Question

I’m developing a Java project with JPA / Hibernate and SQL Server DB.

I got an existent db where date fields are stored as int and datetime as float.

Does anyone know how can I implement a transparent conversion to a Calendar type in my domain class?

I must calculate the date in getter and setter or there’s a better way?

Thank you!
Marco

Answer 1

I would do it as follows:

1. Two classes, MyDate & MyDateTime each implementing the Hibernate UserType interface.
2. MyDate will read the integer date as String, assuming the integer is of the format 20120828. In the nullSafeGet() implementation, it will convert this string to a Joda DateTime or Java.util.Date using the SimpleDateFormat class with format as “yyyyMMdd”.
3. MyDateTime will read the float as String, assuming the float is of the format 20120828.190800. In the nullSafeGet() implementation, it too will convert this string to a Joda Datetime or java.util.Date using the SimpleDateFormat class with format as “yyyyMMdd.HHmmss”.
4. The nullSafeSet() will format back the data using the same SimpleDateFormat in the respective classes.

Hope this helps.