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!10508 [翻译完成】#I5R4ZF 

Merge pull request !10508 from Annie_wang/PR9458
上级 05be6c0b d67951d2
隐藏空白更改
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Showing with 265 addition and 57 deletion
en/application-dev/database/database-preference-guidelines.md
浏览文件 @ b7824fa3
......@@ -88,15 +88,22 @@ Use the following APIs to delete a **Preferences** instance or data file.
2. Obtain a **Preferences** instance.
Read the specified file and load its data to the **Preferences** instance for data operations.
FA model:
```js
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility'
var context = featureAbility.getContext()
let context = featureAbility.getContext();
let preferences = null;
let promise = data_preferences.getPreferences(context, 'mystore');
promise.then((pref) => {
preferences = pref;
}).catch((err) => {
console.info("Failed to get the preferences.");
})
```
Stage model:
......@@ -104,14 +111,21 @@ Use the following APIs to delete a **Preferences** instance or data file.
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability'
var context
class MainAbility extends Ability{
let context = null;
let preferences = null;
export default class MainAbility extends Ability {
onWindowStageCreate(windowStage){
context = this.context
context = this.context;
}
}
let promise = data_preferences.getPreferences(context, 'mystore');
promise.then((pref) => {
preferences = pref;
}).catch((err) => {
console.info("Failed to get the preferences.");
})
```
3. Write data.
......@@ -119,35 +133,27 @@ Use the following APIs to delete a **Preferences** instance or data file.
Use the **preferences.put()** method to write data to the **Preferences** instance.
```js
promise.then((preferences) => {
let putPromise = preferences.put('startup', 'auto');
putPromise.then(() => {
console.info("Put the value of 'startup' successfully.");
}).catch((err) => {
console.info("Failed to put the value of 'startup'. Cause: " + err);
})
let putPromise = preferences.put('startup', 'auto');
putPromise.then(() => {
console.info("Put the value of 'startup' successfully.");
}).catch((err) => {
console.info("Failed to get the preferences.");
console.info("Failed to put the value of 'startup'. Cause: " + err);
})
```
4. Read data.
Use the **preferences.get()** method to read data.
```js
promise.then((preferences) => {
let getPromise = preferences.get('startup', 'default');
getPromise.then((value) => {
let getPromise = preferences.get('startup', 'default');
getPromise.then((value) => {
console.info("The value of 'startup' is " + value);
}).catch((err) => {
console.info("Failed to get the value of 'startup'. Cause: " + err);
})
}).catch((err) => {
console.info("Failed to get the preferences.")
});
console.info("Failed to get the value of 'startup'. Cause: " + err);
})
```
5. Store data persistently.
Use the **flush()** method to flush data from the **Preferences** instance to its file.
......@@ -161,11 +167,12 @@ Use the following APIs to delete a **Preferences** instance or data file.
Specify an observer as the callback to subscribe to data changes for an application. When the value of the subscribed key is changed and saved by **flush()**, the observer callback will be invoked to return the new data.
```js
var observer = function (key) {
let observer = function (key) {
console.info("The key" + key + " changed.");
}
preferences.on('change', observer);
preferences.put('startup', 'auto', function (err) {
// The data is changed from 'auto' to 'manual'.
preferences.put('startup', 'manual', function (err) {
if (err) {
console.info("Failed to put the value of 'startup'. Cause: " + err);
return;
......
en/application-dev/reference/apis/js-apis-data-preferences.md
浏览文件 @ b7824fa3
......@@ -38,15 +38,21 @@ Obtains a **Preferences** instance. This API uses an asynchronous callback to re
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------------------ | ---- | ------------------------------------------------------------ |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| name | string | Yes | Name of the **Preferences** instance. |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance.|
| callback | AsyncCallback&lt;[Preferences](#preferences)&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined** and **object** is the **Preferences** instance obtained. Otherwise, **err** is an error code.|
**Example**
FA model:
```js
var preferences = null;
data_preferences.getPreferences(this.context, 'mystore', function (err, object) {
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
let preferences = null;
data_preferences.getPreferences(context, 'mystore', function (err, object) {
if (err) {
console.info("Failed to get the preferences. Cause: " + err);
return;
......@@ -56,6 +62,28 @@ data_preferences.getPreferences(this.context, 'mystore', function (err, object)
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
let preferences = null;
data_preferences.getPreferences(context, 'mystore', function (err, object) {
if (err) {
console.info("Failed to get the preferences. Cause: " + err);
return;
}
preferences = object;
console.info("Got the preferences successfully.");
})
```
## data_preferences.getPreferences
......@@ -66,21 +94,29 @@ Obtains a **Preferences** instance. This API uses a promise to return the result
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | -------------------------- |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance.|
**Return value**
| Type | Description |
| ------------------------------------------ | ---------------------------------- |
| Promise&lt;[Preferences](#preferences)&gt; | Promise used to return the **Preferences** instance obtained.|
**Example**
FA model:
```js
var preferences = null;
let promise = data_preferences.getPreferences(this.context, 'mystore')
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
let preferences = null;
let promise = data_preferences.getPreferences(context, 'mystore');
promise.then((object) => {
preferences = object;
console.info("Got the preferences successfully.");
......@@ -89,6 +125,27 @@ promise.then((object) => {
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
let preferences = null;
let promise = data_preferences.getPreferences(context, 'mystore');
promise.then((object) => {
preferences = object;
console.info("Got the preferences successfully.");
}).catch((err) => {
console.info("Failed to get the preferences. Cause: " + err);
})
```
## data_preferences.deletePreferences
......@@ -103,23 +160,51 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to delete. |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
**Example**
FA model:
```js
data_preferences.deletePreferences(this.context, 'mystore', function (err) {
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
data_preferences.deletePreferences(context, 'mystore', function (err) {
if (err) {
console.info("Failed to delete the preferences. Cause: " + err);
return
return;
}
console.info("Deleted the preferences successfully." );
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
data_preferences.deletePreferences(context, 'mystore', function (err) {
if (err) {
console.info("Failed to delete the preferences. Cause: " + err);
return;
}
console.info("Deleted the preferences successfully." );
})
```
## data_preferences.deletePreferences
......@@ -134,19 +219,28 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | -------------------------- |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to delete.|
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
FA model:
```js
let promise = data_preferences.deletePreferences(this.context, 'mystore')
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
let promise = data_preferences.deletePreferences(context, 'mystore');
promise.then(() => {
console.info("Deleted the preferences successfully.");
}).catch((err) => {
......@@ -154,6 +248,25 @@ promise.then(() => {
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
let promise = data_preferences.deletePreferences(context, 'mystore');
promise.then(() => {
console.info("Deleted the preferences successfully.");
}).catch((err) => {
console.info("Failed to delete the preferences. Cause: " + err);
})
```
## data_preferences.removePreferencesFromCache
......@@ -166,15 +279,23 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to remove. |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
**Example**
FA model:
```js
data_preferences.removePreferencesFromCache(this.context, 'mystore', function (err) {
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
data_preferences.removePreferencesFromCache(context, 'mystore', function (err) {
if (err) {
console.info("Failed to remove the preferences. Cause: " + err);
return;
......@@ -183,6 +304,26 @@ data_preferences.removePreferencesFromCache(this.context, 'mystore', function (e
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
data_preferences.removePreferencesFromCache(context, 'mystore', function (err) {
if (err) {
console.info("Failed to remove the preferences. Cause: " + err);
return;
}
console.info("Removed the preferences successfully.");
})
```
## data_preferences.removePreferencesFromCache
......@@ -195,19 +336,28 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | -------------------------- |
| context | [Context](js-apis-ability-context.md) | Yes | Application context. |
| Name | Type | Mandatory| Description |
| ------- | ------------------------------------- | ---- | ----------------------- |
| context | Context | Yes | Application context.<br>For the application context of the FA model, see [Context](js-apis-Context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md). |
| name | string | Yes | Name of the **Preferences** instance to remove.|
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
FA model:
```js
let promise = data_preferences.removePreferencesFromCache(this.context, 'mystore')
// Obtain the context.
import featureAbility from '@ohos.ability.featureAbility';
let context = featureAbility.getContext();
let promise = data_preferences.removePreferencesFromCache(context, 'mystore');
promise.then(() => {
console.info("Removed the preferences successfully.");
}).catch((err) => {
......@@ -215,6 +365,25 @@ promise.then(() => {
})
```
Stage model:
```ts
// Obtain the context.
import Ability from '@ohos.application.Ability';
let context = null;
class MainAbility extends Ability{
onWindowStageCreate(windowStage){
context = this.context;
}
}
let promise = data_preferences.removePreferencesFromCache(context, 'mystore');
promise.then(() => {
console.info("Removed the preferences successfully.");
}).catch((err) => {
console.info("Failed to remove the preferences. Cause: " + err);
})
```
## Preferences
......@@ -232,6 +401,7 @@ Obtains the value of a key. This API uses an asynchronous callback to return the
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | -------------------------------------------- | ---- | ------------------------------------------------------------ |
| key | string | Yes | Key of the data to obtain. It cannot be empty. |
......@@ -260,6 +430,7 @@ Obtains the value of a key. This API uses a promise to return the result. If the
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ----------------------- | ---- | ------------------------------------------------------------ |
| key | string | Yes | Key of the data to obtain. It cannot be empty. |
......@@ -272,6 +443,7 @@ Obtains the value of a key. This API uses a promise to return the result. If the
| Promise<[ValueType](#valuetype)&gt; | Promise used to return the value obtained.|
**Example**
```js
let promise = preferences.get('startup', 'default');
promise.then((data) => {
......@@ -290,6 +462,7 @@ Obtains an **Object** instance that contains all KV pairs. This API uses an asyn
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | --------------------------- | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback&lt;Object&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined** and **value** is the **Object** instance obtained. Otherwise, **err** is an error code.|
......@@ -318,11 +491,13 @@ Obtains an **Object** instance that contains all KV pairs. This API uses a promi
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Return value**
| Type | Description |
| --------------------- | ------------------------------------------- |
| Promise&lt;Object&gt; | Promise used to return the **Object** instance obtained.|
**Example**
```js
let promise = preferences.getAll();
promise.then((value) => {
......@@ -343,6 +518,7 @@ Writes data to this **Preferences** instance. This API uses an asynchronous call
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------- | ---- | ------------------------------------------------------------ |
| key | string | Yes | Key of the data. It cannot be empty. |
......@@ -350,6 +526,7 @@ Writes data to this **Preferences** instance. This API uses an asynchronous call
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is undefined. Otherwise, **err** is an error code. |
**Example**
```js
preferences.put('startup', 'auto', function (err) {
if (err) {
......@@ -370,17 +547,20 @@ Writes data to this **Preferences** instance. This API uses a promise to return
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name| Type | Mandatory| Description |
| ------ | ----------------------- | ---- | ------------------------------------------------------------ |
| key | string | Yes | Key of the data. It cannot be empty. |
| value | [ValueType](#valuetype) | Yes | Value to write. The value can be a number, a string, a Boolean value, or an array of numbers, strings, or Boolean values.|
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
```js
let promise = preferences.put('startup', 'auto');
promise.then(() => {
......@@ -395,17 +575,19 @@ promise.then(() => {
has(key: string, callback: AsyncCallback&lt;boolean&gt;): void
Checks whether this **Preferences** instance contains a KV pair of the given key. This API uses an asynchronous callback to return the result..
Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses an asynchronous callback to return the result..
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ---------------------------- | ---- | ------------------------------------------------------------ |
| key | string | Yes | Key of the data to check. It cannot be empty. |
| callback | AsyncCallback&lt;boolean&gt; | Yes | Callback invoked to return the result. If the **Preferences** instance contains the KV pair, **true** will be returned. Otherwise, **false** will be returned.|
**Example**
```js
preferences.has('startup', function (err, isExist) {
if (err) {
......@@ -425,16 +607,18 @@ preferences.has('startup', function (err, isExist) {
has(key: string): Promise&lt;boolean&gt;
Checks whether this **Preferences** instance contains data with the given key. This API uses a promise to return the result.
Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses a promise to return the result..
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name| Type | Mandatory| Description |
| ------ | ------ | ---- | ------------------------------- |
| key | string | Yes | Key of the data to check. It cannot be empty.|
**Return value**
| Type | Description |
| ---------------------- | ------------------------------------------------------------ |
| Promise&lt;boolean&gt; | Promise used to return the result. If the **Preferences** instance contains the KV pair, **true** will be returned. Otherwise, **false** will be returned.|
......@@ -464,12 +648,14 @@ Deletes a KV pair from this **Preferences** instance. This API uses an asynchron
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------- | ---- | ---------------------------------------------------- |
| key | string | Yes | Key of the KV pair to delete. It cannot be empty. |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
**Example**
```js
preferences.delete('startup', function (err) {
if (err) {
......@@ -490,16 +676,19 @@ Deletes a KV pair from this **Preferences** instance. This API uses a promise to
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name| Type | Mandatory| Description |
| ------ | ------ | ---- | ------------------------------- |
| key | string | Yes | Key of the KV pair to delete. It cannot be empty.|
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
```js
let promise = preferences.delete('startup');
promise.then(() => {
......@@ -514,16 +703,18 @@ promise.then(() => {
flush(callback: AsyncCallback&lt;void&gt;): void
Saves the data of the **Preferences** instance to a file asynchronously. This API uses an asynchronous callback to return the result.
Saves the data of this **Preferences** instance to a file asynchronously. This API uses an asynchronous callback to return the result.
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------- | ---- | ---------------------------------------------------- |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
**Example**
```js
preferences.flush(function (err) {
if (err) {
......@@ -539,16 +730,18 @@ preferences.flush(function (err) {
flush(): Promise&lt;void&gt;
Saves the data of the **Preferences** instance to a file asynchronously. This API uses a promise to return the result.
Saves the data of this **Preferences** instance to a file asynchronously. This API uses a promise to return the result.
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
```js
let promise = preferences.flush();
promise.then(() => {
......@@ -568,11 +761,13 @@ Clears this **Preferences** instance. This API uses an asynchronous callback to
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | ------------------------- | ---- | ---------------------------------------------------- |
| callback | AsyncCallback&lt;void&gt; | Yes | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
**Example**
```js
preferences.clear(function (err) {
if (err) {
......@@ -593,11 +788,13 @@ Clears this **Preferences** instance. This API uses a promise to return the resu
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Return value**
| Type | Description |
| ------------------- | ------------------------- |
| Promise&lt;void&gt; | Promise that returns no value.|
**Example**
```js
let promise = preferences.clear()
promise.then(() => {
......@@ -617,23 +814,25 @@ Subscribes to data changes. A callback will be triggered to return the new value
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | -------------------------------- | ---- | ---------------------------------------- |
| type | string | Yes | Event type to subscribe to. The value **change** indicates data change events.|
| callback | Callback&lt;{ key : string }&gt; | Yes | Callback invoked to return data changes. |
**Example**
```js
data_preferences.getPreferences(this.context, 'mystore', function (err, preferences) {
if (err) {
console.info("Failed to get the preferences.");
return;
}
var observer = function (key) {
let observer = function (key) {
console.info("The key " + key + " changed.");
}
preferences.on('change', observer);
preferences.put('startup', 'auto', function (err) {
preferences.put('startup', 'manual', function (err) {
if (err) {
console.info("Failed to put the value of 'startup'. Cause: " + err);
return;
......@@ -661,19 +860,21 @@ Unsubscribes from data changes.
**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
**Parameters**
| Name | Type | Mandatory| Description |
| -------- | -------------------------------- | ---- | ------------------------------------------ |
| type | string | Yes | Event type to unsubscribe from. The value **change** indicates data change events. |
| callback | Callback&lt;{ key : string }&gt; | No | Callback to unregister. If this parameter is left blank, the callbacks used to subscribing to all data changes will be unregistered.|
**Example**
```js
data_preferences.getPreferences(this.context, 'mystore', function (err, preferences) {
if (err) {
console.info("Failed to get preferences.");
console.info("Failed to get the preferences.");
return;
}
var observer = function (key) {
let observer = function (key) {
console.info("The key " + key + " changed.");
}
preferences.on('change', observer);
......
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