Saving tree-structures in Databases
- by Nina Null
Hello everyone.
I use Hibernate/Spring and a MySQL Database for my data management.
Currently I display a tree-structure in a JTable. A tree can have several branches, in turn a branch can have several branches (up to nine levels) again, or having leaves. Lately I have performanceproblemes, as soon as I want to create new branches on deeper levels.
At this time a branch has a foreign key to its parent. The domainobject has access to its parent by calling getParent(), which returns the parent-branch. The deeper the level, the longer it takes to create a new branch.
Microbenchmark results for creating a new branch are like:
Level 1: 32 ms.
Level 3: 80 ms.
Level 9: 232 ms.
Obviously the level (which means the number of parents) is responsible for this. So I wanted to ask, if there are any appendages to work around this kind of problem. I don’t understand why Hibernate needs to know about the whole object tree (all parents until the root) while creating a new branch. But as far as I know this can be the only reason for the delay while creating a new branch, because a branch doesn’t have any other relations to any other objects.
I would be very thankful for any workarounds or suggestions.
greets,
jambusa
