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Query MongoDB collection starting with _?
For MongoDB collection beginning with_, following is the syntax −
db.createCollection(‘_yourCollectionName’);
Insert query using below syntax −
db.getCollection('_yourCollectionName').insertOne({"yourFieldName1":"yourValue1","yourFieldName2":yourValue2,............N});Let us first create a collection with documents −
> db.createCollection('_testUnderscoreCollectionDemo');
{ "ok" : 1 }
>db.getCollection('_testUnderscoreCollectionDemo').insertOne({"StudentFirstName":"John","StudentAge":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ccfb4a6140b992277dae0e4")
}
>db.getCollection('_testUnderscoreCollectionDemo').insertOne({"StudentFirstName":"Carol","StudentAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ccfb4af140b992277dae0e5")
}Following is the query to display all documents from a collection with the help of find() method −
> db.getCollection('_testUnderscoreCollectionDemo').find().pretty();This will produce the following output −
{
"_id" : ObjectId("5ccfb4a6140b992277dae0e4"),
"StudentFirstName" : "John",
"StudentAge" : 23
}
{
"_id" : ObjectId("5ccfb4af140b992277dae0e5"),
"StudentFirstName" : "Carol",
"StudentAge" : 21
}
Updated on: 30-Jul-2019
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