parfeval with fetch not working

Question

HILTON MARQUES SANTANA 2022-7-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1758415-parfeval-with-fetch-not-working

编辑： HILTON MARQUES SANTANA 2022-7-14

采纳的回答： Edric Ellis

Hello guys. When I call the fetch() function with parfeval, I get the following error:

parfeval(@fetch,1,database,query)

Error: 'Dot indexing is not supported for variables of this type.'

On the other hand, without parfeval, the function works perfectly. What could it be?

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Answer 1

Edric Ellis 2022-7-13

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You cannot pass database connection objects to workers directly like this. You should use createConnectionForPool . There are examples on that doc page that show you how to set up and use this. You'll end up with something like this:

c = createConnectionForPool(..);
% Wrap the call to "fetch" to unpick the .Value out of the pool connection
% object 'c'.
fut = parfeval(@(c, varargin) fetch(c.Value, varargin{:}), 1, c, query)