MongoDB查询以从集合中删除整个数据
要删除，请在MongoDB中使用remove()。让我们创建一个包含文档的集合-
> db.demo309.insertOne({ "details":[ { "Name":"Chris" }, { "Name":"David" }, { "Name":"Adam" } ] } );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4eb71af8647eb59e562040")
}
> db.demo309.insertOne({ "details":[ { "Name":"David" }, { "Name":"Mike" }, { "Name":"Bob" } ] } );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e4eb7cbf8647eb59e562041")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo309.find();
这将产生以下输出-
{ "_id" : ObjectId("5e4eb71af8647eb59e562040"), "details" : [ { "Name" : "Chris" }, { "Name" : "David" }, { "Name" : "Adam" } ] }
{ "_id" : ObjectId("5e4eb7cbf8647eb59e562041"), "details" : [ { "Name" : "David" }, { "Name" : "Mike" }, { "Name" : "Bob" } ] }以下是从大集合中删除数据的查询-
> db.demo309.remove({});这将产生以下输出-
WriteResult({ "nRemoved" : 2 })