How do you create a DynamicQuery that is able to access all the n- to m tables that Liferay offers ?
Tables like Users_Orgs or Users_Roles ? Normally you would have to retrieve the User and then retrieve the Orgs by calling a method on that user that uses a Finder which has some custom sql and ... well: it´s not very performant. You have to do it for every individual user, you´re out of your DynamicQuery and your application gets slower.
You could write some custom sql, or you might do the follwing:
Use the Liferay Service Builder to access the tables, Liferay hides from you.
Create a new service.xml or add the following to an already existing one :
<entity name="Users_Orgs" local-service="true" remote-service="false">
<column name="userId" type="long" primary="true" />
<column name="organizationId" type="long" />
Your name has to match the table you want to access. Then generate your service, and Liferay creates a Users_Orgs class for you. This you can use to access the no-longer hidden table by a DynamicQuery:
DynamicQuery blogsQuery = DynamicQueryFactoryUtil.forClass( Users_Orgs.class, PortalClassLoaderUtil.getClassLoader());
On the downside I have to say that there is a reason, that those tables aren´t accessible. So if I were you I´d remove all methods from the newly created Service that writes to that table.
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If you have any questions, feel free to leave a comment.