Query<T> class abstract

Querying is how you find records that match certain conditions.

Available extensions

Constructors

Query()

Properties

hashCode → int
The hash code for this object.
no setterinherited
isar → Isar
The corresponding Isar instance.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

average() → Future<double>

Available on Query<T?>, provided by the QueryAggregation extension

Returns the average value of this query.
averageSync() → double

Available on Query<T?>, provided by the QueryAggregation extension

Returns the average value of this query.
count() → Future<int>
Count how many objects match this query.
countSync() → int
Count how many objects match this query.
deleteAll() → Future<int>
Delete all objects that match this query. Returns the number of deleted objects.
deleteAllSync() → int
Delete all objects that match this query. Returns the number of deleted objects.
deleteFirst() → Future<bool>
Delete the first object that matches this query. Returns whether a object has been deleted.
deleteFirstSync() → bool
Delete the first object that matches this query. Returns whether a object has been deleted.
exportJson() → Future<List<Map<String, dynamic>>>
Export the results of this query as json.
exportJsonRaw<R>(R callback(Uint8List)) → Future<R>
Export the results of this query as json bytes.
exportJsonRawSync<R>(R callback(Uint8List)) → R
Export the results of this query as json bytes.
exportJsonSync() → List<Map<String, dynamic>>
Export the results of this query as json.
findAll() → Future<List<T>>
Find all objects that match this query.
findAllSync() → List<T>
Find all objects that match this query.
findFirst() → Future<T?>
Find the first object that matches this query or null if no object matches.
findFirstSync() → T?
Find the first object that matches this query or null if no object matches.
isEmpty() → Future<bool>
Returns true if there are no objects that match this query.
isEmptySync() → bool
Returns true if there are no objects that match this query.
isNotEmpty() → Future<bool>
Returns true if there are objects that match this query.
isNotEmptySync() → bool
Returns true if there are objects that match this query.
max() → Future<DateTime?>

Available on Query<T>, provided by the QueryDateAggregation extension

Returns the maximum value of this query.
max() → Future<T?>

Available on Query<T?>, provided by the QueryAggregation extension

Returns the maximum value of this query.
maxSync() → DateTime?

Available on Query<T>, provided by the QueryDateAggregation extension

Returns the maximum value of this query.
maxSync() → T?

Available on Query<T?>, provided by the QueryAggregation extension

Returns the maximum value of this query.
min() → Future<DateTime?>

Available on Query<T>, provided by the QueryDateAggregation extension

Returns the minimum value of this query.
min() → Future<T?>

Available on Query<T?>, provided by the QueryAggregation extension

Returns the minimum value of this query.
minSync() → DateTime?

Available on Query<T>, provided by the QueryDateAggregation extension

Returns the minimum value of this query.
minSync() → T?

Available on Query<T?>, provided by the QueryAggregation extension

Returns the minimum value of this query.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
sum() → Future<T>

Available on Query<T?>, provided by the QueryAggregation extension

Returns the sum of all values of this query.
sumSync() → T

Available on Query<T?>, provided by the QueryAggregation extension

Returns the sum of all values of this query.
toString() → String
A string representation of this object.
inherited
watch({bool fireImmediately = false}) → Stream<List<T>>
Create a watcher that yields the results of this query whenever its results have (potentially) changed.
watchLazy({bool fireImmediately = false}) → Stream<void>
Watch the query for changes. If fireImmediately is true, an event will be fired immediately.

Operators

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

Constants

epsilon → const double
The default precision for floating point number queries.