```swift
do {
let result = try await Amplify.DataStore.query(Post.self)
// result will be of type [Post]
print("Posts: \(result)")
} catch let error as DataStoreError {
print("Error on query() for type Post - \(error)")
} catch {
print("Unexpected error \(error)")
}
```
```swift
let sink = Amplify.Publisher.create {
try await Amplify.DataStore.query(Post.self)
}.sink {
if case let .failure(error) = $0 {
print("Error on query() for type Post - \(error)")
}
}
receiveValue: { result in
print("Posts: \(result)")
}
```
### Query by identifier
Query has an alternative signature that allows to fetch a single item by its `id`:
```swift
do {
let result = try await Amplify.DataStore.query(Post.self, byId: "123")
// result will be a single object of type Post?
print("Post: \(result)")
} catch {
print("Error on query() for type Post - \(error)")
}
```
```swift
let sink = Amplify.Publisher.create {
try await Amplify.DataStore.query(Post.self, byId: "123")
}.sink {
if case let .failure(error) = $0 {
print("Error on query() for type Post - \(error)")
}
}
receiveValue: { result in
print("Posts: \(result)")
}
```