数据库中的记录（行）是否被删除？

Question

使用以下代码，我尝试从数据库（Javadb）中删除一些行。

system.out.println（）显示正确的行，但是当我在此之后对其进行检查时，它们仍保留在数据库中。

我尝试使用ps.execute（）和ps.executeUpdate（）。

public class DeleteListener implements ActionListener {
 @Override
 public void actionPerformed(ActionEvent ev) {
  try {
   Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
   con3 = DriverManager.getConnection("jdbc:derby://localhost:1527/TESTTABLE","me","1234");
   con3.commit();
   con4 = DriverManager.getConnection("jdbc:derby://localhost:1527/TESTTABLE","me","1234");
   con4.commit();
   String sql = "DELETE FROM ME.SOMETABLE WHERE DATA1=?";
   String sql2 = "DELETE FROM ME.SOMETABLE WHERE DATA2=?";
   int row = t.getSelectedRow();
   int column = t.getColumnCount();
   // might use also without loop
   for(int i = 0; i < column; i++) {
    row2Delete = t.getValueAt(row, 0);
    row2Delete2 = t.getValueAt(row, 1);
   }
   // printing out the row to delete 
   System.out.println("Row 1 to delete is: " + " " + row2Delete);
   System.out.println("Row 2 to delete is: " + " " + row2Delete2);
   // prepare the queries
   ps3 = con3.prepareStatement(sql);
   ps4 = con3.prepareStatement(sql2);
   ps3.setString(1, "+row2Delete+");
   ps4.setString(1, "+row2Delete2+");
   // executing the command
   ps3.execute();
   ps4.execute();
   //checking the amount of rows
   int rowsDeleted = ps3.executeUpdate();
   System.out.println("Row deleted: " + "  " + rowsDeleted);
   if (rowsDeleted > 0) {
    System.out.println(" delete successfully!");
   } ps3.clearParameters(); ps4.clearParameters();  
  } catch (SQLException ex) {
     Logger.getLogger(DBtest.class.getName()).log(Level.SEVERE, null, ex);
    } catch (ClassNotFoundException ex) {
       Logger.getLogger(DBtest.class.getName()).log(Level.SEVERE, null, ex);
      } finally{try{if(ps3!=null)con3.close(); if(con3!=null)con3.close(); if(ps4!=null)con4.close(); if(con4!=null)con4.close();}
      catch (SQLException ex) {
      Logger.getLogger(DBtest.class.getName()).log(Level.SEVERE, null, ex);
   } 
  }
 }
}