How to manage user/permissions in an environment web/PL/SQL correctly?

My team will develop an internal (known users) application that has an architecture based on Java as front-end and PL/SQL as back-end. So, currently we are thinking in a better solution to manage the user/permissions, and we have two options:

1. Each user has their own database account, granted with the permissions. Currently the legacy system use this approach and I don't like it because it manages permissions based on database objects' granularity. So, I believe it is a bad choice to have a database connection per user. Can you see more cons here?

2. Build some tables at database to store the users and theirs permissions/profiles and build a PL/SQL procedure to do the login, generating a token and include a parameter to all others PL/SQL to verify this token and then authorize (or not) the execution.

So, you can ask me: why not just manage your permissions in your web-applicatio开发者_运维技巧n? Answer: Those PL/SQL are already done and are used by all legacy systems, and this web-application should behave according it (ie. User permissions should be managed by the PL/SQL and its granularity based in please.)

How do you proceed in this case?

I think using the database's built-in mechanism is always to be preferred over rolling our own. And that applies to logging in users as much as anything else.

The biggest single advantage of dedicated user accounts is that we can link a given session with a named user. Well, yes, duh. But the point is, doing thinks like auditing user activity or tracing a performance issue in some process is way more difficult in web applications with generic accounts.

To address your main objection, we don't have to manage database privileges at the user level. That's why we have roles. For normal users, a role will provide sufficient privileges.

So:

1. define a set of roles which match the various business jobs your application serves.
2. grant system and object permissions to those roles; remember that roles can be additive (i.e. we can grant privileges on a role to another role).
3. grant roles to the users.

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