harmony 鸿蒙@ohos.application.DataShareExtensionAbility (DataShare ExtensionAbility)

2022-08-09
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@ohos.application.DataShareExtensionAbility (DataShare ExtensionAbility)

The DataShareExtensionAbility module provides data share services based on the ExtensionAbility.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

The APIs provided by this module are system APIs and can be used only in the stage model.

Modules to Import

import DataShareExtensionAbility from '@ohos.application.DataShareExtensionAbility';

Attributes

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Name	Type	Readable	Writable	Description
context¹⁰⁺	ExtensionContext	Yes	No	Context of the DataShare ExtensionAbility.

onCreate

onCreate?(want: Want, callback: AsyncCallback<void>): void

Called by the server to initialize service logic when the DataShare client connects to the DataShareExtensionAbility server. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Want information, including the ability name and bundle name.
callback	AsyncCallback<void>	Yes	Callback that returns no value.

Example

import relationalStore from '@ohos.data.relationalStore'
import Want from '@ohos.app.ability.Want'

let DB_NAME = 'DB00.db';
let TBL_NAME = 'TBL00';
let DDL_TBL_CREATE = 'CREATE TABLE IF NOT EXISTS '
  + TBL_NAME
  + ' (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, phoneNumber DOUBLE, isStudent BOOLEAN, Binary BINARY)';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  onCreate(want: Want, callback: Function) {
    relationalStore.getRdbStore(this.context, {
      name: DB_NAME,
      securityLevel: relationalStore.SecurityLevel.S1
    }, (err, data) => {
      console.info(`getRdbStore done, data : ${data}`);
      rdbStore = data;
      rdbStore.executeSql(DDL_TBL_CREATE, [], (err) => {
        console.error(`executeSql done, error message : ${err}`);
      });
      if (callback) {
        callback();
      }
    });
  }
};

insert

insert?(uri: string, valueBucket: ValuesBucket, callback: AsyncCallback<number>): void

Inserts data into the database. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI of the data to insert.
valueBucket	ValuesBucket	Yes	Data to insert.
callback	AsyncCallback<number>	Yes	Callback invoked to return the index of the data inserted.

Example

import relationalStore from '@ohos.data.relationalStore'
import { ValuesBucket } from '@ohos.data.ValuesBucket'

let TBL_NAME = 'TBL00';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  insert(uri: string, valueBucket: ValuesBucket, callback: Function) {
    if (valueBucket === null) {
      console.error('invalid valueBuckets');
      return;
    }
    rdbStore.insert(TBL_NAME, valueBucket, (err, ret) => {
      console.info(`callback ret: ${ret}`);
      if (callback !== undefined) {
        callback(err, ret);
      }
    });
  }
};

update

update?(uri: string, predicates: dataSharePredicates.DataSharePredicates, valueBucket: ValuesBucket, callback: AsyncCallback<number>): void

Updates data in the database. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI of the data to update.
predicates	dataSharePredicates.DataSharePredicates	Yes	Filter criteria for updating data.
valueBucket	ValuesBucket	Yes	New data.
callback	AsyncCallback<number>	Yes	Callback invoked to return the number of updated data records.

Example

import relationalStore from '@ohos.data.relationalStore';
import dataSharePredicates from '@ohos.data.dataSharePredicates';
import { ValuesBucket } from '@ohos.data.ValuesBucket'

let TBL_NAME = 'TBL00';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  update(uri: string, predicates: dataSharePredicates.DataSharePredicates, valueBucket: ValuesBucket, callback: Function) {
    if (predicates === null||predicates === undefined) {
      return;
    }
    rdbStore.update(TBL_NAME, valueBucket, predicates, (err, ret) => {
      if (callback !== undefined) {
        callback(err, ret);
      }
    });
  }
};

delete

delete?(uri: string, predicates: dataSharePredicates.DataSharePredicates, callback: AsyncCallback<number>): void

Deletes data from the database. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI of the data to delete.
predicates	dataSharePredicates.DataSharePredicates	Yes	Filter criteria for deleting data.
callback	AsyncCallback<number>	Yes	Callback invoked to return the number of data records deleted.

Example

import relationalStore from '@ohos.data.relationalStore';
import dataSharePredicates from '@ohos.data.dataSharePredicates';

let TBL_NAME = 'TBL00';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  delete(uri: string, predicates: dataSharePredicates.DataSharePredicates, callback: Function) {
    if (predicates === null||predicates === undefined) {
      return;
    }
    rdbStore.delete(TBL_NAME, predicates, (err, ret) => {
      if (callback !== undefined) {
        callback(err, ret);
      }
    });
  }
};

query

query?(uri: string, predicates: dataSharePredicates.DataSharePredicates, columns: Array<string>, callback: AsyncCallback<Object>): void

Queries data from the database. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI of the data to query.
predicates	dataSharePredicates.DataSharePredicates	Yes	Filter criteria for querying data.
columns	Array<string>	Yes	Columns to query. If this parameter is empty, all columns will be queried.
callback	AsyncCallback<Object>	Yes	Callback invoked to return the result set obtained.

Example

import relationalStore from '@ohos.data.relationalStore';
import dataSharePredicates from '@ohos.data.dataSharePredicates';

let TBL_NAME = 'TBL00';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  query(uri: string, predicates: dataSharePredicates.DataSharePredicates, columns: Array<string>, callback: Function) {
    if (predicates === null||predicates === undefined) {
      return;
    }
    rdbStore.query(TBL_NAME, predicates, columns, (err, resultSet) => {
      if (resultSet !== undefined) {
        console.info(`resultSet.rowCount: ${resultSet.rowCount}`);
      }
      if (callback !== undefined) {
        callback(err, resultSet);
      }
    });
  }
};

batchInsert

batchInsert?(uri: string, valueBuckets: Array<ValuesBucket>, callback: AsyncCallback<number>): void

Batch inserts data into the database. This API is called by the server and can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI of the data to insert.
valueBuckets	Array<ValuesBucket>	Yes	Data to insert.
callback	AsyncCallback<number>	Yes	Callback invoked to return the number of inserted data records.

Example

import relationalStore from '@ohos.data.relationalStore';
import { ValuesBucket } from '@ohos.data.ValuesBucket'

let TBL_NAME = 'TBL00';
let rdbStore: relationalStore.RdbStore;

export default class DataShareExtAbility extends DataShareExtensionAbility {
  batchInsert(uri: string, valueBuckets: Array<ValuesBucket>, callback: Function) {
    if (valueBuckets === null||valueBuckets.length === undefined) {
      console.error('invalid valueBuckets');
      return;
    }
    rdbStore.batchInsert(TBL_NAME, valueBuckets, (err, ret) => {
      if (callback !== undefined) {
        callback(err, ret);
      }
    });
  };
};

normalizeUri

normalizeUri?(uri: string, callback: AsyncCallback<string>): void

Normalizes a URI. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI to normalize.
callback	AsyncCallback<string>	Yes	Callback used to return the result. If the operation is successful, the normalized URI is returned. Otherwise, null is returned.

Example

import { BusinessError } from '@ohos.base'

export default class DataShareExtAbility extends DataShareExtensionAbility {
  normalizeUri(uri: string, callback: Function) {
    let key = 'code';
    let value = 0;
    let err: BusinessError = {
      code: value,
      name: key,
      message: key
    };
    let ret: string = `normalize: ${uri}`;
    callback(err, ret);
  }
};

denormalizeUri

denormalizeUri?(uri: string, callback: AsyncCallback<string>): void

Denormalizes a URI. This API can be overridden as required.

System capability: SystemCapability.DistributedDataManager.DataShare.Provider

Parameters

Name	Type	Mandatory	Description
uri	string	Yes	URI to denormalize.
callback	AsyncCallback<string>	Yes	Callback used to return the result. If the operation is successful, the denormalized URI is returned. If the URI passed in is returned, denormalization is not required. If denormalization is not supported, null is returned.

Example

import { BusinessError } from '@ohos.base'

export default class DataShareExtAbility extends DataShareExtensionAbility {
  denormalizeUri(uri: string, callback: Function) {
    let key = 'code';
    let value = 0;
    let err: BusinessError = {
      code: value,
      name: key,
      message: key
    };
      let ret = `denormalize ${uri}`;
      callback(err, ret);
  }
};