mirror of
https://gitee.com/openharmony/interface_sdk-js
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283 lines
10 KiB
TypeScript
283 lines
10 KiB
TypeScript
/*
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* Copyright (c) 2022 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Indicates the {@code DataType}.
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*
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* <p>{@code DataType} is obtained based on the value.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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export enum DataType {
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/**
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* Indicates that the data type is null.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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TYPE_NULL = 0,
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/**
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* Indicates that the data type is long.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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TYPE_LONG = 1,
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/**
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* Indicates that the data type is double.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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TYPE_DOUBLE = 2,
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/**
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* Indicates that the data type is byte string.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* */
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TYPE_STRING = 3,
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/**
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* Indicates that the data type is blob.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* */
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TYPE_BLOB = 4
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}
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/**
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* Provides methods for accessing a datashare result set generated by querying the database.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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export default interface DataShareResultSet {
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/**
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* Obtains the names of all columns or keys in a result set.
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*
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* @note The column or key names are returned as a string array, in which the strings are in the same order
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* as the columns or keys in the result set.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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columnNames: Array<string>;
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/**
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* Obtains the number of columns or keys in the result set.
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*
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* @note The returned number is equal to the length of the string array returned by the columnCount method.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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columnCount: number;
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/**
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* Obtains the number of rows in the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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rowCount: number;
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/**
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* Checks whether the current result set is closed.
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*
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* If the result set is closed by calling the close method, true will be returned.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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*/
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isClosed: boolean;
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/**
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* Go to the first row of the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @return Returns true if the result set is moved successfully;
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* returns false otherwise, for example, if the result set is empty.
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*/
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goToFirstRow(): boolean;
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/**
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* Go to the last row of the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @return Returns true if the result set is moved successfully;
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* returns false otherwise, for example, if the result set is empty.
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*/
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goToLastRow(): boolean;
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/**
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* Go to the next row of the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @return Returns true if the result set is moved successfully;
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* returns false otherwise, for example, if the result set is already in the last row.
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*/
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goToNextRow(): boolean;
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/**
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* Go to the previous row of the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @return Returns true if the result set is moved successfully;
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* returns false otherwise, for example, if the result set is already in the first row.
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*/
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goToPreviousRow(): boolean;
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/**
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* Go to the specified row of the result set forwards or backwards by an offset relative to its current position.
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* A positive offset indicates moving backwards, and a negative offset indicates moving forwards.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param offset Indicates the offset relative to the current position.
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* @return Returns true if the result set is moved successfully and does not go beyond the range;
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* returns false otherwise.
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*/
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goTo(offset: number): boolean;
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/**
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* Go to the specified row of the result set.
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*
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param position Indicates the index of the specified row, which starts from 1.
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* @return Returns true if the result set is moved successfully; returns false otherwise.
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*/
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goToRow(position: number): boolean;
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/**
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* Obtains the value of the specified column or key in the current row as a byte array.
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*
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* @note The implementation class determines whether to throw an exception if the value of the specified
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* column or key in the current row is null or the specified column or key is not of the Blob type.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the specified column index or key index, which starts from 0.
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* @return Returns the value of the specified column or key as a byte array.
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*/
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getBlob(columnIndex: number): Uint8Array;
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/**
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* Obtains the value of the specified column or key in the current row as string.
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*
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* @note The implementation class determines whether to throw an exception if the value of the specified
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* column or key in the current row is null or the specified column or key is not of the string type.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the specified column index or key index, which starts from 0.
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* @return Returns the value of the specified column or key as a string.
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*/
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getString(columnIndex: number): string;
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/**
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* Obtains the value of the specified column or key in the current row as long.
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*
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* @note The implementation class determines whether to throw an exception if the value of the specified
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* column or key in the current row is null, the specified column or key is not of the long type.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the specified column index or key index, which starts from 0.
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* @return Returns the value of the specified column or key as a long.
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*/
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getLong(columnIndex: number): number;
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/**
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* Obtains the value of the specified column or key in the current row as double.
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*
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* @note The implementation class determines whether to throw an exception if the value of the specified
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* column or key in the current row is null, the specified column or key is not of the double type.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the specified column index or key index, which starts from 0.
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* @return Returns the value of the specified column or key as a double.
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*/
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getDouble(columnIndex: number): number;
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/**
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* Closes the result set.
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*
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* @note Calling this method on the result set will release all of its resources and makes it ineffective.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @return Returns true if the result set is closed; returns false otherwise.
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*/
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close(): void;
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/**
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* Obtains the column index or key index based on the specified column name or key name.
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*
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* @note The column name or key name is passed as an input parameter.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnName Indicates the name of the specified column or key in the result set.
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* @return Returns the index of the specified column or key.
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*/
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getColumnIndex(columnName: string): number;
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/**
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* Obtains the column name or key name based on the specified column index or key index.
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*
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* @note The column index or key index is passed as an input parameter.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the index of the specified column or key in the result set.
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* @return Returns the name of the specified column or key.
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*/
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getColumnName(columnIndex: number): string;
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/**
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* Obtains the dataType of the specified column or key.
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*
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* @note The implementation class determines whether to throw an exception if the value of the specified
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* column or key in the current row is null, the specified column or key is not in the data type.
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* @since 9
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* @syscap SystemCapability.DistributedDataManager.DataShare.Core
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* @systemapi
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* @param columnIndex Indicates the specified column index or key index, which starts from 0.
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* @return Returns the dataType of the specified column or key.
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*/
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getDataType(columnIndex: number): DataType;
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} |