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March 12, 2018 05:23
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1. Get all | |
> db.restaurants.find() | |
2. Limit and sort | |
> db.restaurants.find().limit(10).sort({name: 1}) | |
3. Get by _id | |
> var foundOne = db.restaurants.findOne(); | |
> db.restaurants.findOne(foundOne) | |
4. Get by value | |
> db.restaurants.find({borough: "Queens"}) | |
5. Count | |
> db.restaurants.count() | |
3950 | |
6. Count by nested value | |
> db.restaurants.find({"address.zipcode": "11206"}).count() | |
15 | |
7. Delete by id | |
> var resId = db.restaurants.findOne({})._id; | |
> db.restaurants.remove({_id: resId}) | |
WriteResult({ "nRemoved" : 1 }) | |
8. Update a single document | |
> var newresId = db.restaurants.findOne({})._id; | |
> db.restaurants.updateOne({_id: newresId}, {$set: {"name":"Bizz Bar Bang"}}); | |
{ "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 } | |
9. Update many documents | |
> db.restaurants.updateMany({"address.zipcode": "10035"}, {$set:{"address.zipcode": "10036"}}); | |
{ "acknowledged" : true, "matchedCount" : 12, "modifiedCount" : 12 } | |
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