MySQLを使用してSwiftUIにデータバインディング機能を実装する方法

$ swift package init --type library

dependencies: [
    .package(url: "https://github.com/PerfectlySoft/MySQLConnector.git", from: "3.0.0"),
],

$ swift package generate-xcodeproj

import MySQLConnector

let connection = MySQL()

func connectToDatabase() {
    let host = "localhost"
    let user = "root"
    let password = "your_password"
    let database = "your_database"
    
    guard connection.connect(host: host, user: user, password: password, db: database) else {
        let error = connection.error()
        print("Failed to connect to database: (error)")
        return
    }
    
    print("Connected to MySQL database")
}

struct Item: Identifiable {
    let id: Int
    let name: String
}

class ItemListModel: ObservableObject {
    @Published var items = [Item]()
    
    func fetchItems() {
        guard connection.query(statement: "SELECT * FROM items") else {
            let error = connection.error()
            print("Failed to fetch items from database: (error)")
            return
        }
        
        guard let results = connection.storeResults() else {
            print("Failed to fetch items from database")
            return
        }
        
        items.removeAll()
        
        while let row = results.next() {
            guard let id = row[0] as? Int,
                  let name = row[1] as? String else { continue }
            
            let item = Item(id: id, name: name)
            items.append(item)
        }
    }
}

struct ContentView: View {
    @ObservedObject var itemListModel = ItemListModel()
    
    var body: some View {
        VStack {
            Button(action: {
                self.itemListModel.fetchItems()
            }) {
                Text("Fetch Items")
            }
            
            List(itemListModel.items) { item in
                Text(item.name)
            }
        }
    }
}

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .onAppear(perform: {
                    connectToDatabase()
                })
        }
    }
}