程序包 ohos.data.orm

类 OrmDatabase

java.lang.Object

ohos.data.orm.OrmDatabase

public abstract class OrmDatabase
extends Object

Represents object databases.

An object relational mapping (ORM) database class corresponds to a relational database. Before using an ORM database, you need to create a database class that inherits from OrmDatabase and annotate it with @Database.

从以下版本开始:

1

另请参阅:

OrmObject

SystemCapability

SystemCapability.Data#DATA_APPDATAMGR

构造器概要

构造器

构造器	说明
OrmDatabase()

方法概要

限定符和类型	方法	说明
void	corruptionHandler(File databaseFile)	Called when a corruption exception occurs when the ORM database is opened.
abstract RdbOpenCallback	getHelper()	Obtains the RdbOpenCallback instance for creating a relational database that corresponds to the current object database.
abstract int	getVersion()	Obtains the database version.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

OrmDatabase

public OrmDatabase()

方法详细资料

getVersion

public abstract int getVersion()

Obtains the database version.

If you have specified the database version in the @Database annotation, the ORM annotation processor will automatically implement and invoke this method during compilation. In this case, your application does not need to implement and invoke this method.

返回:

Returns the database version.

从以下版本开始:

1

getHelper

public abstract RdbOpenCallback getHelper()

Obtains the RdbOpenCallback instance for creating a relational database that corresponds to the current object database.

If you have specified the implementation class of OrmMigration in DatabaseHelper.getOrmContext(java.lang.String, java.lang.String, java.lang.Class<T>, ohos.data.orm.OrmMigration...), the ORM annotation processor will automatically read the database version and the implementation class, and generate an instance for creating a relational database that corresponds to the current object database. In this case, your application does not need to implement and invoke this method.

返回:

Returns the RdbOpenCallback instance for creating the relational database.

从以下版本开始:

1

另请参阅:

OrmMigration

corruptionHandler

public void corruptionHandler(File databaseFile)

Called when a corruption exception occurs when the ORM database is opened.

参数:

databaseFile - the file object representing the database on which corruption is detected.

从以下版本开始:

4