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en/application-dev/reference/apis/js-apis-data-distributedobject.md
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# Distributed Data Object
Provides basic data object management, including creating, querying, deleting, modifying, and subscribing to data objects, and distributed data object collaboration for the same application among multiple devices.
The distributedDataObject module provides basic data object management, including creating, querying, deleting, modifying, and subscribing to data objects, and distributed data object collaboration for the same application among multiple devices.
> **NOTE**<br/>
>
......@@ -23,9 +23,9 @@ Creates a distributed data object.
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| source | object | Yes| Attribute of the distributed data object to create.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| source | object | Yes| Attribute of the distributed data object to create.|
**Return value**
| Type| Description|
......@@ -33,12 +33,11 @@ Creates a distributed data object.
| [DistributedObject](#distributedobject) | Distributed data object created.|
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
// Create a distributed data object, which contains attributes of four types, namely, string, number, boolean, and object.
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,
parent:{mother:"jack mom",father:"jack Dad"}});
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
// Create a distributed data object, which contains attributes of four types, namely, string, number, boolean, and object.
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
```
## distributedObject.genSessionId
......@@ -50,15 +49,15 @@ Creates a random session ID.
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Return value**
| Type| Description|
| -------- | -------- |
| string | Session ID created.|
| Type| Description|
| -------- | -------- |
| string | Session ID created.|
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
var sessionId = distributedObject.genSessionId();
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var sessionId = distributedObject.genSessionId();
```
## SaveSuccessResponse<sup>9+</sup>
......@@ -98,27 +97,26 @@ Sets a session ID for synchronization. Automatic synchronization is performed fo
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| sessionId | string | No| ID of a distributed data object on a trusted network. To remove a distributed data object from the network, set this parameter to "" or leave it empty.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| sessionId | string | No| ID of a distributed data object on a trusted network. To remove a distributed data object from the network, set this parameter to "" or leave it empty.|
**Return value**
| Type| Description|
| -------- | -------- |
| boolean | Returns **true** if the session ID is set successfully;<br>returns **false** otherwise. |
| Type| Description|
| -------- | -------- |
| boolean | Returns **true** if the session ID is set successfully;<br>returns **false** otherwise. |
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,
parent:{mother:"jack mom",father:"jack Dad"}});
// Add g_object to the distributed network.
g_object.setSessionId(distributedObject.genSessionId());
// Remove g_object from the distributed network.
g_object.setSessionId("");
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});;
// Add g_object to the distributed network.
g_object.setSessionId(distributedObject.genSessionId());
// Remove g_object from the distributed network.
g_object.setSessionId("");
```
### on('change')
......@@ -130,15 +128,15 @@ Subscribes to the changes of this distributed data object.
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to subscribe to. The value is **change**, which indicates data changes.|
| callback | Callback<{ sessionId: string, fields: Array&lt;string&gt; }> | Yes| Callback used to return the changes of the distributed data object.<br>**sessionId** indicates the session ID of the distributed data object.<br>**fields** indicates the changed attributes of the distributed data object.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to subscribe to. The value is **change**, which indicates data changes.|
| callback | Callback<{ sessionId: string, fields: Array&lt;string&gt; }> | Yes| Callback used to return the changes of the distributed data object.<br>**sessionId** indicates the session ID of the distributed data object.<br>**fields** indicates the changed attributes of the distributed data object.|
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,parent:{mother:"jack mom",father:"jack Dad"}});
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
globalThis.changeCallback = (sessionId, changeData) => {
console.info("change" + sessionId);
if (changeData != null && changeData != undefined) {
......@@ -159,16 +157,16 @@ Unsubscribes from the changes of this distributed data object.
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to unsubscribe from. The value is **change**, which indicates data changes.|
| callback | Callback<{ sessionId: string, fields: Array&lt;string&gt; }> | No| Callback to be unregistered. If this parameter is not set, all data change callbacks of the object will be unregistered.<br>**sessionId** indicates the session ID of the distributed data object.<br>**fields** indicates the changed attributes of the distributed data object.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to unsubscribe from. The value is **change**, which indicates data changes.|
| callback | Callback<{ sessionId: string, fields: Array&lt;string&gt; }> | No| Callback to be unregistered. If this parameter is not set, all data change callbacks of the object will be unregistered.<br>**sessionId** indicates the session ID of the distributed data object.<br>**fields** indicates the changed attributes of the distributed data object.|
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,parent:{mother:"jack mom",father:"jack Dad"}});
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
// Unregister the specified data change callback.
g_object.off("change", globalThis.changeCallback);
// Unregister all data change callbacks.
......@@ -184,10 +182,10 @@ Subscribes to the status change (online or offline) of this distributed data obj
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to subscribe to. The value is **status**, which indicates the status change (online or offline) of the distributed data object.|
| callback | Callback<{ sessionId: string, networkId: string, status: 'online' \| 'offline' }> | Yes| Callback used to return the status change.<br>**sessionId**: session ID of the distributed data object.<br>**networkId**: object device ID, that is, **deviceId**.<br>**status** indicates the object status, which can be online or offline. |
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to subscribe to. The value is **status**, which indicates the status change (online or offline) of the distributed data object.|
| callback | Callback<{ sessionId: string, networkId: string, status: 'online' \| 'offline' }> | Yes| Callback used to return the status change.<br>**sessionId**: session ID of the distributed data object.<br>**networkId**: object device ID, that is, **deviceId**.<br>**status** indicates the object status, which can be online or offline.|
**Example**
```js
......@@ -195,7 +193,7 @@ import distributedObject from '@ohos.data.distributedDataObject';
globalThis.statusCallback = (sessionId, networkId, status) => {
globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
}
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,parent:{mother:"jack mom",father:"jack Dad"}});
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
g_object.on("status", globalThis.statusCallback);
```
......@@ -209,16 +207,16 @@ Unsubscribes from the status change (online or offline) of this distributed data
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to unsubscribe from. The value is **status**, which indicates the status change (online or offline) of the distributed data object.|
| callback | Callback<{ sessionId: string, deviceId: string, status: 'online' \| 'offline' }> | No| Callback used to return the status change. If this parameter is not specified, this API unsubscribes from all callbacks of this distributed data object.<br>**sessionId**: session ID of the distributed data object.<br>**deviceId** indicates the device ID of the distributed data object.<br>**status** indicates the status, which can be online or offline.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| type | string | Yes| Event type to unsubscribe from. The value is **status**, which indicates the status change (online or offline) of the distributed data object.|
| callback | Callback<{ sessionId: string, deviceId: string, status: 'online' \| 'offline' }> | No| Callback used to return the status change. If this parameter is not specified, this API unsubscribes from all callbacks of this distributed data object.<br>**sessionId**: session ID of the distributed data object.<br>**deviceId** indicates the device ID of the distributed data object.<br>**status** indicates the status, which can be online or offline.|
**Example**
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false,parent:{mother:"jack mom",father:"jack Dad"}});
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false, parent:{mother:"jack mom",father:"jack Dad"}});
globalThis.statusCallback = (sessionId, networkId, status) => {
globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
}
......@@ -245,24 +243,24 @@ The saved data will be released in the following cases:
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId | string | Yes| ID of the device where data is stored. The value **local** indicates the local device.|
| callback | AsyncCallback&lt;[SaveSuccessResponse](#savesuccessresponse)&gt; | Yes| Callback used to return **SaveSuccessResponse**, which contains information such as session ID, version, and device ID.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId | string | Yes| ID of the device where data is stored. The value **local** indicates the local device.|
| callback | AsyncCallback&lt;[SaveSuccessResponse](#savesuccessresponse9)&gt; | Yes| Callback used to return **SaveSuccessResponse**, which contains information such as session ID, version, and device ID.|
**Example**
```ts
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.save("local", (result)=>{
console.log("save callback");
console.info("save sessionId " + result.sessionId);
console.info("save version " + result.version);
console.info("save deviceId " + result.deviceId);
});
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.save("local", (status, result)=>{
console.log("save status = " + status);
console.log("save callback");
console.info("save sessionId: " + result.sessionId);
console.info("save version: " + result.version);
console.info("save deviceId: " + result.deviceId);
});
```
### save<sup>9+</sup>
......@@ -281,31 +279,31 @@ The saved data will be released in the following cases:
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId | string | Yes| ID of the device where the data is saved. The default value is **local**, which indicates the local device. |
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| deviceId | string | Yes| ID of the device where the data is saved. The default value is **local**, which indicates the local device. |
**Return value**
**Return value**
| Type| Description|
| -------- | -------- |
| Promise&lt;[SaveSuccessResponse](#savesuccessresponse)&gt; | Promise used to return **SaveSuccessResponse**, which contains information such as session ID, version, and device ID.|
| Type| Description|
| -------- | -------- |
| Promise&lt;[SaveSuccessResponse](#savesuccessresponse9)&gt; | Promise used to return **SaveSuccessResponse**, which contains information such as session ID, version, and device ID.|
**Example**
```ts
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.save("local").then((result)=>{
console.log("save callback");
console.info("save sessionId " + result.sessionId);
console.info("save version " + result.version);
console.info("save deviceId " + result.deviceId);
}, ()=>{
console.error("save failed");
});
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.save("local").then((result)=>{
console.log("save callback");
console.info("save sessionId " + result.sessionId);
console.info("save version " + result.version);
console.info("save deviceId " + result.deviceId);
}, ()=>{
console.error("save failed");
});
```
### revokeSave<sup>9+</sup>
......@@ -319,20 +317,20 @@ If the object is stored on another device, the data on the local device will be
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Parameters**
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| callback | AsyncCallback&lt;[RevokeSaveSuccessResponse](#revokesavesuccessresponse)&gt; | No| Callback used to return **RevokeSaveSuccessResponse**, which contains the session ID.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| callback | AsyncCallback&lt;[RevokeSaveSuccessResponse](#revokesavesuccessresponse9)&gt; | No| Callback used to return **RevokeSaveSuccessResponse**, which contains the session ID.|
**Example**
```ts
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.revokeSave((result, data) =>{
console.log("revokeSave callback");
});
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.revokeSave((result, data) =>{
console.log("revokeSave callback");
});
```
### revokeSave<sup>9+</sup>
......@@ -345,22 +343,22 @@ If the object is stored on another device, the data on the local device will be
**System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
**Return value**
**Return value**
| Type| Description|
| -------- | -------- |
| Promise&lt;[RevokeSaveSuccessResponse](#revokesavesuccessresponse)&gt; | Promise used to return **RevokeSaveSuccessResponse**, which contains the session ID.|
| Type| Description|
| -------- | -------- |
| Promise&lt;[RevokeSaveSuccessResponse](#revokesavesuccessresponse9)&gt; | Promise used to return **RevokeSaveSuccessResponse**, which contains the session ID.|
**Example**
```ts
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.revokeSave("local").then((result)=>{
console.log("revokeSave callback");
console.log("sessionId" + result.sessionId);
}, ()=>{
console.error("revokeSave failed");
});
```
```js
import distributedObject from '@ohos.data.distributedDataObject';
var g_object = distributedObject.createDistributedObject({name:"Amy", age:18, isVis:false});
g_object.setSessionId("123456");
g_object.revokeSave().then((result)=>{
console.log("revokeSave callback");
console.log("sessionId" + result.sessionId);
}, ()=>{
console.error("revokeSave failed");
});
```
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