Question

I have two tables with a FK relation. What I want is equivalent to:

select A.*, B.*
from A
join B
    on B.A_ID = A.ID

How do I do this efficiently in jOOQ? In the end, I need one instance of ARecord and one of BRecord per resulting row.

Answer 1

Like this

Result<Record> result =
create.select()
      .from(A)
      .join(B).on(B.A_ID.equal(A.ID))
      .fetch();

This will fetch A.*, B.* (or more precisely, A.A1, A.A2, ..., A.AN, B.B1, ...). Now in order to transform result into ARecord and BRecord use the Result.into(Table) method:

ARecord a = result.into(A);
BRecord b = result.into(B);

Note, that this has known flaws. For instance, if A.X is a field that has a corresponding field B.X (same field name), A.X will hold B.X‘s value. I have registered a bug report for this: #1802