Write update mongo query with multiple where clause - mongodb

Question

New to mongo and I'm struggling to write update mongo query with multiple where clause
Lets say I have a employee list
name |emp_id | old phone number | new phone number
Steve |123 | 123-456-7896 | 801-123-4567
John |456 | 123-654-9878 | 702-123-4567
Steve |789 | 789-123-7890 | 504-123-4567
I would like to write a mongo query essentially saying
Update to new phone number where both name and emp_id matches. The document has about 200 entries.

Answer 1

Since you're having multiple entires to be updated, you can have something like this :
When you say you've a list - Considering its in a file or somewhere to be processed through code then try to read data into an array :
let dataArray = [{name: Steve, emp_id: 123, new_phone_number :801-123-4567},{name: John, emp_id: 456, new_phone_number :702-123-4567},....]
db.getCollection('YourCollection').bulkWrite(
dataArray.map((each) =>
({
updateOne: {
filter: { 'name': each.name, 'emp_id': each.emp_id },
update: { $set: { phone_number: each.new_phone_number } }
}
})
)
)
So here we're considering phone_number as your field to be updated, We didn't consider maintaining two fields old_phone_number & new_phone_number in the documents.
Or in case if you wanted to have two phones numbers in the document then:
db.getCollection('YourCollection').bulkWrite(
dataArray.map((each) =>
({
updateOne: {
filter: { 'name': each.name, 'emp_id': each.emp_id },
update: { $set: { new_phone_number: each.new_phone_number } }
}
})
)
)
As the above - we're injecting a new field new_phone_number to all matched documents, final outcome will have old phone number as a field phone_number and also new phone number in a field new_phone_number .
Also as you haven't mentioned anything particular, if you really need to update each record individually making multiple DB calls, then you can normally use .update() or .updateOne() or .updateMany() .findAndModify() depends on your requirement/interest.
findAndModify , update , updateOne , updateMany

Answer 2

By Default, MongoDB $update method updates single record. But if you want to update multiple documents matching criteria, then you can use Multi parameter (set this to true).
db.people.update(
{ name: "Steve", emp_id:123 }, //this is first parameter of update method. Define your query here
{
new_phone_number: 111-111-111 //This is second parameter. Update operation here
},
{ multi: true } // This is third one. Options here
)
Also look at $updateOne and $updateMany