{
"_id": ObjectId("502626aad4ebdf600b000000"),
"created_at": ISODate("2012-08-11T09: 32: 26.0Z"),
"excerpt": "lotto results for August 11, 2012",
"results": {
"1-digit" : {
"0" : "1",
},
"2-digit" : {
"0" : "1",
"1" : "2",
},
"3-digit" : {
"0" : "1",
"1" : "2",
"2" : "3",
}
}
}
我应该如何检查results.1-digit
是否存在?
您可以运行查询{results.1-digit : {$exists : true }}
希望对您有所帮助。
我相信在外壳中添加引号同样重要
{"results.1-digit" : {$exists : true }}