updated docs

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

en/application-dev/reference/apis/Readme-EN.md

@@ -3,6 +3,7 @@
 - Ability Framework
     -   [FeatureAbility Module](js-apis-featureAbility.md)
     -   [ParticleAbility Module](js-apis-particleAbility.md)
+    -   [DataAbilityHelper Module](js-apis-dataAbilityHelper.md)
     -   [DataUriUtils Module](js-apis-DataUriUtils.md)
     -   [Context Module](js-apis-Context.md)
 - Event Notification

en/application-dev/reference/apis/js-apis-dataAbilityHelper.md

+### DataAbilityHelper Module (JavaScript SDK APIs)
+
+#### Applicable Devices
+
+| API                                                          | Phone| Tablet| Smart TV| Wearable| Lite Wearable| SmartVision Device|
+| ------------------------------------------------------------ | ---- | ---- | ------ | -------- | -------------- | ------------ |
+| DataAbilityHelper.openFile(uri: string, mode: string, callback: AsyncCallback\<number>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.openFile(uri: string, mode: string)        | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.on(type: 'dataChange', uri: string, callback: AsyncCallback\<void>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.off(type: 'dataChange', uri: string, callback?: AsyncCallback\<void>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.getFileTypes(uri: string, mimeTypeFilter: string, callback: AsyncCallback<Array\<string>>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.getFileTypes(uri: string, mimeTypeFilter: string) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.getType(uri: string, callback: AsyncCallback\<string>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.getType(uri: string)                       | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.normalizeUri(uri: string, callback: AsyncCallback\<string>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.normalizeUri(uri: string)                  | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.denormalizeUri(uri: string, callback: AsyncCallback\<string>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.denormalizeUri(uri: string)                | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.notifyChange(uri: string, callback: AsyncCallback\<void>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.notifyChange(uri: string)                  | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.insert(uri: string, valuesBucket: rdb.ValuesBucket, callback: AsyncCallback\<number>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.insert(uri: string, valuesBucket: rdb.ValuesBucket) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.batchInsert(uri: string, valuesBuckets: Array<rdb.ValuesBucket>, callback: AsyncCallback\<number>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.batchInsert(uri: string, valuesBuckets: Array<rdb.ValuesBucket>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.delete(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<number>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.delete(uri: string, predicates: dataAbility.DataAbilityPredicates) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.update(uri: string, valuesBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<number>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.update(uri: string, valuesBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.query(uri: string, columns: Array\<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<ResultSet>) | Yes| Yes| Yes| Yes| No| No|
+| DataAbilityHelper.query(uri: string, columns: Array\<string>, predicates: dataAbility.DataAbilityPredicates) | Yes| Yes| Yes| Yes| No| No|
+
+#### Modules to Import
+
+```
+import featureAbility from '@ohos.ability.featureAbility'
+import ohos_data_ability from '@ohos.data.dataability'
+import ohos_data_rdb from '@ohos.data.rdb'
+```
+
+#### DataAbilityHelper.openFile(uri: string, mode: string, callback: AsyncCallback\<number>)
+
+- Functionality
+
+  Opens a file with a specified URI. This method uses a callback to return the result.
+
+
+* Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | -------------------- | ---- | ------------------------ |
+  | uri      | Read-only| string               | Yes| URI of the file to open.|
+  | mode     | Read-only| string               | Yes| Mode for opening the file. The value can be **rwt**.|
+  | callback | Read-only| AsyncCallback\<void> | Yes| Callback used to return the result.|
+
+* Return values
+
+  Returns a file descriptor.
+
+* Example
+
+```javascript
+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(uri: string, mode: string)
+
+- Functionality
+
+  Opens a file with a specified URI. This method uses a promise to return the result.
+
+* Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---- | -------- | ------ | ---- | ------------------------ |
+  | uri  | Read-only| string | Yes| URI of the file to open.|
+  | mode | Read-only| string | Yes| Mode for opening the file. The value can be **rwt**.|
+
+* Return values
+
+  Returns a file descriptor.
+
+* Example
+
+```javascript
+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((void) => {
+		console.info("==========================>openFileCallback=======================>");
+});
+```
+
+#### DataAbilityHelper.on(type: 'dataChange', uri: string, callback: AsyncCallback\<void>)
+
+- Functionality
+
+  Registers an observer to observe data specified by a given URI. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | -------------------- | ---- | ------------------------ |
+  | type     | Read-only| string               | Yes| Type of the event to observe. The value is **dataChange**.|
+  | uri      | Read-only| string               | Yes| URI of the data.|
+  | callback | Read-only| AsyncCallback\<void> | Yes| Callback invoked when the data is changed.|
+
+- Return value
+
+  void
+
+- Example
+
+```js
+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(type: 'dataChange', uri: string, callback?: AsyncCallback\<void>)
+
+- Functionality
+
+  Unregisters the observer used to observe data specified by a given URI. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | -------------------- | ---- | ------------------------ |
+  | type     | Read-only| string               | Yes| Type of the event to observe. The value is **dataChange**.|
+  | uri      | Read-only| string               | Yes| URI of the data.|
+  | callback | Read-only| AsyncCallback\<void> | No| Callback used to return the result.|
+
+- Return value
+
+  void
+
+- Example
+
+```js
+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(uri: string, callback: AsyncCallback\<string>)
+
+- Functionality
+
+  Obtains the MIME type of the data specified by a given URI. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | ---------------------- | ---- | ------------------------ |
+  | uri      | Read-only| string                 | Yes| URI of the data.|
+  | callback | Read-only| AsyncCallback\<string> | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the MIME type that matches the data specified by the URI.
+
+- Example
+
+```js
+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(uri: string)
+
+- Functionality
+
+  Obtains the MIME type of the data specified by a given URI. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---- | -------- | ------ | ---- | ------------------------ |
+  | uri  | Read-only| string | Yes| URI of the data.|
+
+- Return value
+
+  Returns the MIME type that matches the data specified by the URI.
+
+- Example
+
+```js
+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(uri: string, mimeTypeFilter: string, callback: AsyncCallback<Array\<string>>)
+
+- Functionality
+
+  Obtains the supported MIME types of a specified file. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------------- | -------- | ------------------------------ | ---- | ---------------------------- |
+  | uri            | Read-only| string                         | Yes| URI of the file.|
+  | mimeTypeFilter | Read-only| string                         | Yes| MIME type of the file.|
+  | callback       | Read-only| AsyncCallback\<Array\<string>> | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns a MIME type array.
+
+- Example
+
+```js
+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(uri: string, mimeTypeFilter: string)
+
+- Functionality
+
+  Obtains the supported MIME types of a specified file. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------------- | -------- | ------ | ---- | ---------------------------- |
+  | uri            | Read-only| string | Yes| URI of the file.|
+  | mimeTypeFilter | Read-only| string | Yes| MIME type of the file.|
+
+- Return value
+
+  Returns a MIME type array.
+
+- Example
+
+```js
+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(uri: string, callback: AsyncCallback\<string>)
+
+- Functionality
+
+  Converts the URI that refers to a Data ability into a normalized URI. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | ---------------------- | ---- | ----------------------- |
+  | uri      | Read-only| string                 | Yes| URI object to normalize.|
+  | callback | Read-only| AsyncCallback\<string> | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the normalized URI object if the Data ability supports URI normalization; returns **null** otherwise.
+
+- Example
+
+```js
+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(uri: string)
+
+- Functionality
+
+  Converts the URI that refers to a Data ability into a normalized URI. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---- | -------- | ------ | ---- | ----------------------- |
+  | uri  | Read-only| string | Yes| URI object to normalize.|
+
+- Return value
+
+  Returns the normalized URI object if the Data ability supports URI normalization; returns **null** otherwise.
+
+- Example
+
+```js
+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(uri: string, callback: AsyncCallback\<string>)
+
+- Functionality
+
+  Converts a normalized URI generated by **DataAbilityHelper.normalizeUri(uri: string, callback: AsyncCallback\<string>)** to a denormalized one. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | ---------------------- | ---- | ----------------------- |
+  | uri      | Read-only| string                 | Yes| URI object to denormalize.|
+  | callback | Read-only| AsyncCallback\<string> | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the denormalized URI object.
+
+- Example
+
+```js
+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(uri: string)
+
+- Functionality
+
+  Converts a normalized URI generated by **DataAbilityHelper.normalizeUri(uri: string)** to a denormalized one. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---- | -------- | ------ | ---- | ----------------------- |
+  | uri  | Read-only| string | Yes| URI object to denormalize.|
+
+- Return value
+
+  Returns the denormalized URI object.
+
+- Example
+
+```js
+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(uri: string, callback: AsyncCallback\<void>)
+
+- Functionality
+
+  Notifies the registered observer of a change to the data specified by the URI. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | -------- | -------- | -------------------- | ---- | ------------------------ |
+  | uri      | Read-only| string               | Yes| URI of the data.|
+  | callback | Read-only| AsyncCallback\<void> | Yes| Callback used to return the result.|
+
+- Return value
+
+  void
+
+- Example
+
+```js
+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(uri: string)
+
+- Functionality
+
+  Notifies the registered observer of a change to the data specified by the URI. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---- | -------- | ------ | ---- | ------------------------ |
+  | uri  | Read-only| string | Yes| URI of the data.|
+
+- Return value
+
+  void
+
+- Example
+
+```js
+import featureAbility from '@ohos.ability.featureAbility'
+var DAHelper = featureAbility.acquireDataAbilityHelper(
+    "dataability:///com.example.DataAbility"
+);
+DAHelper.notifyChange(
+    "dataability:///com.example.DataAbility",
+	).then((void) => {
+		console.info("==========================>notifyChangeCallback=======================>");
+});
+```
+
+#### DataAbilityHelper.insert(uri: string, valuesBucket: rdb.ValuesBucket, callback: AsyncCallback\<number>)
+
+- Functionality
+
+  Inserts a single data record into the database. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | ---------------------- | ---- | ------------------------------------------------------ |
+  | uri          | Read-only| string                 | Yes| URI of the data to insert.|
+  | valuesBucket | Read-only| rdb.ValuesBucket       | Yes| Data record to insert. If this parameter is **null**, a blank row will be inserted.|
+  | callback     | Read-only| AsyncCallback\<number> | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the index of the inserted data record.
+
+- Example
+
+```js
+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(uri: string, valuesBucket: rdb.ValuesBucket)
+
+- Functionality
+
+  Inserts a single data record into the database. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | ---------------- | ---- | ------------------------------------------------------ |
+  | uri          | Read-only| string           | Yes| URI of the data to insert.|
+  | valuesBucket | Read-only| rdb.ValuesBucket | Yes| Data record to insert. If this parameter is **null**, a blank row will be inserted.|
+
+- Return value
+
+  Returns the index of the inserted data record.
+
+- Example
+
+```js
+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(uri: string, valuesBuckets: Array<rdb.ValuesBucket>, callback: AsyncCallback\<number>)
+
+- Functionality
+
+  Inserts multiple data records into the database. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | ----------------------- | ---- | ------------------------ |
+  | uri          | Read-only| string                  | Yes| URI of the data to insert.|
+  | valuesBucket | Read-only| Array<rdb.ValuesBucket> | Yes| Data records to insert.|
+  | callback     | Read-only| AsyncCallback\<number>  | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the number of inserted data records.
+
+- Example
+
+```js
+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(uri: string, valuesBuckets: Array<rdb.ValuesBucket>)
+
+- Functionality
+
+  Inserts multiple data records into the database. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | ----------------------- | ---- | ------------------------ |
+  | uri          | Read-only| string                  | Yes| URI of the data to insert.|
+  | valuesBucket | Read-only| Array<rdb.ValuesBucket> | Yes| Data records to insert.|
+
+- Return value
+
+  Returns the number of inserted data records.
+
+- Example
+
+```js
+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(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<number>)
+
+- Functionality
+
+  Deletes one or more data records from the database. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri          | Read-only| string                            | Yes| URI of the data to delete.|
+  | valuesBucket | Read-only| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+  | callback     | Read-only| AsyncCallback\<number>            | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the number of deleted data records.
+
+- Example
+
+```js
+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(uri: string, predicates: dataAbility.DataAbilityPredicates)
+
+- Functionality
+
+  Deletes one or more data records from the database. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri          | Read-only| string                            | Yes| URI of the data to delete.|
+  | valuesBucket | Read-only| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+
+- Return value
+
+  Returns the number of deleted data records.
+
+- Example
+
+```js
+import featureAbility from '@ohos.ability.featureAbility'
+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(uri: string, valuesBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<number>)
+
+- Functionality
+
+  Updates data records in the database. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri          | Read-only| string                            | Yes| URI of the data to update.|
+  | valuesBucket | Read-only| rdb.ValuesBucket                  | Yes| New values.|
+  | predicates   | Read-only| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+  | callback     | Read-only| AsyncCallback\<number>            | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the number of updated data records.
+
+- Example
+
+```js
+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(uri: string, valuesBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates)
+
+- Functionality
+
+  Updates data records in the database. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ------------ | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri          | Read-only| string                            | Yes| URI of the data to update.|
+  | valuesBucket | Read-only| rdb.ValuesBucket                  | Yes| New values.|
+  | predicates   | Read-only| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+
+- Return value
+
+  Returns the number of updated data records.
+
+- Example
+
+```js
+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(uri: string, columns: Array\<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback\<ResultSet>)
+
+- Functionality
+
+  Queries data in the database. This method uses a callback to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---------- | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri        | Read-only| string                            | Yes| URI of the data to query.|
+  | columns    | Read-only| rdb.ValuesBucket                  | Yes| Columns to query. If this parameter is **null**, all columns will be queried.|
+  | predicates | Read-only| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+  | callback   | Read-only| AsyncCallback\<ResultSet>         | Yes| Callback used to return the result.|
+
+- Return value
+
+  Returns the data queried.
+
+- Example
+
+```js
+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(uri: string, columns: Array\<string>, predicates: dataAbility.DataAbilityPredicates)
+
+- Functionality
+
+  Queries data in the database. This method uses a promise to return the result.
+
+- Parameters
+
+  | Name| Readable/Writable| Type| Mandatory| Description|
+  | ---------- | -------- | --------------------------------- | ---- | ------------------------------------------------ |
+  | uri        | Readable and writable| string                            | Yes| URI of the data to query.|
+  | columns    | Readable and writable| rdb.ValuesBucket                  | Yes| Columns to query. If this parameter is **null**, all columns will be queried.|
+  | predicates | Readable and writable| dataAbility.DataAbilityPredicates | Yes| Filter criteria. You should define the processing logic when this parameter is **null**.|
+
+- Return value
+
+  Returns the data queried.
+
+- Example
+
+```js
+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=======================>");
+});
+```