php?数据的读取
上课形式有很多种,不同的上课形式对应不同的科目,不同的科目对应不同的课程......
这些数据要怎么读取比较合适??
打算用的做法(
当用户点击下拉按钮时,通过ajax将上课形式的的值填充进去.
点击科目下拉按钮时,根据上课形式的选择,在通过ajax将科目的值填充进去
点一次,查一次
)
------解决思路----------------------
都读出来，又用不上，不是浪费吗？
如果还要自己缓存起来，不嫌麻烦吗？
缓存到文件和直接访问数据库有什么区别呢？数据表也是文件
缓存到内存，要运行相关服务和加载相应扩展，不一样增加系统开销吗
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