最近我开始学习Java技术,现在我对Servlet的工作,而我取从数据的基础上它没有解决结果集RS 这里我重视我的代码数据结果集RS不能得到解决
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<script
type="text/javascript" language="javascript">
javascript:window.history.forward(1);
</script>
<%
response.setHeader("Pragma","no-cache");
response.setHeader("Cache-Control","no-store");
response.setHeader("Expires","0");
response.setDateHeader("Expires",-1);
%>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="update.jsp">update</a>
<a href="delete.jsp">display</a>
<a href="logout.jsp">logout</a>
<script>
<%
try{
ResultSet rs=null;
String mail=(String)session.getAttribute("mail");
String sql="select * from tempregister where mail=?";
Class.forName("com.ibm.db2.DB2Driver");
Connection con=DriverManager.getConnection("jdbc:db2://localhost:50000/TEMP", "tarun", "12347890");
PreparedStatement ps=con.prepareStatement(sql);
ps.setString(1, mail);
rs=ps.executeQuery();
}catch(Exception e){
}
%>
<%
while(rs.next())
{
%>
<%=rs.getString(4)%>
<%
}
}
catch(Exception e)
{
e.printStackTrace();
}%>
</script>
</a>
</body>
</html>
请帮我..谢谢
请提供异常的'StackTrace'。 –
'rs'在'try'块内声明,所以当块结束时它不存在(超出范围),并且'while(rs.next())'在块之外,导致*编译*错误。 – Andreas
感谢您的回应sir ..先生后来我删除了try {}之后的catch块,即使数据没有被提取到html页面 –