBuilderExtensions class.

harmonyContext.Database.Migrate();

Harmony.Notifications & Harmony.Automations jobs database configuration

Database connection string

Configure the SQL Server's HarmonyJobsConnection connection strings existing in the appsettings.json file at the root of the Harmony.Notifications & Harmony.Automations projects to point to your SQL Server instance.

Harmony.Notifications appsettings.json

  "DatabaseProvider": "SqlServer",
  "ConnectionStrings": {
    "HarmonyJobsConnection": "Server=.;Database=Harmony.Notifications.Jobs;Integrated Security=True;TrustServerCertificate=True"
  },

Harmony.Automations appsettings.json

  "DatabaseProvider": "SqlServer",
  "ConnectionStrings": {
    "HarmonyJobsConnection": "Server=.;Database=Harmony.Automations.Jobs;Integrated Security=True;TrustServerCertificate=True"
  },

Database migrations

Use the same process & commands you used for Harmony database and Harmony.Api projects except that you have to change the following two parameters:

• -Context: NotificationContext or AutomationContext

• -StartUpProject: Harmony.Notifications or Harmony.Automations

Applying migrations via dotnet-ef tools:

dotnet ef database update --context NotificationContext --startup-project "../../Services/Harmony.Notifications/Harmony.Notifications.csproj" -- --DatabaseProvider SqlServer

dotnet ef database update --context AutomationContext --startup-project "../../Services/Harmony.Automations/Harmony.Automations.csproj" -- --DatabaseProvider SqlServer

Applying migrations using Visual Studio package manager console:

Update-Database -Context NotificationContext -StartUpProject Harmony.Notifications

Update-Database -Context AutomationContext -StartUpProject Harmony.Automations

Read next - configure the MongoDB Server