使MongoDB用字符串替换单个数组值？
> db.demo564.insertOne({"StudentName":["Chris","David","Mike","Sam"]});{
"acknowledged" : true, "insertedId" : ObjectId("5e90880a39cfeaaf0b97b576")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo564.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5e90880a39cfeaaf0b97b576"),
"StudentName" : [
"Chris",
"David",
"Mike",
"Sam"
]
}以下是用字符串替换单个数组值的查询-
> db.demo564.updateMany(
... { "StudentName": "David" },
... { "$set": { "StudentName.$": "Carol Taylor" } }
... )
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }
>在find()方法的帮助下显示集合中的所有文档-
> db.demo564.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5e90880a39cfeaaf0b97b576"),
"StudentName" : [
"Chris",
"Carol Taylor",
"Mike",
"Sam"
]
}