Фильтрация данных jTable из базы данных с помощью jComboBox - PullRequest
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Фильтрация данных jTable из базы данных с помощью jComboBox

0 голосов
/ 08 февраля 2019

Я новичок в программировании на Java.Я использовал netbeans 8.2 для создания простых проектов.Теперь я создал jtable с данными из базы данных и использовал jComboBox для фильтрации его данных.

Я хочу, чтобы jTable показывал данные в зависимости от выбранного элемента jCombobox.

jComboBox также подключен к базе данных, но к другой таблице.

Моя база данных

База данных - sales

  • cat: идентификатор, категория
  • product: идентификатор, характеристики, цена, количество

jComboBox подключен к таблице cat и являетсяпоказывая данные из столбца category.

Проблема в том, что jTable не показывает данные.

   package GUI;

    public class MainGUI extends javax.swing.JFrame {

    myQuery mq = new myQuery();

    public MainGUI() {
    initComponents();
    BindCombo();           
    }
    private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {                                            ArrayList <Product> list = mq.getData(jComboBox1.getSelectedItem().toString());
    DefaultTableModel model = new DefaultTableModel();
    model.setColumnIdentifiers(new Object \[\]{"id","specs","price","quantity"}); Object\[\] row = new Object\[4\];
    for (int i= 0; i < list.size();i++){
            row \[0\] = list.get(i).getId();
            row \[1\] = list.get(i).getSpecs();
            row \[2\] = list.get(i).getId();
            row \[3\] = list.get(i).getSpecs();
            model.addRow(row);
    }
    jTable1.setModel(model);
    } 
/*bind jComboBox to database table cat*/
    private void BindCombo(){
        Connection con = myQuery.Connect();
        Statement st;
        ResultSet rs;
        try{

            st = con.createStatement();
            rs = st.executeQuery("SELECT * FROM cat");

            while(rs.next()){
                jComboBox1.addItem(rs.getString(2));
            }
        }catch(SQLException ex){

        }
    }                     


    public class myQuery {

    public static Connection Connect(){
    Connection conn = null;
     try{
     Class.forName("com.mysql.jdbc.Driver");
     conn = riverManager.getConnection("jdbc:mysql://localhost:3306/sales", "root", "");
       System.out.println("Connected");
       return conn;

      }catch(Exception e){
      JOptionPane.showMessageDialog(null, e);
       return null;
          }
       }
       /* fetch data from database to jTable*/
    public ArrayList<Product> getData(String category){
            ArrayList<Product> list = new ArrayList<Product>();
            Connection conn = Connect();
            Statement st = null;
            ResultSet rs = null;


    try{
                st = conn.createStatement();
                rs = st.executeQuery("SELECT 'id', 'specs', 'price', 'quantity' FROM 'product' WHERE 'category'");

                Product p = null;

                while(rs.next()){
                    p = new Product(
                            rs.getInt("id"),
                            rs.getString("specs"),
                            rs.getInt("price"),
                            rs.getInt("quantity")
                    );
                   list.add(p);
                }

            }catch(SQLException ex){

            }
      return list;
    }

    }

Ответы [ 2 ]

0 голосов
/ 09 февраля 2019

@ Абра здесь это метод initComponents

приватный void initComponents () {

        BindingAppPUEntityManager = java.beans.Beans.isDesignTime() ? null : javax.persistence.Persistence.createEntityManagerFactory("BindingAppPU").createEntityManager();
        productQuery = java.beans.Beans.isDesignTime() ? null : BindingAppPUEntityManager.createQuery("SELECT p FROM Product p");
        productList = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : productQuery.getResultList();
        jTabbedPane1 = new javax.swing.JTabbedPane();
        categotyPanel = new javax.swing.JPanel();
        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        jTextField1 = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        jPanel3 = new javax.swing.JPanel();
        jComboBox1 = new javax.swing.JComboBox();
        jLabel3 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jLabel4 = new javax.swing.JLabel();
        productPanel = new javax.swing.JPanel();
        jPanel4 = new javax.swing.JPanel();
        jLabel5 = new javax.swing.JLabel();
        jComboBox2 = new javax.swing.JComboBox();
        jLabel6 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        jTextField3 = new javax.swing.JTextField();
        jLabel8 = new javax.swing.JLabel();
        jTextField4 = new javax.swing.JTextField();
        jLabel9 = new javax.swing.JLabel();
        jTextField5 = new javax.swing.JTextField();
        jButton2 = new javax.swing.JButton();
        jLabel10 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTabbedPane1.setFont(new java.awt.Font("Times New Roman", 0, 18)); // NOI18N

        jPanel1.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jTextField1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jTextField1.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jLabel1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jLabel1.setText("Name");

        jButton1.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N
        jButton1.setText("add");

        jLabel2.setFont(new java.awt.Font("Times New Roman", 0, 18)); // NOI18N
        jLabel2.setText("Add New Category");

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                .addGap(0, 0, Short.MAX_VALUE)
                .addComponent(jLabel2)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                .addGap(95, 95, 95)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jTextField1)
                .addGap(95, 95, 95))
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(12, 12, 12)
                .addComponent(jButton1)
                .addContainerGap())
        );

        jPanel3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jComboBox1.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jComboBox1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBox1ActionPerformed(evt);
            }
        });

        jLabel3.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jLabel3.setText("Available Categories");

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {

            }
        ));
        jScrollPane1.setViewportView(jTable1);

        jLabel4.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
        jLabel4.setText("Available Products");

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGap(20, 20, 20)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
                .addGap(23, 23, 23))
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGap(30, 30, 30)
                .addComponent(jLabel3)
                .addGap(18, 18, 18)
                .addComponent(jComboBox1, 0, 203, Short.MAX_VALUE)
                .addGap(91, 91, 91))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jLabel4)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3))
                .addGap(13, 13, 13)
                .addComponent(jLabel4)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 325, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(19, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 105, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        javax.swing.GroupLayout categotyPanelLayout = new javax.swing.GroupLayout(categotyPanel);
        categotyPanel.setLayout(categotyPanelLayout);
        categotyPanelLayout.setHorizontalGroup(
            categotyPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, categotyPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
        categotyPanelLayout.setVerticalGroup(
            categotyPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(categotyPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        jTabbedPane1.addTab("Category", categotyPanel);

        jPanel4.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jLabel5.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
        jLabel5.setText("Category");

        jComboBox2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N

        jLabel6.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
        jLabel6.setText("Name");

        jTextField2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jTextField2.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jLabel7.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
        jLabel7.setText("CostPrice");

        jTextField3.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jTextField3.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jLabel8.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
        jLabel8.setText("SalePrice");

        jTextField4.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jTextField4.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jLabel9.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
        jLabel9.setText("Quantity");

        jTextField5.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jTextField5.setHorizontalAlignment(javax.swing.JTextField.CENTER);

        jButton2.setFont(new java.awt.Font("Times New Roman", 0, 14)); // NOI18N
        jButton2.setText("Add");

        jLabel10.setFont(new java.awt.Font("Times New Roman", 1, 18)); // NOI18N
        jLabel10.setText("Add new Product");

        javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);
        jPanel4.setLayout(jPanel4Layout);
        jPanel4Layout.setHorizontalGroup(
            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel4Layout.createSequentialGroup()
                .addGap(139, 139, 139)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel6)
                    .addComponent(jLabel7)
                    .addComponent(jLabel8)
                    .addComponent(jLabel9)
                    .addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 56, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(20, 20, 20)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jTextField4, javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jTextField2, javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jTextField3)
                    .addComponent(jTextField5)
                    .addComponent(jComboBox2, 0, 176, Short.MAX_VALUE))
                .addGap(85, 85, 85))
            .addGroup(jPanel4Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel10))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel4Layout.setVerticalGroup(
            jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel4Layout.createSequentialGroup()
                .addGap(17, 17, 17)
                .addComponent(jLabel10)
                .addGap(18, 18, 18)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(25, 25, 25)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel6)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel7)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel8)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel9)
                    .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(44, 44, 44)
                .addComponent(jButton2)
                .addContainerGap(225, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout productPanelLayout = new javax.swing.GroupLayout(productPanel);
        productPanel.setLayout(productPanelLayout);
        productPanelLayout.setHorizontalGroup(
            productPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, productPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
        productPanelLayout.setVerticalGroup(
            productPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(productPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        jTabbedPane1.addTab("Product", productPanel);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1)
        );

        pack();
    }// </editor-fold>
0 голосов
/ 08 февраля 2019

Позвольте мне сначала разобраться.Вы хотите отобразить сетку с именем jTable и обновлять ее содержимое всякий раз, когда в jCombobox1 происходит изменение, верно?Предложение WHERE выглядит подозрительным, так как нет уравнения SARG (аргумент поиска).

rs = st.executeQuery("SELECT 'id', 'specs', 'price', 'quantity' FROM 'product' WHERE 'category'"); You need WHERE 'category' = ???

в ОЧЕНЬ МЕНЬШЕ.Фактически, способ, которым вы перебираете строки, очень неэффективен.Попробуйте каждый раз думать о привязке к полному набору SET вместо цикла for.

...