"MongoDB Learning Note 18" MongoDB query: Find query inline document

Query the embedded document and query the normal document is exactly the same;

For example:

> db.post.find ()    {  "_id"  : objectid ("54ace1394ba07ed75df68f90"),  "Name"  : {  "FirstName"  :  "Joe",  "LastName"  :  "Schome"  },  " Age " : 28 }    { " _id " : objectid (" 54ace14a4ba07ed75df68f91 " ),  "name"  : {  "FirstName"  :  "snail",  "LastName"  :  "Yu"  },   "Age"  : 29 }    {  "_id"  : objectid (" 54ace18d4ba07ed75df68f92 "), " name " : { " FirstName " : " Sunny ", " LastName "  :  "WU"  },  "Age"  : 26 }> db.post.find ({"name": {"FirstName": "Joe", " LastName ":" Schome "})    { " _id " : objectid (" 54ace1394ba07ed75df68f90 "), " Name " : {  FirstName"  :  "Joe",  "LastName"  :  "Schome"  },  "age " : 28 }  &nbsP; > 

Query embedded documents must match exactly, if the order is wrong is not the query;

We can change to "." Pattern to query the embedded document, so that there is no need for exact matching, or the order of irrelevant;

For example:

> Db.post.find ({"Name.firstname": "Joe"}) {"_id": ObjectId ("54ace1394ba07ed75df68f90"), "name": {"FirstName": "Jo E "," LastName ":" Schome "}," Age ": >

This article is from the "Margin with Wish" blog, please be sure to keep this source http://281816327.blog.51cto.com/907015/1600247

"MongoDB Learning Note 18" MongoDB query: Find query inline document