查询 MongoDB — Swift SDK

// This document represents a CoffeeDrink object
let drink: Document = [ "name": "Colombian Blend", "beanRegion": "Timbio, Colombia", "containsDairy": false, "storeNumber": 43]
// Insert the document into the collection
collection.insertOne(drink) { result in
    switch result {
    case .failure(let error):
        print("Call to MongoDB failed: \(error.localizedDescription)")
        return
    case .success(let objectId):
        // Success returns the objectId for the inserted document
        print("Successfully inserted a document with id: \(objectId)")
    }
}

let drink: Document = [ "name": "Bean of the Day", "beanRegion": "Timbio, Colombia", "containsDairy": false, "storeNumber": 42]
let drink2: Document = [ "name": "Maple Latte", "beanRegion": "Yirgacheffe, Ethiopia", "containsDairy": true, "storeNumber": 42]
let drink3: Document = [ "name": "Bean of the Day", "beanRegion": "San Marcos, Guatemala", "containsDairy": false, "storeNumber": 47]
// Insert the documents into the collection
collection.insertMany([drink, drink2, drink3]) { result in
    switch result {
    case .failure(let error):
        print("Call to MongoDB failed: \(error.localizedDescription)")
        return
    case .success(let objectIds):
        print("Successfully inserted \(objectIds.count) new documents.")
    }
}

let queryFilter: Document = ["name": "Colombian Blend"]
collection.findOneDocument(filter: queryFilter) { result in
    switch result {
    case .failure(let error):
        print("Did not find matching documents: \(error.localizedDescription)")
        return
    case .success(let document):
        print("Found a matching document: \(String(describing: document))")
    }
}

let queryFilter: Document = ["name": "Americano"]
collection.find(filter: queryFilter) { result in
    switch result {
    case .failure(let error):
        print("Call to MongoDB failed: \(error.localizedDescription)")
        return
    case .success(let bsonDocumentArray):
        print("Results: ")
        for bsonDocument in bsonDocumentArray {
            print("Coffee drink named: \(String(describing: bsonDocument["name"]))")
        }
    }
}

let queryFilter: Document = ["name": "Americano"]
let findOptions = FindOptions(0, nil, [["beanRegion": 1]])
collection.find(filter: queryFilter, options: findOptions) { result in
    switch result {
    case .failure(let error):
        print("Call to MongoDB failed: \(error.localizedDescription)")
        return
    case .success(let documents):
        print("Results: ")
        for document in documents {
            print("Coffee drink: \(document)")
        }
    }
}

let queryFilter: Document = ["name": "Bean of the Day"]
collection.count(filter: queryFilter) { result in
    switch result {
    case .failure(let error):
        print("Call to MongoDB failed: \(error.localizedDescription)")
        return
    case .success(let count):
        print("Found this many documents in the collection matching the filter: \(count)")
    }
}

let queryFilter: Document = ["name": "Bean of the Day", "storeNumber": 42]
let documentUpdate: Document = ["$set": ["containsDairy": true]]
collection.updateOneDocument(filter: queryFilter, update: documentUpdate) { result in
    switch result {
    case .failure(let error):
        print("Failed to update document: \(error.localizedDescription)")
        return
    case .success(let updateResult):
        if updateResult.matchedCount == 1 && updateResult.modifiedCount == 1 {
            print("Successfully updated a matching document.")
        } else {
            print("Did not update a document")
        }
    }

let queryFilter: Document = ["name": "Bean of the Day"]
let documentUpdate: Document = ["$set": ["containsDairy": true]]
collection.updateManyDocuments(filter: queryFilter, update: documentUpdate) { result in
    switch result {
    case .failure(let error):
        print("Failed to update document: \(error.localizedDescription)")
        return
    case .success(let updateResult):
        print("Successfully updated \(updateResult.modifiedCount) documents.")
    }
}

let queryFilter: Document = ["name": "Bean of the Day", "storeNumber": 55]
let documentUpdate: Document = ["name": "Bean of the Day", "beanRegion": "Yirgacheffe, Ethiopia", "containsDairy": false, "storeNumber": 55]
collection.updateOneDocument(filter: queryFilter, update: documentUpdate, upsert: true) { result in
    switch result {
    case .failure(let error):
        print("Failed to update document: \(error.localizedDescription)")
        return
    case .success(let updateResult):
        if let unwrappedDocumentId = updateResult.documentId {
            print("Successfully upserted a document with id: \(unwrappedDocumentId)")
        } else {
            print("Did not upsert a document")
        }
    }
}

let queryFilter: Document = ["name": "Mocha", "storeNumber": 17]
collection.deleteOneDocument(filter: queryFilter) { deletedResult in
    switch deletedResult {
    case .failure(let error):
        print("Failed to delete a document: \(error.localizedDescription)")
        return
    case .success(let deletedResult):
        print("Successfully deleted a document.")
    }
}

let filter: Document = ["name": "Caramel Latte"]
collection.deleteManyDocuments(filter: filter) { deletedResult in
    switch deletedResult {
    case .failure(let error):
        print("Failed to delete a document: \(error.localizedDescription)")
        return
    case .success(let deletedResult):
        print("Successfully deleted \(deletedResult) documents.")
    }
}

appClient.login(credentials: Credentials.anonymous) { (result) in
    DispatchQueue.main.async {
        switch result {
        case .failure(let error):
            print("Login failed: \(error)")
        case .success(let user):
            print("Login as \(user) succeeded!")
            // Continue below
        }
        
        // Set up the client, database, and collection.
        let client = self.appClient.currentUser!.mongoClient("mongodb-atlas")
        let database = client.database(named: "ios")
        let collection = database.collection(withName: "CoffeeDrinks")
        
        // Watch the collection. In this example, we use a queue and delegate,
        // both of which are optional arguments.
        let queue = DispatchQueue(label: "io.realm.watchQueue")
        let delegate =  MyChangeStreamDelegate()
        let changeStream = collection.watch(delegate: delegate, queue: queue)
        // Adding a document triggers a change event.
        let drink: Document = [ "name": "Bean of the Day", "beanRegion": "Timbio, Colombia", "containsDairy": false, "storeNumber": 42]
        
        collection.insertOne(drink) { result in
            switch result {
            case .failure(let error):
                print("Call to MongoDB failed: \(error.localizedDescription)")
                return
            case .success(let objectId):
                print("Successfully inserted a document with id: \(objectId)")
            }
        }
        // After you're done watching for events, close the change stream.
        changeStream.close()
    }
}

appClient.login(credentials: Credentials.anonymous) { (result) in
    DispatchQueue.main.async {
        switch result {
        case .failure(let error):
            print("Login failed: \(error)")
        case .success(let user):
            print("Login as \(user) succeeded!")
            // Continue below
        }
        
        // Set up the client, database, and collection.
        let client = self.appClient.currentUser!.mongoClient("mongodb-atlas")
        let database = client.database(named: "ios")
        let collection = database.collection(withName: "CoffeeDrinks")
        
        // Watch the collection. In this example, we use a queue and delegate,
        // both of which are optional arguments.
        // `filterIds` is an array of specific document ObjectIds you want to watch.
        let queue = DispatchQueue(label: "io.realm.watchQueue")
        let delegate =  MyChangeStreamDelegate()
        let changeStream = collection.watch(filterIds: [drinkObjectId], delegate: delegate, queue: queue)
        // An update to a relevant document triggers a change event.
        let queryFilter: Document = ["_id": AnyBSON(drinkObjectId) ]
        let documentUpdate: Document = ["$set": ["containsDairy": true]]
        collection.updateOneDocument(filter: queryFilter, update: documentUpdate) { result in
            switch result {
            case .failure(let error):
                print("Call to MongoDB failed: \(error.localizedDescription)")
                return
            case .success(let updateResult):
                print("Successfully updated the document")
            }
        }
        // After you're done watching for events, close the change stream.
        changeStream.close()
    }
}

appClient.login(credentials: Credentials.anonymous) { (result) in
    DispatchQueue.main.async {
        switch result {
        case .failure(let error):
            print("Login failed: \(error)")
        case .success(let user):
            print("Login as \(user) succeeded!")
            // Continue below
        }
        
        // Set up the client, database, and collection.
        let client = self.appClient.currentUser!.mongoClient("mongodb-atlas")
        let database = client.database(named: "ios")
        let collection = database.collection(withName: "CoffeeDrinks")
        
        // Watch the collection. In this example, we use a queue and delegate,
        // both of which are optional arguments.
        let queue = DispatchQueue(label: "io.realm.watchQueue")
        let delegate =  MyChangeStreamDelegate()
        let matchFilter = [ "fullDocument.storeNumber": AnyBSON(42) ]
        let changeStream = collection.watch(matchFilter: matchFilter, delegate: delegate, queue: queue)
        // An update to a relevant document triggers a change event.
        let queryFilter: Document = ["_id": AnyBSON(drinkObjectId) ]
        let documentUpdate: Document = ["$set": ["containsDairy": true]]
        collection.updateOneDocument(filter: queryFilter, update: documentUpdate) { result in
            switch result {
            case .failure(let error):
                print("Call to MongoDB failed: \(error.localizedDescription)")
                return
            case .success(let updateResult):
                print("Successfully updated the document")
            }
        }
        // After you're done watching for events, close the change stream.
        changeStream.close()
    }
}

let user = try await appClient.login(credentials: Credentials.anonymous)
// Set up the client, database, and collection.
let mongoClient = user.mongoClient("mongodb-atlas")
let database = mongoClient.database(named: "ios")
let collection = database.collection(withName: "CoffeeDrinks")
// Set up a task you'll later await to keep the change stream open,
// and you can cancel it when you're done watching for events.
let task = Task {
    // Open the change stream.
    let changeEvents = collection.changeEvents(onOpen: {
        print("Successfully opened change stream")
    })
    // Await events in the change stream.
    for try await event in changeEvents {
        let doc = event.documentValue!
        print("Received event: \(event.documentValue!)")
    }
}
// Updating a document in the collection triggers a change event.
let queryFilter: Document = ["_id": AnyBSON(objectId) ]
let documentUpdate: Document = ["$set": ["containsDairy": true]]
let updateResult = try await collection.updateOneDocument(filter: queryFilter, update: documentUpdate)
// Cancel the task when you're done watching the stream.
task.cancel()
_ = await task.result

let pipeline: [Document] = [["$match": ["storeNumber": ["$eq": 42]]]]
collection.aggregate(pipeline: pipeline) { result in
    switch result {
    case .failure(let error):
        print("Failed to aggregate: \(error.localizedDescription)")
        return
    case .success(let documents):
        print("Successfully ran the aggregation:")
        for document in documents {
            print("Coffee drink: \(document)")
        }
    }
}

let pipeline: [Document] = [["$group": ["_id": "$storeNumber", "numItems": ["$sum": 1]]]]
collection.aggregate(pipeline: pipeline) { result in
    switch result {
    case .failure(let error):
        print("Failed to aggregate: \(error.localizedDescription)")
        return
    case .success(let results):
        print("Successfully ran the aggregation.")
        for result in results {
            print(result)
        }
    }
}

let pipeline: [Document] = [["$project": ["_id": 0, "name": 1, "storeNumber": ["$arrayElemAt": [["$split": ["$store", " "]], 1]]]]]
collection.aggregate(pipeline: pipeline) { result in
    switch result {
    case .failure(let error):
        print("Failed to aggregate: \(error.localizedDescription)")
        return
    case .success(let results):
        print("Successfully ran the aggregation.")
        for result in results {
            print(result)
        }
    }
}

let pipeline: [Document] = [["$addFields": ["storeNumber": ["$arrayElemAt": [["$split": ["$store", " "]], 1]]]]]
collection.aggregate(pipeline: pipeline) { result in
    switch result {
    case .failure(let error):
        print("Failed to aggregate: \(error.localizedDescription)")
        return
    case .success(let results):
        print("Successfully ran the aggregation.")
        for result in results {
            print(result)
        }
    }
}

let pipeline: [Document] = [["$unwind": ["path": "$featuredInPromotions", "includeArrayIndex": "itemIndex"]]]
collection.aggregate(pipeline: pipeline) { result in
    switch result {
    case .failure(let error):
        print("Failed to aggregate: \(error.localizedDescription)")
        return
    case .success(let results):
        print("Successfully ran the aggregation.")
        for result in results {
            print("Coffee drink: \(result)")
        }
    }
}