/
storage.js
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/
storage.js
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/*
* This file is part of harbour-dwd.
* Copyright (C) 2021 blueprint@poetaster.de based on code from
* Copyright (C) 2018-2019 Mirian Margiani (harbour-meteoswiss)
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with harbour-dwd. If not, see <http://www.gnu.org/licenses/>.
*
*/
.pragma library
.import QtQuick.LocalStorage 2.0 as LS
function defaultFor(arg, val) { return typeof arg !== 'undefined' ? arg : val; }
var initialized = false
function getDatabase() {
var db = LS.LocalStorage.openDatabaseSync("harbour-dwd", "1.0", "DWD Location Cache", 10000);
if (!initialized) {
initialized = true;
doInit(db);
}
return db;
}
function doInit(db) {
// Database tables: (primary key in all-caps)
// locations: LOCATION_ID, name, latitude, longitude
// settings: SETTING, value
db.transaction(function(tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS locations(\
location_id INTEGER NOT NULL PRIMARY KEY, name TEXT NOT NULL,\
lat REAL NOT NULL, lon REAL NOT NULL)');
tx.executeSql('CREATE TABLE IF NOT EXISTS settings(setting TEXT NOT NULL PRIMARY KEY, value TEXT)');
});
}
function simpleQuery(query, values, getSelectedCount) {
var db = getDatabase();
var res = undefined;
values = defaultFor(values, []);
if (!query) {
console.log("error: empty query");
return undefined;
}
try {
db.transaction(function(tx) {
var rs = tx.executeSql(query, values);
if (rs.rowsAffected > 0) {
res = rs.rowsAffected;
} else {
res = 0;
}
if (getSelectedCount === true) {
res = rs.rows.length;
}
});
} catch(e) {
console.log("error in query: '"+ e +"', values=", values);
res = undefined;
}
return res;
}
function vacuumDatabase() {
var db = getDatabase();
try {
db.transaction(function(tx) {
// VACUUM cannot be executed inside a transaction, but the LocalStorage
// module cannot execute queries without one. Thus we have to manually
// end the transaction from inside the transaction...
var rs = tx.executeSql("END TRANSACTION;");
var rs2 = tx.executeSql("VACUUM;");
});
} catch(e) {
console.log("error in query: '"+ e);
}
}
function addLocation(locationData) {
var lat = defaultFor(locationData.lat, 0);
var lon = defaultFor(locationData.lon, 0);
var name = defaultFor(locationData.name, null);
//var id = getLocationsCount() + 100;
var res = simpleQuery('INSERT INTO locations VALUES (?,?,?,?);', [, name, lat, lon ]);
if (res !== 0 && !res) {
console.log("error: failed to save location " + name + " to db");
}
return res;
}
function removeLocation(locationId) {
var res = simpleQuery('DELETE FROM locations WHERE location_id=?;', [locationId]);
if (!res) {
console.log("error: failed to remove location " + locationId + " from db");
}
return res;
}
function getCoverLocation() {
var db = getDatabase();
var res = 0;
try {
db.transaction(function(tx) {
var rs = tx.executeSql('SELECT * FROM settings WHERE setting="cover_location" LIMIT 1;');
if (rs.rows.length > 0) {
res = parseInt(rs.rows.item(0).value, 10);
} else {
res = 0;
}
});
} catch(e) {
console.log("error while loading cover location data");
return 0;
}
return res;
}
function getNextCoverLocation(locationId) {
var db = getDatabase();
var res = 0;
try {
db.transaction(function(tx) {
var rs = tx.executeSql('SELECT * FROM locations WHERE location_id > ? ORDER BY location_id LIMIT 1;', [locationId]);
if (rs.rows.length === 0) {
rs = tx.executeSql('SELECT * FROM locations ORDER BY location_id LIMIT 1;');
if (rs.rows.length === 0) {
res = 0;
console.log("failed to get next cover location: no locations available");
return res;
}
}
res = rs.rows.item(0).location_id;
});
} catch(e) {
console.log("error while loading next cover location");
return 0;
}
return res;
}
function delCoverLocation(locationId) {
//var res = simpleQuery('DELETE FROM locations WHERE location_id=?;', [locationId]);
var res = simpleQuery('DELETE from settings where cover_location=?;', [locationId]);
if (!res) {
console.log("error: failed to remove location " + locationId + " from db");
}
return res;
}
function setCoverLocation(locationId) {
var db = getDatabase();
var res = undefined;
try {
db.transaction(function(tx) {
var rs = tx.executeSql('REPLACE INTO settings VALUES (?,?);', ['cover_location', locationId]);
if (rs.rowsAffected > 0) {
res = rs.rowsAffected;
} else {
res = 0;
}
});
} catch(e) {
console.log("error in query:", values)
res = undefined;
}
if (res !== 0 && !res) {
console.log("error: failed to save cover settings")
}
return res;
}
function getLocationsList() {
var db = getDatabase();
var res = [];
try {
db.transaction(function(tx) {
var rs = tx.executeSql('SELECT * FROM locations;', []);
for (var i = 0; i < rs.rows.length; i++) {
res.push(rs.rows.item(i).location_id);
}
});
} catch(e) {
console.log("error while loading locations list")
}
return res;
}
function getLocationsCount() {
var db = getDatabase();
var res = 0;
try {
db.transaction(function(tx) {
var rs = tx.executeSql('SELECT * FROM locations;', []);
res = rs.rows.length;
});
} catch(e) {
console.log("error while loading locations count")
}
return res;
}
function getLocationData(locationId) {
var db = getDatabase();
var res = {location_id:"",lat:"",lon:"",name:""};
try {
db.transaction(function(tx) {
var rs = undefined;
if (locationId) {
rs = tx.executeSql('SELECT * FROM locations WHERE location_id=?;', [locationId]);
} else {
rs = tx.executeSql('SELECT * FROM locations ORDER BY name ASC;');
}
for (var i = 0; i < rs.rows.length; i++) {
res.location_id = rs.rows.item(i).location_id;
res.name = rs.rows.item(i).name;
res.lat = rs.rows.item(i).lat;
res.lon = rs.rows.item(i).lon;
/*res.push({
locationId: rs.rows.item(i).location_id,
lat: rs.rows.item(i).lat,
lon: rs.rows.item(i).lon,
name: rs.rows.item(i).name,
});*/
}
});
} catch(e) {
console.log("error while loading locations data for " + locationId)
return [];
}
return res;
}