怎么回事儿？

[friendyou]

<%
String housemaster=request.getParameter("housemaster");
String sqlselect="select * from tenement where housemaster like +'"+housemaster+"'";
try{
ResultSet rs=mydb.executeQuery(sqlselect);
rs.next();
String tenementno=new String(rs.getBytes("tenementno"));
}catch(Exception ex){out.println(ex.toString());}
%>
<form name="tenementform" method="post" action="tenementreedit.jsp" onSubmit="return Check()">
<table width="63%" height="330" border="2" align="center">
<tr>
<td width="33%" height="23"><div align="center">住户编号:</div></td>
<td width="67%" height="23"><div align="center"><input type="text" name="tenementno" value=<%=tenementno%>>*</div></td>
</tr>
</table>
</form>
结果却显是没有定义tenementno,为什么？

[希偌]

变量定义的范围问题，改如下：
<%
String housemaster=request.getParameter("housemaster");
String tenementno="";
String sqlselect="select * from tenement where housemaster like +'"+housemaster+"'";
try{
ResultSet rs=mydb.executeQuery(sqlselect);
rs.next();
tenementno=new String(rs.getBytes("tenementno"));
}catch(Exception ex){out.println(ex.toString());}
%>
<form name="tenementform" method="post" action="tenementreedit.jsp" onSubmit="return Check()">
<table width="63%" height="330" border="2" align="center">
<tr>
<td width="33%" height="23"><div align="center">住户编号:</div></td>
<td width="67%" height="23"><div align="center"><input type="text" name="tenementno" value=<%=tenementno%>>*</div></td>
</tr>
</table>
</form>

[huanxiangzhe24]

你的tenementno是在try{}中定义的,所以根据变量的作用域,不能在try{}外使用.所以最好把tenementno的定义提到try{}外进行

[friendyou]

多谢多谢！