net.ucanaccess.jdbc.UcanaccessSQLException недопустимое состояние курсора

Question

Я получаю следующую ошибку. Может ли кто-нибудь помочь в следующем? У меня есть 2 строки в базе данных. Проблема заключается в результирующий набор курсора не движется, я думаю

консоли журналы:

connection established... 
rs execute... 
rs is not null 
rs is not next... 
inside while.... 
inside do post catch 
**net.ucanaccess.jdbc.UcanaccessSQLException: invalid cursor state: identifier cursor not positioned on row in UPDATE, DELETE, SET, or GET statement: ; ResultSet is empty** 
    at net.ucanaccess.jdbc.UcanaccessResultSet.getInt(UcanaccessResultSet.java:452) 
    at com.test.myservlettest.doPost(myservlettest.java:93) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    **at java.lang.Thread.run(Unknown Source) 
Caused by: java.sql.SQLException: invalid cursor state: identifier cursor not positioned on row in UPDATE, DELETE, SET, or GET statement: ; ResultSet is empty** 
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) 
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) 
    at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) 
    at org.hsqldb.jdbc.JDBCResultSet.getCurrent(Unknown Source) 
    at org.hsqldb.jdbc.JDBCResultSet$JDBCResultSetBasic.getColumnInType(Unknown Source) 
    at org.hsqldb.jdbc.JDBCResultSet.getInt(Unknown Source) 
    at net.ucanaccess.jdbc.UcanaccessResultSet.getInt(UcanaccessResultSet.java:450) 
    ... 23 more 
Caused by: org.hsqldb.HsqlException: invalid cursor state: identifier cursor not positioned on row in UPDATE, DELETE, SET, or GET statement: ; ResultSet is empty 
    at org.hsqldb.error.Error.error(Unknown Source) 
    at org.hsqldb.error.Error.error(Unknown Source) 
    at org.hsqldb.error.Error.error(Unknown Source) 
    ... 28 more 
we are in service method of servlet 

Myservlettest (сервлет класс):

public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException{ 
     System.out.println("Inside Servlet"); 

     Chintandatabase cd = new Chintandatabase(); 
     Connection con = null; 
     String userid =null; 
     String password = null; 

     String un =req.getParameter("username") ; 
     String pw =req.getParameter("userpass") ; 
     String msg =null; 

     System.out.println("username from UI: "+un); 
     System.out.println("password from UI: "+pw); 
     try { 
      con = cd.getConnection(); 
      Statement s = con.createStatement(); 
      s.executeQuery("select SOE_ID,PASSWORD from User"); 
      ResultSet rs = s.getResultSet(); 
      System.out.println("rs execute..."); 
      if(rs==null){System.out.println("rs is null");} 
      else {System.out.println("rs is not null");} 

      if(rs.next()){System.out.println("rs is next");} 
      else {System.out.println("rs is not next...");} 

      while (rs.next() || rs!=null) { 
       System.out.println("inside while...."); 
       System.out.println(rs.getInt(1)); 
       userid = rs.getString("SOE_ID"); 
       password = rs.getString("PASSWORD"); 
      } 
      //s.close(); 
      //con.close(); 
     } catch (SQLException e) { 
      System.out.println("inside do post catch "); 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     System.out.println("we are in service method of servlet"); 


     if ((un.equalsIgnoreCase(userid) && pw.equals(password))){ 

      msg="Hello " + un + "! your login is successfull..."; 
     } 
     else{ 
      msg="Invalid Credentials..."; 

     } 


     res.setContentType("text/html"); 
     PrintWriter out = res.getWriter(); 
     out.println("<font size='6' color=red>" + msg + "</font>"); 
    } 

} 

Chintandatabase Класс: (класс Connection)

package com.database; 

import java.sql.*; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

import com.test.beans.*; 


public class Chintandatabase { 

    public Connection getConnection() throws SQLException { 
     Connection con = null; 
     try { 
      Class.forName("net.ucanaccess.jdbc.UcanaccessDriver"); 
      con = DriverManager.getConnection("jdbc:ucanaccess://C:/ChintanDB/ChintanDB.accdb;memory=false"); 
      System.out.println("connection established..."); 

     } catch (Exception e) { 
      System.out.println("inside get connection catch "); 
      System.out.println("Exception : " + e); 
      e.printStackTrace(); 
     } 
     return con; 

    } 


} 

Answer 1

Проблема в том, что вы уже перемещали курсор в l Инес:

if(rs.next()){System.out.println("rs is next");} 
else {System.out.println("rs is not next...");} 

Просто раскомментируйте их и ваша проблема будет решена

Примечание: И в то время как ниже вам просто нужно это:

while (rs.next()) { 
    .... 
} 

UPDATE Ohhh, и что-то иначе я только заметил. Способ получить данные в вашем ResultSet является следующее:

Statement s = con.createStatement(); 
ResultSet rs = s.executeQuery("select SOE_ID,PASSWORD from User"); 

Смотрите полный пример here