我需要在Java中装饰一个实例,并希望委托在Kotlin中(更容易)。如何定义inner才能接收null?open class ConnectionDecorator(var inner: Connection?): Connection by inner // Getting an error on the right innernew ConnectionDecorator(null
我只是想了解一下Joins的用法,并找出查询的最佳用法和公式。尝试为主人获取所有宠物-我是否调用带有比较的联接?SELECT *INNER JOIN OWNER ON VISITOR.OWNER_ID = 1或者,我应该调用完整连接并添加WHERE语句吗SELECT *INNER JOIN OWNER ON VISITOR.OWNER_ID = OWNER.ID
WHERE VI
假设我有两个ServiceComponent类,我的用法如下:{ using (var inner = new MyComponent2()) data = inner.GetFromQueue();
outer.Process(dataMyComponent2是在被释放时提交,还是等待MyComponent1启动的事务