如何样判断数组操作和数据库操作的开销呢
怎么样判断数组操作和数据库操作的开销呢？
假如不是特别复杂的操作，应该多次查询数据库获取数据，还是一次查询数据库，然后再用数组拼接操作比较好呢？应该怎么判断哪种操作开销比较大呢？谢谢
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