mongodb update field if not exists
If the field does not exist, $set will add a new field with the specified value, provided that the new field does not violate a type constraint. If you specify a dotted ... ,Insert a New Document if No Match Exists ( Upsert ) If document(s) match the query criteria, db. collection. update() performs an update. If no document matches the query criteria, db. collection. update() inserts a single document. ,Update. For your modified question my solution looks like this - would that work for you? (If not, why?) db.foo.update(site_id: 'xxx', 'title.de': $exists : false}}, ... ,Update. For your modified question my solution looks like this - would that work for you? (If not, why?) db.foo.update(site_id: 'xxx', 'title.de': $exists : false}}, ... , You need not retrieve the document for updating the property A. You can use the update API of mongo to do so. Please find the psuedo code ..., MongoDB - how to only update field if field does not exist. If both retrieved and new document have property A, keep property A (the retrieved one). If retrieved document property A is null or undefined or doesn't exist, update using property A of th, MongoDB - Update a field only if it doesn't exist. Try db.getCollection('memos').update("_id": id, "recipients:$elemMatch: "faculty_number":faculty_number, "memo_seen": $exists: false}}}}, $set: "recipi, upsert: true } ). If this query does not do insert, $setOnInsert won't have any effect. So, the name will be updated only on insert.,You need yo use the $exists operator which will match the documents that contain the field daysSpent db.coll.update( "profession": "devs", "daysSpent": ... , You can use the $exists operator in your query to only match the document if the ... If upsert is true and no document matches the query criteria, ...
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 mongodb update field if not exists 相關參考資料
$set — MongoDB Manual - MongoDB Documentation
If the field does not exist, $set will add a new field with the specified value, provided that the new field does not violate a type constraint. If you specify a dotted ... https://docs.mongodb.com db.collection.update() — MongoDB Manual
Insert a New Document if No Match Exists ( Upsert ) If document(s) match the query criteria, db. collection. update() performs an update. If no document matches the query criteria, db. collection. upd... https://docs.mongodb.com How do I update MongoDB document fields only if they don't ...
Update. For your modified question my solution looks like this - would that work for you? (If not, why?) db.foo.update(site_id: 'xxx', 'title.de': $exists : false}}, ... https://stackoverflow.com How do I update MongoDB document fields only if they don't exist ...
Update. For your modified question my solution looks like this - would that work for you? (If not, why?) db.foo.update(site_id: 'xxx', 'title.de': $exists : false}}, ... https://stackoverflow.com MongoDB - how to only update field if field does not exist
You need not retrieve the document for updating the property A. You can use the update API of mongo to do so. Please find the psuedo code ... https://stackoverflow.com MongoDB - how to only update field if field does not exist - Stack ...
MongoDB - how to only update field if field does not exist. If both retrieved and new document have property A, keep property A (the retrieved one). If retrieved document property A is null or undefi... https://stackoverflow.com MongoDB - Update a field only if it doesn't exist - Stack Overflow
MongoDB - Update a field only if it doesn't exist. Try db.getCollection('memos').update("_id": id, "recipients:$elemMatch: "faculty_number":faculty_number, "... https://stackoverflow.com Mongodb how to insert ONLY if does not exists (no update if exist ...
upsert: true } ). If this query does not do insert, $setOnInsert won't have any effect. So, the name will be updated only on insert. https://stackoverflow.com mongodb shell: update document only if it exists - Stack Overflow
You need yo use the $exists operator which will match the documents that contain the field daysSpent db.coll.update( "profession": "devs", "daysSpent": ... https://stackoverflow.com Update a field only if it exists in MongoDB - Stack Overflow
You can use the $exists operator in your query to only match the document if the ... If upsert is true and no document matches the query criteria, ... https://stackoverflow.com |