1e41f4b71Sopenharmony_ci# DataAbility的生命周期 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci应用开发者可以根据业务场景实现data.js/data.ets中的生命周期相关接口。DataAbility生命周期接口说明见下表。 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ci 7e41f4b71Sopenharmony_ci **表1** DataAbility相关生命周期API功能介绍 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci| 接口名 | 描述 | 10e41f4b71Sopenharmony_ci| -------- | -------- | 11e41f4b71Sopenharmony_ci| onInitialized?(info: AbilityInfo): void | 在Ability初始化调用，通过此回调方法执行RDB等初始化操作。 | 12e41f4b71Sopenharmony_ci| update?(uri: string, valueBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void | 更新数据库中的数据。 | 13e41f4b71Sopenharmony_ci| query?(uri: string, columns: Array<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<ResultSet>): void | 查询数据库中的数据。 | 14e41f4b71Sopenharmony_ci| delete?(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void | 删除一条或多条数据。 | 15e41f4b71Sopenharmony_ci| normalizeUri?(uri: string, callback: AsyncCallback<string>): void | 对URI进行规范化。一个规范化的URI可以支持跨设备使用、持久化、备份和还原等，当上下文改变时仍然可以引用到相同的数据项。 | 16e41f4b71Sopenharmony_ci| batchInsert?(uri: string, valueBuckets: Array<rdb.ValuesBucket>, callback: AsyncCallback<number>): void | 向数据库中插入多条数据。 | 17e41f4b71Sopenharmony_ci| denormalizeUri?(uri: string, callback: AsyncCallback<string>): void | 将一个由normalizeUri生产的规范化URI转换成非规范化的URI。 | 18e41f4b71Sopenharmony_ci| insert?(uri: string, valueBucket: rdb.ValuesBucket, callback: AsyncCallback<number>): void | 向数据中插入一条数据。 | 19e41f4b71Sopenharmony_ci| openFile?(uri: string, mode: string, callback: AsyncCallback<number>): void | 打开一个文件。 | 20e41f4b71Sopenharmony_ci| getFileTypes?(uri: string, mimeTypeFilter: string, callback: AsyncCallback<Array<string>>): void | 获取文件的MIME类型。 | 21e41f4b71Sopenharmony_ci| getType?(uri: string, callback: AsyncCallback<string>): void | 获取URI指定数据相匹配的MIME类型。 | 22e41f4b71Sopenharmony_ci| executeBatch?(ops: Array<DataAbilityOperation>, callback: AsyncCallback<Array<DataAbilityResult>>): void | 批量操作数据库中的数据。 | 23e41f4b71Sopenharmony_ci| call?(method: string, arg: string, extras: PacMap, callback: AsyncCallback<PacMap>): void | 自定义方法。 | 24