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en/application-dev/reference/apis/js-apis-distributed-data.md
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# Distributed Data Management
>![](../../public_sys-resources/icon-note.gif) **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.
......@@ -230,7 +229,7 @@ Closes a KV store. This method uses an asynchronous callback to return the resul
| Name| Type| Mandatory| Description|
| ------- | ----------------- | ---- | --------------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
| storeId | string | Yes| Unique identifier of the KV store to close. The length cannot exceed the value of [MAX\_STORE\_ID_LENGTH](#constants).|
| kvStore | [KVStore](#kvstore) | Yes| KV store to close.|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the KV store is closed, **true** will be returned. Otherwise, **false** will be returned.|
......@@ -273,7 +272,7 @@ Closes a KV store. This method uses a promise to return the result.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
| storeId | string | Yes| Unique identifier of the KV store to close. The length cannot exceed the value of [MAX\_STORE\_ID_LENGTH](#constants).|
| kvStore | [KVStore](#kvstore) | Yes| KV store to close.|
......@@ -325,7 +324,7 @@ Deletes a KV store. This method uses an asynchronous callback to return the resu
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
| storeId | string | Yes| Unique identifier of the KV store to delete. The length cannot exceed the value of [MAX\_STORE\_ID_LENGTH](#constants).|
| callback | AsyncCallback&lt;void&gt; | Yes| Callback used to return the result. If the KV store is deleted, **true** will be returned. Otherwise, **false** will be returned.|
......@@ -367,7 +366,7 @@ Deletes a KV store. This method uses a promise to return the result.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
| storeId | string | Yes| Unique identifier of the KV store to delete. The length cannot exceed the value of [MAX\_STORE\_ID_LENGTH](#constants).|
......@@ -419,7 +418,7 @@ Obtains the IDs of all the KV stores that are created using **getKvStore** and h
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
| callback | AsyncCallback&lt;void&gt; | Yes|Callback used to return the KV store IDs obtained. |
- Example
......@@ -447,7 +446,7 @@ Obtains the IDs of all the KV stores that are created using **getKvStore** and h
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| appId | string | Yes| Bundle name of the app used by the KV store.|
| appId | string | Yes| Bundle name of the app that invokes the KV store.|
- Return value
......@@ -545,7 +544,7 @@ Provides KV store configuration.
| createIfMissing | boolean | No| Whether to create a KV store if no database file exists. By default, a KV store is created.|
| encrypt | boolean | No|Whether to encrypt database files. By default, database files are not encrypted.|
| backup | boolean | No|Whether to back up database files. By default, database files are backed up. |
| autoSync | boolean | No|Whether database files are automatically synchronized. By default, database files are not automatically synchronized.|
| autoSync | boolean | No|Whether to automatically synchronize database files. By default, database files are not automatically synchronized.|
| kvStoreType | [KVStoreType](#kvstoretype) | No|Type of the KV store to create. By default, a device KV store is created. The device KV store stores data for multiple devices that collaborate with each other.|
| securityLevel | [SecurityLevel](#securitylevel) | No|Security level of the KV store. By default, the security level is not set.|
......@@ -585,7 +584,7 @@ Defines the KV store constants.
| MAX\_KEY_LENGTH| 1024 | Maximum length (in bytes) of a key in the KV store.|
| MAX\_VALUE_LENGTH| 4194303 | Maximum length (in bytes) of a value in the KV store.|
| MAX\_KEY\_LENGTH\_DEVICE| 896 | Maximum length of the device coordinate key.|
| MAX\_STORE\_ID\_LENGTH| 128 | Maximum length (in bytes) of the KV store ID.|
| MAX\_STORE\_ID\_LENGTH| 128 | Maximum length (in bytes) of a KV store ID.|
| MAX\_QUERY_LENGTH| 512000 | Maximum query length.|
| MAX\_BATCH_SIZE| 128 | Maximum size of a batch operation.|
......@@ -633,7 +632,7 @@ Adds a child node to this **FieldNode**.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| child | [FieldNode](#FieldNode) | Yes| Field node to add.|
| child | [FieldNode](#FieldNode) | Yes| Child node to add.|
- Return value
......@@ -694,7 +693,7 @@ Obtains the field name.
## KvStoreResultSet<sup>8+</sup> ##
Provides methods to obtain the KV Store result set and query or move the data read position. Before calling **KvStoreResultSet**, you must create a **KvStore** instance using **KvStore**.
Provides methods to obtain the KV store result set and query or move the data read position. Before calling any method in **KvStoreResultSet**, you must use **KvStore** to create a **KvStore** instance.
### getCount<sup>8+</sup> ###
......@@ -936,7 +935,7 @@ Moves the data read position from 0 to an absolute position.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| position | number | Yes|Absolute position.|
| position | number | Yes|Absolute position to move to.|
- Return value
......@@ -1161,14 +1160,14 @@ Resets the **Query** object that contains common query options.
equalTo(field: string, value: number|string|boolean): Query;
Creates a **Query** object to match the specified field and value equal to the specified value.
Creates a **Query** object to match the specified field whose value is equal to the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value to match.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1194,13 +1193,13 @@ Creates a **Query** object to match the specified field and value equal to the s
notEqualTo(field: string, value: number|string|boolean): Query;
Creates a **Query** object to match the specified field and value not equal to the specified value.
Creates a **Query** object to match the specified field whose value is not equal to the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1227,13 +1226,13 @@ Creates a **Query** object to match the specified field and value not equal to t
greaterThan(field: string, value: number|string|boolean): Query;
Creates a **Query** object to match the specified field and value greater than the specified value.
Creates a **Query** object to match the specified field whose value is greater than the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1260,14 +1259,14 @@ Creates a **Query** object to match the specified field and value greater than t
lessThan(field: string, value: number|string): Query;
Creates a **Query** object to match the specified field and value less than the specified value.
Creates a **Query** object to match the specified field whose value is less than the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value to match.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1293,13 +1292,13 @@ Creates a **Query** object to match the specified field and value less than the
greaterThanOrEqualTo(field: string, value: number|string): Query;
Creates a **Query** object to match the specified field and value greater than or equal to the specified value.
Creates a **Query** object to match the specified field whose value is greater than or equal to the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1326,14 +1325,14 @@ Creates a **Query** object to match the specified field and value greater than o
lessThanOrEqualTo(field: string, value: number|string): Query;
Creates a **Query** object to match the specified field and value less than or equal to the specified value.
Creates a **Query** object to match the specified field whose value is less than or equal to the specified value.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value to match.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| value | number/string/boolean | Yes| Value specified.|
- Return value
......@@ -1365,7 +1364,7 @@ Creates a **Query** object to match the specified field whose value is **null**.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
- Return value
......@@ -1397,7 +1396,7 @@ Creates a **Query** object to match the specified field whose value is within th
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | number[] | Yes| List of numbers.|
- Return value
......@@ -1431,7 +1430,7 @@ Creates a **Query** object to match the specified field whose value is within th
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | string[] | Yes| List of strings.|
- Return value
......@@ -1464,7 +1463,7 @@ Creates a **Query** object to match the specified field whose value is not withi
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | number[] | Yes| List of numbers.|
- Return value
......@@ -1497,7 +1496,7 @@ Creates a **Query** object to match the specified field whose value is not withi
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | string[] | Yes| List of strings.|
- Return value
......@@ -1524,13 +1523,13 @@ Creates a **Query** object to match the specified field whose value is not withi
like(field: string, value: string): Query;
Creates a **Query** object to match the specified field whose value is similar to the specified value.
Creates a **Query** object to match the specified field whose value is similar to the specified string.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | string | Yes| String specified.|
- Return value
......@@ -1557,13 +1556,13 @@ Creates a **Query** object to match the specified field whose value is similar t
unlike(field: string, value: string): Query;
Creates a **Query** object to match the specified field whose value is not similar to the specified value.
Creates a **Query** object to match the specified field whose value is not similar to the specified string.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
| valueList | string | Yes| String specified.|
- Return value
......@@ -1652,7 +1651,7 @@ Creates a **Query** object to sort the query results in ascending order.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
- Return value
......@@ -1685,7 +1684,7 @@ Creates a **Query** object to sort the query results in descending order.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| fieId | string | Yes|Field specified. It must start with $ and cannot contain ^.|
| fieId | string | Yes|Field to match. It must start with $ and cannot contain ^.|
- Return value
......@@ -1719,8 +1718,8 @@ Creates a **Query** object to specify the number of results and where to start.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| total | number | Yes|Number of results.|
| offset | number | Yes|Start position.|
| total | number | Yes|Number of results to query.|
| offset | number | Yes|Start position for query.|
- Return value
......@@ -1779,7 +1778,7 @@ Creates a **Query** object with a specified field that is not null.
beginGroup(): Query;
Creates a **Query** object with a query condition group with a left parenthesis.
Creates a **Query** object for a query condition group with a left parenthesis.
- Return value
......@@ -1807,7 +1806,7 @@ Creates a **Query** object with a query condition group with a left parenthesis.
endGroup(): Query;
Creates a **Query** object with a query condition group with a right parenthesis.
Creates a **Query** object for a query condition group with a right parenthesis.
- Return value
......@@ -1874,7 +1873,7 @@ Creates a **Query** object with an index preferentially used for query.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| index | string | Yes|Index to be set.|
| index | string | Yes|Index preferentially used for query.|
- Return value
......@@ -1956,13 +1955,13 @@ Obtains the query statement of this **Query** object.
## KVStore
Provides methods to manage data in a KV store, for example, adding or deleting data and subscribing to data changes or completion of data synchronization. Before calling any method in **KVStore**, you must use **getKVStore** to create a **KVStore** object.
Provides methods to manage data in a KV store, for example, adding or deleting data and subscribing to data changes or completion of data synchronization. Before calling any method in **KVStore**, you must use **getKVStore** to obtain a **KVStore** object.
### put
put(key: string, value: Uint8Array | string | number | boolean, callback: AsyncCallback&lt;void&gt;): void
Adds a KV pair of the specified type to the KV store. This method uses an asynchronous callback to return the result.
Adds a KV pair of the specified type to this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -1996,7 +1995,7 @@ Adds a KV pair of the specified type to the KV store. This method uses an asynch
put(key: string, value: Uint8Array | string | number | boolean): Promise&lt;void&gt;
Adds a KV pair of the specified type to the KV store. This method uses a promise to return the result.
Adds a KV pair of the specified type to this KV store. This method uses a promise to return the result.
- Parameters
......@@ -2034,7 +2033,7 @@ Adds a KV pair of the specified type to the KV store. This method uses a promise
delete(key: string, callback: AsyncCallback&lt;void&gt;): void
Deletes a KV pair from the KV store. This method uses an asynchronous callback to return the result.
Deletes a KV pair from this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2074,7 +2073,7 @@ Deletes a KV pair from the KV store. This method uses an asynchronous callback t
delete(key: string): Promise&lt;void&gt;
Deletes a KV pair from the KV store. This method uses a promise to return the result.
Deletes a KV pair from this KV store. This method uses a promise to return the result.
- Parameters
......@@ -2121,7 +2120,7 @@ Subscribes to data changes of the specified type. This method uses a synchronous
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| event |'dataChange' | Yes|Type of the events.|
| event |'dataChange' | Yes|Type of the events to subscribe to.|
| type |[SubscribeType](#subscribetypea) | Yes|Type of data changes.|
| observer |Callback&lt;[ChangeNotification](#changenotificationa)&gt; | Yes|Callback used to return the result.|
......@@ -2140,13 +2139,13 @@ Subscribes to data changes of the specified type. This method uses a synchronous
on(event: 'syncComplete', syncCallback: Callback<Array&lt;[string, number]&gt;): void
Subscribes to notifications of data synchronization completion. This method uses a synchronous callback to return the result.
Subscribes to data synchronization completion events. This method uses a synchronous callback to return the result.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| event |'syncComplete' | Yes|Type of the events.|
| event |'syncComplete' | Yes|Type of the events to subscribe to.|
| syncCallback |Callback&lt;Array&lt;[string, number]&gt; | Yes|Callback used to return the result.|
......@@ -2163,13 +2162,13 @@ Subscribes to notifications of data synchronization completion. This method uses
off(event:'dataChange', observer?: Callback&lt;ChangeNotification&gt;): void;
Unsubscribes from data change notifications. This method is a synchronous method.
Unsubscribes from data change events. This method uses a synchronouscallback to return the result.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| event |'dataChange' | Yes|Type of the events.|
| event |'dataChange' | Yes|Type of the events to unsubscribe from.|
| observer |Callback&lt;[ChangeNotification](#changenotificationa)&gt; |No|Callback used to return the result.|
- Example
......@@ -2189,7 +2188,7 @@ Unsubscribes from data change notifications. This method is a synchronous method
putBatch(entries: Entry[], callback: AsyncCallback&lt;void&gt;): void;
Inserts KV pairs in batches to the KV store. This method uses an asynchronous callback to return the result.
Inserts KV pairs in batches to this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2235,7 +2234,7 @@ Inserts KV pairs in batches to the KV store. This method uses an asynchronous ca
putBatch(entries: Entry[]): Promise&lt;void&gt;;
Inserts KV pairs in batches to the KV store. This method uses a promise to return the result.
Inserts KV pairs in batches to this KV store. This method uses a promise to return the result.
- Parameters
......@@ -2288,7 +2287,7 @@ Inserts KV pairs in batches to the KV store. This method uses a promise to retur
deleteBatch(keys: string[], callback: AsyncCallback&lt;void&gt;): void;
Deletes KV pairs in batches from the KV store. This method uses an asynchronous callback to return the result.
Deletes KV pairs in batches from this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2333,7 +2332,7 @@ Deletes KV pairs in batches from the KV store. This method uses an asynchronous
deleteBatch(keys: string[]): Promise&lt;void&gt;;
Deletes KV pairs in batches from the KV store. This method uses a promise to return the result.
Deletes KV pairs in batches from this KV store. This method uses a promise to return the result.
- Parameters
......@@ -2387,7 +2386,7 @@ Deletes KV pairs in batches from the KV store. This method uses a promise to ret
startTransaction(callback: AsyncCallback&lt;void&gt;): void;
Starts transactions in the KV store. This method uses an asynchronous callback to return the result.
Starts transactions in this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2437,7 +2436,7 @@ Starts transactions in the KV store. This method uses an asynchronous callback t
startTransaction(): Promise&lt;void&gt;;
Starts transactions in the KV store. This method uses a promise to return the result.
Starts transactions in this KV store. This method uses a promise to return the result.
- Return value
......@@ -2470,7 +2469,7 @@ Starts transactions in the KV store. This method uses a promise to return the re
commit(callback: AsyncCallback&lt;void&gt;): void;
Commits transactions in the KV store. This method uses an asynchronous callback to return the result.
Commits transactions in this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2500,7 +2499,7 @@ Commits transactions in the KV store. This method uses an asynchronous callback
commit(): Promise&lt;void&gt;;
Commits transactions in the KV store. This method uses a promise to return the result.
Commits transactions in this KV store. This method uses a promise to return the result.
- Return value
......@@ -2528,7 +2527,7 @@ Commits transactions in the KV store. This method uses a promise to return the r
rollback(callback: AsyncCallback&lt;void&gt;): void;
Rolls back transactions in the KV store. This method uses an asynchronous callback to return the result.
Rolls back transactions in this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2558,7 +2557,7 @@ Rolls back transactions in the KV store. This method uses an asynchronous callba
rollback(): Promise&lt;void&gt;;
Rolls back transactions in the KV store. This method uses a promise to return the result.
Rolls back transactions in this KV store. This method uses a promise to return the result.
- Return value
......@@ -2592,7 +2591,7 @@ Sets data synchronization, which can be enabled or disable. This method uses an
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| enabled |boolean | Yes|Whether to enable data synchronization. The value **true** means to enable data synchronization, and the value **false** means the opposite.|
| enabled |boolean | Yes|Whether to enable data synchronization. The value **true** means to enable data synchronization, and **false** means the opposite.|
| callback |AsyncCallback&lt;void&gt; | Yes|Callback used to return the result.|
- Example
......@@ -2623,7 +2622,7 @@ Sets data synchronization, which can be enabled or disable. This method uses a p
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| enabled |boolean | Yes|Whether to enable data synchronization. The value **true** means to enable data synchronization, and the value **false** means the opposite.|
| enabled |boolean | Yes|Whether to enable data synchronization. The value **true** means to enable data synchronization, and **false** means the opposite.|
- Return value
......@@ -2657,7 +2656,7 @@ Sets the data synchronization range. This method uses an asynchronous callback t
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| localLabels |string[] | Yes|Synchronization label set for the local device.|
| localLabels |string[] | Yes|Synchronization labels set for the local device.|
| remoteSupportLabels |string[] | Yes|Synchronization labels set for remote devices.|
| callback |AsyncCallback&lt;void&gt; | Yes|Callback used to return the result.|
......@@ -2687,7 +2686,7 @@ Sets the data synchronization range. This method uses a promise to return the re
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| localLabels |string[] | Yes|Synchronization label set for the local device.|
| localLabels |string[] | Yes|Synchronization labels set for the local device.|
| remoteSupportLabels |string[] | Yes|Synchronization labels set for remote devices.|
......@@ -2722,8 +2721,8 @@ Defines the subscription type.
| Name| Default Value| Description|
| ----- | ------ | ----------------------- |
| SUBSCRIBE_TYPE_LOCAL |0 |Local data changes.|
| SUBSCRIBE_TYPE_REMOTE |1 |Peer data changes.|
| SUBSCRIBE_TYPE_ALL |2 |Local and peer data changes.|
| SUBSCRIBE_TYPE_REMOTE |1 |Remote data changes.|
| SUBSCRIBE_TYPE_ALL |2 |Local and remote data changes.|
## ChangeNotification
......@@ -2738,12 +2737,12 @@ Defines the content of data change notifications, including inserted data, updat
## Entry
Defines the KV pairs stored in the database.
Defines the KV pairs stored in the KV store.
| Name| Type|Readable|Writable| Description|
| ----- | ------- | -----| ------|------------------------ |
| key | string | Yes| Yes|Key of the KV pair stored in the database.|
| value | [Value](#value) | Yes| Yes|Value of the KV pair stored in the database.|
| key | string | Yes| Yes|Key of the KV pair stored in the KV store.|
| value | [Value](#value) | Yes| Yes|Value of the KV pair stored in the KV store.|
## Value
......@@ -2757,9 +2756,9 @@ Defines the value in a KV pair.
## ValueType
Defines the types of the value in a KV pair.
Enumerates the types of values in KV pairs.
It can be used only by internal applications.
These value types can be used only by internal applications.
| Name| Default Value| Description|
| ----- | ------ | ----------------------- |
......@@ -2772,7 +2771,7 @@ It can be used only by internal applications.
## SingleKVStore
Provides methods to query and synchronize data in a single KV store. This class inherits from **KVStore**. Before calling any method in **SingleKVStore**, you must use **getKVStore** to create a **SingleKVStore** object.
Provides methods to query and synchronize data in a single KV store. This class inherits from **KVStore**. Before calling any method in **SingleKVStore**, you must use **getKVStore** to obtain a **SingleKVStore** object.
### get
......@@ -2785,7 +2784,7 @@ Obtains the value of a specified key. This method uses an asynchronous callback
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| key |string | Yes|Key of the value to obtain. It cannot be empty, and the length cannot exceed [MAX\_KEY\_LENGTH](#constants).|
| callback |AsyncCallback&lt;Uint8Array / string / boolean / number&gt;) | Yes|Callback invoked to return the value obtained.|
| callback |AsyncCallback&lt;Uint8Array / string / boolean / number&gt;) | Yes|Callback used to return the value obtained.|
- Example
......@@ -2827,7 +2826,7 @@ Obtains the value of a specified key. This method uses a promise to return the r
| Type| Description|
| ------ | ------- |
|Promise&lt;Uint8Array / string / boolean / number&gt; |Promise used to return the result.|
|Promise&lt;Uint8Array / string / boolean / number&gt; |Promise used to return the value obtained.|
- Example
......@@ -2856,7 +2855,7 @@ Obtains the value of a specified key. This method uses a promise to return the r
getEntries(keyPrefix: string, callback: AsyncCallback&lt;Entry[]&gt;): void;
Obtains all KV pairs that match the specified key prefix. This method uses an asynchronous callback to return the result.
Obtains the KV pairs that match the specified key prefix. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -2900,7 +2899,7 @@ Obtains all KV pairs that match the specified key prefix. This method uses an as
getEntries(keyPrefix: string): Promise&lt;Entry[]&gt;;
Obtains all KV pairs that match the specified key prefix. This method uses a promise to return the result.
Obtains the KV pairs that match the specified key prefix. This method uses a promise to return the result.
- Parameters
......@@ -2912,7 +2911,7 @@ Obtains all KV pairs that match the specified key prefix. This method uses a pro
| Type| Description|
| ------ | ------- |
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the result.|
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the KV pairs obtained.|
- Example
......@@ -2956,7 +2955,7 @@ Obtains all KV pairs that match the specified key prefix. This method uses a pro
getEntries(query: Query, callback: AsyncCallback&lt;Entry[]&gt;): void;
Obtains the KV pairs matching the specified **Query** object. This method uses an asynchronous callback to return the result.
Obtains the KV pairs that match the specified **Query** object. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -3005,7 +3004,7 @@ Obtains the KV pairs matching the specified **Query** object. This method uses a
getEntries(query: Query): Promise&lt;Entry[]&gt;;
Obtains the KV pairs matching the specified **Query** object. This method uses a promise to return the result.
Obtains the KV pairs that match the specified **Query** object. This method uses a promise to return the result.
- Parameters
......@@ -3017,7 +3016,7 @@ Obtains the KV pairs matching the specified **Query** object. This method uses a
| Type| Description|
| ------ | ------- |
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the result.|
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the KV pairs obtained.|
- Example
......@@ -3060,7 +3059,7 @@ Obtains the KV pairs matching the specified **Query** object. This method uses a
getResultSet(keyPrefix: string, callback: AsyncCallback&lt;KvStoreResultSet&gt;): void;
Obtains the result set with the specified prefix from the single KV store. This method uses an asynchronous callback to return the result.
Obtains the result set with the specified key prefix from this single KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -3107,7 +3106,7 @@ Obtains the result set with the specified prefix from the single KV store. This
getResultSet(keyPrefix: string): Promise&lt;KvStoreResultSet&gt;;
Obtains the result set with the specified prefix from the single KV store. This method uses a promise to return the result.
Obtains the result set with the specified key prefix from this single KV store. This method uses a promise to return the result.
- Parameters
......@@ -3119,7 +3118,7 @@ Obtains the result set with the specified prefix from the single KV store. This
| Type| Description|
| ------ | ------- |
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)&gt; |Promise used to return the result.|
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)&gt; |Promise used to return the result set obtained.|
- Example
......@@ -3171,7 +3170,7 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |Query | Yes|**Query** object.|
| query |Query | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)&gt; | Yes|Callback used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -3217,13 +3216,13 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)&gt; |Promise used to return the result.|
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)&gt; |Promise used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -3272,7 +3271,7 @@ Closes the **KvStoreResultSet** object obtained by **getResultSet**. This method
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| resultSet |[KvStoreResultSet](#kvstoreresultsetsup8sup) | Yes|**KvStoreResultSet** object to close.|
| callback |AsyncCallback&lt;void&gt; | Yes|Callback used to return the **KvStoreResultSet** object obtained by **getResultSet**.|
| callback |AsyncCallback&lt;void&gt; | Yes|Callback used to return the execution result.|
- Example
......@@ -3338,7 +3337,7 @@ Obtains the number of results matching the specified **Query** object. This meth
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;number&gt; | Yes|Callback used to return the number of results obtained.|
- Example
......@@ -3382,13 +3381,13 @@ Obtains the number of results matching the specified **Query** object. This meth
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;number&gt; |Promise used to return the result.|
|Promise&lt;number&gt; |Promise used to return the number of results obtained.|
- Example
......@@ -3435,7 +3434,7 @@ Deletes data of a device. This method uses an asynchronous callback to return th
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|Name of the target device.|
| deviceId |string | Yes|ID of the target device.|
| callback |AsyncCallback&lt;void&gt; | Yes|Callback used to return the result.|
- Example
......@@ -3475,7 +3474,7 @@ Deletes data of a device. This method uses a promise to return the result.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|Name of the target device.|
| deviceId |string | Yes|ID of the target device.|
- Return value
......@@ -3586,9 +3585,9 @@ Manually triggers KV store synchronization synchronously.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceIdList |string[] | Yes|IDs of the devices in the same networking environment to be synchronized.|
| deviceIdList |string[] | Yes|IDs of the devices to be synchronized. These devices must be in the same networking environment.|
| mode |[SyncMode](#syncmode) | Yes|Data synchronization mode.|
| allowedDelayMs |number | No|Allowed delay time, in ms.|
| allowedDelayMs |number | No|Allowed synchronization delay time, in ms.|
- Example
......@@ -3666,13 +3665,13 @@ Sets the default delay of database synchronization. This method uses a promise t
getSecurityLevel(callback: AsyncCallback&lt;SecurityLevel&gt;): void;
Obtains the security level of a KV store. This method uses an asynchronous callback to return the result.
Obtains the security level of this KV store. This method uses an asynchronous callback to return the result.
- Parameters
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| callback |AsyncCallback&lt;[SecurityLevel](#securitylevel)&gt; | Yes|Callback used to return the result.|
| callback |AsyncCallback&lt;[SecurityLevel](#securitylevel)&gt; | Yes|Callback used to return the security level obtained.|
- Example
......@@ -3692,13 +3691,13 @@ Obtains the security level of a KV store. This method uses an asynchronous callb
getSecurityLevel(): Promise&lt;SecurityLevel&gt;;
Obtains the security level of a KV store. This method uses a promise to return the result.
Obtains the security level of this KV store. This method uses a promise to return the result.
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[SecurityLevel](#securitylevel)&gt; |Promise used to return the result.|
|Promise&lt;[SecurityLevel](#securitylevel)&gt; |Promise used to return the security level obtained.|
- Example
......@@ -3719,7 +3718,7 @@ Obtains the security level of a KV store. This method uses a promise to return t
## DeviceKVStore<sup>8+</sup> ##
Provides methods to manage distributed data by device in the distributed system. This class inherits from **KvStore** and provides data query and synchronization methods. Before calling any method in **DeviceKVStore**, you must use **getKVStore** to create a **DeviceKVStore** object.
Provides methods to manage distributed data by device in the distributed system. This class inherits from **KvStore** and provides data query and synchronization methods. Before calling any method in **DeviceKVStore**, you must use **getKVStore** to obtain a **DeviceKVStore** object.
### get<sup>8+</sup> ###
......@@ -3772,7 +3771,7 @@ Obtains the string value that matches the specified key for a device. This metho
| Type| Description|
| ------ | ------- |
|Promise&lt;boolean/string/number/Uint8Array&gt; |Promise used to return the result.|
|Promise&lt;boolean/string/number/Uint8Array&gt; |Promise used to return the value obtained.|
- Example
......@@ -3801,7 +3800,7 @@ Obtains the string value that matches the specified key for a device. This metho
getEntries(deviceId: string, keyPrefix: string, callback: AsyncCallback&lt;Entry[]&gt;): void;
Obtains all KV pairs that match the specified key prefix for a device. This method uses an asynchronous callback to return the result.
Obtains the KV pairs that match the specified key prefix for a device. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -3847,7 +3846,7 @@ Obtains all KV pairs that match the specified key prefix for a device. This meth
getEntries(deviceId: string, keyPrefix: string): Promise&lt;Entry[]&gt;;
Obtains all KV pairs that match the specified key prefix for a device. This method uses a promise to return the result.
Obtains the KV pairs that match the specified key prefix for a device. This method uses a promise to return the result.
- Parameters
......@@ -3860,7 +3859,7 @@ Obtains all KV pairs that match the specified key prefix for a device. This meth
| Type| Description|
| ------ | ------- |
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the result.|
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the KV pairs obtained.|
- Example
......@@ -3910,7 +3909,7 @@ Obtains the KV pairs matching the specified **Query** object. This method uses a
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;[Entry](#entry)[]&gt; | Yes|Callback used to return the KV pairs obtained.|
- Example
......@@ -3961,13 +3960,13 @@ Obtains the KV pairs matching the specified **Query** object. This method uses a
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the result.|
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the KV pairs obtained.|
- Example
......@@ -4018,7 +4017,7 @@ Obtains the KV pairs matching the specified **Query** object for a device. This
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;[Entry](#entry)[]&gt; | Yes|Callback used to return the KV pairs obtained.|
- Example
......@@ -4070,13 +4069,13 @@ Obtains the KV pairs matching the specified **Query** object for a device. This
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the result.|
|Promise&lt;[Entry](#entry)[]&gt; |Promise used to return the KV pairs obtained.|
- Example
......@@ -4167,7 +4166,7 @@ Obtains the **KvStoreResultSet** object that matches the specified key prefix fo
| Type| Description|
| ------ | ------- |
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the result.|
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -4202,7 +4201,7 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; | Yes|Callback used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -4252,13 +4251,13 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the result.|
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -4315,7 +4314,7 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; | Yes|Callback used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -4365,13 +4364,13 @@ Obtains the **KvStoreResultSet** object that matches the specified **Query** obj
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the result.|
|Promise&lt;[KvStoreResultSet](#kvstoreresultsetsup8sup)[]&gt; |Promise used to return the **KvStoreResultSet** object obtained.|
- Example
......@@ -4497,7 +4496,7 @@ Obtains the number of results that matches the specified **Query** object. This
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;number&gt; | Yes|Callback used to return the number of results obtained.|
- Example
......@@ -4542,13 +4541,13 @@ Obtains the number of results that matches the specified **Query** object. This
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;number&gt; |Promise used to return the result.|
|Promise&lt;number&gt; |Promise used to return the number of results obtained.|
- Example
......@@ -4597,7 +4596,7 @@ Obtains the number of results that matches the specified **Query** object for a
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
| callback |AsyncCallback&lt;number&gt; | Yes|Callback used to return the number of results obtained.|
- Example
......@@ -4642,13 +4641,13 @@ Obtains the number of results that matches the specified **Query** object for a
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceId |string | Yes|ID of the target device.|
| query |[Query](#querysup8sup) | Yes|**Query** object.|
| query |[Query](#querysup8sup) | Yes|**Query** object to match.|
- Return value
| Type| Description|
| ------ | ------- |
|Promise&lt;number&gt; |Promise used to return the result.|
|Promise&lt;number&gt; |Promise used to return the number of results obtained.|
- Example
......@@ -4689,7 +4688,7 @@ Obtains the number of results that matches the specified **Query** object for a
removeDeviceData(deviceId: string, callback: AsyncCallback&lt;void&gt;): void;
Deletes data of a device from this KV store. This method uses an asynchronous callback to return the result.
Removes data of a device from this KV store. This method uses an asynchronous callback to return the result.
- Parameters
......@@ -4729,7 +4728,7 @@ Deletes data of a device from this KV store. This method uses an asynchronous ca
removeDeviceData(deviceId: string): Promise&lt;void&gt;;
Deletes data of a device from this KV store. This method uses a promise to return the result.
Removes data of a device from this KV store. This method uses a promise to return the result.
- Parameters
......@@ -4783,8 +4782,8 @@ Manually triggers KV store synchronization synchronously.
| Name| Type| Mandatory| Description|
| ----- | ------ | ---- | ----------------------- |
| deviceIdList |string[] | Yes|IDs of the devices to be synchronized.|
| mode |[SyncMode](#syncmode) | Yes|Synchronization mode, which can be **PUSH**, **PULL**, or **PUSH_PULL**.|
| allowedDelayMs |number | No|Allowed delay time, in ms.|
| mode |[SyncMode](#syncmode) | Yes|Data synchronization mode, which can be **PUSH**, **PULL**, or **PUSH_PULL**.|
| allowedDelayMs |number | No|Allowed synchronization delay time, in ms.|
- Example
......
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