如何在 MongoDB 中删除多个 ID?
mongodbdatabasebig data analytics
要在 MongoDB 中删除多个 ID，可以使用 $in 运算符。语法如下
db.yourCollectionName.remove( { _id : { $in: [yourObjectId1, yourObjectId2, yourObjectId3)] } } );
创建一个包含文档的集合
> 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")
}
以下是借助 find() 方法显示集合中的所有文档的查询
> 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 })
检查多个 ID 是否已被删除
> db.deleteMultipleIdsDemo.find().pretty();
以下输出显示我们已成功删除 3 个 ID，现在只剩下 2 个
{
"_id" : ObjectId("5c9cd7e9a629b87623db1b1b"),
"ClientName" : "Sam",
"ClientAge" : 25
}
{
"_id" : ObjectId("5c9cd7f7a629b87623db1b1c"),
"ClientName" : "John",
"ClientAge" : 34
}
