CASE Expression in JOOQ

Saeed D. :

How do I write the following SQL in JOOQ?

SELECT COUNT(*) as total, 
       SUM(CASE WHEN (in_kind OR goods) THEN 1 ELSE 0 END) AS alt_donation
FROM donation

All the three columns (‘not_found’, ‘in_kind’ and ‘goods’) are boolean.

I have looked at other related questions and JOOQ CASE Documentation and can make the following sql work in JOOQ.

SELECT COUNT(*) AS total, 
       SUM(CASE WHEN (not_found) THEN 0 ELSE 1 END) AS alt_donation
FROM donation

The JOOQ version runs correctly for this example:

val query = dslContext
    .select(DSL.count().`as`("donations"),
            DSL.sum(DSL.choose(DONATION.NOT_FOUND).`when`(true, 0).otherwise(1)).`as`("altdonation"))
    .from(DONATION)

I need to use the earlier sql statement that uses an 'or' in CASE.

Lukas Eder :

You could probably use the FILTER (WHERE ..) clause, which is supported by jOOQ and emulated in SQL dialects that don't natively support it, in a similar way as yours:

In SQL

SELECT COUNT(*) as total, 
       COUNT(*) FILTER (WHERE in_kind OR goods) AS alt_donation
FROM donation

In jOOQ

ctx.select(count().`as`("donations"),
           count().filterWhere(condition(DONATION.IN_KIND)
                           .or(condition(DONATION.GOODS))).`as`("alt_donation"))
   .from(DONATION)
   .fetch();

Notice I'm turning a Field<Boolean> into a Condition using DSL.condition(Field<Boolean>), which is probably the API you were looking for