Hibernate bitset



Keywords: hibernate bitset
Description: I am trying to map a normalized Java model to a legacy database schema using Hibernate 3.5. One particular table encodes a foreign keys in a one-to-many relationship as a bit array column. no

I am trying to map a normalized Java model to a legacy database schema using Hibernate 3.5. One particular table encodes a foreign keys in a one-to-many relationship as a bit array column.

  • no one is a member of Cricket --- no flags set
  • Bob/Sue -> Tennis --- flags at positions 1 and 3 are set
  • Bob/Sue/Joe -> Cooking --- flags at positions 1, 2 and 3 are set
  • Sue -> Golf --- flag at position 3 is set

Now, for this example a join table could've been used instead which would simplify matters and avoid many potential issues - e.g: the maximum range of members placing an upper bound on the number of people rows. However, I am stuck with this schema and it seems that there were factors in favour of using a bit array column way back when.

I am assuming that I must use a UserType implementation but have been unable to find any examples where the items described by the user type are references to entities - not literal field values - or composites thereof. Additionally I am aware that I'll have to consider how the person entities are fetched when a club instance is loaded.

I have recently had to revisit this type of mapping in a legacy database. This time around it became apparent that our equivalent of the members table was actually a static set and could be hardcoded as an Enum. With this simplification it was fairly straightforward to implement a Hibernate UserType that converted between the bit array and a set of enums.






Photogallery Hibernate bitset:


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