JOOQ Timestamp precision on query

问题

I have this raw query for PSQL that I would like to transform to JOOQ query:

SELECT DISTINCT date_trunc('day', ref_date) AS refdate
FROM income
WHERE probos_id = :probosId

The best version I was able to create is:

Result<Record1<Timestamp>> result = createQueryBuilder()
    .selectDistinct(incomeTable.REF_DATE.cast(Date.class).cast(Timestamp.class).as("refdate"))
    .from(incomeTable)
    .where(incomeTable.PROBOS_ID.eq(probosId))
    .fetch();

This is the generated query:

select distinct 
cast(cast("public"."income"."ref_date" as date) as timestamp) as "refdate" 
from "public"."income"
where "public"."income"."probos_id" = ?

I'd like to find a better way for set the precision (like date_trunc in PSQL) to get the necessary value without doulbe casting.

If it's possible I'd like to find a native solution without extending the DSL.

Thanks!

回答1:

Use DSL.trunc(Field, DatePart), i.e.

Result<Record1<Timestamp>> result = createQueryBuilder()
    .selectDistinct(trunc(incomeTable.REF_DATE, DatePart.DAY).as("refdate"))
    .from(incomeTable)
    .where(incomeTable.PROBOS_ID.eq(probosId))
    .fetch();

来源：https://stackoverflow.com/questions/51681406/jooq-timestamp-precision-on-query