I MySQL 1. mapper.xml <if test="queryParams.beginTime!= null and queryParams.beginTime.trim() neq ''"> and date_format(create_time,'%Y-%m-%d %H:%i:%s') >= date_format(#{qu...

In the past, every Halloween github would change its color scheme. Today, it was discovered that so recorded the extraordinary egg of github in 2020, hoping that everything would gradually improve.

There are many types and implementation methods of inheritance in JavaScript in many books. Generally, there are two types: class inheritance (object impersonation) and prototype inheritance. Class inheritance (object impersonation): a method that defines its own properties inside a function. When subclasses inherit, call or apply