WriteBatch class
A WriteBatch is a series of write operations to be performed as one unit.
Operations done on a WriteBatch do not take effect until you commit().
Once committed, no further operations can be performed on the WriteBatch, nor can it be committed again.
Operations are added to a WriteBatch through a DatabaseReference object
that is returned from WriteBatch.reference. The DatabaseReference
object behaves similarly to the DatabaseReference instance that is returned
from FirebaseDatabase.reference. All writes performed on that reference
through the DatabaseReference.set, DatabaseReference.update, and
DatabaseReference.remove methods are recorded on the WriteBatch. None of
these writes are visible to other clients until WriteBatch.commit is
called. They are however immediataley visible to all DatabaseReference and
Query objects that are created from WriteBatch.reference.
Note that in some cases, queries might not return the results you expect when used with a WriteBatch. This can happen when you write to a location that was not part of the query result, but should be after the write. Or the other way around. For example, if you query the first 2 children of a location, but the write batch contains a removal of the first child, the query will only return the second child, even when there are actually more than 2 children at that location. This might be fixed in a future version.
Constructors
- WriteBatch(DatabaseReference ref)
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
commit(
) → Future< void> -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
reference(
) → DatabaseReference -
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited