摘要：数据源 动态数据源 可参考 https://www.liaoxuefeng.com/article/00151054582348974482c20f7d8431ead5bc32b30354705000 自定义注解 指定target，方式@Target(java.lang.annotaion.Elem 阅读全文

摘要：三目运算： 为真时的结果 if 判断条件 else 为假时的结果（注意，没有冒号） json序列化：josn.dumps() json反序列化：json.loads() 多线程实现： thread: thread.start_new_thread(runTarget,(..)) threading: 阅读全文

摘要：download -> make -> redis-server ->redis-cli operations: 数值操作incr incrby; decr decrby; lists操作lpush rpush lrange 无序集合sadd smembers sismember sunion .. 阅读全文

摘要：# MongoDB AWS EC2 Setup Guide **Credits:** - [https://eladnava.com/deploy-a-highly-available-mongodb-replica-set-on-aws/](https://eladnava.com/deploy-a-highly-available-mongodb-replica-set-on-aws... 阅读全文

摘要：user: create user 'name'@'host' identified by 'passwd' grant usage/all privileges on *.* to 'name'@'host' identified by 'passwd' with max_queries_per_ 阅读全文