84 lines
2.6 KiB
TypeScript
84 lines
2.6 KiB
TypeScript
// (C) Copyright 2015 Martin Dougiamas
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//
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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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import { Injectable } from '@angular/core';
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import { SQLite } from '@ionic-native/sqlite';
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import { Platform } from 'ionic-angular';
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import { SQLiteDB } from '@classes/sqlitedb';
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import { SQLiteDBMock } from '@core/emulator/classes/sqlitedb';
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/**
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* This service allows interacting with the local database to store and retrieve data.
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*/
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@Injectable()
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export class CoreDbProvider {
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protected dbInstances = {};
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constructor(private sqlite: SQLite, private platform: Platform) { }
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/**
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* Get or create a database object.
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*
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* The database objects are cached statically.
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*
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* @param {string} name DB name.
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* @param {boolean} forceNew True if it should always create a new instance.
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* @return {SQLiteDB} DB.
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*/
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getDB(name: string, forceNew?: boolean): SQLiteDB {
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if (typeof this.dbInstances[name] === 'undefined' || forceNew) {
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if (this.platform.is('cordova')) {
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this.dbInstances[name] = new SQLiteDB(name, this.sqlite, this.platform);
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} else {
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this.dbInstances[name] = new SQLiteDBMock(name);
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}
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}
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return this.dbInstances[name];
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}
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/**
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* Delete a DB.
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*
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* @param {string} name DB name.
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* @return {Promise<any>} Promise resolved when the DB is deleted.
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*/
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deleteDB(name: string): Promise<any> {
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let promise;
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if (typeof this.dbInstances[name] != 'undefined') {
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// Close the database first.
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promise = this.dbInstances[name].close();
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} else {
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promise = Promise.resolve();
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}
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return promise.then(() => {
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const db = this.dbInstances[name];
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delete this.dbInstances[name];
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if (this.platform.is('cordova')) {
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return this.sqlite.deleteDatabase({
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name: name,
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location: 'default'
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});
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} else {
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// In WebSQL we cannot delete the database, just empty it.
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return db.emptyDatabase();
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}
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});
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}
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}
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