null array mysqli_fetch_assoc ( mysqli_result $result ) void mysqli_free_result ( mysqli_result $result )

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null array mysqli_fetch_assoc ( mysqli_result $result ) void mysqli_free_result ( mysqli_result $result )

w取最大db_id. if($row=null){ var_dump(123); } var_dump($row); if($rowb=array('ww','w123')){ var_dump(234); } var_dump($rowb); $rowc=null; if($rowc=null){ var_dump(345); } var_dump($rowc); NULL int(234) array(2) { [0]=> string(2) "ww" …

A query was run and no Result Maps were found for the Mapped Statement 'user.insertUser!selectKey'. It's likely that neither a Result Type nor a Result Map was specified.

使用mybatis时出现异常问题: 有如下的错误 Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'user.insertUser!selectKey'. It's likely that neither a Result Type nor a Re…

request.getAttribute( "result");和request.setAttribute("result",username);

request.setAttribute("result",username);在request对象中加入名为result的属性并附值为username,因为request对象是可以更改的,你可以在同一个请求中象这样访问这个属性. 虽然类似session,但与session是有所区别的,request.setAttribute设置的属性只能在当前 request只使用,比如你在Action中设置result属性,需要到jsp页面中读取:request.setAttribute(&qu…

Tomcat报错：No result type specified for result named 'success'

今天学Struts, tomcat报出了异常信息 Exception starting filter [struts2] Unable to load configuration.还有 No result type specified for result named 'success', 找了很久终于在stackoverflow上找到了报错原因,在struts.xml的配置文件中需要加上 namespace="/"; 这样就不会报错了 <package name="p…

ExecutorException: A query was run and no Result Maps were found for the Mapped Statement ‘com.win.mall.dao.CartMapper.test’. It’s likely that neither a Result Type nor a Result Map was specified.

ExecutorException: A query was run and no Result Maps were found for the Mapped Statement 'com.win.mall.dao.CartMapper.test'. It's likely that neither a Result Type nor a Result Map was specified. 原因:mybatis没有resultMap报错在mapper文件的 select 标签中没有指定 res…