MongoDB查询将文档添加到已创建的集合中
要将文档添加到已创建的集合中，请在MongoDB中使用$push。让我们创建一个包含文档的集合-
> db.demo177.insertOne(
{ "Id": "101", "details": [
{ "StudentName": "Chris", "Scores": [67, 71, 74], "SubjectName": ["MySQL", "Java"] },
{ "StudentName": "David", "Scores": [89,98,45], "SubjectName": ["PL/SQL", "C"] } ]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5e384b2b9e4f06af551997f4")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo177.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5e384b2b9e4f06af551997f4"),
"Id" : "101",
"details" : [
{
"StudentName" : "Chris",
"Scores" : [ 67, 71, 74 ],
"SubjectName" : [ "MySQL", "Java" ]
},
{
"StudentName" : "David",
"Scores" : [ 89, 98, 45 ],
"SubjectName" : [ "PL/SQL", "C" ]
}
]
}以下是在已创建的集合中添加文档的查询-
> db.demo177.update({"Id": "101"},
...{
... $push: {
... "details": {
... "StudentName": "Chris",
... "Scores": [90, 91, 94],
... "SubjectName": ["MongoDB", "SQL Server"]
... }
... }
...});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })在find()方法的帮助下显示集合中的所有文档-
> db.demo177.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5e384b2b9e4f06af551997f4"),
"Id" : "101",
"details" : [
{
"StudentName" : "Chris",
"Scores" : [ 67, 71, 74 ],
"SubjectName" : [ "MySQL", "Java" ]
},
{
"StudentName" : "David",
"Scores" : [ 89, 98, 45 ],
"SubjectName" : [ "PL/SQL", "C" ]
},
{
"StudentName" : "Chris",
"Scores" : [ 90, 91, 94 ],
"SubjectName" : [ "MongoDB", "SQL Server" ]
}
]
}