鉴于以下类位于两个单独的头文件中并且可以以任何顺序出现://TestB.hclassTestB;//Forwarddeclarationforalateroperator=inacentralisedheaderclassTestA{constTestA&operator=(constTestB);//definedinTest.h};和://TestA.hclassTestA;//Forwarddeclarationforalateroperator=inacentralisedheaerclassTestB{constTestB&operator=(constTestA);//de

我创建了一个表格如下:mysql>createtabletesta(aint,bint,creal);QueryOK,0rowsaffected(0.14sec)但是当我想实现这样的触发器时，我遇到了一些语法错误:mysql>createtriggertesta_trigbeforeinsertONtestaFOREACHROWWHEN(NEW.c>100)BEGINPrint"Warning:c>100!"END;ERROR1064(42000):YouhaveanerrorinyourSQLsyntax;checkthemanualthatcorrespondstoyourMySQ