jooq从表的特定分区中选择

Question

What is the right way to execute a select query on a particular partition of a table. For exmample I have a employees table that is range partitioned on a particular column.

Currently I do:

Result<Record> fetch = DSL.using(configuration())
  .select()
  .from(EMPLOYEES)
  .fetch();

what is the right way to execute the below sql (where p2 is a partition)

SELECT * FROM employees PARTITION (p2);

UPDATE 1 What about for update/insert when I am using Updatable record, example:

employeeRecord.attach(configuration())
employeeRecord.update(); // or insert

I assume I can do something like this but would that then handle optimistic lock case (which I am using via the version column on my table)

DSL.using(configuration())
                    .update("{0} partition (p2)", EMPLOYEES)
                    .set(EMPLOYEES.NAME, "abc")
                    .where(EMPLOYEES.ID.eq(123))
                    .execute();

Answer 1

jOOQ currently doesn't support PARTITION clauses on tables. The relevant feature request is: https://github.com/jOOQ/jOOQ/issues/2774

You can easily work around this limitation by using the plain SQL templating API: https://www.jooq.org/doc/latest/manual/sql-building/plain-sql-templating

Result<Record> fetch = DSL.using(configuration())
  .select()
  .from("{0} partition (p2)", EMPLOYEES)
  .fetch();

The above is convenience for:

Result<Record> fetch = DSL.using(configuration())
  .select()
  .from(DSL.table("{0} partition (p2)", EMPLOYEES))
  .fetch();

Answer 2

Did you try going with examples from here, like

create.select(t.BOOKED_AT, t.AMOUNT,
         sum(t.AMOUNT).over().partitionByOne()
                      .orderBy(t.BOOKED_AT)

https://www.jooq.org/doc/3.0/manual/sql-building/column-expressions/window-functions/