使用GUI编辑数据库条目

Question

我有这个当前的GUI，在这里我应该能够从数据库条目中检索数据，并将现有数据放入文本字​​段/文本区域中，在其中我可以编辑数据，然后保存新的更改。我通过使用java类共享变量的设置器和获取器，从在此GUI之前加载的GUI中获得要搜索的名称。不幸的是，现在它不会向文本字段/文本区域加载数据，而是像我添加一个全新的条目一样。但我只希望它完全替换它已访问的条目。

 package Cookbook;

 import DatabaseEntry.Applicant;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.swing.JOptionPane;

  public class modifyingRecipe extends javax.swing.JFrame {
  SearchRecipe sr;
   /**
    * Creates new form modifyingRecipe
    */
  public modifyingRecipe() {
    initComponents();
    sr = new SearchRecipe();
    presetPage();
   }
  private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here
    try {
        String url = "jdbc:derby://localhost:1527/Cookbook";
        Connection conn = DriverManager.getConnection(url);
        String query = "INSERT into RECIPES(NAME, SUBCATEGORY, CATEGORY, INGREDIENTS, 
        INSTRUCTIONS, MODIFICATIONS) values(?,?,?,?,?,?)";
        PreparedStatement pst = conn.prepareStatement(query);

        pst.setString(1, txtName.getText());
        pst.setString(2, txtSubcategory.getText());
        pst.setString(3, cmbCategory.getSelectedItem().toString());
        pst.setString(4, txtIngredients.getText());
        pst.setString(5, txtInstructions.getText());
        pst.setString(6, txtMod.getText());
        pst.executeUpdate();

    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }

    this.dispose();
    CookbookApp c = new CookbookApp();
    c.setVisible(true);
    JOptionPane.showMessageDialog(null, "Recipe successfully modified!");
}                                        
public ArrayList<Cookbook> getList() {
    ArrayList<Cookbook> recipeList = new ArrayList();

    try {
        String url = "jdbc:derby://localhost:1527/Cookbook;databaseName=Cookbook";
        Connection conn = DriverManager.getConnection(url);
        String query = "SELECT * FROM RECIPES";
        PreparedStatement pst = conn.prepareStatement(query);
        ResultSet rs = pst.executeQuery();

        Cookbook recipe;

        while (rs.next()) {
            recipe = new Cookbook(rs.getString("NAME"), rs.getString("SUBCATEGORY"),
                    rs.getString("CATEGORY"), rs.getString("INGREDIENTS"), rs.getString("INSTRUCTIONS"),rs.getString("MODIFICATIONS"));
            recipeList.add(recipe);
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
    }
    return recipeList;
}

public void presetPage(){
    String name = sr.getSearch();
    ArrayList<Cookbook> recipeList = getList(); 
    for (int i = 0; i < recipeList.size(); i++) {
        if (recipeList.get(i).getName().equals(name)){
            txtName.setText(recipeList.get(i).getName());
            cmbCategory.setSelectedItem(recipeList.get(i).getCategory());
            txtSubcategory.setText(recipeList.get(i).getSubcategory());
            txtIngredients.setText(recipeList.get(i).getIngredients());
            txtInstructions.setText(recipeList.get(i).getInstructions());
            txtMod.setText(recipeList.get(i).getModifications());
        }
    }

}