[英]Rails logs. what does this mean
我在开发日志中得到了这个。 mCACHE线是什么意思? 他们是SQL查询吗?
←[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
这就是Rails SQL Caching工作的证据:
http://guides.rubyonrails.org/caching_with_rails.html#sql-caching
缓存意味着您已经运行了相同的查询,并且其结果存储在内存中,因此查询实际上不是针对数据库运行的。 它们都是查询,它是Active Record在与数据库通信时实际执行的操作。
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