请问我这个到底错在哪里?老是提示这里出错.

Question

<% if(numb1.getString(5).compareTo("")!=0)
          {
              out.print(numb1.getString(5));
          }
%>

Answer 1

<% if(numb1.getString(5).compareTo("")!=0)
          {
              out.print(numb1.getString(5));
          }
%>
z这是什么东西呀！
要判断num1!=null{}

Answer 2

<% if(numb1!=null && numb1.getString(5).compareTo("")!=0)
          {
              out.print(numb1.getString(5));
          }
%>

Answer 3

语法上没错的
你想表达一个什么意思呢？
如果获取的结果不为空就输出吗？
<% if(numb1.getString(5).compareTo(null)!=0)
          {
              out.print(numb1.getString(5));
          }
%>这样子试试

Answer 4

取数据库里面一个字段的内容,改成<%= numb1.getString(5)%>这个就对了.为什么下面那个不对?
org.apache.jasper.JasperException: Exception in JSP: /show.jsp:199196:           <td width="33%">
197:           <% if(numb1.getString(5).compareTo("")!=0)
198:           {
199:               out.print(numb1.getString(5));
200:           }%></td>
201:           <td width="9%"><div align="right">Q Q：</div></td>
202:           <td width="19%"><%=getStr(numb1.getString(6))%></td>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:467)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:371)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause javax.servlet.ServletException: No data found
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:846)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.show_jsp._jspService(show_jsp.java:359)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause java.sql.SQLException: No data found
sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7139)
sun.jdbc.odbc.JdbcOdbc.SQLGetDataString(JdbcOdbc.java:3908)
sun.jdbc.odbc.JdbcOdbcResultSet.getDataString(JdbcOdbcResultSet.java:5699)
sun.jdbc.odbc.JdbcOdbcResultSet.getString(JdbcOdbcResultSet.java:353)
org.apache.jsp.show_jsp._jspService(show_jsp.java:264)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)