using DSL.max with custom field

[Jacob G]

I'm trying to write a select query using DSL.max on a custom field, i.e., a DSL.field constructed using jsonb, but I'm getting this error when running the following query (specific names obscured):

Field (cast("schema"."table"."field" #>> '{property}' AS schema.enum_type)) is not contained in Row (max(cast("schema"."table"."field" #>> '{property}' AS schema.enum_type)))

It looks like DSL.max requires that the field be a real column in the table, i.e., in the Record definition. Am I understand that correctly? Is there a way to do what I'm trying?

Thanks!

[Jacob G]

Never mind. I figured out the issue. DSL.max works fine, but I need to give the field a name (i.e.,g DSL.max(...).as("myfield"), and then reference that name in the fetchOne("myfield", String.class) call.

[Lukas Eder]

Hi Jacob,

Yes, that's one option. Another one is to pass the exact same reference to ResultQuery.fetchOne() or to Record.get(). e.g.

Field<?> max = DSL.max(...);

Object value =

DSL.using(configuration)

   .select(max)

   .from(...)

   .fetchOne(max);

You could even repeat the entire field expression, although that might be a bit tedious in your case:

Object value =

DSL.using(configuration)

   .select(DSL.max(...))

   .from(...)

   .fetchOne(DSL.max(...));

Hope this helps,

Lukas

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[Jacob G]

Thanks a lot Lukas. Yeah, I saw that works too, and prefer it over what I wrote in my last message.

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