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一次性读掏出所有数据和limit分批读出数据哪个好

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Release： 2016-06-13 11:40:11
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一次性读取出所有数据和limit分批读出数据哪个好啊
在采集时，比如数据库有10万条记录url   是列表页面的网址

1、一次性从数据库读出这10万条url，然后foreach进行采集
2、先limit10条， foreach采集完，再读取数据库limit，不断重复

一般用哪种方法啊？

Related labels：
foreach limit nbsp url
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