This is a part of an online Codename One course published around 2017 see it all for free at https://debugagent.com/series/cn1

1. SQLite & ORM Binding - Part I

2. SQLite Mapping
✦SQLite property objects can be mapped to SQLite tables
✦I also had to moved a couple of properties to getters/
setters as at the time I built the app the API didn’t allow
excluding an entry
✦I abstracted the mapping further by creating my own
persistence class
© Codename One 2017 all rights reserved

3. public class AppStorage {
private static SQLMap smap;
private static Database db;
private static AppStorage instance = new AppStorage();
private EventDispatcher dispatcher = new EventDispatcher();
private AppStorage() {}
public static AppStorage getInstance() {
initStorage();
return instance;
}
private static void initStorage() {
if(smap == null) {
try {
db = Display.getInstance().openOrCreate("RestDb.sql");
smap = SQLMap.create(db);
AppSettings app = new AppSettings();
Dish dish = new Dish();
smap.setPrimaryKey(app, app.id);
smap.setPrimaryKey(dish, dish.id);
smap.setSqlType(dish.price, SQLMap.SqlType.SQL_DOUBLE);
smap.createTable(app);
smap.createTable(dish);
} catch(IOException err) {
Log.e(err);
}
}
}
AppStorage

4. public class AppStorage {
private static SQLMap smap;
private static Database db;
private static AppStorage instance = new AppStorage();
private EventDispatcher dispatcher = new EventDispatcher();
private AppStorage() {}
public static AppStorage getInstance() {
initStorage();
return instance;
}
private static void initStorage() {
if(smap == null) {
try {
db = Display.getInstance().openOrCreate("RestDb.sql");
smap = SQLMap.create(db);
AppSettings app = new AppSettings();
Dish dish = new Dish();
smap.setPrimaryKey(app, app.id);
smap.setPrimaryKey(dish, dish.id);
smap.setSqlType(dish.price, SQLMap.SqlType.SQL_DOUBLE);
smap.createTable(app);
smap.createTable(dish);
} catch(IOException err) {
Log.e(err);
}
}
}
AppStorage

5. public class AppStorage {
private static SQLMap smap;
private static Database db;
private static AppStorage instance = new AppStorage();
private EventDispatcher dispatcher = new EventDispatcher();
private AppStorage() {}
public static AppStorage getInstance() {
initStorage();
return instance;
}
private static void initStorage() {
if(smap == null) {
try {
db = Display.getInstance().openOrCreate("RestDb.sql");
smap = SQLMap.create(db);
AppSettings app = new AppSettings();
Dish dish = new Dish();
smap.setPrimaryKey(app, app.id);
smap.setPrimaryKey(dish, dish.id);
smap.setSqlType(dish.price, SQLMap.SqlType.SQL_DOUBLE);
smap.createTable(app);
smap.createTable(dish);
} catch(IOException err) {
Log.e(err);
}
}
}
AppStorage

6. public class AppStorage {
private static SQLMap smap;
private static Database db;
private static AppStorage instance = new AppStorage();
private EventDispatcher dispatcher = new EventDispatcher();
private AppStorage() {}
public static AppStorage getInstance() {
initStorage();
return instance;
}
private static void initStorage() {
if(smap == null) {
try {
db = Display.getInstance().openOrCreate("RestDb.sql");
smap = SQLMap.create(db);
AppSettings app = new AppSettings();
Dish dish = new Dish();
smap.setPrimaryKey(app, app.id);
smap.setPrimaryKey(dish, dish.id);
smap.setSqlType(dish.price, SQLMap.SqlType.SQL_DOUBLE);
smap.createTable(app);
smap.createTable(dish);
} catch(IOException err) {
Log.e(err);
}
}
}
AppStorage

7. public void insert(PropertyBusinessObject d) {
try {
smap.insert(d);
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error saving: " + err);
}
}
public void update(PropertyBusinessObject d) {
try {
smap.update(d);
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error updating storage: " + err);
}
}
public void addDeleteListener(ActionListener<ActionEvent> onDelete) {
dispatcher.addListener(onDelete);
}
public void removeDeleteListener(ActionListener<ActionEvent> onDelete) {
dispatcher.removeListener(onDelete);
}
AppStorage

8. public void insert(PropertyBusinessObject d) {
try {
smap.insert(d);
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error saving: " + err);
}
}
public void update(PropertyBusinessObject d) {
try {
smap.update(d);
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error updating storage: " + err);
}
}
public void addDeleteListener(ActionListener<ActionEvent> onDelete) {
dispatcher.addListener(onDelete);
}
public void removeDeleteListener(ActionListener<ActionEvent> onDelete) {
dispatcher.removeListener(onDelete);
}
AppStorage

9. public void delete(PropertyBusinessObject d) {
try {
smap.delete(d);
dispatcher.fireActionEvent(new ActionEvent(d));
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error deleting: " + err);
}
}
public AppSettings fetchAppSettings() {
try {
AppSettings a = new AppSettings();
a.name.set(null);
a.tagline.set(null);
List<PropertyBusinessObject> lp = smap.select(a, null, true, 1000, 0);
if(lp.size() == 0) {
a = new AppSettings();
a.id.set("1");
insert(a);
return a;
}
return (AppSettings)lp.get(0);
} catch(Exception err) {
Log.e(err);
ToastBar.showErrorMessage("Error loading AppSettings: " + err);
return null;
}
AppStorage

10. public void delete(PropertyBusinessObject d) {
try {
smap.delete(d);
dispatcher.fireActionEvent(new ActionEvent(d));
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error deleting: " + err);
}
}
public AppSettings fetchAppSettings() {
try {
AppSettings a = new AppSettings();
a.name.set(null);
a.tagline.set(null);
List<PropertyBusinessObject> lp = smap.select(a, null, true, 1000, 0);
if(lp.size() == 0) {
a = new AppSettings();
a.id.set("1");
insert(a);
return a;
}
return (AppSettings)lp.get(0);
} catch(Exception err) {
Log.e(err);
ToastBar.showErrorMessage("Error loading AppSettings: " + err);
return null;
}
AppStorage

11. public void delete(PropertyBusinessObject d) {
try {
smap.delete(d);
dispatcher.fireActionEvent(new ActionEvent(d));
} catch(IOException err) {
Log.e(err);
ToastBar.showErrorMessage("Error deleting: " + err);
}
}
public AppSettings fetchAppSettings() {
try {
AppSettings a = new AppSettings();
a.name.set(null);
a.tagline.set(null);
List<PropertyBusinessObject> lp = smap.select(a, null, true, 1000, 0);
if(lp.size() == 0) {
a = new AppSettings();
a.id.set("1");
insert(a);
return a;
}
return (AppSettings)lp.get(0);
} catch(Exception err) {
Log.e(err);
ToastBar.showErrorMessage("Error loading AppSettings: " + err);
return null;
}
AppStorage

12. public List<PropertyBusinessObject> fetchDishes() {
try {
Dish d = new Dish();
List<PropertyBusinessObject> lp = smap.select(d, d.name, true, 1000, 0);
// workaround for null images
for(PropertyBusinessObject p : lp) {
Dish dd = (Dish)p;
if(dd.getFullSize() == null) {
dd.setFullSize(Resources.getGlobalResources().getImage("food1.jpg"));
}
}
return lp;
} catch(Exception err) {
Log.e(err);
ToastBar.showErrorMessage("Error loading dishes: " + err);
return null;
}
}
AppStorage

13. public List<PropertyBusinessObject> fetchDishes() {
try {
Dish d = new Dish();
List<PropertyBusinessObject> lp = smap.select(d, d.name, true, 1000, 0);
// workaround for null images
for(PropertyBusinessObject p : lp) {
Dish dd = (Dish)p;
if(dd.getFullSize() == null) {
dd.setFullSize(Resources.getGlobalResources().getImage("food1.jpg"));
}
}
return lp;
} catch(Exception err) {
Log.e(err);
ToastBar.showErrorMessage("Error loading dishes: " + err);
return null;
}
}
AppStorage

14. Local & Remote DB
✦Keeping both a local and remote DB is risky but since
we currently have the assumption of one user per
restaurant it’s lower
✦We don’t really support working offline, this is mostly
meant for faster loading and reduced server load
© Codename One 2017 all rights reserved