Lukas Eder • 5/9/2022

How to Typesafely Map a Nested SQL Collection into a Nested Java Map with jOOQ

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This technical article demonstrates how to use jOOQ, a Java database library, to execute a single SQL query that fetches a nested collection and maps it into a type-safe Java Map. Using the Sakila database example, it shows how to transform film revenue data (date and amount) from a ResultSet into a Map<LocalDate, BigDecimal> within a Java record, leveraging jOOQ 3.15's ad-hoc conversion API and the MULTISET operator for compile-time type safety.

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#type safety #Jooq #Multiset

How to Typesafely Map a Nested SQL Collection into a Nested Java Map with jOOQ

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