程序包 ohos.data.orm

接口 OrmObjectObserver

public interface OrmObjectObserver

Represents the observer of object relational mapping (ORM) databases.

If you want to listen for data changes in an ORM database, call the registration interface provided in OrmContext to register an observer, and then specify the callback for receiving the change content as needed.

从以下版本开始:

1

另请参阅:

OrmContext

SystemCapability

SystemCapability.Data#DATA_APPDATAMGR

方法概要

限定符和类型	方法	说明
void	onChange(OrmContext changeContext, AllChangeToTarget subAllChange)	Callback invoked when data changes.

方法详细资料

onChange

void onChange(OrmContext changeContext,
              AllChangeToTarget subAllChange)

Callback invoked when data changes.

This callback is used to receive the database context and the change content.

参数:

changeContext - Indicates the database context after the change.

subAllChange - Indicates the change content, including the list of objects that are inserted, updated, or deleted.

从以下版本开始:

1

另请参阅:

OrmContext, AllChangeToTarget