ODBC驱动程序管理器无效的游标状态

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我是靠谱客的博主神勇方盒，最近开发中收集的这篇文章主要介绍ODBC驱动程序管理器无效的游标状态，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

我用的tomcat 7.0,eclipse 8.5,已经把class12.jar放到tomcat的lib目录下，oracle是9.2,表login的列we和ss都是varchar2(10)类型。在执行下列代码时：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:bksfhcxt";
String user="system";
String password="oracle2";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt = conn.createStatement();
String sql="select * from LOGIN";
ResultSet rs=stmt.executeQuery(sql);
if (rs !=null){out.println("rs.getString(3)");}
rs.close();
stmt.close();
conn.close();
%>
</body>
</html>

页面能正确显示 rs.getString(3) 字符出来，

但在执行下面语句时：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<html>
<body>
<%Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:bksfhcxt";
String user="system";
String password="oracle2";
Connection conn= DriverManager.getConnection(url,user,password);
Statement stmt = conn.createStatement();
String sql="select * from LOGIN";
ResultSet rs=stmt.executeQuery(sql);
//if (rs !=null){out.println("rs.getString(3)");}
while(rs.next()){%>
<%=rs.getString(1)%>
<%=rs.getString(2)%>
<%}%>
<table>
<tr>
<td>员工号</td>
<td>姓名</td>
</tr>
<tr>
<td><%=rs.getString(1)%></td>
<td><%=rs.getString(2)%></td>

</tr>
</table>
<%rs.close();
stmt.close();
conn.close();
%>
</body>
</html>

则报以下错误：

type Exception report

message An exception occurred processing JSP page /index.jsp at line 24

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 24

21: <td>濮撳悕</td>
22: </tr>
23: <tr>
24: <td><%=rs.getString(1)%></td>
25: <td><%=rs.getString(2)%></td>
26:
27: </tr>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

root cause
javax.servlet.ServletException: java.sql.SQLException: [Microsoft][ODBC 驱动程序管理器] 无效的游标状态
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
org.apache.jsp.index_jsp._jspService(index_jsp.java:116)

原因比较简单，我之前的代码是：
while(rs.next()){%>
<%=rs.getString(1)%>
<%=rs.getString(2)%>
<%}%>
while循环这里必然已经把数据集遍历完毕了，也就是游标走到了最后一行的后面（EOF行）。

然后我又想：
<td><%=rs.getString(1)%></td>
<td><%=rs.getString(2)%></td>
必然错误。

应该是把逻辑搞错了，应该是：

String sql="select * from LOGIN";
ResultSet rs=stmt.executeQuery(sql);
%>
<table>
<tr>
<td>员工号</td>
<td>姓名</td>
</tr>
<% while(rs.next()){ %>
<tr>
<td><%=rs.getString(1)%></td>
<td><%=rs.getString(2)%></td>
</tr>
<% } %>
</table>
<%
rs.close();
stmt.close();
conn.close();
%>
</body>
</html>