i am using MySQL with PHP & Doctrine 2.
my question is assuming i am using Modified Preorder Tree Traversal is there a way i can retrieve only immediate children?
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i am using MySQL with PHP & Doctrine 2.
my question is assuming i am using Modified Preorder Tree Traversal is there a way i can retrieve only immediate children?
In addition to the lft and rgt values you could also store each child’s parent id. One advantage of doing this is that if your lft and rgt values get messed up you can regenerate the tree. It also lets you directly determine the immediate children of a parent node.