访问 MongoDB 集合中的数组值以获取特定文档
mongodbdatabasebig data analytics更新于 2026/1/9 17:37:17
要访问数组值，请使用点 (.) 符号。让我们创建一个包含文档的集合 −
> db.demo326.insertOne({id:101,"ProductDetails":[{"ProductId":"Prod-101","ProductName":"Product-1"},
... {"ProductId":"Prod-102","ProductName":"Product-2"}
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e516751f8647eb59e562074")
}
> db.demo326.insertOne({id:103,"ProductDetails":[{"ProductId":"Prod-104","ProductName":"Product-5"},
... {"ProductId":"Prod-105","ProductName":"Product-6"}
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e516771f8647eb59e562075")
}
借助 find() 方法显示集合中的所有文档 −
> db.demo326.find();
这将产生以下输出 −
{
"_id" : ObjectId("5e516751f8647eb59e562074"), "id" : 101, "ProductDetails" : [
{ "ProductId" : "Prod-101", "ProductName" : "Product-1" },
{ "ProductId" : "Prod-102", "ProductName" : "Product-2" }
]
}
{
"_id" : ObjectId("5e516771f8647eb59e562075"), "id" : 103, "ProductDetails" : [
{ "ProductId" : "Prod-104", "ProductName" : "Product-5" },
{ "ProductId" : "Prod-105", "ProductName" : "Product-6" }
]
}
以下是访问 MongoDB 集合中的数组并获取特定文档的查询 −
> db.demo326.find({"ProductDetails.ProductId":"Prod-104"});
这将产生以下输出 −
{
"_id" : ObjectId("5e516771f8647eb59e562075"), "id" : 103, "ProductDetails" : [
{ "ProductId" : "Prod-104", "ProductName" : "Product-5" },
{ "ProductId" : "Prod-105", "ProductName" : "Product-6" }
]
}
