QueryPlatform class abstract

Represents a query over the data at a particular location.

Inheritance
  • Object
  • PlatformInterface
  • QueryPlatform
Implementers

Constructors

QueryPlatform({required DatabasePlatform database})
Create a QueryPlatform instance

Properties

database → DatabasePlatform
The Database instance associated with this query
final
hashCode → int
The hash code for this object.
no setterinherited
path → String
Returns the path to this reference.
no setter
ref → DatabaseReferencePlatform
Obtains a DatabaseReference corresponding to this query's location.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

get(QueryModifiers modifiers) → Future<DataSnapshotPlatform>
Gets the most up-to-date result for this query.
keepSynced(QueryModifiers modifiers, bool value) → Future<void>
By calling keepSynced(true) on a location, the data for that location will automatically be downloaded and kept in sync, even when no listeners are attached for that location. Additionally, while a location is kept synced, it will not be evicted from the persistent disk cache.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
observe(QueryModifiers modifiers, DatabaseEventType eventType) → Stream<DatabaseEventPlatform>
Assigns the proper event type to a stream for DatabaseEventPlatform
onChildAdded(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are added.
onChildChanged(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are changed.
onChildMoved(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are moved.
onChildRemoved(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are removed. previousChildKey is null.
onValue(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when the data at this location is updated. previousChildKey is null.
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Methods

verify(QueryPlatform instance) → void
Throws an AssertionError if instance does not extend QueryPlatform.
override