got it. I will try to submit a pull. 在 2017年2月13日星期一 UTC+8下午11:33:51，Leonel Câmara写道： > > The DAL doesn't support exists yet, which is kind of bad because count is > quite less efficient than exists when all you want is to know if there is > anything there. > > I would file a ticket in the pydal repository and ask for exists support > even Table.isempty doesn't use exists. Which I see you already did, > https://github.com/web2py/pydal/issues/447 lets see if someone picks it > up otherwise you may have to be the one doing it :) > > Meanwhile if you really needs exists you need to use executesql >
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