title: Column not found in Java
body: <p>I have a database table in Ms-Access,with coulmn names CANDIDATE1,CANDIDATE2,CANDIDATE3,CANDIDATE4,CANDIDATE5. I have a <code>query</code> which is in the code below</p>
  
  <pre><code>private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
      // TODO add your handling code here:
      try
      {
         String s = (String) jComboBox1.getSelectedItem();
          String sql = "SELECT '"+s+"' FROM results";
          rs = st.executeQuery(sql);
          while(rs.next())
          {
              jLabel1.setText(rs.getString(s));
          }
          JOptionPane.showMessageDialog(null,"U have voted "+jComboBox1.getSelectedItem()+",thank you!");
  
      }
      catch(Exception e)
      {
          JOptionPane.showMessageDialog(null,e);
  
      }
  }        
  </code></pre>
  
  <p>when i try to run the program it throws me a error <code>Column not found</code>. Can I know what is wrong with my code or the query?</p>
  
  <pre><code>net.ucanaccess.jdbc.UcanaccessSQLException: Column not found: ADMK
  at net.ucanaccess.jdbc.UcanaccessResultSet.getString(UcanaccessResultSet.java:689)  at 
  
  net.ucanaccess.jdbc.UcanaccessResultSet.getString(UcanaccessResultSet.java:689)
      at pack.user_vote.jButton1ActionPerformed(user_vote.java:152)
      at pack.user_vote.access$000(user_vote.java:21)
      at pack.user_vote$1.actionPerformed(user_vote.java:87)
      at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
      at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
      at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
      at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
      at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
      at java.awt.Component.processMouseEvent(Component.java:6525)
      at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
      at java.awt.Component.processEvent(Component.java:6290)
      at java.awt.Container.processEvent(Container.java:2234)
      at java.awt.Component.dispatchEventImpl(Component.java:4881)
      at java.awt.Container.dispatchEventImpl(Container.java:2292)
      at java.awt.Component.dispatchEvent(Component.java:4703)
      at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
      at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
      at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
      at java.awt.Container.dispatchEventImpl(Container.java:2278)
      at java.awt.Window.dispatchEventImpl(Window.java:2739)
      at java.awt.Component.dispatchEvent(Component.java:4703)
      at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
      at java.awt.EventQueue.access$400(EventQueue.java:97)
      at java.awt.EventQueue$3.run(EventQueue.java:697)
      at java.awt.EventQueue$3.run(EventQueue.java:691)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
      at java.awt.EventQueue$4.run(EventQueue.java:719)
      at java.awt.EventQueue$4.run(EventQueue.java:717)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
      at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
      at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
      at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
  Caused by: java.sql.SQLException: Column not found: ADMK
      at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
      at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
      at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
      at org.hsqldb.jdbc.JDBCResultSet.findColumn(Unknown Source)
      at org.hsqldb.jdbc.JDBCResultSet.getString(Unknown Source)
      at net.ucanaccess.jdbc.UcanaccessResultSet.getString(UcanaccessResultSet.java:687)
      ... 39 more
  Caused by: org.hsqldb.HsqlException: Column not found: ADMK
      at org.hsqldb.error.Error.error(Unknown Source)
      at org.hsqldb.error.Error.error(Unknown Source)
      ... 43 more
  </code></pre>
  
  <p>NOTE: I'm using <code>ucanaccess</code> for database connectivity.</p>