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Legal StudiesMongoDB 查询嵌入式文档中的字段？
我们先用文档创建一个集合——
> db.embeddedDocumentDemo.insertOne(
... {
... "CustomerDetails":[
... {"CustomerName":"Chris", "CustomerPurchasePrice":3000},
... {"CustomerName":"Robert", "CustomerPurchasePrice":4500},
... {"CustomerName":"David", "CustomerPurchasePrice":1000},
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd32347edc6604c74817ccd")
}下面是对集合中所有文档进行查询的查询，使用的是 find() 方法——
> db.embeddedDocumentDemo.find().pretty();
这将产生下面的输出——
{
"_id" : ObjectId("5cd32347edc6604c74817ccd"),
"CustomerDetails" : [
{
"CustomerName" : "Chris",
"CustomerPurchasePrice" : 3000
},
{
"CustomerName" : "Robert",
"CustomerPurchasePrice" : 4500
},
{
"CustomerName" : "David",
"CustomerPurchasePrice" : 1000
}
]
}下面是查询嵌入式文档——
> db.embeddedDocumentDemo.find({"CustomerDetails.CustomerPurchasePrice":4500});这将产生下面的输出——
{ "_id" : ObjectId("5cd32347edc6604c74817ccd"), "CustomerDetails" : [ { "CustomerName" : "Chris", "CustomerPurchasePrice" : 3000 }, { "CustomerName" : "Robert", "CustomerPurchasePrice" : 4500 }, { "CustomerName" : "David", "CustomerPurchasePrice" : 1000 } ] }
更新于： 30-7-2019
187 次浏览
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