harmony 鸿蒙DataAbility Lifecycle

2023-02-03
浏览 (570)

DataAbility Lifecycle

You can override lifecycle callbacks (described in the table below) for a DataAbility based on service requirements.

Table 1 DataAbility lifecycle APIs

API	Description
onInitialized?(info: AbilityInfo): void	Called during ability initialization to initialize the relational database (RDB).
update?(uri: string, valueBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void	Updates data in the database.
query?(uri: string, columns: Array<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<ResultSet>): void	Queries data in the database.
delete?(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void	Deletes one or more data records from the database.
normalizeUri?(uri: string, callback: AsyncCallback<string>): void	Normalizes the URI. A normalized URI applies to cross-device use, persistence, backup, and restore. When the context changes, it ensures that the same data item can be referenced.
batchInsert?(uri: string, valueBuckets: Array<rdb.ValuesBucket>, callback: AsyncCallback<number>): void	Inserts multiple data records into the database.
denormalizeUri?(uri: string, callback: AsyncCallback<string>): void	Converts a normalized URI generated by normalizeUri into a denormalized URI.
insert?(uri: string, valueBucket: rdb.ValuesBucket, callback: AsyncCallback<number>): void	Inserts a data record into the database.
openFile?(uri: string, mode: string, callback: AsyncCallback<number>): void	Opens a file.
getFileTypes?(uri: string, mimeTypeFilter: string, callback: AsyncCallback<Array<string>>): void	Obtains the MIME type of a file.
getType?(uri: string, callback: AsyncCallback<string>): void	Obtains the MIME type matching the data specified by the URI.
executeBatch?(ops: Array<DataAbilityOperation>, callback: AsyncCallback<Array<DataAbilityResult>>): void	Operates data in the database in batches.
call?(method: string, arg: string, extras: PacMap, callback: AsyncCallback<PacMap>): void	Calls a custom API.

你可能感兴趣的鸿蒙文章

harmony 鸿蒙Application Models

harmony 鸿蒙Using Explicit Want to Start an Application Component

harmony 鸿蒙Using Implicit Want to Open a Website

harmony 鸿蒙AbilityStage Component Container

harmony 鸿蒙Accessing a DataAbility

harmony 鸿蒙Accessing a DataShareExtensionAbility from the FA Model

harmony 鸿蒙AccessibilityExtensionAbility

harmony 鸿蒙Common action and entities Values

harmony 鸿蒙API Switching Overview

harmony 鸿蒙Switching of app and deviceConfig

0 赞

所属分类： 后端技术
本文标签：
版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/7c0231235b76424982efd0f3456afcad

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙初识ArkTS语言
6、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
7、 flink kafka connector scan.startup.mode 的几个选项
8、 golang
9、 openharmony
10、 Vue中input框自动聚焦

Loading...