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How to convert string to numerical values in MongoDB?
You need to use some code in order to convert a string to numerical values in MongoDB.
Let us first create a collection with a document. The query to create a collection with a document is as follows:
> db.convertStringToNumberDemo.insertOne({"EmployeeId":"101","EmployeeName":"Larry"}); { "acknowledged" : true, "insertedId" : ObjectId("5c7f56528d10a061296a3c31") } > db.convertStringToNumberDemo.insertOne({"EmployeeId":"1120","EmployeeName":"Mike"}); { "acknowledged" : true, "insertedId" : ObjectId("5c7f56648d10a061296a3c32") } > db.convertStringToNumberDemo.insertOne({"EmployeeId":"3210","EmployeeName":"Sam"}); { "acknowledged" : true, "insertedId" : ObjectId("5c7f566e8d10a061296a3c33") }
Display all documents from the collection with the help of find() method. The query is as follows −
> db.convertStringToNumberDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c7f56528d10a061296a3c31"), "EmployeeId" : "101", "EmployeeName" : "Larry" } { "_id" : ObjectId("5c7f56648d10a061296a3c32"), "EmployeeId" : "1120", "EmployeeName" : "Mike" } { "_id" : ObjectId("5c7f566e8d10a061296a3c33"), "EmployeeId" : "3210", "EmployeeName" : "Sam" }
Here is the query to convert a string to numerical values in MongoDB. Change “EmployeeId” string to numerical values. The query is as follows −
> db.convertStringToNumberDemo.find().forEach(function(x) ... { ... db.convertStringToNumberDemo.update ... ( ... ... { ... "_id": x._id, ... ... }, ... { ... "$set": ... { ... "EmployeeId": parseInt(x.EmployeeId) ... } ... } ... ) ... } ... );
Now check the documents from the collection. The query is as follows −
> db.convertStringToNumberDemo.find().pretty();
The following is the output displaying the string values (EmployeeId) converted to an integer −
{ "_id" : ObjectId("5c7f56528d10a061296a3c31"), "EmployeeId" : 101, "EmployeeName" : "Larry" } { "_id" : ObjectId("5c7f56648d10a061296a3c32"), "EmployeeId" : 1120, "EmployeeName" : "Mike" } { "_id" : ObjectId("5c7f566e8d10a061296a3c33"), "EmployeeId" : 3210, "EmployeeName" : "Sam" }
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