java - Jdeveloper 无法在查询中更改表

Question

我创建了一个方法，该方法从 jcombobox 获取表名并将其插入到查询中，以便用户可以搜索选定的表。问题是，例如，当我将选定的表从“人”更改为“线人”时，查询停留在“人”...

这是我的代码：

   private String box_actionPerformed(ActionEvent e) {


            String selected = box.getSelectedItem().toString();


            System.out.println(selected);
            return null;

                }

 public String getSelectedTable(){

 return box.getSelectedItem().toString();
 } 


    private  void button_actionPerformed(ActionEvent e)  {
        DataHandler dh = new DataHandler();
        ResultSet rset;


        try {
            rset = dh.getAllEmployees();
            while (rset.next())
        {
        area.append(rset.getInt(1) + " " + rset.getString(2) + " " + rset.getString(3)+ "\n");
            }
        } catch (SQLException f) {
        }

    }
 }

按钮调用 DataHandler().getAllEmployees()
这是 DataHandler() 的代码

        public ResultSet getAllEmployees() throws SQLException{

                GUI ins = new GUI();
                getDBConnection(); 

                stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);

                query = "SELECT * FROM " + ins.getSelectedTable() + " ORDER BY id";
                System.out.println("\nExecuting query: " + query);
                rset = stmt.executeQuery(query); 
                return rset;

            }