MongoDB 复合条件获取文档?


让我们创建一个包含文档的集合 −

> db.demo714.insertOne({FirstName:"Chris",LastName:"Brown"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea9a2da85324c2c98cc4c2b")
}
> db.demo714.insertOne({FirstName:"Adam",LastName:"Smith"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea9a2e585324c2c98cc4c2c")
}
> db.demo714.insertOne({FirstName:"David",LastName:"Miller"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea9a2ed85324c2c98cc4c2d")
}
> db.demo714.insertOne({FirstName:"John",LastName:"Doe"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5ea9a2f785324c2c98cc4c2e")
}

在集合中通过 find() 方法显示所有文档 −

> db.demo714.find();

将生成以下输出 −

{ "_id" : ObjectId("5ea9a2da85324c2c98cc4c2b"), "FirstName" : "Chris", "LastName" : "Brown" }
{ "_id" : ObjectId("5ea9a2e585324c2c98cc4c2c"), "FirstName" : "Adam", "LastName" : "Smith" }
{ "_id" : ObjectId("5ea9a2ed85324c2c98cc4c2d"), "FirstName" : "David", "LastName" : "Miller" }
{ "_id" : ObjectId("5ea9a2f785324c2c98cc4c2e"), "FirstName" : "John", "LastName" : "Doe" }

以下是对复合条件进行查询 −

> db.demo714.find({"LastName":{$in:["Miller","Brown"]}});

将生成以下输出 −

{ "_id" : ObjectId("5ea9a2da85324c2c98cc4c2b"), "FirstName" : "Chris", "LastName" : "Brown" }
{ "_id" : ObjectId("5ea9a2ed85324c2c98cc4c2d"), "FirstName" : "David", "LastName" : "Miller" }

更新时间: 2020-05-14

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