如何让ResultSet在java中打开？

Question

我传递了创建JTable的java文件的值。

ResultSet res = np.InvestmentByInvestType(IType); 
String tablename = "Investment By Invest Type"; 
int customAmt = np.showCustomizeInvestAmount1(IType); 
CommonTable ct = new CommonTable(); 
ct.CommonSearchTable(res, customAmt,tablename); 

我CommonSearchTable创建了一个按钮，使用ResultSet出口JTable的数据。但它显示错误“结果集关闭后不允许操作”。在CommonSearchTable.java的方法如下：

public void CommonSearchTable(final ResultSet res, int totally, final String tablename) throws SQLException 
{ 

     JButton exportTable= new JButton ("Export"); 

     ResultSetMetaData metaData = res.getMetaData(); 
     // names of columns 
     Vector<String> columnNames = new Vector<String>(); 
     int columnCount = metaData.getColumnCount(); 

     for (int column = 1; column <= columnCount; column++) 
     { 
      columnNames.add(metaData.getColumnName(column)); 
     } 
     // data of the table 
     Vector<Vector<String>> data = new Vector<Vector<String>>(); 
     while (res.next()) 
     { 
      Vector<String> vector = new Vector<String>(); 
      for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) 
      { 
       vector.add(res.getString(columnIndex));      
      } 
      data.add(vector); 
     } 

     model1 = new DefaultTableModel(data, columnNames); 
     JTable table = new JTable(model1); 
     int rows = table.getRowCount(); 
     Sorter = new TableRowSorter<DefaultTableModel> (model1); 
     table.setRowSorter(Sorter); 
     showSearchPages(30, 1); 
     table.setModel(model1); 
     String showTotal = "Total Amount : Rs."+totally+"/-"; 
     JPanel footer = new JPanel(); 
     JLabel show = new JLabel(showTotal); 
     box1.setBounds(10,30,800,30);   
     show.setBounds(10, 60, 100, 30); 
     show.setFont(new Font("Tahoma",Font.BOLD,16));    
     footer.add(box1); 
     footer.add(show); 
     footer.setPreferredSize(new Dimension(800,100)); 
     JPanel holdingPanel = new JPanel(null); 
     JScrollPane sp = new JScrollPane(table); 
     JButton print = new JButton ("Print"); 
     print.setBounds(10,10,100,30); 
     exportTable.setBounds(120,10,100,30); 
     sp.setBounds(10,50,780,580); 
     holdingPanel.add(print); 
     holdingPanel.add(exportTable); 
     holdingPanel.add(sp); 
     JFrame f = new JFrame("Search Results"); 
     f.getContentPane().add(holdingPanel,BorderLayout.CENTER); 
     f.getContentPane().add(sp.getVerticalScrollBar(),BorderLayout.EAST); 
     f.getContentPane().add(footer,BorderLayout.SOUTH); 
     f.setPreferredSize(new Dimension(850,680)); 
     f.pack(); 
     f.setLocationRelativeTo(null); 
     f.dispose(); 
     f.setResizable(false); 
     f.setIconImage(img.getImage()); 
     f.setVisible(true); 

     exportTable.addActionListener(new ActionListener() 
     { 
      @Override 
      public void actionPerformed(ActionEvent aev) 
      { 
       try 
       {       
        ExportFile ef = new ExportFile(); 
        ef.WriteFile(res, tablename);       
       } 
       catch (SQLException | IOException ex) 
       { 
        Logger.getLogger(CommonTable.class.getName()).log(Level.SEVERE, null, ex); 
       } 
      }         
     }); 

     print.addActionListener(new ActionListener() 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       PrinterJob printJob = PrinterJob.getPrinterJob(); 
       if (printJob.printDialog()) 
        try 
        { 
         printJob.print(); 
        } 
        catch(PrinterException pe) 
        { 
        } 
      } 
     }); 
} 

请给我带路。

Answer 1

Look at this example this will help you. In this example we fetch all data from database on jcombobox actionlistener. Change this according to your need. 

     class Credit extends JFrame implements ActionListener{ 
     private String value4="0"; 
     private String val="0"; 
     private String val1="0"; 
     private String jama="0",baki="0"; 
     private String nettdate="0",nettb="0",nettbal="0"; 
     private int row=0,count=0,aa=0,bb=0,t1=0; 
     private String tj1="0",tb1="0",gt1="0"; 


     String h[]={"TID","Date","Jama","Baki","Nett"}; 
     private TableModel buildTableModel(ResultSet rs) throws SQLException { 
      ResultSetMetaData metaData = rs.getMetaData(); 
     // names of columns 

      Vector<String> columnNames = new Vector<String>(); 

      int columnCount = metaData.getColumnCount(); 


      for (int column = 0; column < columnCount; column++) { 

       //columnNames.add(metaData.getColumnName(column)); 
       columnNames.add(h[column]); 

      } 

      // data of the table 
       //Vector<Object> vector = new Vector<Object>(); 
       //Vector<Object> vector1 = new Vector<Object>(); 
       Vector<String> vector1 = new Vector<String>(); 
       Vector<String> vector2 = new Vector<String>(); 

      Vector<Vector<String>> data = new Vector<Vector<String>>(); 
      //Vector<Vector<Object>> data = new Vector<Vector<Object>>(); 
      while (rs.next()) { 


       //for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) { 
        Vector<String> vector = new Vector<String>(); 

        //vector.add(rs.getString(columnIndex)); 
        vector.add(rs.getString(1)); 
        vector.add(rs.getString(2)); 
        vector.add(rs.getString(3)); 
        vector.add(rs.getString(4)); 
        vector.add(rs.getString(5)); 
        // System.out.println(vector); 
       //} 
        count++; 
       data.add(vector); 
       //System.out.println(data.get(0).get(0)); 
      } 

      for(int i=0;i<count;i++){ 
       //aa=aa+Integer.parseInt(data.get(i).get(2)); 
       aa=aa+Integer.parseInt(table.getValueAt(i, 2).toString()); 
       System.out.println(table.getValueAt(i, 2).toString()); 
       System.out.println("A:"+aa); 
       //bb=bb+Integer.parseInt(data.get(i).get(3)); 
       bb=bb+Integer.parseInt(table.getValueAt(i, 3).toString()); 
       System.out.println(table.getValueAt(i, 3).toString()); 
       System.out.println("B:"+bb); 

      } 
      tj1=Integer.toString(aa); 
      System.out.println("TJ:"+tj1); 
       //header1 = new Vector<String>(); 
      vector1.add(""); 
      vector1.add("Total"); 
      vector1.add(tj1); 

      tb1=Integer.toString(bb); 
      //header1 = new Vector<String>(); 
      //header3.add("Total"); 
      vector1.add(tb1); 
      vector1.add(""); 
      //data1.setSize(table1.getRowCount()+1); 
      //data1.set(table1.getRowCount()-1, header3); 
      //data.setSize(count++); 
      //data.setSize(table.getRowCount()+1); 
      //data.set(count, header2); 
      System.out.println("h2:"+vector1); 

      data.add(vector1); 
      System.out.println("data:"+data); 

      //data.set(table.getRowCount()-1, header2); 


      t1=Integer.parseInt(tb1)-Integer.parseInt(tj1); 
      gt1=Integer.toString(t1); 
      System.out.println("GT:"+gt1); 

      vector2.add(""); 
      vector2.add("Nett Balance"); 
      //header4.add(""); 
      vector2.add(""); 
      vector2.add(gt1); 
      vector2.add(""); 
      //data.setSize(table.getRowCount()+1); 
      //data.setSize(count++); 
      data.add(vector2); 
      System.out.println("data1:"+data); 
      //data.set(count, header3); 
      //data.set(table.getRowCount()-1, header3); 
      //header2.add(""); 
      count=0; 
      aa=0; 
      bb=0; 
      t1=0; 
      tj1="0"; 
      tb1="0"; 
      gt1="0"; 

      return new DefaultTableModel(data, columnNames); 
     } 
     private static final int GAP = 5; 
     private static final Font BTN_FONT = new Font(Font.DIALOG, Font.PLAIN, 15); 
     private JPanel mainPanel = new JPanel(); 
     JButton add,cancel,show,search,print,update,delete,net; 
     JTextField jTextField,jTextField1,jTextField2,jTextField3,jTextField4,jTextField5; 
     JComboBox jComboBox; 
     String Select[]={"Select"}; 
     Object name,s1; 
     String an="0",nam="0",mono="0",cit="0"; 
     int token=0,tid=1,a,stid=0; 
     JFrame f; 
     AbstractAction action; 
     private String id; 
     Connection con=null; 
       Statement st=null; 
       ResultSet rs=null; 
     //private String stid; 
          JPanel tablePanel; 
          DefaultTableModel model; 
          DefaultTableModel model1; 
          JTable table,table3; 
     private Vector<Vector<String>> data; //used for data from database 
     private Vector<Vector<String>> data1; //used for data from database 
     private Vector<String> header; //used to store data header 
     private Vector<String> header2; //used to store data header 
     private Vector<String> header3; 
     private Vector<String> header4; 
     private JLabel jlab4,jlab5,jlab6,jlab7; 

     Credit(JFrame frm){ 
      Toolkit tk=Toolkit.getDefaultToolkit(); 
     Image img=tk.getImage("1.jpg"); 
     setIconImage(img); 
      JPanel creditPanel = createPanel1("Customer Credit & Debit Amount"); 
      tablePanel = createPanel2("Customer Credit & Debit Table"); 
      creditPanel.setBackground(Color.WHITE); 
      tablePanel.setBackground(Color.WHITE); 
      mainPanel.setLayout(new BorderLayout()); 
      mainPanel.setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP)); 
      mainPanel.add(creditPanel, BorderLayout.PAGE_START); 
      mainPanel.add(tablePanel, BorderLayout.CENTER); 
      creditPanel.setVisible(true); 
      mainPanel.setBackground(Color.BLACK); 
      frm.add(mainPanel); 

     } 
     private JPanel createPanel2(String title){ 
      tablePanel=new JPanel(); 
      tablePanel.setLayout(new BoxLayout(tablePanel,BoxLayout.Y_AXIS)); 

      header = new Vector<String>(); 
      header.add("TID"); 
      header.add("Date"); 
      header.add("Jama"); 
      header.add("Baki"); 
      header.add("Nett"); 
      header4 = new Vector<String>(); 
      header4.add("A/C No."); 
      header4.add("Name"); 
      //header4.add("Date"); 
      header4.add("Mobile"); 
      header4.add("City"); 
      model=new DefaultTableModel(data,header); 
      model1=new DefaultTableModel(data1,header4); 
      table = new JTable(model); 
      table3 = new JTable(model1); 
      table.setRowSorter(new TableRowSorter(model)); 
      table.setRowHeight(30); 
      table3.setRowHeight(30); 
      table.setFont(new Font("Times New Roman",Font.BOLD,15)); 
      table3.setFont(new Font("Times New Roman",Font.BOLD,15)); 
      table.getTableHeader().setFont(new Font("Times New Roman" , Font.BOLD, 15)); 
      table3.getTableHeader().setFont(new Font("Times New Roman" , Font.BOLD, 15)); 
      table.setDefaultRenderer(Object.class, new TableCellRenderer(){ 
      table3.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 
      table3.getColumnModel().getColumn(0).setPreferredWidth(123); 
      table3.getColumnModel().getColumn(1).setPreferredWidth(250); 
      table3.getColumnModel().getColumn(2).setPreferredWidth(123); 
      table3.getColumnModel().getColumn(3).setPreferredWidth(125); 
      JScrollPane scroll=new JScrollPane(table); 
      JScrollPane scroll1=new JScrollPane(table3); 
      scroll1.setPreferredSize(new Dimension(50,63)); 

JPanel p=new JPanel(); 
JButton btn=new JButton("Print"); 
JButton btn1=new JButton("Export"); 
p.add(btn); 
p.add(btn1); 
tablePanel.add(p); 
      tablePanel.add(scroll1); 
      tablePanel.add(scroll); 

      tablePanel.setBorder(BorderFactory.createTitledBorder(title)); 
      return tablePanel; 
     } 
     private JPanel createPanel1(String title) { 
      JPanel addUnitPanel = new JPanel(); 
      addUnitPanel.setLayout(new GridLayout(4,1, GAP, GAP)); 


      JLabel jlab=new JLabel("Name:"); 
      jComboBox=new JComboBox(Select);//Select 
      jlab.setPreferredSize(new Dimension(100,10)); 
      jComboBox.setPreferredSize(new Dimension(150,30)); 

      jComboBox.addActionListener(new ActionListener(){ 
       private int b=0,a=0; 
       private String tj="0"; 
       private String tb="0"; 
       private int t=0; 
       private String gt="0"; 


      public void actionPerformed(ActionEvent ae){ 
       try 
      { 
       Connection con=null; 
       Statement st=null; 
       ResultSet rs=null; 
          // ResultSet rs1=null; 

       Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
       String url=null,userID=null,password=null; 
         String dbFileName=null; 
         String sql=null; 

         dbFileName = "C:/Program Files/Shop/shop.accdb"; 
            //userID = "Admin"; 
            password = "3064101991"; 
         url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};"+ 
           "DBQ="+dbFileName+";"+ 
           "Pwd="+password+";"; 
         //sql = "SELECT * FROM tblUserProfile"; 
         Object name=jComboBox.getSelectedItem(); 
         con=DriverManager.getConnection(url);//,"system","manager" 
          st=con.createStatement(); 
       model.setRowCount(0); 
            model1.setRowCount(0); 
            b=0; 
            a=0; 
            tj="0"; 
            tb="0"; 
            t=0; 
            gt="0"; 
            an="0";nam="0";mono="0";cit="0"; 

            DBEngine dbengine = new DBEngine(); 
      data = dbengine.getJamaCustomer(name); 
      data1 = dbengine.getIdName(name); 
      System.out.println("data:"+data1); 


      Object[] d3={data1.get(0).get(0),data1.get(0). 
     get(1),data1.get(0).get(3),data1.get(0).get(4)}; 
      model1.addRow(d3); 
      JTable table1=new JTable(data,header); 
      for(int i=0;i<table1.getRowCount();i++){ 
      Object[] d={data.get(i).get(0),data.get(i).get(1), 
     data.get(i).get(2),data.get(i).get(3),data.get(i).get(4)}; 
      model.addRow(d); 

      } 
      for(int i=0;i<table1.getRowCount();i++){ 
       a=a+Integer.parseInt(data.get(i).get(2)); 

       b=b+Integer.parseInt(data.get(i).get(3)); 
      } 
      tj=Integer.toString(a); 
      tb=Integer.toString(b); 
      Object[] d1={"","Total",tj,tb,""}; 
      model.addRow(d1); 



      t=Integer.parseInt(tb)-Integer.parseInt(tj); 
      gt=Integer.toString(t); 
      Object[] d2={"","Nett Balance","",gt,""}; 
      model.addRow(d2); 

      table = new JTable(model); 
      table3 = new JTable(model1); 


      table.setRowHeight(30); 
      table3.setRowHeight(30); 
      JScrollPane scroll=new JScrollPane(table); 
      JScrollPane scroll1=new JScrollPane(table3); 
      //scroll.setBackground(Color.red); 
      tablePanel.add(scroll1); 
      tablePanel.add(scroll); 
        rs.close(); 
          // rs1.close(); 
          st.close(); 
          con.close(); 
      } 
      catch(Exception e) 
      { 
       System.out.println("GG"+e); 
      } 

      } 
      }); 

      JPanel p1=new JPanel(); 
      p1.add(jlab); 
      p1.add(jComboBox); 
      addUnitPanel.add(p1); 

      loadcombo2(); 

      addUnitPanel.setBorder(BorderFactory.createTitledBorder(title)); 
      return addUnitPanel; 
     } 

     void loadcombo2() 
     { 
      try 
      { 
       Connection con=null; 
       Statement st=null; 
       ResultSet rs=null; 
          // ResultSet rs1=null; 

       Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
       String url=null,userID=null,password=null; 
         String dbFileName=null; 
         String sql=null; 

         dbFileName = "C:/Program Files/Shop/shop.accdb"; 
            //userID = "Admin"; 
            password = "3064101991"; 
         url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};"+ 
           "DBQ="+dbFileName+";"+ 
           "Pwd="+password+";"; 
         //sql = "SELECT * FROM tblUserProfile"; 
         con=DriverManager.getConnection(url);//,"system","manager" 
            st=con.createStatement(); 

       rs= st.executeQuery("select distinct(Name) from ManageCustomer"); 
       //rs1=st.executeQuery("select Unit from AddUnit"); 
          while(rs.next()) 
       { 
        jComboBox.addItem(rs.getString(1)); 
            //jComboBox1.addItem(rs1.getString(1)); 
       } 
       rs.close(); 
          // rs1.close(); 
          st.close(); 
          con.close(); 
      } 
      catch(Exception e) 
      { 
       System.out.println("GG"+e); 
      } 

     } 


    @Override 
    public void actionPerformed(ActionEvent ae){ 
     if(ae.getSource()==print){ 
    //Your print code 
    } 
    if(ae.getSource()==Export){ 
    //Add jComboBox.addActionListener code here 
    } 
    } 

     public static void main(String args[]){ 
      JFrame frm=new JFrame("Title"); 
      Credit b=new Credit(frm); 
      //frm.setSize(650, 236); 
      frm.setSize(650, 700); 
      frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      frm.setResizable(false); 
      frm.setLocationRelativeTo(null); 
      frm.show(); 
     } 

    } 

Answer 2

正如可以在docs对于结果集读：

一个结果对象被自动关闭时Statement对象 生成它被关闭时，重新执行，或用于检索下一 由多个结果序列产生的结果。

这意味着在关闭数据库连接之前，您必须将结果数据复制到另一个数据结构（如列表，地图，任何适合您的需要）。