如何在MongoDB中删除多个ID？
要在MongoDB中删除多个ID，可以使用$in运算符。以下是语法
db.yourCollectionName.remove( { _id : { $in: [yourObjectId1, yourObjectId2, yourObjectId3)] } } );让我们创建包含文档的集合
> db.deleteMultipleIdsDemo.insertOne({"ClientName":"Chris","ClientAge":26});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9cd7d6a629b87623db1b19")
}
> db.deleteMultipleIdsDemo.insertOne({"ClientName":"Robert","ClientAge":28});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9cd7dea629b87623db1b1a")
}
> db.deleteMultipleIdsDemo.insertOne({"ClientName":"Sam","ClientAge":25});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9cd7e9a629b87623db1b1b")
}
> db.deleteMultipleIdsDemo.insertOne({"ClientName":"John","ClientAge":34});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9cd7f7a629b87623db1b1c")
}
> db.deleteMultipleIdsDemo.insertOne({"ClientName":"Carol","ClientAge":36});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9cd803a629b87623db1b1d")
}以下是在find()方法的帮助下显示集合中所有文档的查询
> db.deleteMultipleIdsDemo.find().pretty();
这将产生以下输出
{
"_id" : ObjectId("5c9cd7d6a629b87623db1b19"),
"ClientName" : "Chris",
"ClientAge" : 26
}
{
"_id" : ObjectId("5c9cd7dea629b87623db1b1a"),
"ClientName" : "Robert",
"ClientAge" : 28
}
{
"_id" : ObjectId("5c9cd7e9a629b87623db1b1b"),
"ClientName" : "Sam",
"ClientAge" : 25
}
{
"_id" : ObjectId("5c9cd7f7a629b87623db1b1c"),
"ClientName" : "John",
"ClientAge" : 34
}
{
"_id" : ObjectId("5c9cd803a629b87623db1b1d"),
"ClientName" : "Carol",
"ClientAge" : 36
}以下是在MongoDB中删除多个ID的查询
> db.deleteMultipleIdsDemo.remove( { _id : { $in: [ObjectId("5c9cd7dea629b87623db1b1a"),
... ObjectId("5c9cd803a629b87623db1b1d"),
... ObjectId("5c9cd7d6a629b87623db1b19")
... ] } } );
WriteResult({ "nRemoved" : 3 })让我们检查多个ID是否已删除
> db.deleteMultipleIdsDemo.find().pretty();
以下是显示我们已成功删除3个ID的输出，现在仅剩余2个
{
"_id" : ObjectId("5c9cd7e9a629b87623db1b1b"),
"ClientName" : "Sam",
"ClientAge" : 25
}
{
"_id" : ObjectId("5c9cd7f7a629b87623db1b1c"),
"ClientName" : "John",
"ClientAge" : 34
}