问题
When I try to take backup with mongoexport using the --query option to get the documents whose status is equal to A, facing the below error:
mongoexport --port 27017 --db ex --collection A --type=csv --fields _id,status --query '{"status":"A"}' -o eg.csv
error validating settings: query ''{status:A}'' is not valid JSON
Please let me know how to use --query option.
回答1:
Assuming you run this from the DOS command prompt, you need to swap the single and double quotes. You need to wrap the entire query in double quotes and use single quotes inside the JSON document like this:
--query "{'status':'A'}"
I have tested this with mongoexport version 3.0.0 and 3.2.0 and it works for both versions.
来源：https://stackoverflow.com/questions/34393757/mongodb-issue-when-using-mongoexport-with-query-option