我想编辑学生详细信息。我可以通过将 rollno 作为输入来检索所有字段，但数据库中的 textarea 字段除外。如何从数据库中将数据检索到 textarea。这里的地址字段是 textarea。我无法从数据库中检索地址
editstudent.jsp
<body>
<!--<form id="frmExamRegistration" method="post" enctype="multipart/form-data" class="anu">-->
<form name="f1" method="post" class="anu" action="Edit_studentdetails.jsp">
<%@include file="adminheader.jsp"%>
<%@include file="sidemenus.jsp" %>
<div id="container">
<div style="float:right;width:10%;border:0;font-color:#163362"><a href=logout.jsp">Log Out</a></div><br>
<div class="content"><center>Edit Student</center><br>
<div class="formElements,rightcol" align="center">
<label>Rollno:
<span><input type="text" id="txtRollno" name="txtRollno" ></span></label>
</div><br>
<div class="buttons">
<button type="submit" class="primaryAction">Edit</button>
<button type="reset" class="primaryAction">Clear</button>
</div>
</div>
</div>
</form>
</body>
edit_studentdetails.jsp
<body>
<form name="f1" method="post" class="anu" action="Update_studentdetails.jsp">
<%@include file="adminheader.jsp"%>
<%@include file="sidemenus.jsp" %>
<%@include file="jsp/jdbcresults.jsp" %>
<%
Connection dbConnection = con;
String Rollno=request.getParameter("txtRollno");
String BatchCode="";
String CourseCode="";
String Fullname="";
String Fathername="";
Date DOB=null;
String fmtdob=null;
String Gender="";
Date DOJ=null;
String fmtdoj=null;
String Email="";
String Phone="";
String address=null;
String Hallticketno="";
java.text.SimpleDateFormat formatter=new java.text.SimpleDateFormat("dd-mm-yyyy");
// String Photo=request.getParameter("txtPhoto");
try
{
String selectStoredProc = "SELECT * FROM STUDENTS WHERE ROLLNO = '"+Rollno+"'";
PreparedStatement ps = dbConnection.prepareStatement(selectStoredProc);
ResultSet rs=ps.executeQuery();
while(rs.next()) {
Rollno = rs.getString("rollno");
BatchCode=rs.getString("batchcode");
CourseCode=rs.getString("ccode");
Fullname=rs.getString("fullname");
Fathername=rs.getString("fathername");
DOB=rs.getDate("dob");
// fmtdob =formatter.format(DOB);
Gender=rs.getString("gender");
DOJ=rs.getDate("doj");
// fmtdoj =formatter.format(DOJ);
Email=rs.getString("email");
Phone=rs.getString("phone");
address=rs.getString("address");
Hallticketno=rs.getString("hallticketno");
}
rs.close();
rs = null;
}
catch (Exception e) {
System.out.println(e.getLocalizedMessage());
}
finally {
if(dbConnection != null){
dbConnection.close();
dbConnection = null;
}
}
%>
<div id="container">
<div style="float:right;width:10%;border:0;font-color:#163362"><a href=logout.jsp">Log Out</a></div><br>
<div class="content"><center>Edit Student Details</center><br>
<div class="formElements,rightcol" align="center" width="100%">
<label>Roll no:
        <span><input type="text" id="txtRollno" name="txtRollno" value="<%= Rollno%>" readonly='true'></span></label><br>
<label>Batch code:
   <span><input type="text" id="txtBatchcode" name="txtBatchcode" value="<%= BatchCode%>" readonly='true'></span></label><br>
<label>Course code:
<span><input type="text" id="txtCoursecode" name="txtCoursecode" value="<%= CourseCode %>" readonly='true'></span></label><br>
<label>Full Name:
      <span><input type="text" id="txtFullname" name="txtFullname" value="<%= Fullname %>" ></span></label><br>
<label>Father Name: 
<span><input type="text" id="txtFathername" name="txtFathername" value="<%= Fathername %>" ></span></label><br>
<label>Date Of Birth:    
<input type="date" name="txtDob" id="txtDob" value="<%= DOB %>" ></label><br>
<label>                                        Gender:
<% if (Gender.equals("male")){%>
<input type=Radio name='txtGender' value='male' checked='true'> Male
<%}else{%>
<input type=Radio name='txtGender' value='male'>Male
<%} if (Gender.equals("female")){%>
<input type=Radio name='txtGender' value='female' checked='true'> Female</td></tr>
<%}else{%>
<input type=Radio name='txtGender' value='female'><b> Female</td></tr>
<%}%></label><br>
<label>                                                       Date Of Join:
<input type="date" name="txtDoj" id="txtDoj" value="<%= DOJ %>" ></label><br>
<label>Email id:
   <span><input type="text" id="txtEmailid" name="txtEmailid" value="<%= Email %>" ></span></label><br>
<label>Phone No.:
   <span><input type="text" id="txtPhoneno" name="txtPhoneno" value="<%= Phone %>" ></span></label><br>
<label>Address:
   <span><textarea rows="4" cols="30" name="txtaddress" id="txtaddress" textareaObject.value="text" value="<%= address %>" ></textarea></span></label><br>
<label>Hall ticket no.:
   <span><input type="text" id="txtHallticketno" name="txtHallticketno" value="<%= Hallticketno%>" ></span></label><br>
<!--<label>Photo:
<input type="file" id="txtPhoto" name="txtPhoto" ></span></label><br>-->
</div>
<div class="buttons">
<button type="submit" class="primaryAction">Edit</button>
<button type="reset" class="primaryAction">Clear</button>
</div>
</div>
</div>
</form>
</body>
update_studentdetails.jsp
<body >
<!--<form id="frmExamRegistration" method="post" enctype="multipart/form-data" class="anu">-->
<form name="f1" method="post" class="anu">
<table valign="top" height="800" width="1024">
<tr><td colspan="2"><%@include file="adminheader.jsp"%></td></tr>
<!--<div id="container">
<div class="content"><center><h4> Grades</h4></center> -->
<tr><td colspan="2" bgcolor="#A1A1AE">
<div style="float:right;width:10%;border:0;font-color="ffffff";"><a href=logout.jsp">Log Out</a></div></td>
<tr><td height="600" valign="top">
<%@include file="sidemenus.jsp" %></td>
<td>
<%@include file="jsp/jdbcresults.jsp" %>
<%
// Hope you are getting the connection part
CallableStatement cstmt=null;
String Rollno=request.getParameter("txtRollno");
String BatchCode=request.getParameter("txtBatchcode");
String CourseCode=request.getParameter("txtCoursecode");
String Fullname=request.getParameter("txtFullname");
String Fathername=request.getParameter("txtFathername");
String DOB=request.getParameter("txtDob");
String Gender=request.getParameter("txtGender");
String DOJ=request.getParameter("txtDoj");
String Email=request.getParameter("txtEmailid");
String Phone=request.getParameter("txtPhoneno");
String Address=request.getParameter("txtaddress");
String Hallticketno=request.getParameter("txtHallticketno");
try {
cstmt=con.prepareCall("{call udp_modifystudent(?,?,?,?,?,?,?,?,?,?,?,?)}");
cstmt.setString(1,Rollno);
cstmt.setString(2,BatchCode);
cstmt.setString(3,CourseCode);
cstmt.setString(4,Fullname);
cstmt.setString(5,Fathername);
cstmt.setString(6,DOB);
cstmt.setString(7,Gender);
cstmt.setString(8,DOJ);
cstmt.setString(9,Email);
cstmt.setString(10,Phone);
cstmt.setString(11,Address);
cstmt.setString(12,Hallticketno);
cstmt.executeUpdate();
out.print("Student updated successfully");
}
catch(Exception e){
out.print("Exception: "+e.getMessage());
}
finally {
cstmt.close();
con.close();
}
%>
</td></tr>
</table></form></body>