Created
November 10, 2016 13:14
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SQLite Database Sample
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public class DatabaseManager { | |
private AtomicInteger mOpenCounter = new AtomicInteger(); | |
private static DatabaseManager instance; | |
private static SQLiteOpenHelper mDatabaseHelper; | |
private SQLiteDatabase mDatabase; | |
public static synchronized void initializeInstance(SQLiteOpenHelper helper) { | |
if (instance == null) { | |
instance = new DatabaseManager(); | |
mDatabaseHelper = helper; | |
} | |
} | |
public static synchronized DatabaseManager getInstance() { | |
if (instance == null) { | |
throw new IllegalStateException(DatabaseManager.class.getSimpleName() + | |
" is not initialized, call initializeInstance(..) method first."); | |
} | |
return instance; | |
} | |
public synchronized SQLiteDatabase openDatabase() { | |
if (mOpenCounter.incrementAndGet() == 1) { | |
// Opening new database | |
mDatabase = mDatabaseHelper.getWritableDatabase(); | |
} | |
return mDatabase; | |
} | |
public synchronized void closeDatabase() { | |
if (mOpenCounter.decrementAndGet() == 0) { | |
// Closing database | |
mDatabase.close(); | |
} | |
} | |
} |
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public class DBUtils { | |
public static ArrayList<String> getColumns(SQLiteDatabase db, String tableName) { | |
ArrayList<String> al = null; | |
Cursor c = null; | |
try { | |
c = db.rawQuery("SELECT * FROM " + tableName + " LIMIT 1", null); | |
if (c != null) { | |
al = new ArrayList<>(Arrays.asList(c.getColumnNames())); | |
} | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} finally { | |
if (c != null) | |
c.close(); | |
} | |
return al; | |
} | |
public static String join(ArrayList<String> al, String delim) { | |
StringBuilder sb = new StringBuilder(); | |
int num = al.size(); | |
for (int i = 0; i < num; i++) { | |
if (i != 0) | |
sb.append(delim); | |
sb.append(al.get(i)); | |
} | |
return sb.toString(); | |
} | |
} |
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public class FavouriteHandler { | |
public static final String TABLE_FAVOURITE = "FAVOURITE_TABLE"; | |
public static final String KEY_ID = "_id"; | |
public static final String KEY_POST_ID = "post_id"; | |
public static final String KEY_META_KEY = "meta_key"; | |
public static final String KEY_LAT = "property_latitude"; | |
public static final String KEY_LONG = "property_longitude"; | |
public static final String KEY_TITLE = "post_title"; | |
public static final String KEY_CONTENT = "post_content"; | |
public static final String KEY_THUMBNAIL = "thumbnail"; | |
public static final String KEY_STATUS = "property_status"; | |
public static final String KEY_COUNTRY = "property_country"; | |
public static final String KEY_ADDRESS = "property_address"; | |
public static final String KEY_CATEGORY = "property_category"; | |
public void createTable(SQLiteDatabase db) { | |
String CREATE_FAV_MEWS_TABLE = "CREATE TABLE IF NOT EXISTS " | |
+ TABLE_FAVOURITE + " (" | |
+ KEY_ID | |
+ " INTEGER PRIMARY KEY autoincrement," | |
+ KEY_POST_ID + " TEXT," | |
+ KEY_META_KEY + " TEXT," | |
+ KEY_LAT + " TEXT," | |
+ KEY_LONG + " TEXT," | |
+ KEY_TITLE + " TEXT," | |
+ KEY_CONTENT + " TEXT," | |
+ KEY_THUMBNAIL + " TEXT," | |
+ KEY_STATUS + " TEXT," | |
+ KEY_COUNTRY + " TEXT," | |
+ KEY_ADDRESS + " TEXT," | |
+ KEY_CATEGORY + " TEXT" + ")"; | |
db.execSQL(CREATE_FAV_MEWS_TABLE); | |
} | |
public void upgradeTable(SQLiteDatabase db) { | |
FavouriteHandler fh = new FavouriteHandler(); | |
fh.createTable(db); | |
ArrayList<String> columns = DBUtils.getColumns(db, TABLE_FAVOURITE); | |
String alterQuery = "ALTER TABLE " + TABLE_FAVOURITE + " RENAME TO temp_" + TABLE_FAVOURITE; | |
db.execSQL(alterQuery); | |
fh.createTable(db); | |
columns.retainAll(DBUtils.getColumns(db, TABLE_FAVOURITE)); | |
String cols = join(columns, ","); | |
db.execSQL(String.format("INSERT INTO %s (%s) SELECT %s FROM temp_%s", | |
TABLE_FAVOURITE, cols, cols, TABLE_FAVOURITE)); | |
String dropQuery = "DROP TABLE temp_" + TABLE_FAVOURITE; | |
db.execSQL(dropQuery); | |
} | |
public synchronized long addFav(Mews mews) { | |
ContentValues values = new ContentValues(); | |
values.put(KEY_POST_ID, mews.post_id); | |
values.put(KEY_META_KEY, mews.meta_key); | |
values.put(KEY_LAT, mews.property_latitude); | |
values.put(KEY_LONG, mews.property_longitude); | |
values.put(KEY_TITLE, mews.post_title); | |
values.put(KEY_CONTENT, mews.post_content); | |
values.put(KEY_THUMBNAIL, mews.thumbnail); | |
values.put(KEY_STATUS, mews.property_status); | |
values.put(KEY_COUNTRY, mews.property_country); | |
values.put(KEY_ADDRESS, mews.property_address); | |
values.put(KEY_CATEGORY, mews.property_category); | |
SQLiteDatabase db = DatabaseManager.getInstance().openDatabase(); | |
long id = db.insert(TABLE_FAVOURITE, null, values); | |
DatabaseManager.getInstance().closeDatabase(); | |
return id; | |
} | |
public synchronized int unFav(Mews mews) { | |
SQLiteDatabase db = DatabaseManager.getInstance().openDatabase(); | |
int res = db.delete(TABLE_FAVOURITE, KEY_POST_ID + " = ?", | |
new String[]{String.valueOf(mews.post_id)}); | |
DatabaseManager.getInstance().closeDatabase(); | |
return res; | |
} | |
public synchronized ArrayList<Mews> getAllFavMews() { | |
ArrayList<Mews> arrMews = new ArrayList<>(); | |
String raw_query = "SELECT * FROM " + TABLE_FAVOURITE + ";"; | |
SQLiteDatabase db = DatabaseManager.getInstance().openDatabase(); | |
Cursor c = db.rawQuery(raw_query, null); | |
try { | |
if (c.moveToFirst()) { | |
do { | |
Mews mews = new Mews(); | |
mews.distance = 0; | |
mews._id = c.getInt(c.getColumnIndex(KEY_ID)); | |
mews.post_id = c.getString(c.getColumnIndex(KEY_POST_ID)); | |
mews.meta_key = c.getString(c.getColumnIndex(KEY_META_KEY)); | |
mews.property_latitude = c.getDouble(c.getColumnIndex(KEY_LAT)); | |
mews.property_longitude = c.getDouble(c.getColumnIndex(KEY_LONG)); | |
mews.post_title = c.getString(c.getColumnIndex(KEY_TITLE)); | |
mews.post_content = c.getString(c.getColumnIndex(KEY_CONTENT)); | |
mews.thumbnail = c.getString(c.getColumnIndex(KEY_THUMBNAIL)); | |
mews.property_status = c.getString(c.getColumnIndex(KEY_STATUS)); | |
mews.property_country = c.getString(c.getColumnIndex(KEY_COUNTRY)); | |
mews.property_address = c.getString(c.getColumnIndex(KEY_ADDRESS)); | |
mews.property_category = c.getString(c.getColumnIndex(KEY_CATEGORY)); | |
arrMews.add(mews); | |
} while (c.moveToNext()); | |
} | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} finally { | |
c.close(); | |
} | |
DatabaseManager.getInstance().closeDatabase(); | |
return arrMews; | |
} | |
public boolean isFav(Mews mews) { | |
boolean isFav = false; | |
String raw_query = "SELECT * FROM " + TABLE_FAVOURITE + " WHERE " + KEY_POST_ID + " = '" + mews.post_id + "'" + ";"; | |
SQLiteDatabase db = DatabaseManager.getInstance().openDatabase(); | |
Cursor c = db.rawQuery(raw_query, null); | |
try { | |
if (c.moveToFirst()) { | |
isFav = true; | |
} | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} finally { | |
c.close(); | |
} | |
DatabaseManager.getInstance().closeDatabase(); | |
return isFav; | |
} | |
} |
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public class MyApplication extends Application { | |
@Override | |
public void onCreate() { | |
super.onCreate(); | |
DatabaseManager.initializeInstance(new SQLiteHelper(this, BuildConfig.VERSION_CODE)); | |
} | |
} |
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public class SQLiteHelper extends SQLiteOpenHelper { | |
private static final String DATABASE_NAME = "_mews.db"; | |
public SQLiteHelper(Context context, int versionCode) { | |
super(context, DATABASE_NAME, null, versionCode); | |
} | |
@Override | |
public void onCreate(SQLiteDatabase db) { | |
FavouriteHandler fh = new FavouriteHandler(); | |
fh.createTable(db); | |
} | |
@Override | |
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { | |
FavouriteHandler favouriteHandler = new FavouriteHandler(); | |
favouriteHandler.upgradeTable(db); | |
} | |
public void DeleteAll() { | |
SQLiteDatabase db = this.getWritableDatabase(); | |
try { | |
String dropSql = "DROP TABLE " + FavouriteHandler.TABLE_FAVOURITE; | |
db.execSQL(dropSql); | |
} catch (Exception e) { | |
e.printStackTrace(); | |
} | |
onCreate(db); | |
} | |
} |
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