Java 使用NetBeans的MS Access数据库中未发生插入-删除更新_Java_Ms Access_Jdbc_Netbeans_Ucanaccess

Java 使用NetBeans的MS Access数据库中未发生插入-删除更新

java ms-access jdbc netbeans

Java 使用NetBeans的MS Access数据库中未发生插入-删除更新,java,ms-access,jdbc,netbeans,ucanaccess,Java,Ms Access,Jdbc,Netbeans,Ucanaccess,在学习了一些servlet之后，我尝试制作一个简单的学生信息系统。 index.html代码是 <html> <body bgcolor="AliceBlue"> <h1 style="text-align: center">Student Information System</h1> <form method="get" action="MIS"> First Name &l

在学习了一些servlet之后，我尝试制作一个简单的学生信息系统。

index.html

代码是

<html>
    <body bgcolor="AliceBlue">
        <h1 style="text-align: center">Student Information System</h1>
        <form method="get" action="MIS">
         First Name <input type="text" name="FName"/><br><br>
         Last Name <input type="text" name="LName"/><br><br>
         ID <input type="number" name="ID"/><br><br>
         Age <input type="number" name="Age"><br><br>
         <input type="submit" name="Insert" value="Insert">
         <input type="submit" name="Delete" value="Delete">
         <input type="submit" name="Update" value="Update">
        </form>
    </body>
</html>

}

项目运行后,，如果我按下“插入”按钮（输入信息后），则会出现错误

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: LASTNAME

如果我按下删除按钮（输入信息后），则会出现错误

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: LASTNAME

如果我按下更新按钮（输入信息后），它会给出错误信息

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: FIRSTNAME

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::4.0.1 user lacks privilege or object not found: LASTNAME

这是我的MS Access数据库

studentmis.accdb

包含的内容：

请帮助我找到此代码中的问题。如果是数据库身份验证问题，那么我保证我没有为此数据库创建用户名和密码。另外，我保证已经导入了使用Ucanaccess驱动程序所需的所有

.jar

文件

好了，现在其他错误都解决了。现在，当我尝试单击更新按钮时，我得到了这个

errornet.ucanaccess.jdbc.UcanaccessSQLException:ucaesc:：：4.0.1意外标记：ID

。修改的

MIS.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Gaurav
 */
@WebServlet(urlPatterns = {"/MIS"})
public class MIS 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 MIS</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet MIS 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 {
        response.setContentType("text/html");
       PrintWriter pr = response.getWriter();



       try
       {
           Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
           Connection con=DriverManager.getConnection("jdbc:ucanaccess://F://Subjects//WT Netbeans//WT P5//src//studentmis.accdb");
           String FirstName = request.getParameter("FName");
           String LastName = request.getParameter("LName");
           String Insert = request.getParameter("Insert");
           String Update = request.getParameter("Update");
           String Delete = request.getParameter("Delete");
           int ID = Integer.parseInt(request.getParameter("ID"));
           int Age = Integer.parseInt(request.getParameter("Age"));
           String SqlInsert="INSERT INTO student_info(Firstname,Lastname,ID,Age)VALUES(?,?,?,?)";
           String SqlUpdate="UPDATE student_info SET Lastname=? ID=? Age=? WHERE Firstname=?";
           String SqlDelete="DELETE FROM student_info WHERE Firstname=?";
           if(Insert!=null)
           {
               PreparedStatement InsertStatement = con.prepareStatement(SqlInsert);
               InsertStatement.setString(1,FirstName);
               InsertStatement.setString(2,LastName);
               InsertStatement.setInt(3,ID);
               InsertStatement.setInt(4,Age);
               int RowsInserted = InsertStatement.executeUpdate();
               if(RowsInserted > 0)
                pr.println("New User Added Successfully");

           }

           else if(Update!=null)
           {
               PreparedStatement UpdateStatement = con.prepareStatement(SqlUpdate);
               UpdateStatement.setString(1, LastName);
               UpdateStatement.setInt(2,ID);
               UpdateStatement.setInt(3,Age);
               UpdateStatement.setString(4,FirstName);
               int RowsUpdated = UpdateStatement.executeUpdate();
               if(RowsUpdated > 0)
                pr.println("User Updated Successfully");

           }

           else if(Delete!=null)
           {
               PreparedStatement DeleteStatement = con.prepareStatement(SqlDelete);
               DeleteStatement.setString(1,FirstName);
               int RowsDeleted = DeleteStatement.executeUpdate();
               if(RowsDeleted > 0)
                pr.println("User Deleted Successfully");
           }

       } 


       catch (ClassNotFoundException | SQLException ex) 
       {
           pr.println(ex);
       }

        //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);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

出现此错误是因为字段名称不正确，字段名称为：

|  Field1   |   Field1   |  Field3   |   Field4   |

而不是：

|  Firstname |   Lastname   |  ID   |   Age   |

事实上，

Firstname，Lastname，ID，Age

是值，而不是列的名称，所以更正字段的名称，一切都会好起来的

编辑

net.ucanaccess.jdbc.UcanaccessSQLException:UCAExc:：：4.0.1意外令牌：ID

这是合乎逻辑的，因为您将属性设置在错误的位置：

UPDATE student_info SET Lastname=? ID=? Age=? WHERE Firstname=?
//--------------------------1----^--2-^--3--^----------4------^

UpdateStatement.setString(1,FirstName);//<<-----this should be Lastname
UpdateStatement.setString(2,LastName);//<<-----this should be ID
UpdateStatement.setInt(3,ID);//<<-----this should be Age
UpdateStatement.setInt(4,Age);//<<-----this should be Firstname

用于良好实践

不要在Begging

UpdateStatement

编辑

如果缺少yor字段之间的逗号，则更新的正确语法为：

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

因此，在您的查询中：

UPDATE student_info SET Lastname=? ID=? Age=? WHERE Firstname=?
//--------------------------------^----^--miss comma

而是使用：

UPDATE student_info SET Lastname=?, ID=?, Age=? WHERE Firstname=?

谢谢。我真是太傻了。但现在有一个不同的错误。插入和删除正常，但更新无效。当我尝试按下更新按钮时，它给出了一个错误

net.ucanaccess.jdbc.UcanaccessSQLException:ucaesc:：：4.0.1意外标记：ID

。请告诉我可能是什么问题@YCF\u Lcheck my edit@gauravgillalkar你混合了你的属性，因此你得到了这个错误很幸运你建议的编辑不起作用。仍然是完全相同的错误

net.ucanaccess.jdbc.UcanaccessSQLException:UCAExc:：：4.0.1意外标记：ID

@YCF\u Lare您确定@gauravgillalkar可能您更改了if Insert块，如果不发布您更改的代码，请再次检查是的，我更改了正确的块。但我不能在这里发表评论的代码。它说评论太长了。我将改为修改问题@YCF\u L