Query<InstanceType extends ManagedObject> class Null safety

An object for configuring and executing a database query.

Queries are used to fetch, update, insert, delete and count InstanceTypes in a database. InstanceType must be a ManagedObject.

    final query = Query<Employee>()
      ..where((e) => e.salary).greaterThan(50000);
    final employees = await query.fetch();

Implementers

QueryMixin

Constructors

Query(ManagedContext context, {InstanceType? values}): Creates a new Query.
factory
Query.forEntity(ManagedEntity entity, ManagedContext context): Creates a new Query without a static type.
factory

Properties

canModifyAllInstances ↔ bool: Confirms that a query has no predicate before executing it.
read / write
context → ManagedContext: The ManagedContext this query will be executed on.
read-only
entity → ManagedEntity: The ManagedEntity of the InstanceType.
read-only
fetchLimit ↔ int: Limits the number of objects returned from the Query.
read / write
hashCode → int: The hash code for this object.
read-onlyinherited
offset ↔ int: Offsets the rows returned.
read / write
predicate ↔ QueryPredicate?: A predicate for filtering the result or operation set.
read / write
reduce → QueryReduceOperation<InstanceType>: Returns a new object that can execute functions like sum, average, maximum, etc.
read-only
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited
timeoutInSeconds ↔ int: Number of seconds before a Query times out.
read / write
valueMap ↔ Map<String, dynamic>?: Values to be used when inserting or updating an object.
read / write
values ↔ InstanceType: Values to be sent to database during an update or insert query.
read / write

Methods

delete() → Future<int?>: Deletes InstanceTypes from the underlying database.
fetch() → Future<List<InstanceType>>: Fetches InstanceTypes from the database.
fetchOne() → Future<InstanceType?>: Fetches a single InstanceType from the database.
insert() → Future<InstanceType>: Inserts an InstanceType into the underlying database.
insertMany(List<InstanceType> objects) → Future<List<InstanceType>>: Inserts an InstanceTypes into the underlying database.
join<T extends ManagedObject>({T? object(InstanceType x)?, ManagedSet<T>? set(InstanceType x)?}) → Query<T>: Configures this instance to fetch a relationship property identified by object or set.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed.
inherited
pageBy<T>(T propertyIdentifier(InstanceType x), QuerySortOrder order, {T? boundingValue}) → void: Configures this instance to fetch a section of a larger result set.
returningProperties(List propertyIdentifiers(InstanceType x)) → void: Configures the list of properties to be fetched for InstanceType.
sortBy<T>(T propertyIdentifier(InstanceType x), QuerySortOrder order) → void: Configures this instance to sort its results by some property and order.
toString() → String: A string representation of this object.
inherited
update() → Future<List<InstanceType>>: Updates InstanceTypes in the underlying database.
updateOne() → Future<InstanceType?>: Updates an InstanceType in the underlying database.
where<T>(T propertyIdentifier(InstanceType x)) → QueryExpression<T, InstanceType>: Selects a property from the object being queried to add a filtering expression.

Operators

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

Static Methods

insertObject<T extends ManagedObject>(ManagedContext context, T object) → Future<T>: Inserts a single object into the database managed by context.
insertObjects<T extends ManagedObject>(ManagedContext context, List<T> objects) → Future<List<T>>: Inserts each object in objects into the database managed by context in a single transaction.