MongoDB查询，显示除_id之外的所有字段值
> db.demo590.insert([
... { "Name": "Chris", "Age": 21 },
... {"Name": "Bob", "Age": 20},
... { "Name": "Sam", "Age": 19 }
... ]);
BulkWriteResult({
"writeErrors" : [ ],
"writeConcernErrors" : [ ],
"nInserted" : 3,
"nUpserted" : 0,
"nMatched" : 0,
"nModified" : 0,
"nRemoved" : 0,
"upserted" : [ ]
})在find()方法的帮助下显示集合中的所有文档-
> db.demo590.find();
这将产生以下输出-
{ "_id" : ObjectId("5e92d514fd2d90c177b5bcd0"), "Name" : "Chris", "Age" : 21 }
{ "_id" : ObjectId("5e92d514fd2d90c177b5bcd1"), "Name" : "Bob", "Age" : 20 }
{ "_id" : ObjectId("5e92d514fd2d90c177b5bcd2"), "Name" : "Sam", "Age" : 19 }以下是显示所有字段值的查询，除了_id-
> var listOfObject = [];
> db.demo590.find().forEach(function(d){
... var ob = {};
... ob["StudentFirstName"] = d.Name;
... ob["StudentAge"] = d.Age;
... listOfObject.push(ob);
... });以下是显示文档的查询-
> listOfObject;
这将产生以下输出-
[
{
"StudentFirstName" : "Chris",
"StudentAge" : 21
},
{
"StudentFirstName" : "Bob",
"StudentAge" : 20
},
{
"StudentFirstName" : "Sam",
"StudentAge" : 19
}
]