mongodb check if field exists
db.records.find( { a: { $exists: true } } )mongodb check if field exists
db.records.find( { a: { $exists: true } } )mongodb check if field exists java
DBObject query;
query = new BasicDBObject("fields_name", new BasicDBObject("$exists", true));
DBCursor result = collection.find(query);mongodb check if field exists
db.records.find( { a: { $exists: true } } )mongodb check if field exists java
DBObject query;
query = new BasicDBObject("fields_name", new BasicDBObject("$exists", true));
DBCursor result = collection.find(query);Copyright © 2021 Codeinu
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