在创建JSP时提示The superclass "javax.servlet.http.HttpServlet" was notfound on the Java Build Path错误 错误: 在Eclipse中创建JSP时提示The superclass "javax.servlet.http.HttpServlet" was notfound on the Java Build Pat
文档中的解释:It returns TRUE if an INSERT, UPDATE, or DELETE statement affected no rows, or a SELECT INTO statement returned no rows. Otherwise, it returns FALSE. 这个解释更加精妙: %NOTFOUND is the logic
1. Problem 用一块新的Nvidia的 Jetson NX板编译时遇到一个报错,如下: CMake Error: The following variables are used in this project, but they are set to NOTFOUND.Please set them or make sure they are set and tested cor
一、前言 sql%notfound 是一个布尔值,与最接近的sql语句(update、insert、delete、select)发生交互,当最近的一条sql语句没有涉及到任何行的时候,返回true,否则返回false。 二、说明 这样的语句在实际应用中,是非常有用的。例如要update一行数据时,如果没有找到,就可以作相应操作。 beginupdate table_name set sal