Rails日志。 這是什么意思

Question

我在開發日志中得到了這個。 mCACHE線是什么意思？ 他們是SQL查詢嗎？

 ←[1m←[36mTodo Load (1.0ms)←[0m  ←[1mSELECT "todos".* FROM "todos" WHERE ("todos".project_id IN (4,5,6,7,8,9,10,11,12,13))←[0m
 ←[1m←[35mLog Load (1.0ms)←[0m  SELECT "logs".* FROM "logs" WHERE ("logs".todo_id IN (134,135,136))
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "users".* FROM "users" WHERE ("users"."id" = 3) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "users".* FROM "users" WHERE ("users"."id" = 3) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "users".* FROM "users" WHERE ("users"."id" = 3) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m
 ←[1m←[35mCACHE (0.0ms)←[0m  SELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1
 ←[1m←[36mCACHE (0.0ms)←[0m  ←[1mSELECT "firms".* FROM "firms" WHERE ("firms"."id" = 2) LIMIT 1←[0m

Answer 1

[numberm只是ANSI顏色代碼 - 它應該在智能終端中顯示漂亮的顏色，否則看起來很糟糕。

該CACHE是“一個SQL查詢，緩存（先前執行的，現在從緩存中加載）” -例如參見本

Answer 2

這就是Rails SQL Caching工作的證據：

http://guides.rubyonrails.org/caching_with_rails.html#sql-caching

Answer 3

緩存意味着您已經運行了相同的查詢，並且其結果存儲在內存中，因此查詢實際上不是針對數據庫運行的。 它們都是查詢，它是Active Record在與數據庫通信時實際執行的操作。