我有一个名为“书籍”的集合,我的子文档是这样的
{
Country : 'XYZ'
Books : [
{"name" : "book1", "url" : "book1url", "auth_email" : "emailid1"},
{"name" : "book2", "url" : "book2url", "auth_email" : "emailid2"},
{"name" : "book3", "url" : "book3url", "auth_email" : "emailid3"},
{"name" : "book4", "url" : "book4url", "auth_email" : "emailid4"}
..........................................
]
}
我想将其导出到具有以下格式的 csv 文件
Country | name | url | auth_email| name | url | auth_email | ................
XYZ book1 book1url emailid1 book2 book2url emailid2 ...................
我做了这样的事情
mongoexport -host localhost -db test -collection Books -csv > TopBooksOnline.csv -f Country,Books.name,Books.url,Books.auth_email
但我在“Books.name”、“Books.url”和“Books.auth_email”字段中有空内容
如果我这样做
mongoexport -host localhost -db test -collection Books -csv > TopBooksOnline.csv -f Country,Books
然后它将我所有的子文档合并为一个。
我应该如何进行?