JOOQ 中的 Fetch 子句

Question

I'm trying to get value LEGAL_ENTITY_ID (Integer) from table for to use later.

 public static int fetchingLegalEntityId() {
    return DSL.using(connection).select(LEGAL_ENTITIES.LEGAL_ENTITY_ID)
            .from(LEGAL_ENTITIES)
            .where(LEGAL_ENTITIES.CODE.eq("someValue"))
            .fetchOne();      
}

but I have incompatible types. What I need to do?

Answer 1

ResultQuery.fetchOne() produces a Record . There are many many ways to fetch data in jOOQ .

I could recommend various options, including:

• fetchOptional().map(Record::value1).orElseThrow(...)
• fetchOne(LEGAL_ENTITIES.LEGAL_ENTITY_ID)
• DSLContext.fetchValue(select)
• And many more

There isn't a best way to do such a query. Just explore the jOOQ API (eg by using an IDE and auto-completing your fetch() call to see what's available), and pick the style you prefer.