1/* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 17class Database { 18 addData(data) { 19 console.log('addData: ', data); 20 } 21 22 removeData(data) { 23 console.log('removeData: ', data); 24 } 25 26 querySql(sql) { 27 return 'querySql: ' + sql; 28 } 29 30 updateData(oldData, newData) { 31 console.log('updateData: ', oldData, '->', newData); 32 } 33} 34 35class DatabaseInterface extends Database { 36 getText() { } 37} 38 39export { DatabaseInterface as DBInterface }; 40 41export function getDatabaseInstance() { 42 return new Database(); 43} 44 45function getblankInstance1() { } 46export { getblankInstance1 as getblankInstanceInterface }; 47 48export default function getblankInstance2() { } 49 50let newDB = new Database(); 51newDB.addData();