Graph cafe-lightning
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This document discusses representing dates and times in a Neo4j graph database to enable querying events that occur on specific dates or within a date range. It shows how dates can be modeled as nodes connected by relationships, and provides Cypher queries to find events on a single day, between two days, or check if an event occurs on a given date. Mixed property and relationship types are also discussed.
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Graph cafe-lightning
- 4. The problem with perspective is that it’s bidirectional http://xkcd.com/230/
- 5. representing dates/times (using neo4j 1.9.5)
- 6. representing dates/times root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01
- 7. find all events on a specific day START MATCH root=node(0) root-[:year_2013]-()-[:month_05]-()-[:day_24]-()- [:happens]-event RETURN event
- 8. representing dates/times root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01
- 9. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01
- 10. find all events for a given range START root=node(0) MATCH root-[:year_2013]-()-[:month_05]-()-[:day_24]-start, root-[:year_2013]-()-[:month_05]-()-[:day_26]-end, start-[:next*0..]-middle-[:next*0..]-end, middle-[:happens]-event RETURN event
- 11. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01
- 12. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01
- 13. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01
- 14. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01
- 15. find all events for a given range START root=node(0) MATCH root-[:year_2013]-()-[:month_05]-()-[:day_24]-start, root-[:year_2013]-()-[:month_05]-()-[:day_26]-end, start-[:next*0..]-middle-[:next*0..]-end, middle-[:happens]-event RETURN event
- 16. does an event happen on a certain date? START event=node(20) MATCH event-[:day_24]-()-[:month_05]-()-[:year_2013]-() RETURN event
- 17. does an event happen on a certain date? root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 (20) :happens Event 2 :happens :happens Event 3 :month_01 Month 01
- 18. property vs. relationship type constructing cypher queries execution plan cache vs. property load creating and deleting calendar graph
- 19. mixed property/relationship type START MATCH root=node(0) root-[:year_2013]-()-[:month_05]-()-[:day_24]-()- [:hour] - (hour_node) - [:happens]-event WHERE hour_node.hour = {hour} RETURN event
- 20. calendar creation START ref_node = node(0) CREATE UNIQUE ref_node - [:year_2013] -> [:month_11] -> [:day_27] -> [:hour] -> RETURN hour_node (year_node (month_node (day_node (hour_node {year: {month: {day: {hour: {year}}) {month}}) {day}}) {hour}}) - -
- 21. deleting calendar root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01
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