我有三个JSP，如下:
Employee_vendor_approve.jsp:检索员工详细信息
update_employeeVendorLoginCredentials.jsp:更新过程引用Employee_vendor_approve.jsp页面
update_process_employeeVendorLoginCredentials.jsp:正在更新检索数据
从第 1 点开始，我可以检索数据，但无法继续第 2 点和第 3 点。我无法找到问题在哪里，当我单击 Employee_vendor_approve.jsp 上的更新链接时，update_employeeVendorLoginCredentials.jsp 显示为空白，这是我的代码
Employee_vendor_approve.jsp:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Employee and vendor approve Page</title>
</head>
<body>
<table border="1" align="center">
<tr>
<td>FIRST_NAME </td>
<td>LAST_NAME</td>
<td>ORGANIZATION_NAME</td>
<td>EMPLOYEE_ID</td>
<td>Approve</td>
<td>Status</td>
</tr>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con==DriverManager.getConnection("jdbc:oracle:thin:@173.18.114.213:1821:godb","ex","xe");
statement=con.createStatement();
String Sql="SELECT FIRST_NAME,LAST_NAME,ORGANISATION_NAME,EMPLOYEE_ID,APPROVE from REGISTRATION_EMPLOYEE where role in ('Employee','Vendor')";
resultSet=statement.executeQuery(Sql);
while(resultSet.next()){
%>
<tr>
<td><%=resultSet.getString("FIRST_NAME")%></td>
<td><%=resultSet.getString("LAST_NAME")%></td>
<td><%=resultSet.getString("ORGANISATION_NAME")%></td>
<td><%=resultSet.getString("EMPLOYEE_ID")%></td>
<td><%=resultSet.getString("APPROVE")%></td>
<td>
<a href="update_employeeVendorLoginCredentials.jsp?id=<%=resultSet.getString("EMPLOYEE_ID")%>">update</a>
</td>
</tr>
<%
}
//con.close();
%>
</table>
</body>
</html>
update_employeeVendorLoginCredentials.jsp:
<html>
<body>
<form method="post" action="update_process_employeeVendorLoginCredentials.jsp">
<table border="1">
<tr>
<th>FIRST_NAME </th>
<th>LAST_NAME</th>
<th>ORGANIZATION_NAME</th>
<th>EMPLOYEE_ID</th>
<th>Approve</th>
</tr>
<%
String employee_id=request.getParameter("employee_id");
int sumcount=0;
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@173.18.114.213:1821:godb","ex","xe");
Statement st=con.createStatement();
String query="SELECT FIRST_NAME,LAST_NAME,ORGANISATION_NAME,EMPLOYEE_ID,APPROVE from REGISTRATION_EMPLOYEE where EMPLOYEE_ID="+employee_id;
ResultSet rs=st.executeQuery(query);
while(rs.next())
{
%>
<tr>
<td><input type="text" name="FIRST_NAME" value="<%=rs.getString("FIRST_NAME")%>"> </td>
<td><input type="text" name="LAST_NAME" value="<%=rs.getString("LAST_NAME")%>"> </td>
<td><input type="text" name="ORGANISATION_NAME" value="<%=rs.getString("ORGANISATION_NAME")%>"> </td>
<td><input type="text" name="APPROVE" value="<%=rs.getString("APPROVE")%>"> </td>
<td><input type="hidden" name="EMPLOYEE_ID" value="<%=rs.getString(1)%>"></td>
</tr>
<tr>
<td><input type="submit" name="Submit" value="Update" style="background-color:#49743D;font-weight:bold;color:#ffffff;"></td>
</tr>
<% }
}
catch(Exception ex)
{
}
%>
</table>
</form>
</body>
</html>
update_process_employeeVendorLoginCredentials.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@173.18.114.213:1821:godb","ex","xe");
String EMPLOYEE_ID=request.getParameter("EMPLOYEE_ID");
String first_name=request.getParameter("FIRST_NAME");
String Last_name=request.getParameter("LAST_NAME");
String ORGANISATION_NAME=request.getParameter("ORGANISATION_NAME");
String Approve_status=request.getParameter("APPROVE");
if (EMPLOYEE_ID!=null)
{
// Connection con = null;
PreparedStatement ps = null;
int personID = Integer.parseInt(EMPLOYEE_ID);
try
{
String Sql="update REGISTRATION_EMPLOYEE set APPROVE='Y' where EMPLOYEE_ID="+EMPLOYEE_ID;
ps=con.prepareStatement(Sql);
ps.setString(1, Approve_status);
int i=ps.executeUpdate();
if(i>0)
{
out.print("Record Updated Successfully");
}
else
{
out.print("There is a problem in updating Record.");
}
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
%>
</body>
</html>
最佳答案
在Employee_vendor_approve.jsp:中，您设置名为id的参数名称
<a href="update_employeeVendorLoginCredentials.jsp?id=<%=resultSet.getString("EMPLOYEE_ID")%>">update</a>
但在 update_employeeVendorLoginCredentials.jsp 中，您通过 employee_id 获取参数
String employee_id=request.getParameter("employee_id");
它们不保持相同，所以你得到空值。为了解决这个问题，你可以将其更改为以下内容:
String employee_id=request.getParameter("id");//using id instead of employee_id
对于无法更新数据的问题，也是由于您在 update_employeeVendorLoginCredentials.jsp 中获取了错误的值:
<td><input type="hidden" name="EMPLOYEE_ID" value="<%=rs.getString(1)%>"></td> // you have get the wrong value for id
为了让它工作，请将其更改如下:
<td><input type="hidden" name="EMPLOYEE_ID" value="<%=rs.getString("EMPLOYEE_ID")%>"></td>
关于java - 为什么在jsp中检索数据不更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49851958/