DatabaseReferencePlatform class abstract

DatabaseReference represents a particular location in your Firebase Database and can be used for reading or writing data to that location.

This class is the starting point for all Firebase Database operations. After you’ve obtained your first DatabaseReference via FirebaseDatabase.ref(), you can use it to read data (ie. onChildAdded), write data (ie. setValue), and to create new DatabaseReferences (ie. child). Note: QueryPlatform extends PlatformInterface already.

Inheritance

Properties

database → DatabasePlatform
The Database instance associated with this query
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
key → String?
Gets the last token in a Firebase Database location (e.g. ‘fred’ in https://SampleChat.firebaseIO-demo.com/users/fred)
no setter
parent → DatabaseReferencePlatform?
Gets a DatabaseReference for the parent location. If this instance refers to the root of your Firebase Database, it has no parent, and therefore parent() will return null.
no setter
path → String
Returns the path to this reference.
no setterinherited
ref → DatabaseReferencePlatform
Obtains a DatabaseReference corresponding to this query's location.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

child(String path) → DatabaseReferencePlatform
Gets a DatabaseReference for the location at the specified relative path. The relative path can either be a simple child key (e.g. ‘fred’) or a deeper slash-separated path (e.g. ‘fred/name/first’).
get(QueryModifiers modifiers) → Future<DataSnapshotPlatform>
Gets the most up-to-date result for this query.
inherited
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.
inherited
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
inherited
onChildAdded(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are added.
inherited
onChildChanged(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are changed.
inherited
onChildMoved(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are moved.
inherited
onChildRemoved(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when children are removed. previousChildKey is null.
inherited
onDisconnect() → OnDisconnectPlatform
Returns an OnDisconnectPlatform object
onValue(QueryModifiers modifiers) → Stream<DatabaseEventPlatform>
Fires when the data at this location is updated. previousChildKey is null.
inherited
push() → DatabaseReferencePlatform
Generates a new child location using a unique key and returns a DatabaseReference to it. This is useful when the children of a Firebase Database location represent a list of items.
remove() → Future<void>
Remove the data at this Firebase Database location. Any data at child locations will also be deleted.
root() → DatabaseReferencePlatform
Gets a FIRDatabaseReference for the root location.
runTransaction(TransactionHandler transactionHandler, {bool applyLocally = true}) → Future<TransactionResultPlatform>
Performs an optimistic-concurrency transactional update to the data at this Firebase Database location.
set(Object? value) → Future<void>
Write value to the location.
setPriority(Object? priority) → Future<void>
Sets a priority for the data at this Firebase Database location.
setWithPriority(Object? value, Object? priority) → Future<void>
Write a value to the location with the specified priority if applicable.
toString() → String
A string representation of this object.
inherited
update(Map<String, Object?> value) → Future<void>
Update the node with the value

Operators

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