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Running Lacuna PSC without db_owner privileges

Lacuna PSC can operate in two ways regarding the access to the database:

  1. Having owner privileges over the database and automatically updating the database model after an update when needed (default)
  2. Having only read and write privileges over the database, requiring the database model to be updated by the administrator using a command line tool

Granting owner privileges to the application is simpler, which is why this mode is the default for the standard installation. However, granting only read and write privileges ensures you greater control over the database. If you prefer to run Lacuna PSC without owner privileges over the database, follow the steps on this article.

Create unprivileged credentials

Create the database normally as specified on the Preparing a database article.

Then, instead of creating the PscAdm user and granting it the db_owner role, create a limited user PscApp and grant it only the roles db_datareader and db_datawriter:

USE master;
CREATE LOGIN PscApp WITH PASSWORD = 'XXXXXX';
GO

USE Psc;
CREATE USER PscApp FOR LOGIN PscApp;
EXEC sp_addrolemember 'db_datareader', 'PscApp';
EXEC sp_addrolemember 'db_datawriter', 'PscApp';
GO

The connection string would then be:

Data Source=.;Initial Catalog=Psc;User ID=PscApp;Password=XXXXX
Note

This connection string assumes the database server is installed on the same server as the web app. If this is not true, the value after Data Source= would have to be changed.

Disable automatic database update

Running Lacuna PSC without owner privileges means that the application cannot update the database model on its own. Thus, you should disable the automatic database model update to avoid errors.

Edit the Lacuna PSC JSON configuration file (depends on the platform you are using) and add:

  • Section General
    • AutoUpdateDatabase: set to false

See also