使用mongoexport 按条件导出数据 (export mongo database by search conditions)
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referred post: http://www.glenscott.co.uk/blog/exporting-a-single-document-from-mongodb/
简单的说: (long in short)
导出: / export:
$ mongoexport -d 'm_video_fetcher_production' -c 'plans' -q '{cms_category_class: /IphoneSubChannel/}' -o ios_sub_channel_plans.js -p
导入: / import
$ mongoimport -p -d 'm_video_fetcher_real_production' -c 'plans' ios_sub_channel_plans.js