导入模块

import distributedKVStore from '@ohos.data.distributedKVStore';

KVManagerConfig

提供KVManager实例的配置信息，包括调用方的包名和应用的上下文。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

Constants

分布式键值数据库常量。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

ValueType

数据类型枚举。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

Value

存储在数据库中的值对象。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

Entry

存储在数据库中的键值对。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

ChangeNotification

数据变更时通知的对象，包括数据插入的数据、更新的数据、删除的数据和设备ID。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

SyncMode

同步模式枚举。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

SubscribeType

订阅类型枚举。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

KVStoreType

分布式键值数据库类型枚举。

SecurityLevel

数据库的安全级别枚举。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

Options

用于提供创建数据库的配置信息。

Schema

表示数据库模式，可以在创建或打开数据库时创建Schema对象并将它们放入Options中。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

constructor

constructor()

用于创建Schema实例的构造函数。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

FieldNode

表示 Schema 实例的节点，提供定义存储在数据库中的值的方法。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

constructor

constructor(name: string)

用于创建带有string字段FieldNode实例的构造函数。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

appendChild

appendChild(child: FieldNode): boolean

在当前 FieldNode 中添加一个子节点。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

返回值：

示例：

try {
    let node = new distributedKVStore.FieldNode("root");
    let child1 = new distributedKVStore.FieldNode("child1");
    let child2 = new distributedKVStore.FieldNode("child2");
    let child3 = new distributedKVStore.FieldNode("child3");
    node.appendChild(child1);
    node.appendChild(child2);
    node.appendChild(child3);
    console.info("appendNode " + JSON.stringify(node));
    child1 = null;
    child2 = null;
    child3 = null;
    node = null;
} catch (e) {
    console.error("AppendChild " + e);
}

distributedKVStore.createKVManager

createKVManager(config: KVManagerConfig): KVManager

创建一个KVManager对象实例，用于管理数据库对象。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

Stage模型下的示例：

import UIAbility from '@ohos.app.ability.UIAbility';

let kvManager;
export default class EntryAbility extends UIAbility {
    onCreate() {
        console.info("MyAbilityStage onCreate")
        let context = this.context
        const kvManagerConfig = {
            context: context,
            bundleName: 'com.example.datamanagertest',
        }
        try {
            kvManager = distributedKVStore.createKVManager(kvManagerConfig);
            console.info("Succeeded in creating KVManager");
        } catch (e) {
            console.error(`Failed to create KVManager.code is ${e.code},message is ${e.message}`);
        }
    }
}

FA模型下的示例：

import featureAbility from '@ohos.ability.featureAbility';
let kvManager;
let context = featureAbility.getContext()
const kvManagerConfig = {
    context: context,
    bundleName: 'com.example.datamanagertest',
}
try {
    kvManager = distributedKVStore.createKVManager(kvManagerConfig);
    console.info("Succeeded in creating KVManager");
} catch (e) {
    console.error(`Failed to create KVManager.code is ${e.code},message is ${e.message}`);
}

KVManager

分布式键值数据库管理实例，用于获取分布式键值数据库的相关信息。在调用KVManager的方法前，需要先通过createKVManager构建一个KVManager实例。

getKVStore

getKVStore<T>(storeId: string, options: Options, callback: AsyncCallback<T>): void

通过指定Options和storeId，创建并获取分布式键值数据库，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

let kvStore;
try {
    const options = {
        createIfMissing: true,
        encrypt: false,
        backup: false,
        autoSync: true,
        kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
        securityLevel: distributedKVStore.SecurityLevel.S2,
    };
    kvManager.getKVStore('storeId', options, function (err, store) {
        if (err) {
            console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info("Succeeded in getting KVStore");
        kvStore = store;
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

getKVStore

getKVStore<T>(storeId: string, options: Options): Promise<T>

通过指定Options和storeId，创建并获取分布式键值数据库，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

let kvStore;
try {
    const options = {
        createIfMissing: true,
        encrypt: false,
        backup: false,
        autoSync: true,
        kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
        securityLevel: distributedKVStore.SecurityLevel.S2,
    };
    kvManager.getKVStore('storeId', options).then((store) => {
        console.info("Succeeded in getting KVStore");
        kvStore = store;
    }).catch((err) => {
        console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

closeKVStore

closeKVStore(appId: string, storeId: string, callback: AsyncCallback<void>): void

通过storeId的值关闭指定的分布式键值数据库，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

示例：

const options = {
    createIfMissing: true,
    encrypt: false,
    backup: false,
    autoSync: true,
    kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
    schema: undefined,
    securityLevel: distributedKVStore.SecurityLevel.S2,
}
try {
    kvManager.getKVStore('storeId', options, async function (err, store) {
        if (err != undefined) {
            console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in getting KVStore');
        kvStore = store;
        kvStore = null;
        store = null;
        kvManager.closeKVStore('appId', 'storeId', function (err) {
            if (err != undefined) {
                console.error(`Failed to close KVStore.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in closing KVStore');
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

closeKVStore

closeKVStore(appId: string, storeId: string): Promise<void>

通过storeId的值关闭指定的分布式键值数据库，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

const options = {
    createIfMissing: true,
    encrypt: false,
    backup: false,
    autoSync: true,
    kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
    schema: undefined,
    securityLevel: distributedKVStore.SecurityLevel.S2,
}
try {
    kvManager.getKVStore('storeId', options).then(async (store) => {
        console.info('Succeeded in getting KVStore');
        kvStore = store;
        kvStore = null;
        store = null;
        kvManager.closeKVStore('appId', 'storeId').then(() => {
            console.info('Succeeded in closing KVStore');
        }).catch((err) => {
            console.error(`Failed to close KVStore.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to close KVStore.code is ${e.code},message is ${e.message}`);
}

deleteKVStore

deleteKVStore(appId: string, storeId: string, callback: AsyncCallback<void>): void

通过storeId的值删除指定的分布式键值数据库，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const options = {
    createIfMissing: true,
    encrypt: false,
    backup: false,
    autoSync: true,
    kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
    schema: undefined,
    securityLevel: distributedKVStore.SecurityLevel.S2,
}
try {
    kvManager.getKVStore('store', options, async function (err, store) {
        if (err != undefined) {
            console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in getting KVStore');
        kvStore = store;
        kvStore = null;
        store = null;
        kvManager.deleteKVStore('appId', 'storeId', function (err) {
            if (err != undefined) {
                console.error(`Failed to delete KVStore.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info(`Succeeded in deleting KVStore`);
        });
    });
} catch (e) {
    console.error(`Failed to delete KVStore.code is ${e.code},message is ${e.message}`);
}

deleteKVStore

deleteKVStore(appId: string, storeId: string): Promise<void>

通过storeId的值删除指定的分布式键值数据库，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const options = {
    createIfMissing: true,
    encrypt: false,
    backup: false,
    autoSync: true,
    kvStoreType: distributedKVStore.KVStoreType.SINGLE_VERSION,
    schema: undefined,
    securityLevel: distributedKVStore.SecurityLevel.S2,
}
try {
    kvManager.getKVStore('storeId', options).then(async (store) => {
        console.info('Succeeded in getting KVStore');
        kvStore = store;
        kvStore = null;
        store = null;
        kvManager.deleteKVStore('appId', 'storeId').then(() => {
            console.info('Succeeded in deleting KVStore');
        }).catch((err) => {
            console.error(`Failed to delete KVStore.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to get KVStore.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to delete KVStore.code is ${e.code},message is ${e.message}`);
}

getAllKVStoreId

getAllKVStoreId(appId: string, callback: AsyncCallback<string[]>): void

获取所有通过getKVStore方法创建的且没有调用deleteKVStore方法删除的分布式键值数据库的storeId，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

示例：

try {
    kvManager.getAllKVStoreId('appId', function (err, data) {
        if (err != undefined) {
            console.error(`Failed to get AllKVStoreId.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in getting AllKVStoreId');
        console.info(`GetAllKVStoreId size = ${data.length}`);
    });
} catch (e) {
    console.error(`Failed to get AllKVStoreId.code is ${e.code},message is ${e.message}`);
}

getAllKVStoreId

getAllKVStoreId(appId: string): Promise<string[]>

获取所有通过getKVStore方法创建的且没有调用deleteKVStore方法删除的分布式键值数据库的storeId，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    console.info('GetAllKVStoreId');
    kvManager.getAllKVStoreId('appId').then((data) => {
        console.info('Succeeded in getting AllKVStoreId');
        console.info(`GetAllKVStoreId size = ${data.length}`);
    }).catch((err) => {
        console.error(`Failed to get AllKVStoreId.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to get AllKVStoreId.code is ${e.code},message is ${e.message}`);
}

on('distributedDataServiceDie')

on(event: 'distributedDataServiceDie', deathCallback: Callback<void>): void

订阅服务状态变更通知。如果服务终止，需要重新注册数据变更通知和同步完成事件回调通知，并且同步操作会返回失败。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

示例：

try {
    console.info('KVManagerOn');
    const deathCallback = function () {
        console.info('death callback call');
    }
    kvManager.on('distributedDataServiceDie', deathCallback);
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

off('distributedDataServiceDie')

off(event: 'distributedDataServiceDie', deathCallback?: Callback<void>): void

取消订阅服务状态变更通知。参数中的deathCallback必须是已经订阅过的deathCallback，否则会取消订阅失败。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

示例：

try {
    console.info('KVManagerOff');
    const deathCallback = function () {
        console.info('death callback call');
    }
    kvManager.off('distributedDataServiceDie', deathCallback);
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

KVStoreResultSet

提供获取数据库结果集的相关方法，包括查询和移动数据读取位置等。同时允许打开的结果集的最大数量为8个。

在调用KVStoreResultSet的方法前，需要先通过getKVStore构建一个SingleKVStore或者DeviceKVStore实例。

getCount

getCount(): number

获取结果集中的总行数。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let count;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        count = resultSet.getCount();
        console.info("getCount succeed:" + count);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("getCount failed: " + e);
}

getPosition

getPosition(): number

获取结果集中当前的读取位置。读取位置会因moveToFirst、moveToLast等操作而发生变化。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let position;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeeded.');
        resultSet = result;
        position = resultSet.getPosition();
        console.info("getPosition succeed:" + position);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("getPosition failed: " + e);
}

moveToFirst

moveToFirst(): boolean

将读取位置移动到第一行。如果结果集为空，则返回false。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        moved = resultSet.moveToFirst();
        console.info("moveToFirst succeed: " + moved);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("moveToFirst failed " + e);
}

moveToLast

moveToLast(): boolean

将读取位置移动到最后一行。如果结果集为空，则返回false。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        moved = resultSet.moveToLast();
        console.info("moveToLast succeed:" + moved);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("moveToLast failed: " + e);
}

moveToNext

moveToNext(): boolean

将读取位置移动到下一行。如果结果集为空，则返回false。适用于全量获取数据库结果集的场景。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        do {
          moved = resultSet.moveToNext();
          console.info("moveToNext succeed: " + moved);
        } while (moved)
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("moveToNext failed: " + e);
}

moveToPrevious

moveToPrevious(): boolean

将读取位置移动到上一行。如果结果集为空，则返回false。适用于全量获取数据库结果集的场景。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        moved = resultSet.moveToLast();
        moved = resultSet.moveToPrevious();
        console.info("moveToPrevious succeed:" + moved);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("moveToPrevious failed: " + e);
}

move

move(offset: number): boolean

将读取位置移动到当前位置的相对偏移量。即当前游标位置向下偏移 offset 行。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('Succeeded in getting resultSet');
        resultSet = result;
        moved = resultSet.move(2); //若当前位置为0，将读取位置从绝对位置为0的位置移动2行，即移动到绝对位置为2，行数为3的位置
        console.info(`Succeeded in moving.moved = ${moved}`);
    }).catch((err) => {
        console.error(`Failed to get resultSet.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to move.code is ${e.code},message is ${e.message}`);
}

moveToPosition

moveToPosition(position: number): boolean

将读取位置从 0 移动到绝对位置。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let resultSet;
    let moved;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('Succeeded in getting resultSet');
        resultSet = result;
        moved = resultSet.moveToPosition(1);
        console.info(`Succeeded in moving to position.moved=${moved}`);
    }).catch((err) => {
        console.error(`Failed to get resultSet.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to move to position.code is ${e.code},message is ${e.message}`);
}

isFirst

isFirst(): boolean

检查读取位置是否为第一行。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let isfirst;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        isfirst = resultSet.isFirst();
        console.info("Check isFirst succeed:" + isfirst);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("Check isFirst failed: " + e);
}

isLast

isLast(): boolean

检查读取位置是否为最后一行。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    let islast;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        islast = resultSet.isLast();
        console.info("Check isLast succeed: " + islast);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("Check isLast failed: " + e);
}

isBeforeFirst

isBeforeFirst(): boolean

检查读取位置是否在第一行之前。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        const isbeforefirst = resultSet.isBeforeFirst();
        console.info("Check isBeforeFirst succeed: " + isbeforefirst);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("Check isBeforeFirst failed: " + e);
}

isAfterLast

isAfterLast(): boolean

检查读取位置是否在最后一行之后。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        const isafterlast = resultSet.isAfterLast();
        console.info("Check isAfterLast succeed:" + isafterlast);
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("Check isAfterLast failed: " + e);
}

getEntry

getEntry(): Entry

从当前位置获取对应的键值对。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let resultSet;
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('getResultSet succeed.');
        resultSet = result;
        const entry  = resultSet.getEntry();
        console.info("getEntry succeed:" + JSON.stringify(entry));
    }).catch((err) => {
        console.error('getResultSet failed: ' + err);
    });
} catch (e) {
    console.error("getEntry failed: " + e);
}

Query

使用谓词表示数据库查询，提供创建Query实例、查询数据库中的数据和添加谓词的方法。一个Query对象中谓词数量上限为256个。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

constructor

constructor()

用于创建Schema实例的构造函数。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

reset

reset(): Query

重置Query对象。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.equalTo("key", "value");
    console.info("query is " + query.getSqlLike());
    query.reset();
    console.info("query is " + query.getSqlLike());
    query = null;
} catch (e) {
    console.error("simply calls should be ok :" + e);
}

equalTo

equalTo(field: string, value: number|string|boolean): Query

构造一个Query对象来查询具有指定字段的条目，其值等于指定的值。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.equalTo("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

notEqualTo

notEqualTo(field: string, value: number|string|boolean): Query

构造一个Query对象以查询具有指定字段且值不等于指定值的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

greaterThan

greaterThan(field: string, value: number|string|boolean): Query

构造一个Query对象以查询具有大于指定值的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.greaterThan("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

lessThan

lessThan(field: string, value: number|string): Query

构造一个Query对象以查询具有小于指定值的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.lessThan("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

greaterThanOrEqualTo

greaterThanOrEqualTo(field: string, value: number|string): Query

构造一个Query对象以查询具有指定字段且值大于或等于指定值的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.greaterThanOrEqualTo("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

lessThanOrEqualTo

lessThanOrEqualTo(field: string, value: number|string): Query

构造一个Query对象以查询具有指定字段且值小于或等于指定值的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.lessThanOrEqualTo("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

isNull

isNull(field: string): Query

构造一个Query对象以查询具有值为null的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.isNull("field");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

inNumber

inNumber(field: string, valueList: number[]): Query

构造一个Query对象以查询具有指定字段的条目，其值在指定的值列表中。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.inNumber("field", [0, 1]);
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

inString

inString(field: string, valueList: string[]): Query

构造一个Query对象以查询具有指定字段的条目，其值在指定的字符串值列表中。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.inString("field", ['test1', 'test2']);
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

notInNumber

notInNumber(field: string, valueList: number[]): Query

构造一个Query对象以查询具有指定字段的条目，该字段的值不在指定的值列表中。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notInNumber("field", [0, 1]);
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

notInString

notInString(field: string, valueList: string[]): Query

构造一个Query对象以查询具有指定字段且值不在指定字符串值列表中的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notInString("field", ['test1', 'test2']);
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

like

like(field: string, value: string): Query

构造一个Query对象以查询具有与指定字符串值相似的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.like("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

unlike

unlike(field: string, value: string): Query

构造一个Query对象以查询具有与指定字符串值不相似的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.unlike("field", "value");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

and

and(): Query

构造一个带有与条件的查询对象。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value1");
    query.and();
    query.notEqualTo("field", "value2");
    console.info("query is " + query.getSqlLike());
    query = null;
} catch (e) {
    console.error("duplicated calls should be ok :" + e);
}

or

or(): Query

构造一个带有或条件的Query对象。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value1");
    query.or();
    query.notEqualTo("field", "value2");
    console.info("query is " + query.getSqlLike());
    query = null;
} catch (e) {
    console.error("duplicated calls should be ok :" + e);
}

orderByAsc

orderByAsc(field: string): Query

构造一个Query对象，将查询结果按升序排序。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value");
    query.orderByAsc("field");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

orderByDesc

orderByDesc(field: string): Query

构造一个Query对象，将查询结果按降序排序。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value");
    query.orderByDesc("field");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

limit

limit(total: number, offset: number): Query

构造一个Query对象来指定结果的数量和开始位置。该接口必须要在Query对象查询和升降序等操作之后调用，调用limit接口后，不可再对Query对象进行查询和升降序等操作。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

let total = 10;
let offset = 1;
try {
    let query = new distributedKVStore.Query();
    query.notEqualTo("field", "value");
    query.limit(total, offset);
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
     console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

isNotNull

isNotNull(field: string): Query

构造一个Query对象以查询具有值不为null的指定字段的条目。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.isNotNull("field");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

beginGroup

beginGroup(): Query

创建一个带有左括号的查询条件组。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.beginGroup();
    query.isNotNull("field");
    query.endGroup();
    console.info("query is " + query.getSqlLike());
    query = null;
} catch (e) {
    console.error("duplicated calls should be ok :" + e);
}

endGroup

endGroup(): Query

创建一个带有右括号的查询条件组。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.beginGroup();
    query.isNotNull("field");
    query.endGroup();
    console.info("query is " + query.getSqlLike());
    query = null;
} catch (e) {
    console.error("duplicated calls should be ok :" + e);
}

prefixKey

prefixKey(prefix: string): Query

创建具有指定键前缀的查询条件。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.prefixKey("$.name");
    query.prefixKey("0");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

setSuggestIndex

setSuggestIndex(index: string): Query

设置一个指定的索引，将优先用于查询。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.setSuggestIndex("$.name");
    query.setSuggestIndex("0");
    console.info(`query is ${query.getSqlLike()}`);
    query = null;
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

deviceId

deviceId(deviceId:string):Query

添加设备ID作为key的前缀。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    query.deviceId("deviceId");
    console.info(`query is ${query.getSqlLike()}`);
} catch (e) {
    console.error(`duplicated calls should be ok.code is ${e.code},message is ${e.message}`);
}

getSqlLike

getSqlLike():string

获取Query对象的查询语句。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

返回值：

示例：

try {
    let query = new distributedKVStore.Query();
    let sql1 = query.getSqlLike();
    console.info(`GetSqlLike sql= ${sql1}`);
} catch (e) {
    console.error("duplicated calls should be ok : " + e);
}

SingleKVStore

SingleKVStore数据库实例，提供增加数据、删除数据和订阅数据变更、订阅数据同步完成的方法。

在调用SingleKVStore的方法前，需要先通过getKVStore构建一个SingleKVStore实例。

put

put(key: string, value: Uint8Array | string | number | boolean, callback: AsyncCallback<void>): void

添加指定类型键值对到数据库，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err) {
        if (err != undefined) {
            console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info("Succeeded in putting");
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

put

put(key: string, value: Uint8Array | string | number | boolean): Promise<void>

添加指定类型键值对到数据库，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT).then(() => {
        console.info(`Succeeded in putting data.`);
    }).catch((err) => {
        console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

putBatch

putBatch(entries: Entry[], callback: AsyncCallback<void>): void

批量插入键值对到SingleKVStore数据库中，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries, async function (err) {
        if (err != undefined) {
            console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting Batch');
        kvStore.getEntries('batch_test_string_key', function (err, entries) {
            if (err != undefined) {
                console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
            }
            console.info('Succeeded in getting Entries');
            console.info(`entries.length: ${entries.length}`);
            console.info(`entries[0]: ${entries[0]}`);
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message} `);
}

putBatch

putBatch(entries: Entry[]): Promise<void>

批量插入键值对到SingleKVStore数据库中，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting Batch');
        kvStore.getEntries('batch_test_string_key').then((entries) => {
            console.info('Succeeded in getting Entries');
            console.info(`PutBatch ${entries}`);
        }).catch((err) => {
            console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message} `);
}

delete

delete(key: string, callback: AsyncCallback<void>): void

从数据库中删除指定键值的数据，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err) {
        if (err != undefined) {
            console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting');
        kvStore.delete(KEY_TEST_STRING_ELEMENT, function (err) {
            if (err != undefined) {
                console.error(`Failed to delete.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in deleting');
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

delete

delete(key: string): Promise<void>

从数据库中删除指定键值的数据，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT).then(() => {
        console.info(`Succeeded in putting data`);
        kvStore.delete(KEY_TEST_STRING_ELEMENT).then(() => {
            console.info('Succeeded in deleting');
        }).catch((err) => {
            console.error(`Failed to delete.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

deleteBatch

deleteBatch(keys: string[], callback: AsyncCallback<void>): void

批量删除SingleKVStore数据库中的键值对，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    let keys = [];
    for (var i = 0; i < 5; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
        keys.push(key + i);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries, async function (err) {
        if (err != undefined) {
            console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting Batch');
        kvStore.deleteBatch(keys, async function (err) {
            if (err != undefined) {
                console.error(`Failed to delete Batch.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in deleting Batch');
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

deleteBatch

deleteBatch(keys: string[]): Promise<void>

批量删除SingleKVStore数据库中的键值对，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    let keys = [];
    for (var i = 0; i < 5; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
        keys.push(key + i);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting Batch');
        kvStore.deleteBatch(keys).then(() => {
            console.info('Succeeded in deleting Batch');
        }).catch((err) => {
            console.error(`Failed to delete Batch.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

removeDeviceData

removeDeviceData(deviceId: string, callback: AsyncCallback<void>): void

删除指定设备的数据，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string_2';
const VALUE_TEST_STRING_ELEMENT = 'value-string-002';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, async function (err) {
        console.info('Succeeded in putting data');
        const deviceId = 'no_exist_device_id';
        kvStore.removeDeviceData(deviceId, async function (err) {
            if (err == undefined) {
                console.info('succeeded in removing device data');
            } else {
                console.error(`Failed to remove device data.code is ${err.code},message is ${err.message} `);
                kvStore.get(KEY_TEST_STRING_ELEMENT, async function (err, data) {
                    console.info('Succeeded in getting data');
                });
            }
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`)
}

removeDeviceData

removeDeviceData(deviceId: string): Promise<void>

删除指定设备的数据，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.DistributedKVStore

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string_2';
const VALUE_TEST_STRING_ELEMENT = 'value-string-001';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT).then(() => {
        console.info('Succeeded in putting data');
    }).catch((err) => {
        console.error(`Failed to put data.code is ${err.code},message is ${err.message} `);
    });
    const deviceId = 'no_exist_device_id';
    kvStore.removeDeviceData(deviceId).then(() => {
        console.info('succeeded in removing device data');
    }).catch((err) => {
        console.error(`Failed to remove device data.code is ${err.code},message is ${err.message} `);
    });
    kvStore.get(KEY_TEST_STRING_ELEMENT).then((data) => {
        console.info('Succeeded in getting data');
    }).catch((err) => {
        console.error(`Failed to get data.code is ${err.code},message is ${err.message} `);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`)
}

get

get(key: string, callback: AsyncCallback<boolean | string | number | Uint8Array>): void

获取指定键的值，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, function (err) {
        if (err != undefined) {
            console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info("Succeeded in putting");
        kvStore.get(KEY_TEST_STRING_ELEMENT, function (err, data) {
            if (err != undefined) {
                console.error(`Failed to get.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info(`Succeeded in getting data.data=${data}`);
        });
    });
} catch (e) {
    console.error(`Failed to get.code is ${e.code},message is ${e.message}`);
}

get

get(key: string): Promise<boolean | string | number | Uint8Array>

获取指定键的值，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

const KEY_TEST_STRING_ELEMENT = 'key_test_string';
const VALUE_TEST_STRING_ELEMENT = 'value-test-string';
try {
    kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT).then(() => {
        console.info(`Succeeded in putting data`);
        kvStore.get(KEY_TEST_STRING_ELEMENT).then((data) => {
            console.info(`Succeeded in getting data.data=${data}`);
        }).catch((err) => {
            console.error(`Failed to get.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to put.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`Failed to get.code is ${e.code},message is ${e.message}`);
}

getEntries

getEntries(keyPrefix: string, callback: AsyncCallback<Entry[]>): void

获取匹配指定键前缀的所有键值对，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries, async function (err) {
        if (err != undefined) {
            console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting Batch');
        kvStore.getEntries('batch_test_string_key', function (err, entries) {
            if (err != undefined) {
                console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in getting Entries');
            console.info(`entries.length: ${entries.length}`);
            console.info(`entries[0]: ${entries[0]}`);
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message} `);
}

getEntries

getEntries(keyPrefix: string): Promise<Entry[]>

获取匹配指定键前缀的所有键值对，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    console.info(`entries: ${entries}`);
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting Batch');
        kvStore.getEntries('batch_test_string_key').then((entries) => {
            console.info('Succeeded in getting Entries');
            console.info(`PutBatch ${entries}`);
        }).catch((err) => {
            console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to put Batch.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message} `);
}

getEntries

getEntries(query: Query, callback: AsyncCallback<Entry[]>): void

获取与指定Query对象匹配的键值对列表，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    var arr = new Uint8Array([21, 31]);
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_bool_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.BYTE_ARRAY,
                value: arr
            }
        }
        entries.push(entry);
    }
    console.info(`entries: {entries}`);
    kvStore.putBatch(entries, async function (err) {
        console.info('Succeeded in putting Batch');
        const query = new distributedKVStore.Query();
        query.prefixKey("batch_test");
        kvStore.getEntries(query, function (err, entries) {
            if (err != undefined) {
                console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in getting Entries');
            console.info(`entries.length: ${entries.length}`);
            console.info(`entries[0]: ${entries[0]}`);
        });
    });
} catch (e) {
    console.error(`Failed to get Entries.code is ${e.code},message is ${e.message}`);
}

getEntries

getEntries(query: Query): Promise<Entry[]>

获取与指定Query对象匹配的键值对列表，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    var arr = new Uint8Array([21, 31]);
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_bool_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.BYTE_ARRAY,
                value: arr
            }
        }
        entries.push(entry);
    }
    console.info(`entries: {entries}`);
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting Batch');
        const query = new distributedKVStore.Query();
        query.prefixKey("batch_test");
        kvStore.getEntries(query).then((entries) => {
            console.info('Succeeded in getting Entries');
        }).catch((err) => {
            console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`);
        });
    }).catch((err) => {
        console.error(`Failed to get Entries.code is ${err.code},message is ${err.message}`)
    });
    console.info('Succeeded in getting Entries');
} catch (e) {
    console.error(`Failed to get Entries.code is ${e.code},message is ${e.message}`);
}

getResultSet

getResultSet(keyPrefix: string, callback: AsyncCallback<KVStoreResultSet>): void

从SingleKVStore数据库中获取具有指定前缀的结果集，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let resultSet;
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    kvStore.putBatch(entries, async function (err) {
        if (err != undefined) {
            console.error(`Failed to put batch.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting batch');
        kvStore.getResultSet('batch_test_string_key', async function (err, result) {
            if (err != undefined) {
                console.error(`Failed to get resultset.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in getting result set');
            resultSet = result;
            kvStore.closeResultSet(resultSet, function (err) {
                if (err != undefined) {
                    console.error(`Failed to close resultset.code is ${err.code},message is ${err.message}`);
                    return;
                }
                console.info('Succeeded in closing result set');
            })
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

getResultSet

getResultSet(keyPrefix: string): Promise<KVStoreResultSet>

从SingleKVStore数据库中获取具有指定前缀的结果集，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let resultSet;
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting batch');
    }).catch((err) => {
        console.error(`Failed to put batch.code is ${err.code},message is ${err.message}`);
    });
    kvStore.getResultSet('batch_test_string_key').then((result) => {
        console.info('Succeeded in getting result set');
        resultSet = result;
    }).catch((err) => {
        console.error(`Failed to get resultset.code is ${err.code},message is ${err.message}`);
    });
    kvStore.closeResultSet(resultSet).then(() => {
        console.info('Succeeded in closing result set');
    }).catch((err) => {
        console.error(`Failed to close resultset.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.code}`);
}

getResultSet

getResultSet(query: Query, callback: AsyncCallback<KVStoreResultSet>): void

获取与指定Query对象匹配的KVStoreResultSet对象，使用callback异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let resultSet;
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    kvStore.putBatch(entries, async function (err) {
        if (err != undefined) {
            console.error(`Failed to put batch.code is ${err.code},message is ${err.message}`);
            return;
        }
        console.info('Succeeded in putting batch');
        const query = new distributedKVStore.Query();
        query.prefixKey("batch_test");
        kvStore.getResultSet(query, async function (err, result) {
            if (err != undefined) {
                console.error(`Failed to get resultset.code is ${err.code},message is ${err.message}`);
                return;
            }
            console.info('Succeeded in getting result set');
        });
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.message}`);
}

getResultSet

getResultSet(query: Query): Promise<KVStoreResultSet>

获取与指定Query对象匹配的KVStoreResultSet对象，使用Promise异步回调。

系统能力： SystemCapability.DistributedDataManager.KVStore.Core

参数：

返回值：

错误码：

以下错误码的详细介绍请参见分布式键值数据库错误码。

示例：

try {
    let resultSet;
    let entries = [];
    for (var i = 0; i < 10; i++) {
        var key = 'batch_test_string_key';
        var entry = {
            key: key + i,
            value: {
                type: distributedKVStore.ValueType.STRING,
                value: 'batch_test_string_value'
            }
        }
        entries.push(entry);
    }
    kvStore.putBatch(entries).then(async () => {
        console.info('Succeeded in putting batch');
    }).catch((err) => {
        console.error(`Failed to put batch.code is ${err.code},message is ${err.message}`);
    });
    const query = new distributedKVStore.Query();
    query.prefixKey("batch_test");
    kvStore.getResultSet(query).then((result) => {
        console.info('Succeeded in getting result set');
        resultSet = result;
    }).catch((err) => {
        console.error(`Failed to get resultset.code is ${err.code},message is ${err.message}`);
    });
} catch (e) {
    console.error(`An unexpected error occurred.code is ${e.code},message is ${e.code}`);
}