提交 cdc1c966 编写于 作者: W wusongqing

updated docs against 4319

Signed-off-by: Nwusongqing <wusongqing@huawei.com>
上级 453c3357
......@@ -6,13 +6,13 @@ Data ability providers can customize data access-related APIs such as data inser
## Available APIs
**Table 1** Data ability lifecycle callbacks
**Table 1** Data ability lifecycle APIs
|API|Description|
|:------|:------|
|onInitialized|Called during ability initialization to initialize the relational database (RDB).|
|update|Updates data in the database.|
|query|Queries data in the database.|
|delete|Deletes one or multiple data records from the database.|
|delete|Deletes one or more data records from the database.|
|normalizeUri|Normalizes the URI. A normalized URI applies to cross-device use, persistence, backup, and restore. When the context changes, it ensures that the same data item can be referenced.|
|batchInsert|Inserts multiple data records into the database.|
|denormalizeUri|Converts a normalized URI generated by **normalizeUri** into a denormalized URI.|
......@@ -21,17 +21,25 @@ Data ability providers can customize data access-related APIs such as data inser
|getFileTypes|Obtains the MIME type of a file.|
|getType|Obtains the MIME type matching the data specified by the URI.|
|executeBatch|Operates data in the database in batches.|
|call|A customized API.|
|call|Calls a custom API.|
## How to Develop
### Creating a Data Ability
1. To meet the basic requirements of the database storage service, implement the **Insert**, **Query**, **Update**, and **Delete** APIs in the **Data** class to provide batch data processing. The traversal logic has been implemented by the **BatchInsert** and **ExecuteBatch** APIs.
1. To meet the basic requirements of the database storage service, implement the **Insert**, **Query**, **Update**, and **Delete** APIs in the **Data** class. The **BatchInsert** and **ExecuteBatch** APIs have already implemented the traversal logic, but not batch data processing.
The following code snippet shows how to create a Data ability:
```javascript
import dataAbility from '@ohos.data.dataAbility'
import dataRdb from '@ohos.data.rdb'
const TABLE_NAME = 'book'
const STORE_CONFIG = { name: 'book.db' }
const SQL_CREATE_TABLE = 'CREATE TABLE IF NOT EXISTS book(id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, introduction TEXT NOT NULL)'
let rdbStore: dataRdb.RdbStore = undefined
export default {
onInitialized(abilityInfo) {
console.info('DataAbility onInitialized, abilityInfo:' + abilityInfo.bundleName)
......@@ -50,7 +58,7 @@ Data ability providers can customize data access-related APIs such as data inser
for (let i = 0;i < valueBuckets.length; i++) {
console.info('DataAbility batch insert i=' + i)
if (i < valueBuckets.length - 1) {
rdbStore.insert(TABLE_NAME, valueBuckets[i], (num: number) => {
rdbStore.insert(TABLE_NAME, valueBuckets[i], (err: any, num: number) => {
console.info('DataAbility batch insert ret=' + num)
})
} else {
......@@ -76,7 +84,7 @@ Data ability providers can customize data access-related APIs such as data inser
};
```
2. Submodule Configuration
2. Configure the submodule.
| JSON Field| Description |
| ------------ | ------------------------------------------------------------ |
......@@ -118,6 +126,10 @@ The basic dependency packages include:
For details about the APIs provided by **DataAbilityHelper**, see [DataAbilityHelper Module](../reference/apis/js-apis-dataAbilityHelper.md).
```js
// Different from the URI defined in the config.json file, the URI passed in the parameter has an extra slash (/), because there is a DeviceID parameter between the second and the third slash (/).
import featureAbility from '@ohos.ability.featureAbility'
import ohos_data_ability from '@ohos.data.dataAbility'
import ohos_data_rdb from '@ohos.data.rdb'
var urivar = "dataability:///com.ix.DataAbility"
var DAHelper = featureAbility.acquireDataAbilityHelper(
urivar
......@@ -137,7 +149,7 @@ The basic dependency packages include:
urivar,
valuesBucket,
(error, data) => {
expect(typeof(data)).assertEqual("number")
console.log("DAHelper insert result: " + data)
}
);
```
......@@ -156,7 +168,7 @@ The basic dependency packages include:
urivar,
da,
(error, data) => {
expect(typeof(data)).assertEqual("number")
console.log("DAHelper delete result: " + data)
}
);
```
......@@ -176,7 +188,7 @@ The basic dependency packages include:
valuesBucket,
da,
(error, data) => {
expect(typeof(data)).assertEqual("number")
console.log("DAHelper update result: " + data)
}
);
```
......@@ -197,7 +209,7 @@ The basic dependency packages include:
valArray,
da,
(error, data) => {
expect(typeof(data)).assertEqual("object")
console.log("DAHelper query result: " + data)
}
);
```
......@@ -217,7 +229,7 @@ The basic dependency packages include:
urivar,
cars,
(error, data) => {
expect(typeof(data)).assertEqual("number")
console.log("DAHelper batchInsert result: " + data)
}
);
```
......@@ -241,12 +253,12 @@ The basic dependency packages include:
valuesBucket: {"executeBatch" : "value1",},
predicates: da,
expectedCount:0,
PredicatesBackReferences: {},
predicatesBackReferences: null,
interrupted:true,
}
],
(error, data) => {
expect(typeof(data)).assertEqual("object")
console.log("DAHelper executeBatch result: " + data)
}
);
```
......@@ -265,21 +277,15 @@ The basic dependency packages include:
},
predicates: da,
expectedCount:0,
PredicatesBackReferences: {},
predicatesBackReferences: null,
interrupted:true,
}
]
);
```
## Development Example
The following sample is provided to help you better understand how to develop a Data ability:
- [DataAbility](https://gitee.com/openharmony/app_samples/tree/master/ability/DataAbility)
This sample shows how to:
## Samples
Create a Data ability in the **data.ts** file in the **DataAbility** directory.
The following sample is provided to help you better understand how to develop Data abilities:
Encapsulate the process of accessing the Data ability in the **MainAbility** directory.
- [`DataAbility`: Creation and Access of Data Abilities (eTS, API version 8)](https://gitee.com/openharmony/app_samples/tree/master/ability/DataAbility)
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册