Persist custom class into database, custom serialization rules

Question

I have this class

public class Money {
   private BigDecimal amount;
   private String currency;
}

I would like, by creating a custom serializator or similar ways, to tell hibernate to persist the Money class as String in this way: 23.00 EUR

Basically the serialization will be amount rounded with 2 decimals + space + currency, and the deserialization will follow the inverse logic.

It shouldn't be difficult to implement, but I couldn't find hints. Any ideas how to do that?

Answer 1

Ready to go: AttributeConverter

import javax.persistence.AttributeConverter;


@Converter(autoApply = true)
public class MoneyAttributeConverter implements AttributeConverter<Money, String> {
    
    @Override
    public String convertToDatabaseColumn(Money in) {
        return ... convert here;
    }

    @Override
    public Money  convertToEntityAttribute(String in) {
        return ... and here;
    }
}

Hope helpul :)

EDIT. Note on the margin, serialisation is 'similar' to persistence, but not the same. Google in the net "differences between @Transient annotation and transient keyword"