MongoDB查询以使用FindAndUpdate()更新数组？
要更新数组，请在MongoDB中使用findAndModify()。让我们创建一个包含文档的集合-
> db.demo152.insertOne({"id":102,"Name":["Chris","David"],Score:45});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3515bcfdf09dd6d08539dd")
}
> db.demo152.insertOne({"id":103,"Name":["Mike","Carol"],Score:65});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e3515cafdf09dd6d08539de")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo152.find();
这将产生以下输出-
{ "_id" : ObjectId("5e3515bcfdf09dd6d08539dd"), "id" : 102, "Name" : [ "Chris", "David" ], "Score" : 45 }
{ "_id" : ObjectId("5e3515cafdf09dd6d08539de"), "id" : 103, "Name" : [ "Mike", "Carol" ], "Score" : 65 }以下是更新数组的查询-
> var d = db.demo152.findAndModify({
... query: {
... id:102,
... Score: {$lt:50},
... Name: "Chris"
... },
... update: {
... $set : {"Name.$": "Robert"},
... $inc: {Score: 20 }
... }
... }
...
... )在find()方法的帮助下显示集合中的所有文档-
> db.demo152.find();
这将产生以下输出-
{ "_id" : ObjectId("5e3515bcfdf09dd6d08539dd"), "id" : 102, "Name" : [ "Robert", "David" ], "Score" : 65 }
{ "_id" : ObjectId("5e3515cafdf09dd6d08539de"), "id" : 103, "Name" : [ "Mike", "Carol" ], "Score" : 65 }