Question

add = new JButton("Add",new ImageIcon("D:/Android/Assignment/Images/bookAdd.png"));
            add.setToolTipText("Click Add to Store in Database"); // for toast 
    add.setBackground(new Color(233,214,199));
    add.setForeground(new Color(207,108,40));
    add.setFont(b);
            add.addActionListener(new ActionListener() 
            {
                @Override
                public void actionPerformed(ActionEvent ae) 
                {
                String subject=tf2.getText();
                String title=tf3.getText();
                String author=tf4.getText();
                                    int total_books=Integer.parseInt(tf5.getText());


                    try
            {
                                    DriverManager.registerDriver(new oracle.jdbc.OracleDriver());                   

                Class.forName("oracle.jdbc.driver.OracleDriver");

                Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle");
                                   System.out.println("11");
                                    String sql="SELECT * from ADD_BOOKS WHERE (SUBJECT=?) AND (BOOK_TITLE=?)AND (BOOK_AUTHOR=?)";
                                 // String sql="SELECT * from ADD_BOOKS VALUES(?,?,?)";

                                   PreparedStatement pst=con.prepareStatement(sql);
                                   // Statement stmt = con.createStatement();
                                        System.out.println("12");
                                   pst.setString(1, subject);
                                   System.out.println("13");
                                   pst.setString(2, title);
                                   System.out.println("14");
                                   pst.setString(3, author);
                                   System.out.println("15");
                                    ResultSet rs=pst.executeQuery();
                                    System.out.println("16");
                                 //    if (rs! = null)
                                  //   {

                                    while(rs.next())
                                         System.out.println("17");
                                    {

                                        System.out.println("18");

                                        String subjj=rs.getString(1);
                                        String titlee=rs.getString(2);
                                        String authorr=rs.getString(3);
                                     int totalBooks=Integer.parseInt(rs.getString(4));

                                   System.out.println("19");
                                    if((subject.equals(subjj)) && (title.equals(titlee)) && (author.equals(authorr)))
                                   {
                                       System.out.println("20");
                                       totalBooks=totalBooks+total_books;


                                        String updateTableSQL = "UPDATE ADD_BOOKS SET TOTAL_BOOKS = TOTAL_BOOKS+totalBooks";
                            //  + " WHERE SUBJECT = ?";
                                     PreparedStatement pstup=con.prepareStatement(updateTableSQL);            
                             //    pstup=con.prepareStatement(updateTableSQL);
                                    pstup.setInt(4, totalBooks);
                                     pstup.executeUpdate();

                                       JOptionPane.showMessageDialog(null,"Successfully Updated");

                                               }
                                       else
                                       {
                                        try
                                        {


                                            DriverManager.registerDriver(new oracle.jdbc.OracleDriver());


                Class.forName("oracle.jdbc.driver.OracleDriver");

                Connection con1=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","oracle");

                                  PreparedStatement prep1 = con1.prepareStatement("INSERT INTO ADD_BOOKS VALUES(?,?, ?, ?)");

                                    prep1.setString(1, subject);

                                    prep1.setString(2, title);

                                    prep1.setString(3,author);
                                    prep1.setInt(4,total_books);

                                    prep1.executeUpdate();



                                    String nextRowId = Integer.toString(dm.getRowCount());
                                     dm.addRow(new Object[] { 
                                         nextRowId, 

                                            tf2.getText(), 
                                            tf3.getText(),
                                            tf4.getText(),
                                            tf5.getText()
                                     });

                                      tf2.setText("");
                                      tf3.setText("");
                                      tf4.setText("");
                                      tf5.setText("");
                                     System.out.println("Data Stored Into JTable Successfully");

                                    JOptionPane.showMessageDialog(null, "Data is successfully inserted into database");
                                     }
                                       catch(Exception e)
                    {
                        System.out.println(e.getMessage());
                    JOptionPane.showMessageDialog(null, "error in submitting data");
                    }
                                       }
                                   }}
                    catch(Exception e)
                    {
                        System.out.println(e.getMessage());
                    JOptionPane.showMessageDialog(null, "error in submitting data");
                    }
                }});

Answer 1

建议 - 即使您只有一行代码，也总是使用大括号。在您的情况下，您没有这样做，然后您添加了在while循环中执行的System.out，然后您尝试在已经检索数据时获取数据。

这样做：

while (rs.next()) {
                        System.out.println("17");

                        System.out.println("18");
                  //...
}

java.sql.SQLException：已用尽的Resultset

1 个答案: