js-apis-settings.md

# Settings

> **NOTE**<br>
> The initial APIs of this module are supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.


This module provides APIs for setting data items.


## Modules to Import

```typescript
import settings from '@ohos.settings';
```



## settings.getUriSync

getUriSync(name: string): string

Obtains the URI of a data item.

**System capability**: SystemCapability.Applictaions.settings.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| name | string | Yes| Name of the target data item. Data items can be classified as follows:<br> <ul><li>Existing data items in the database, for example:<br></li> <ul><li>Brightness: 'settings.screen.brightness'<br> </li>  <li>Time format: 'settings.time.format'<br> </li></ul> <li>Custom data items</li></ul>|

**Return value**

| Type| Description|
| -------- | -------- |
| string | URI of the data item.|

**Example**

```typescript
 // Obtain the URI of a data item.
 let urivar = settings.getUriSync('settings.screen.brightness');  
```


## settings.getValueSync

getValueSync(dataAbilityHelper: DataAbilityHelper, name: string, defValue: string): string

Obtains the value of a data item.

**System capability**: SystemCapability.Applictaions.settings.Core

**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| dataAbilityHelper | [DataAbilityHelper](js-apis-dataAbilityHelper.md) | Yes| **DataAbilityHelper** class.|
| name | string | Yes| Name of the target data item. Data items can be classified as follows:<br> <ul><li>Existing data items in the database, for example:<br></li> <ul><li>Brightness: 'settings.screen.brightness'<br> </li>  <li>Time format: 'settings.time.format'<br> </li></ul> <li>Custom data items</li></ul>|
| defValue | string | Yes| Default value This parameter is user-defined. If it is not found in the database, the default value is returned.|

**Return value**

| Type| Description|
| -------- | -------- |
| string | Value of the data item.|

**Example**

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

// Obtain the value of 'settings.screen.brightness' (this data item already exists in the database).
let brightness = 'settings.screen.brightness';
let uri = settings.getUriSync(brightness);
let helper = featureAbility.acquireDataAbilityHelper(uri);
let value = settings.getValueSync(helper, brightness, '10');
```


## settings.setValueSync

setValueSync(dataAbilityHelper: DataAbilityHelper, name: string, value: string): boolean

Sets the value of a data item.

If the specified data item exists in the database, the **setValueSync** method updates the value of the data item. If the data item does not exist in the database, the **setValueSync** method inserts the data item into the database.

**Required permissions**: ohos.permission.WRITE_SYSTEM_SETTING

**System capability**: SystemCapability.Applictaions.settings.Core

**Parameters**

| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| dataAbilityHelper | [DataAbilityHelper](js-apis-dataAbilityHelper.md) | Yes| **DataAbilityHelper** class.|
| name | string | Yes| Name of the target data item. Data items can be classified as follows:<br> <ul><li>Existing data items in the database, for example:<br></li> <ul><li>Brightness: 'settings.screen.brightness'<br> </li>  <li>Time format: 'settings.time.format'<br> </li></ul> <li>Custom data items</li></ul>|
| value | string | Yes| Value of the data item.|

**Return value**

| Type| Description|
| -------- | -------- |
| boolean | Result indicating whether the value is set successfully. Returns **true** if the value is set successfully; returns **false** otherwise.|

**Example**

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

// Update the value of 'settings.screen.brightness'. (As this data item exists in the database, the setValueSync 
   method will update the value of the data item.)
let brightness = 'settings.screen.brightness';
let uri = settings.getUriSync(brightness);
let helper = featureAbility.acquireDataAbilityHelper(uri);
let ret = settings.setValueSync(helper, brightness, '100');
```