完成了修改

src/backend/dao/impl/QuestionsDao.java

@@ -82,6 +82,9 @@ public class QuestionsDao {
             stmt.setString(1, question.getName());
             stmt.setString(2, question.getDescription());
             stmt.setString(3, question.getAnswer());
+            if(question.getFrequency()==null)
+                stmt.setInt(4, 0);
+            else
                 stmt.setInt(4, question.getFrequency());
             row = stmt.executeUpdate();
             stmt.close();
@@ -114,19 +117,22 @@ public class QuestionsDao {
         }
         return row > 0;
     }
-    public boolean updata(Questions question){
+    public boolean update(Questions question){
         int row = 0;
         //1. 从连接池中拿到连接
         Connection conn = DBConnectionPool.getConnection();
         if(conn==null)
             return false;
         //2. 创建Statement对象
-        String sql = "updata questions set name = ?,description = ?,answer = ?,frequency=? where id = ?";
+        String sql = "update questions set name = ?,description = ?,answer = ?,frequency=? where id = ?";
         try{
             PreparedStatement stmt = conn.prepareStatement(sql);
             stmt.setString(1, question.getName());
             stmt.setString(2, question.getDescription());
             stmt.setString(3, question.getAnswer());
+            if(question.getFrequency()==null)
+                stmt.setInt(4, 0);
+            else
                 stmt.setInt(4, question.getFrequency());
             stmt.setInt(5, question.getId());
             row = stmt.executeUpdate();

src/backend/model/Questions.java

@@ -5,7 +5,7 @@ public class Questions {
     private String name;
     private String description;
     private String answer;
-    private int frequency;
+    private Integer frequency;
 
     public int getId() {
         return id;
@@ -39,11 +39,11 @@ public class Questions {
         this.answer = answer;
     }
 
-    public int getFrequency() {
+    public Integer getFrequency() {
         return frequency;
     }
 
-    public void setFrequency(int frequency) {
+    public void setFrequency(Integer frequency) {
         this.frequency = frequency;
     }
 }

src/backend/model/enums/GlobalData.java

@@ -4,8 +4,16 @@ import java.util.*;
 public class GlobalData {
     public static final Map<Integer,String> FREQUENCY_MAP = new HashMap<>();
     static{
+        FREQUENCY_MAP.put(0,"未指定");
         FREQUENCY_MAP.put(1,"低频");
         FREQUENCY_MAP.put(2,"中频");
         FREQUENCY_MAP.put(3,"高频");
     }
+    public static Integer getFrequencyByValue(String value){
+        for(Map.Entry<Integer,String> entry:FREQUENCY_MAP.entrySet()) {
+            if (entry.getValue().equals(value))
+                return entry.getKey();
+        }
+        return 0;
+    }
 }

src/backend/service/impl/QuestionsService.java

@@ -45,4 +45,7 @@ public class QuestionsService {
     public void delete(Integer id){
         questionsDao.delete(id);
     }
+    public boolean update(Questions question){
+        return questionsDao.update(question);
+    }
 }

src/view/EditQuestionDialog.java

@@ -0,0 +1,109 @@
+package view;
+
+import backend.model.Questions;
+import backend.service.impl.QuestionsService;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class EditQuestionDialog extends JDialog{
+    private JTextField nameTextField;
+    private JTextField descriptionTextField;
+    private JTextField answerTextField;
+    private JComboBox frequencyCombobox;
+    private JButton saveButton;
+    private JButton cancelButton;
+    private int type;
+    private Questions question;
+    private QuestionsService questionsService = new QuestionsService();
+
+    public EditQuestionDialog(int type, Questions question) {
+        this.type = type;
+        this.question = question;
+        initView();
+    }
+
+    public void initListener(){
+        saveButton.addActionListener(e->{
+            String name = nameTextField.getText().trim();
+            String description = descriptionTextField.getText().trim();
+            String answer = answerTextField.getText().trim();
+            if(name.equals("")|| description.equals("")|| answer.equals("")) {
+                JOptionPane.showMessageDialog(this, "请填写完整！");
+                return;
+            }
+            Questions questionsPo = new Questions();
+            questionsPo.setName(name);
+            questionsPo.setDescription(description);
+            questionsPo.setAnswer(answer);
+            Integer index=frequencyCombobox.getSelectedIndex();
+            questionsPo.setFrequency(index==0 ? null:index);
+            String message;
+            boolean res;
+            if(type==0) {
+                res = questionsService.insert(questionsPo);
+                message = "添加";
+            }
+            else{
+                questionsPo.setId(question.getId());
+                res = questionsService.update(questionsPo);
+                message = "修改";
+            }
+            if(res)
+                dispose();
+            else
+                JOptionPane.showMessageDialog(this, message+"失败");
+        });
+        cancelButton.addActionListener(e->{
+            dispose();
+        });
+    }
+    private void initView(){
+        setSize(400,300);
+        setLocationRelativeTo(null);//居中
+        add(initPanel());
+        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        setModal(true);//设置模态
+        if(type==0)
+            setTitle("添加问题");
+        else{
+            setTitle("修改问题");
+            nameTextField.setText(question.getName());
+            descriptionTextField.setText(question.getDescription());
+            answerTextField.setText(question.getAnswer());
+            frequencyCombobox.setSelectedIndex(question.getFrequency() == null? 0:question.getFrequency());
+        }
+        //细节：要先初始化监听器，再初始化界面
+        //初始化监听器
+        initListener();
+        //显示界面
+        setVisible(true);
+    }
+    private JPanel initPanel(){
+        JPanel mainPanel = new JPanel();
+        mainPanel.setLayout(new GridLayout(5,2));
+        //第一行 单词
+        mainPanel.add(new JLabel("问题"));
+        nameTextField = new JTextField();
+        mainPanel.add(nameTextField);
+        //第二行 定义
+        mainPanel.add(new JLabel("描述"));
+        descriptionTextField = new JTextField();
+        mainPanel.add(descriptionTextField);
+        //第三行 例句
+        mainPanel.add(new JLabel("答案"));
+        answerTextField = new JTextField();
+        mainPanel.add(answerTextField);
+        //第四行 频率
+        mainPanel.add(new JLabel("频率"));
+        frequencyCombobox = new JComboBox<>(new String[]{"未指定","低频","中频","高频"});
+        mainPanel.add(frequencyCombobox);
+        //第五行 按钮
+        saveButton = new JButton("保存");
+        cancelButton = new JButton("取消");
+        mainPanel.add(saveButton);
+        mainPanel.add(cancelButton);
+        return mainPanel;
+    }
+
+}

src/view/QuestionsPanel.java

@@ -2,9 +2,13 @@ package view;
 import javax.swing.*;
 import javax.swing.table.DefaultTableModel;
 import java.awt.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
 import java.util.Vector;
 
+import backend.model.Questions;
 import backend.service.impl.QuestionsService;
+import backend.model.enums.GlobalData;
 
 public class QuestionsPanel extends JPanel{
     private QuestionsService questionsService = new QuestionsService();
@@ -30,7 +34,7 @@ public class QuestionsPanel extends JPanel{
     }
     public void initListener(){
         queryButton.addActionListener(e->{
-            int frequency = frequencyComboBox.getSelectedIndex()==0?null:frequencyComboBox.getSelectedIndex();
+            Integer frequency = frequencyComboBox.getSelectedIndex()==0?null:frequencyComboBox.getSelectedIndex();
             String key = keyTextField.getText();
             //清楚已有数据
             model.setRowCount(0);
@@ -51,6 +55,44 @@ public class QuestionsPanel extends JPanel{
                 }
             }
         });
+        //添加事件：打开对话框
+        addButton.addActionListener(e->{
+            new EditQuestionDialog(0,null);
+        });
+        editButton.addActionListener(e->{
+            int row = table.getSelectedRow();
+            if(row>=0)
+                openEditDialog(row);
+
+        });
+        //双击某行弹出修改对话框
+        table.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mouseClicked(MouseEvent e) {
+                if(e.getClickCount()==2){
+                    int row = table.getSelectedRow();
+                    openEditDialog(row);
+                }
+            }
+        });
+    }
+
+    private void openEditDialog(int row){
+        Vector<String> data = tableData.get(row);
+        Questions questions = new Questions();
+        questions.setId(Integer.parseInt(data.get(0)));
+        questions.setName(data.get(1));
+        questions.setDescription(data.get(2));
+        questions.setAnswer(data.get(3));
+        questions.setFrequency(GlobalData.getFrequencyByValue(data.get(4)));
+        new EditQuestionDialog(1, questions);
+        //修改成功后刷新并定位修改位置
+        tableData = questionsService.getAll();
+        refreshData();
+        table.setRowSelectionInterval(row,row);
+        scrollPane.getVerticalScrollBar().setValue(row*table.getRowHeight());
+        scrollPane.getHorizontalScrollBar().setValue(0);
+        scrollPane.revalidate();
     }
     public QuestionsPanel(){
         initView();