使用myBatis调用存储过程的返回值,提示错误信息: org.apache.ibatis.binding.BindingException: Mapper method 'com.xxxx.other.dao.MyDao.getNo attempted to return null from a method with a primitive return type (int). 先查mysql监控语句,发现存储过程调用正常,也得到了返回值,继续查 对应的文件 存储过程: CREATE PRO
序言 如果我们在 Objective C 中向一个对象发送它无法处理的消息,会出现什么情况呢?根据前文<深入浅出Cocoa之消息>的介绍,我们知道发送消息是通过 objc_send(id, SEL, ...) 来实现的,它会首先在对象的类对象的 cache,method list 以及父类对象的 cache, method list 中依次查找 SEL 对应的 IMP:如果没有找到且实现了动态方法决议机制就会进行决议,如果没有实现动态方法决议机制或决议失败且实现了消息转发机制就会进入消息转发流
In OpenCv, it only provide the function fitEllipse to fit Ellipse, but doesn't provide function to fit circle, so i read some paper, and write a function to do it. The paper it refer to is "A Few Methods for Fitting Circles to Data". Also when t
使用METHOD宏的函数定义: METHOD(message_t, get_message_id, uint32_t, private_message_t *this) { return this->message_id; } METHOD宏的定义: /** * Method declaration/definition macro, providing private and public interface. * * Defines a method name with this as fi