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Asked: 2026-05-22T20:48:05+00:00

I am writing a small tool for training purposes. The main scope is to

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I am writing a small tool for training purposes.
The main scope is to understand how to work with persistent data without using ORM tools.
So, there is a small DB with tables:

users(id, login, password, group_id)
groups(id, name, description)
roles(id, name, description)
// for many-to-many relationship between groups and roles.
groupsroles(group_id, role_id)

So, I have implemented a DAO pattern, with 3 entities : User, Role, Group.
The question is : what is the best way to implement the work with relationships?
How to share the same connection between UserDAO, GroupDAO, RoleDAO to use DB transactions ?

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1 Answer

  1. Editorial Team

    It’s easy to let DAOs share a connection, because it should be created by a service layer, passed into each DAO object, and closed. Just pass the connection around.

    Another alternative would be to not share the connection between three DAOs. Rather than mke three queries, you could make one JOIN query, bring all the data back at once, and map it into objects. The penalty is more bytes on the wire, because you bring the parent data back for every child object.

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