我们能从 MongoDB 查询结果中删除 _id 吗?
mongodbdatabasebig data analytics更新于 2026/1/17 16:22:17
要从 MongoDB 结果中删除 _id，您需要将 _id 字段设置为 0。语法如下
db.yourCollectionName.find({},{_id:0});
为了理解它，让我们创建一个包含文档的集合。查询如下
> db.removeIdDemo.insertOne({"UserName":"John","UserAge":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9bb4042d66697741252440")
}
> db.removeIdDemo.insertOne({"UserName":"Mike","UserAge":27});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9bb40c2d66697741252441")
}
> db.removeIdDemo.insertOne({"UserName":"Sam","UserAge":34});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9bb4162d66697741252442")
}
> db.removeIdDemo.insertOne({"UserName":"Carol","UserAge":29});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9bb4222d66697741252443")
}
以下查询借助 find() 方法显示集合中的所有文档
> db.removeIdDemo.find().pretty();
这将产生以下输出 −
{
"_id" : ObjectId("5c9bb4042d66697741252440"),
"UserName" : "John",
"UserAge" : 23
}
{
"_id" : ObjectId("5c9bb40c2d66697741252441"),
"UserName" : "Mike",
"UserAge" : 27
}
{
"_id" : ObjectId("5c9bb4162d66697741252442"),
"UserName" : "Sam",
"UserAge" : 34
}
{
"_id" : ObjectId("5c9bb4222d66697741252443"),
"UserName" : "Carol",
"UserAge" : 29
}
以下是从 Mongo 结果中删除 _id 的查询
> db.removeIdDemo.find({},{_id:0});
这将产生以下输出 −
{ "UserName" : "John", "UserAge" : 23 }
{ "UserName" : "Mike", "UserAge" : 27 }
{ "UserName" : "Sam", "UserAge" : 34 }
{ "UserName" : "Carol", "UserAge" : 29 }
