forked from EVOgeek/Vmeda.Online
83 lines
2.6 KiB
TypeScript
83 lines
2.6 KiB
TypeScript
// (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 = {};
|
||
|
||
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.
|
||
*/
|
||
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);
|
||
}
|
||
}
|
||
return this.dbInstances[name];
|
||
}
|
||
|
||
/**
|
||
* Delete a DB.
|
||
*
|
||
* @param {string} name DB name.
|
||
* @return {Promise<any>} Promise resolved when the DB is deleted.
|
||
*/
|
||
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(() => {
|
||
let 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();
|
||
}
|
||
});
|
||
}
|
||
}
|