SSM错误集锦

        吃一堑长一智，然而我却经常在开发的途中犯了错，总是没去做好笔记，以至于总是遇到似曾相识的bug，以后不能再这样啦~~，一定要去记点东西啊，不然没个技术blog面试是没有优势的！

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.permission.dao.SysDeptMapper.countByNameAndParentIdorg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)javax.servlet.http.HttpServlet.service(HttpServlet.java:622)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)javax.servlet.http.HttpServlet.service(HttpServlet.java:729)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

解决方案：https://blog.csdn.net/oMrLeft123/article/details/70239951，这是转载啊~~~~~，是这样声明吗？  这个可以解决一般错误了，然而我的错误是这样的：

        是的！mapperLocations被注释掉了···  貌似是最开始建项目的时候运行单元测试会报错，就想先暂时隐藏一下，然后后来正式玩的时候就GG了······  看来TODO的事情一定要少做····

        然而 Exeception永远不是单打独斗的，终于跑了起来，又来了新伙伴：

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.permission.dao.SysDeptMapper.map
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

幸好这个给了我一个具体的路径，然后去该mapper文件下找到了····

改成如下，将parameterMap改成parameterType即可：

原因如下：https://blog.csdn.net/a672489861/article/details/22897451，这是转载啊~~~~~，是这样声明吗？

紧接着，在执行一次批量更新的时候，又遇到这样的问题，come on``````````````

 
HTTP Status 500 - Request processing failed; nested exception is org.springframework.jdbc.UncategorizedSQLException: 
type Exception report
message Request processing failed; nested exception is org.springframework.jdbc.UncategorizedSQLException: 
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.UncategorizedSQLException: 
### Error updating database.  Cause: java.sql.SQLException: sql injection violation, multi-statement not allow : UPDATE sys_dept
            SET level = ?
            WHERE id = ?
         ; 
            UPDATE sys_dept
            SET level = ?
            WHERE id = ?
         ; 
            UPDATE sys_dept
            SET level = ?
            WHERE id = ?
         ; 
            UPDATE sys_dept
            SET level = ?
            WHERE id = ?
### SQL: UPDATE sys_dept             SET level = ?             WHERE id = ?          ;              UPDATE sys_dept             SET level = ?             WHERE id = ?          
查了下，由于连接数据库用的是druid，这是由于没有设置multiStatementAllow所致，解决方案如下：
https://blog.csdn.net/goldenfish1919/article/details/50600053，这是转载啊~~~~~,是这样声明吗？

我这边是直接加到数据库连接字符串后面了。


唉 ，暂时就是这两个， 待续吧~~~~~~