按 ObjectId 展示 MongoDB 记录?
让我们首先创建一个包含文档的集合 -
> db.findByObjectIdDemo.insertOne({"ClientName":"Larry","ClientAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cd657806ebf1256f11a") } > db.findByObjectIdDemo.insertOne({"ClientName":"Chris","ClientAge":26}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cdc57806ebf1256f11b") } > db.findByObjectIdDemo.insertOne({"ClientName":"David","ClientAge":38,"isMarried":true}); { "acknowledged" : true, "insertedId" : ObjectId("5cd68cf657806ebf1256f11c") }
下面是使用 find() 方法从集合中显示所有文档的查询 -
> db.findByObjectIdDemo.find().pretty();
这会产生以下输出 -
{ "_id" : ObjectId("5cd68cd657806ebf1256f11a"), "ClientName" : "Larry", "ClientAge" : 23 } { "_id" : ObjectId("5cd68cdc57806ebf1256f11b"), "ClientName" : "Chris", "ClientAge" : 26 } { "_id" : ObjectId("5cd68cf657806ebf1256f11c"), "ClientName" : "David", "ClientAge" : 38, "isMarried" : true }
下面是按 ObjectId 查找的查询 -
> db.findByObjectIdDemo.find({_id: new ObjectId("5cd68cf657806ebf1256f11c")}).toArray(function(err, myDocument) { console.log(myDocument); });
这会产生以下输出 -
[ { "_id" : ObjectId("5cd68cf657806ebf1256f11c"), "ClientName" : "David", "ClientAge" : 38, "isMarried" : true } ]
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