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So, how DO you persist hierarchical Data? We discuss two common solutions to this age-old problem: Adjacency Lists and Nested Set Models. Also, Build Atlanta, technical problems, multi-monitor vs ultra-wide, and utilizing gaming mice to up your game.
See all the notes and take the poll by going to:
- Big thanks for the reviews! devup_sam, CordonWebGuy, Ed__B, Kricorn2, Kenneth Glish, oly724, Mrfirley, Mbermanpga
- //build/Atlanta No HoloLens, but at least there were whale sharks!
- Awesome alligator joke, investiGATOR…get it!?
- Michael continues to disappoint us about Resharper
- Coding against a deadline – all good programming sense goes out the window!
Oh yes…and don’t forget to take the poll!
VIA @theallenu Worst part about coding under a tight deadline is you throw good programming sense out the window. AKA #Technicaldebt
— CodingBlocks.net (@CodingBlocks) June 1, 2015
Every record knows it’s immediate parent
- Simple, easy to understand schema
- Easy to query for children
- Referential integrity
- Easy to update
- Deep trees cause problems
- Difficult to query subtree
- Performance issues
Nested Set Model
Each node keeps track of it’s position in a tree in order to facilitate fast querying.
“Clothing-hierarchy-traversal-2” by Clothing-hierarchy-traversal.svg: Rp22
derivative work: Zygmuntjr (talk) – Clothing-hierarchy-traversal.svg. Licensed under CC BY-SA 3.0 via Wikimedia Commons.
- Fast to query
- Mo’ complicated
- Expensive to update/delete/move
- No referential integrity
- Transactional systems difficult to update
Resources We Like
- Models for Hierarchical Data
- SQL for Smarties by Joe Celko
- Stack Overflow
- That article Allen wrote that Joe thought started this discussion.
- Ultrawide vs Multi-Monitor setups: you decide.
- The LG 34UM95 is the monitor of choice for Allen
LG 34UM95 on Amazon
Tip of the Week
- Big-O Cheat Sheet
- Unlock productivity in Visual Studio with a Gaming Mouse!
- Cube viewing in Visual Studio
- Talked about two common ways of storing hierarchical data in a relational system: Adjacency Model and Nested Sets
- Stay tuned for more!
- Let us know what you think about some shorter episodes
- Allen’s blog post, the post that kicked this all off!