MongoDB查询嵌入式文档中的字段？
首先让我们创建一个包含文档的集合-
> db.embeddedDocumentDemo.insertOne(
... {
... "CustomerDetails":[
... {"CustomerName":"Chris", "CustomerPurchasePrice":3000},
... {"CustomerName":"Robert", "CustomerPurchasePrice":4500},
... {"CustomerName":"David", "CustomerPurchasePrice":1000},
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd32347edc6604c74817ccd")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.embeddedDocumentDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd32347edc6604c74817ccd"),
"CustomerDetails" : [
{
"CustomerName" : "Chris",
"CustomerPurchasePrice" : 3000
},
{
"CustomerName" : "Robert",
"CustomerPurchasePrice" : 4500
},
{
"CustomerName" : "David",
"CustomerPurchasePrice" : 1000
}
]
}以下是嵌入式文档的查询-
> db.embeddedDocumentDemo.find({"CustomerDetails.CustomerPurchasePrice":4500});这将产生以下输出-
{ "_id" : ObjectId("5cd32347edc6604c74817ccd"), "CustomerDetails" : [ { "CustomerName" : "Chris", "CustomerPurchasePrice" : 3000 }, { "CustomerName" : "Robert", "CustomerPurchasePrice" : 4500 }, { "CustomerName" : "David", "CustomerPurchasePrice" : 1000 } ] }