使用PrepareStatement实现针对于不同表的查询操作涉及到泛型和反射技术（返回的结果集还是一行多列）

使用PrepareStatement实现针对于不同表的查询操作涉及到泛型和反射技术（返回的结果集还是一行多列）

返回的结果是一条记录

public static <T>  T queryTablesCommon(Class<T> clazz,String sql,Object... args){
        Connection connection = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            connection = JDBCUtils.getConnection();
            ps = connection.prepareStatement(sql);
            for(int i=0;i<args.length;i++){
                ps.setObject(i+1,args[i]);
            }
            rs = ps.executeQuery();
            if(rs.next()){
                ResultSetMetaData rsmd = rs.getMetaData();
                int columnCount = rsmd.getColumnCount();
                T t = clazz.newInstance();
                for(int i=0;i<columnCount;i++){
                    String columnLabel = rsmd.getColumnLabel(i + 1);
                    Object objectValue = rs.getObject(i + 1);
                    Field field = clazz.getDeclaredField(columnLabel);
                    field.setAccessible(true);
                    field.set(t,objectValue);
                }
                return t;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(connection,ps,rs);
        }
        return null;
    }

@Test
    public void testTablesCommonQuery(){
        String sql="select name,email from customer where id=?";
        Customer customer = Common.queryTablesCommon(Customer.class, sql, 1);
        System.out.println(customer);

        String sql1="select order_id orderId,order_name orderName from `order` where order_id=?";
        Order order = Common.queryTablesCommon(Order.class, sql1, 1);
        System.out.println(order);
    }