sqlserver打了SP3补丁后，数据库可以连接上了，但出现了下面这个问题，急救！！ 在线等！！
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 4 in the jsp file: /sqlserver2.jsp
//注意看下面，我不知道是什么意思，求救各位
Generated servlet error:
conn cannot be resolved
An error occurred at line: 4 in the jsp file: /sqlserver2.jsp
Generated servlet error:
conn cannot be resolved
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 4 in the jsp file: /sqlserver2.jsp
Generated servlet error:
conn cannot be resolved
An error occurred at line: 4 in the jsp file: /sqlserver2.jsp
Generated servlet error:
conn cannot be resolved
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:413)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:297)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.16 logs.
//JSP代码如下：（刚开始用的是MS的JDBC的，出现这种问题，然后换了JTDS的，问题依旧）
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="java.sql.*" %>
<%
String url="jdbc:jtds:sqlserver://localhost:1433/aa";
String user="testuser";
String password="123456";
try{
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
out.print("加载驱动成功！<br>");
}
catch(Exception e)
{
out.print("加载驱动失败!<br>");
e.printStackTrace();
}
try
{
Connection conn=DriverManager.getConnection(url,user,password);
out.print("连接数据库成功!<br>");
}
catch(Exception e)
{
out.print("连接数据库失败!<br>");
e.printStackTrace();
}
////////////到这里为止都是可以运行通过的，下面开始就不行了///////////////////
Statement stat = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from mytable";
ResultSet rs = stat.executeQuery(sql);
//获得数据结果集合
ResultSetMetaData rmeta = rs.getMetaData();
//确定数据集的列数，亦字段数
int numColumns=rmeta.getColumnCount();
// 输出每一个数据值
out.print("姓名");
out.print("|");
out.print("学号");
out.print("<br>");
while(rs.next()) {
out.print(rs.getString(1)+" ");
out.print("|");
out.print(rs.getString(2));
out.print("<br>");
}
out.print("<br>");
out.print("数据库操作成功，恭喜你");
rs.close();
stat.close();
conn.close();
%>
问题点数：100、回复次数：2Top
1 楼interpb（曾曾胡，深怕情多累美人！）回复于 2006-05-03 18:37:51 得分 100
try
{
Connection conn=DriverManager.getConnection(url,user,password);
out.print("连接数据库成功!<br>");
}
/////////////
Connection conn = null ;
try
{
conn = DriverManager.getConnection(url,user,password);
out.print("连接数据库成功!<br>");
}
改成下面的 你的conn定义在try里面 对外面对象是不可见的
Top
2 楼chinabh（黑鹰）回复于 2006-05-03 19:37:11 得分 0
OK,看来基础知识真得很重要，谢谢大侠，结帖！Top
