DataAbilityHelper

NOTE

The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version. The APIs of this module can be used only in the FA model.

Usage

Import the following modules based on the actual situation before using the current module:

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
import ohos_data_rdb from '@ohos.data.rdb'

DataAbilityHelper.openFile

openFile(uri: string, mode: string, callback: AsyncCallback<number>): void

Opens a file with a specified URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var mode = "rwt";
DAHelper.openFile(
    "dataability:///com.example.DataAbility",
    mode,
    (err) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.openFile

openFile(uri: string, mode: string): Promise<number>

Opens a file with a specified URI. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var mode = "rwt";
DAHelper.openFile(
    "dataability:///com.example.DataAbility",
    mode).then((data) => {
		console.info("==========================>openFileCallback=======================>");
});

DataAbilityHelper.on

on(type: ‘dataChange’, uri: string, callback: AsyncCallback<void>): void

Registers an observer to observe data specified by a given URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var helper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
function onChangeNotify() {
    console.info("==========================>onChangeNotify=======================>");
};
helper.on(
    "dataChange",
    "dataability:///com.example.DataAbility",
    onChangeNotify
)

DataAbilityHelper.off

off(type: ‘dataChange’, uri: string, callback?: AsyncCallback<void>): void

Deregisters the observer used to observe data specified by a given URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var helper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
function onChangeNotify() {
    console.info("==========================>onChangeNotify=======================>");
};
helper.off(
    "dataChange",
    "dataability:///com.example.DataAbility",
)
helper.off(
    "dataChange",
    "dataability:///com.example.DataAbility",
    onChangeNotify
)

DataAbilityHelper.getType

getType(uri: string, callback: AsyncCallback<string>): void

Obtains the MIME type of the data specified by a given URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.getType(
    "dataability:///com.example.DataAbility",
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.getType

getType(uri: string): Promise<string>

Obtains the MIME type of the data specified by a given URI. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.getType(
    "dataability:///com.example.DataAbility"
	).then((data) => {
		console.info("==========================>getTypeCallback=======================>");
});

DataAbilityHelper.getFileTypes

getFileTypes(uri: string, mimeTypeFilter: string, callback: AsyncCallback>): void

Obtains the supported MIME types of a specified file. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.getFileTypes(
    "dataability:///com.example.DataAbility",
    "image/*",
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.getFileTypes

getFileTypes(uri: string, mimeTypeFilter: string): Promise<Array<string>>

Obtains the supported MIME types of a specified file. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.getFileTypes(
    "dataability:///com.example.DataAbility",
    "image/*"
	).then((data) => {
		console.info("==========================>getFileTypesCallback=======================>");
});

DataAbilityHelper.normalizeUri

normalizeUri(uri: string, callback: AsyncCallback<string>): void

Converts the URI that refers to a Data ability into a normalized URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.normalizeUri(
    "dataability:///com.example.DataAbility",
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.normalizeUri

normalizeUri(uri: string): Promise<string>

Converts the URI that refers to a Data ability into a normalized URI. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.normalizeUri(
    "dataability:///com.example.DataAbility",
	).then((data) => {
		console.info("==========================>normalizeUriCallback=======================>");
});

DataAbilityHelper.denormalizeUri

denormalizeUri(uri: string, callback: AsyncCallback<string>): void

Converts a normalized URI generated by DataAbilityHelper.normalizeUri(uri: string, callback: AsyncCallback<string>) to a denormalized one. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.denormalizeUri(
    "dataability:///com.example.DataAbility",
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.denormalizeUri

denormalizeUri(uri: string): Promise<string>

Converts a normalized URI generated by DataAbilityHelper.normalizeUri(uri: string) to a denormalized one. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.denormalizeUri(
    "dataability:///com.example.DataAbility",
	).then((data) => {
		console.info("==========================>denormalizeUriCallback=======================>");
});

DataAbilityHelper.notifyChange

notifyChange(uri: string, callback: AsyncCallback<void>): void

Notifies the registered observer of a change to the data specified by the URI. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var helper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
helper.notifyChange(
    "dataability:///com.example.DataAbility",
    (err) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.notifyChange

notifyChange(uri: string): Promise<void>

Notifies the registered observer of a change to the data specified by the URI. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
DAHelper.notifyChange(
    "dataability:///com.example.DataAbility",
	).then(() => {
		console.info("==========================>notifyChangeCallback=======================>");
});

DataAbilityHelper.insert

insert(uri: string, valuesBucket: rdb.ValuesBucket, callback: AsyncCallback<number>): void

Inserts a single data record into the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
const valueBucket = {
    "name": "rose",
    "age": 22,
    "salary": 200.5,
    "blobType": "u8",
}
DAHelper.insert(
    "dataability:///com.example.DataAbility",
    valueBucket,
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.insert

insert(uri: string, valuesBucket: rdb.ValuesBucket): Promise<number>

Inserts a single data record into the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
const valueBucket = {
    "name": "rose1",
    "age": 221,
    "salary": 20.5,
    "blobType": "u8",
}
DAHelper.insert(
    "dataability:///com.example.DataAbility",
    valueBucket
	).then((data) => {
		console.info("==========================>insertCallback=======================>");
});

DataAbilityHelper.batchInsert

batchInsert(uri: string, valuesBuckets: Array, callback: AsyncCallback<number>): void

Inserts multiple data records into the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var cars = new Array({"name": "roe11", "age": 21, "salary": 20.5, "blobType": "u8",},
                     {"name": "roe12", "age": 21, "salary": 20.5, "blobType": "u8",},
                     {"name": "roe13", "age": 21, "salary": 20.5, "blobType": "u8",})
DAHelper.batchInsert(
    "dataability:///com.example.DataAbility",
    cars,
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.batchInsert

batchInsert(uri: string, valuesBuckets: Array): Promise<number>

Inserts multiple data records into the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var cars = new Array({"name": "roe11", "age": 21, "salary": 20.5, "blobType": "u8",},
                     {"name": "roe12", "age": 21, "salary": 20.5, "blobType": "u8",},
                     {"name": "roe13", "age": 21, "salary": 20.5, "blobType": "u8",})
DAHelper.batchInsert(
    "dataability:///com.example.DataAbility",
    cars
	).then((data) => {
		console.info("==========================>batchInsertCallback=======================>");
});

DataAbilityHelper.delete

delete(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void

Deletes one or more data records from the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.delete(
    "dataability:///com.example.DataAbility",
    da,
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.delete

delete(uri: string, predicates?: dataAbility.DataAbilityPredicates): Promise<number>;

Deletes one or more data records from the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.delete(
    "dataability:///com.example.DataAbility",
    da
	).then((data) => {
		console.info("==========================>deleteCallback=======================>");
});

DataAbilityHelper.update

update(uri: string, valuesBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void

Updates data records in the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
const va = {
    "name": "roe1",
    "age": 21,
    "salary": 20.5,
    "blobType": "u8",
}
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.update(
    "dataability:///com.example.DataAbility",
    va,
    da,
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.update

update(uri: string, valuesBucket: rdb.ValuesBucket, predicates?: dataAbility.DataAbilityPredicates): Promise<number>;

Updates data records in the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
const va = {
    "name": "roe1",
    "age": 21,
    "salary": 20.5,
    "blobType": "u8",
}
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.update(
    "dataability:///com.example.DataAbility",
    va,
    da
	).then((data) => {
		console.info("==========================>updateCallback=======================>");
});

DataAbilityHelper.query

query(uri: string, columns: Array<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<ResultSet>): void

Queries data in the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var cars=new Array("value1", "value2", "value3", "value4");
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.query(
    "dataability:///com.example.DataAbility",
    cars,
    da,
    (err, data) => {
		console.info("==========================>Called=======================>");
});

DataAbilityHelper.query

query(uri: string, columns?: Array<string>, predicates?: dataAbility.DataAbilityPredicates): Promise<ResultSet>;

Queries data in the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
var DAHelper = featureAbility.acquireDataAbilityHelper(
    "dataability:///com.example.DataAbility"
);
var cars=new Array("value1", "value2", "value3", "value4");
let da = new ohos_data_ability.DataAbilityPredicates()
DAHelper.query(
    "dataability:///com.example.DataAbility",
    cars,
    da
	).then((data) => {
		console.info("==========================>queryCallback=======================>");
});

DataAbilityHelper.call

call(uri: string, method: string, arg: string, extras: PacMap): Promise<PacMap>

Calls the extended API of the Data ability. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility';

let dataAbilityHelper = featureAbility.acquireDataAbilityHelper("dataability:///com.example.jsapidemo.UserDataAbility");
dataAbilityHelper.call("dataability:///com.example.jsapidemo.UserDataAbility", "method", "arg", {"key1":"value1"}).then((data) => {
    console.info('Operation succeeded: ' + data);
}).catch((error) => {
    console.error('Operation failed. Cause: ' + error);
});

DataAbilityHelper.call

call(uri: string, method: string, arg: string, extras: PacMap, callback: AsyncCallback<PacMap>): void

Calls the extended API of the Data ability. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility';

let dataAbilityHelper = featureAbility.acquireDataAbilityHelper("dataability:///com.example.jsapidemo.UserDataAbility");
dataAbilityHelper.call("dataability:///com.example.jsapidemo.UserDataAbility", "method", "arg", {"key1":"value1"}, (err, data) => {
    if (err) {
        console.error('Operation failed. Cause: ' + err);
        return;
    }
    console.info('Operation succeeded: ' + data);
});

DataAbilityHelper.executeBatch

executeBatch(uri: string, operations: Array<DataAbilityOperation>, callback: AsyncCallback<Array<DataAbilityResult>>): void;

Operates data in the database. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Example

import featureAbility from '@ohos.ability.featureAbility';

// Select the operations to be performed on the database according to the DataAbilityOperation array.
let op=new Array();
let dataAbilityHelper = featureAbility.acquireDataAbilityHelper("dataability:///com.example.jsapidemo.UserDataAbility");
dataAbilityHelper.executeBatch("dataability:///com.example.jsapidemo.UserDataAbility", op, (err, data) => {
    if (err) {
        console.error('Operation failed. Cause: ' + err);
        return;
    }
    console.info('Operation succeeded: ' + data);
});

DataAbilityHelper.executeBatch

executeBatch(uri: string, operations: Array<DataAbilityOperation>): Promise<Array<DataAbilityResult>>;

Operates data in the database. This API uses a promise to return the result.

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

Parameters

Return value

Example

import featureAbility from '@ohos.ability.featureAbility';

// Select the operations to be performed on the database according to the DataAbilityOperation array.
let op=new Array();
let dataAbilityHelper = featureAbility.acquireDataAbilityHelper("dataability:///com.example.jsapidemo.UserDataAbility");
dataAbilityHelper.executeBatch("dataability:///com.example.jsapidemo.UserDataAbility",op ).then((data) => {
    console.info('Operation succeeded: ' + data);
}).catch((error) => {
    console.error('Operation failed. Cause: ' + error);
});

PacMap

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

DataAbilityOperation

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

DataAbilityResult

System capability: SystemCapability.Ability.AbilityRuntime.FAModel

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