Vmeda.Online/src/providers/db.ts

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// (C) Copyright 2015 Martin Dougiamas
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import { Injectable } from '@angular/core';
import { SQLite } from '@ionic-native/sqlite';
import { Platform } from 'ionic-angular';
import { SQLiteDB } from '@classes/sqlitedb';
import { SQLiteDBMock } from '@core/emulator/classes/sqlitedb';
/**
* This service allows interacting with the local database to store and retrieve data.
*/
@Injectable()
export class CoreDbProvider {
protected dbInstances = {};
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constructor(private sqlite: SQLite, private platform: Platform) { }
/**
* Get or create a database object.
*
* The database objects are cached statically.
*
* @param {string} name DB name.
* @param {boolean} forceNew True if it should always create a new instance.
* @return {SQLiteDB} DB.
*/
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getDB(name: string, forceNew?: boolean): SQLiteDB {
if (typeof this.dbInstances[name] === 'undefined' || forceNew) {
if (this.platform.is('cordova')) {
this.dbInstances[name] = new SQLiteDB(name, this.sqlite, this.platform);
} else {
this.dbInstances[name] = new SQLiteDBMock(name);
}
}
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return this.dbInstances[name];
}
/**
* Delete a DB.
*
* @param {string} name DB name.
* @return {Promise<any>} Promise resolved when the DB is deleted.
*/
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deleteDB(name: string): Promise<any> {
let promise;
if (typeof this.dbInstances[name] != 'undefined') {
// Close the database first.
promise = this.dbInstances[name].close();
} else {
promise = Promise.resolve();
}
return promise.then(() => {
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const db = this.dbInstances[name];
delete this.dbInstances[name];
if (this.platform.is('cordova')) {
return this.sqlite.deleteDatabase({
name: name,
location: 'default'
});
} else {
// In WebSQL we cannot delete the database, just empty it.
return db.emptyDatabase();
}
});
}
}