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Hibernate version: 3.1

I am trying to map tables such as these. Any hints on how this would map for select, update and delete

Table User:

userid (PK)
username
...

Table Relation

personId
connectionId
connectionDate
personId refers to User(userid)
connectionId refers to User(userId)
PK(personId,connectionId)


Table Invitation

inviterId
inviteeId
invitationDate
expiryDate
inviterId refers to User(userid)
inviteeId refers to User(userId)
PK(inviterId,inviteeId)

Have a look at section 23.3 of the refdocs. Your tables are like the LineItem table in that example, except with dates instead of the "quantity" property that the example uses.