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3.2. 1 The MySQL event scheduler event_scheduler is responsible for invoking events and is turned off by default. This scheduler constantly monitors whether an event is to be called. To create an event, the scheduler must be turned on.The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.Li Qiang watched the operation of the assembly workshop of COMAC through real-time video. Photograph by Chen ZhengbaoCenters around a three-way romantic relationship involving a suburban married couple.Printed board3. Take your above three certificates plus graduation certificate, ID card and physical examination, and you can sign up for the lecture-that is, "lecture".1. OrderType (Recharge Type), if the value is 1, it means the user who recharged 500 yuan, if it is 2, it means the user who recharged 200 yuan, and if it is 3, it means the user who did not recharge.