Mapping a FunctionalJava Option with Hibernate

Question

I have a hibernate-mapped Java object, JKL, which is full of a bunch of normal hibernate-mappable fields (like strings and integers).

I\'m added a new e

Answer 1

I would suggest introducing FunctionalJava's Option in the accessors (getter and setter), while leaving Hibernate to handle a simple java field which is allowed to be null.

For example, for an optional Integer field:

// SQL
CREATE TABLE `JKL` (
    `JKL_ID` INTEGER PRIMARY KEY,
    `MY_FIELD` INTEGER DEFAULT NULL
)

You can map a Hibernate private field directly:

// Java
@Column(nullable = true)
private Integer myField;

You could then introduce Option at the accessor boundary:

// Java
public fj.data.Option getMyField() {
    return fj.data.Option.fromNull(myField);
}

public void setMyField(fj.data.Option value) {
    myField = value.toNull();
}

Does that work for your needs?