从Java GUI中删除时，记录不会从MySQL数据库表中删除吗？

编辑问题

当我单击删除按钮时，表中的行将在GUI中删除，但不会从mysql服务器中的数据库中删除。

这是代码：

// DatabaseStore 这部分运行正常。

public class DatabaseStore { private final String server = "jdbc:mysql://localhost/"; private final String database = "music_magic"; private final String user_name = "root"; private final String pass_word = ""; private final String driver = "com.mysql.jdbc.Driver"; public Connection doConnection() { Connection c; try { //load the driver Class.forName(driver); c = DriverManager.getConnection(server + database, user_name, pass_word); // JOptionPane.showMessageDialog(null, "Database connected"); } catch (Exception e) { c = null; JOptionPane.showMessageDialog(null, "Error : " + e.getMessage()); } return c; } 

//

 // Imports import Database_music.DatabaseStore; //main database page where i connect to database import java.sql.Connection; import java.sql.SQLException; import java.sql.Statement; import javax.swing.JOptionPane; import javax.swing.table.DefaultTableModel; import magic_music.Items; //ignore this //... // Subject method private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: if(jTable1.getSelectedRow() >=0){ try{ DatabaseStore dtbs = new DatabaseStore(); Connection cn = dtbs.doConnection(); Statement stat = cn.createStatement(); String sql = "DELETE FROM products_info WHERE Product_id ='"+jTable1.getSelectedRow() +"'"; stat.executeUpdate(sql); DefaultTableModel model = (DefaultTableModel)jTable1.getModel(); model.removeRow(jTable1.getSelectedRow()); } catch (SQLException sqlException) { sqlException.printStackTrace(); JOptionPane.showMessageDialog(null, "sql err"); } } else { JOptionPane.showMessageDialog(null, "Please select an item to delete"); } } 

请告诉我，我做错了什么？