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How can use mongodb and node js with complicated query

I want in node js use mongodb.
I can insert,update ,.... in mongo with node. for example i can select with find but i can not Input the result of one query1 for query2.

1 Answer
1

You can first get all the records from the collection that match the where query then loop over to those records to update only those resultant records that have c=4:

where

c=4

MyCollectionName.find(a:$gt: 4, b:$gt: 3, function findResult(err, findResult)
if (err)
console.log('Error on find');
return;

findResult.forEach(function (result)
if(result.c === 4)
result.c = 5;
result.save(function saveResult(err, savedResult)
if (err)
console.log('Error on save');
return;

console.log('Updated...');
return;
);

);
);


Where, MyCollectionName is the mongoose model for the collection you wish to query.

MyCollectionName

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