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我無法通過下面的代碼以在用戶的圖像插入到blob字段：我的SQL查詢在servlet/jdbc中的錯誤？將blob插入數據庫..？
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
/**
*
* @author SUKIRTI
*/
@WebServlet(urlPatterns = {"/imageupload"})
@MultipartConfig(maxFileSize = 16177215)
public class imageupload extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet imageupload</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet imageupload at " + request.getContextPath() + "</h1>");
out.println("</body>");
out.println("</html>");
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// processRequest(request, response);
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
InputStream inputStream = null;
Part filePart = request.getPart("photo");
if (filePart != null) {
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/final_project?zeroDateTimeBehavior=convertToNull", "root", "madhumakhis");
String sql = "insert into signup(dp) values(?) where signup.name =" + request.getSession(false).getAttribute("uname")+";";
PreparedStatement statement = con.prepareStatement(sql);
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBlob(1, inputStream);
}
int row = statement.executeUpdate();
if (row > 0) {
out.println("image uploaded");
}
}catch(Exception e){out.println(e);}
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
它表示以下錯誤：
"com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'where signup.name =mummy' at line 1"
其中木乃伊是檢索到的屬性（「UNAME 「）？
我是jsp/servlets中的新手，所以很好解釋我應該怎麼做才能使它工作。