Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to select only numeric strings in MongoDB?
Let us create a collection with documents −
> db.selectOnlyNumericDemo.insertOne({"UserId":"User101"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cbdb711de8cc557214c0e16")
}
> db.selectOnlyNumericDemo.insertOne({"UserId":"102"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cbdb716de8cc557214c0e17")
}
> db.selectOnlyNumericDemo.insertOne({"UserId":"User103"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cbdb71dde8cc557214c0e18")
}
> db.selectOnlyNumericDemo.insertOne({"UserId":"104"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cbdb725de8cc557214c0e19")
}Display all documents from a collection with the help of find() method −
> db.selectOnlyNumericDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cbdb711de8cc557214c0e16"), "UserId" : "User101" }
{ "_id" : ObjectId("5cbdb716de8cc557214c0e17"), "UserId" : "102" }
{ "_id" : ObjectId("5cbdb71dde8cc557214c0e18"), "UserId" : "User103" }
{ "_id" : ObjectId("5cbdb725de8cc557214c0e19"), "UserId" : "104" }Following is the query to select only numeric strings or check whether string is numeric in MongoDB −
> db.selectOnlyNumericDemo.find({'UserId': /^\d+$/});This will produce the following output −
{ "_id" : ObjectId("5cbdb716de8cc557214c0e17"), "UserId" : "102" }
{ "_id" : ObjectId("5cbdb725de8cc557214c0e19"), "UserId" : "104" }
Updated on: 30-Jul-2019
373 Views
Advertisements