Design Pattern - CQRS

CQRS

ref:
http://johnnycoder.com/blog/2009/12/18/learn-domain-driven-design/
http://www.codeproject.com/Articles/555855/Introduction-to-CQRS

通常進行CRUD會有二個問題
collaboration 同時操作相同資料時
staleness 某筆資料, 當A查詢後, B修改

主要是想把二者責任分離
Command
Query

image source : http://www.udidahan.com/2009/12/09/clarified-cqrs/


image source : http://www.codeproject.com/Articles/555855/Introduction-to-CQRS



image source : http://msdn.microsoft.com/en-us/library/jj591573.aspx