How to map a Map<Calendar,Boolean> with jpa/hibernate

i've got 2 tables:

Seat(roomID,seatID,...) SeatState(roomID,seatID,date,state)

i wa开发者_如何学Cnna create a seat class and i would like this class to have a Map attribute. does somebody know how to map this thing?

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Hibernate supports using 'Map's as collections. If you are using hbm.xml files, you can use the <map> tag for this purpose. Take a look at http://docs.jboss.org/hibernate/core/3.3/reference/en/html/collections.html for a reference. Also Hibernate supports mapping Calendar fields to TIMESTAMP fields.
So if you are using XML, it should be something like

<map name="booking" table="BOOKING">
    <key column="BOOKING_ID"/>
    <map-key column="BOOKING_DATE" type="calendar"/>
    <element column="IS_BOOKED" type="boolean"/>
 </map>

Likewise, JPA / Hibernate Annotation alternatives also exist. You need to use @Embeddable to get this done. See http://hwellmann.blogspot.com/2010/07/jpa-20-mapping-map.html for an example.