Nested comments in PHP & MySQL

Question

I searched through the forums but couldn\'t get an authoritative answer. I want to implement a nested comment structure in a way like this:

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Answer 1

There are several different ways to store heirarchical data in MySQL. Check out Bill Karwin's presentation that demonstrates four options.

• Adjacency List
• Path Enumeration
• Nested Sets
• Closure Table

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You are using the adjacency list model for storing heirarchical data, but unfortunately this is the hardest model you could choose for querying subtrees.

Your options are:

• Change to a different model.
• Restrict queries to n levels deep.
• Use a stored procedure to query recursively. For more information about this, see Quassnoi's series of articles - Hierarchical queries in MySQL.