如何使用 MongoDB 获取数组中包含另一个文档的所有文档？

为此，只需在 MongoDB 中使用点表示法和 find() 即可。让我们创建一个包含文档的集合 -

> db.demo465.insertOne(
... {
...    id: 101,
...    details: [{
...       Name: "Chris",
...       Info: {
...          Subject: "MongoDB",
...          Marks:67
...       }
...    }, {
...          Name: "David",
...          Info: {
...             Subject: "MySQL",
...             Marks:78
...       }
...    }]
... }
... );
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e80421bb0f3fa88e2279061")
}
>
> db.demo465.insertOne(
... {
...    id: 102,
...    details: [{
...       Name: "Bob",
...       Info: {
...          Subject: "Java",
...          Marks:45
...       }
...    }, {
...          Name: "Carol",
...          Info: {
...             Subject: "C",
...             Marks:67
...          }
...       }]
...    }
... );
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e80421cb0f3fa88e2279062")
}

借助 find() 方法显示集合中的所有文档 -

> db.demo465.find();

这将产生以下输出 -

{ "_id" : ObjectId("5e80421bb0f3fa88e2279061"), "id" : 101, "details" : [ { "Name" : "Chris",
"Info" : { "Subject" : "MongoDB", "Marks" : 67 } }, { "Name" : "David", "Info" : { "Subject" :
"MySQL", "Marks" : 78 } } ] }
{ "_id" : ObjectId("5e80421cb0f3fa88e2279062"), "id" : 102, "details" : [ { "Name" : "Bob",
"Info" : { "Subject" : "Java", "Marks" : 45 } }, { "Name" : "Carol", "Info" : { "Subject" : "C",
"Marks" : 67 } } ] }

以下是获取数组中包含另一个文档的所有文档的查询 -

> db.demo465.find({"details.Name":"Bob"});

这将产生以下输出 -

{ "_id" : ObjectId("5e80421cb0f3fa88e2279062"), "id" : 102, "details" : [ { "Name" : "Bob",
"Info" : { "Subject" : "Java", "Marks" : 45 } }, { "Name" : "Carol", "Info" : { "Subject" : "C",
"Marks" : 67 } } ] }