CursorWithValue class Null safety

represents a cursor for traversing or iterating over multiple records in a database. It is the same as the Cursor, except that it includes the value property.

The cursor has a source that indicates which index or object store it is iterating over. It has a position within the range, and moves in a direction that is increasing or decreasing in the order of record keys. The cursor enables an application to asynchronously process all the records in the cursor's range.

You can have an unlimited number of cursors at the same time. You always get the same CursorWithValue object representing a given cursor. Operations are performed on the underlying index or object store.

Inheritance

Constructors

CursorWithValue()

Properties

direction String
returns the direction of traversal of the cursor (set using ObjectStore.openCursor for example). [...]
read-only, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
key Object
returns the key for the record at the cursor's position. If the cursor is outside its range, this is set to undefined. The cursor's key can be any data type [...]
read-only, inherited
primaryKey Object
returns the cursor's current effective key. If the cursor is currently being iterated or has iterated outside its range, this is set to undefined. The cursor's primary key can be any data type. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
value Object
Returns the value of the current cursor.
read-only

Methods

advance(int count) → void
sets the number times a cursor should move its position forward.
inherited
delete() Future<void>
deletes the record at the cursor's position, without changing the cursor's position. Once the record is deleted, the cursor's value is set to null.
inherited
next() → void
advances the cursor to the next position along its direction, to the item whose key matches the optional key parameter. If no key is specified, the cursor advances to the immediate next position, based on the its direction.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toString() String
A string representation of this object. [...]
inherited
update(Object value) Future<void>
updates the value at the current position of the cursor in the object store. If the cursor points to a record that has just been deleted, a new record is created.
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited