如何在MongoDB中基于_id删除文档？
要在MongoDB中基于_id删除文档，请实现以下语法
db.yourCollectionName.remove({“_id”:ObjectId(“yourId”});让我们首先实现以下查询以创建包含文档的集合
>db.removeDocumentOnBasisOfId.insertOne({"UserName":"Larry","UserAge":23,"UserCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c986f9f330fd0aa0d2fe4a3")
}
>db.removeDocumentOnBasisOfId.insertOne({"UserName":"Sam","UserAge":21,"UserCountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c986fb4330fd0aa0d2fe4a4")
}
>db.removeDocumentOnBasisOfId.insertOne({"UserName":"Chris","UserAge":24,"UserCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c986fc0330fd0aa0d2fe4a5")
}
>db.removeDocumentOnBasisOfId.insertOne({"UserName":"Robert","UserAge":26,"UserCountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c986fcf330fd0aa0d2fe4a6")
}
>db.removeDocumentOnBasisOfId.insertOne({"UserName":"David","UserAge":28,"UserCountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c986fed330fd0aa0d2fe4a7")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.removeDocumentOnBasisOfId.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5c986f9f330fd0aa0d2fe4a3"),
"UserName" : "Larry",
"UserAge" : 23,
"UserCountryName" : "US"
}
{
"_id" : ObjectId("5c986fb4330fd0aa0d2fe4a4"),
"UserName" : "Sam",
"UserAge" : 21,
"UserCountryName" : "UK"
}
{
"_id" : ObjectId("5c986fc0330fd0aa0d2fe4a5"),
"UserName" : "Chris",
"UserAge" : 24,
"UserCountryName" : "US"
}
{
"_id" : ObjectId("5c986fcf330fd0aa0d2fe4a6"),
"UserName" : "Robert",
"UserAge" : 26,
"UserCountryName" : "UK"
}
{
"_id" : ObjectId("5c986fed330fd0aa0d2fe4a7"),
"UserName" : "David",
"UserAge" : 28,
"UserCountryName" : "AUS"
}以下是根据_id删除文档的查询
> db.removeDocumentOnBasisOfId.remove({"_id":ObjectId("5c986fc0330fd0aa0d2fe4a5")});
WriteResult({ "nRemoved" : 1 })我们已根据上面的_id删除了Chris的记录。现在显示集合中的所有文档以检查文档是否已删除
> db.removeDocumentOnBasisOfId.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5c986f9f330fd0aa0d2fe4a3"),
"UserName" : "Larry",
"UserAge" : 23,
"UserCountryName" : "US"
}
{
"_id" : ObjectId("5c986fb4330fd0aa0d2fe4a4"),
"UserName" : "Sam",
"UserAge" : 21,
"UserCountryName" : "UK"
}
{
"_id" : ObjectId("5c986fcf330fd0aa0d2fe4a6"),
"UserName" : "Robert",
"UserAge" : 26,
"UserCountryName" : "UK"
}
{
"_id" : ObjectId("5c986fed330fd0aa0d2fe4a7"),
"UserName" : "David",
"UserAge" : 28,
"UserCountryName" : "AUS"
}