Problem with webreading using webread and weboption

Question

faran 2018-11-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430345-problem-with-webreading-using-webread-and-weboption

评论： faran 2018-11-19

I have a link which I need to read information from it and write my info in the web. I used the codes below:

url = 'http://abc/rest_api/qc_steps.json';   (abc is just an example)
options = weboptions('RequestMethod', 'post', 'ArrayFormat','json');
data = webread(url,options)

I get this error:

Error using readContentFromWebService (line 45)

The server returned the status 500 with message "Internal Server Error : An error occurred (23000): SQLSTATE[23000]: Integrity constraint violation: 1048

Column 'field_qc_step_image_ref_target_id' cannot be null" in response to the request to URL

http://abc/rest_api/qc_steps.json.

which "field_qc_step_image_ref_target_id" is an information in the link. But I don't know how to solve it! Can anyone help?

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faran 2018-11-16

I have this information too.

{

"userId":1,

"slideId":530,

"qcStep":{

"index":"background-scoring",

"value":"rejected",

"selected":{

"index":"0.50"

}

which I thinnk I need to put it on webread, but I get this error:

data = webread(url,'userId','1','slideId','530','index','background-scoring','value','rejected','index','0.50');

Error using readContentFromWebService (line 45)

The server returned the status 404 with message "Not found : Could not find the controller." in response to the request to URL

http://abc/rest_api/qc_steps.json?userId=1&slideId=530&index=background-scoring&value=rejected&index=0.50.

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Answer 1

Hitesh Kumar Dasika 2018-11-19

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/430345-problem-with-webreading-using-webread-and-weboption#answer_347893

Please try using webwrite instead of webread as you are trying to send HTTP POST request to the mentioned server. webread is usually used for HTTP GET Requests.

webwrite

webwrite provides options to put the data in the request as request body and send unlike webread.

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faran 2018-11-19

在 MATLAB Online 中打开

Thanks, It worked.

options = weboptions('RequestMethod', 'post', 'ArrayFormat','json','MediaType','application/json');
datainfo.userId=1;
datainfo.slideId=532;
qcStep.index='background-scoring';
qcStep.value='rejected';
selected.index=0.5;
qcStep.selected=selected;
datainfo.qcStep=qcStep;
response = webwrite(url,datainfo,options)