Create SQLite database in android

Solution 1:

Better example is here

 try {
   myDB = this.openOrCreateDatabase("DatabaseName", MODE_PRIVATE, null);

   /* Create a Table in the Database. */
   myDB.execSQL("CREATE TABLE IF NOT EXISTS "
     + TableName
     + " (Field1 VARCHAR, Field2 INT(3));");

   /* Insert data to a Table*/
   myDB.execSQL("INSERT INTO "
     + TableName
     + " (Field1, Field2)"
     + " VALUES ('Saranga', 22);");

   /*retrieve data from database */
   Cursor c = myDB.rawQuery("SELECT * FROM " + TableName , null);

   int Column1 = c.getColumnIndex("Field1");
   int Column2 = c.getColumnIndex("Field2");

   // Check if our result was valid.
   c.moveToFirst();
   if (c != null) {
    // Loop through all Results
    do {
     String Name = c.getString(Column1);
     int Age = c.getInt(Column2);
     Data =Data +Name+"/"+Age+"\n";
    }while(c.moveToNext());
   }

Solution 2:

If you want to keep the database between uninstalls you have to put it on the SD Card. This is the only place that won't be deleted at the moment your app is deleted. But in return it can be deleted by the user every time.

If you put your DB on the SD Card you can't use the SQLiteOpenHelper anymore, but you can use the source and the architecture of this class to get some ideas on how to implement the creation, updating and opening of a databse.

Solution 3:

    public class MyDatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "MyDb.db";

    private static final int DATABASE_VERSION = 1;

    // Database creation sql statement
    private static final String DATABASE_CREATE_FRIDGE_ITEM = "create table FridgeItem(id integer primary key autoincrement,f_id text not null,food_item text not null,quantity text not null,measurement text not null,expiration_date text not null,current_date text not null,flag text not null,location text not null);";

    public MyDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    // Method is called during creation of the database
    @Override
    public void onCreate(SQLiteDatabase database) {
        database.execSQL(DATABASE_CREATE_FRIDGE_ITEM);
    }

    // Method is called during an upgrade of the database,
    @Override
    public void onUpgrade(SQLiteDatabase database,int oldVersion,int newVersion){
        Log.w(MyDatabaseHelper.class.getName(),"Upgrading database from version " + oldVersion + " to "
                         + newVersion + ", which will destroy all old data");
        database.execSQL("DROP TABLE IF EXISTS FridgeItem");
        onCreate(database);
    }
}



    public class CommentsDataSource {

    private MyDatabaseHelper dbHelper;

    private SQLiteDatabase database;

    public String stringArray[];

    public final static String FOOD_TABLE = "FridgeItem"; // name of table
    public final static String FOOD_ITEMS_DETAILS = "FoodDetails"; // name of table

    public final static String P_ID = "id"; // pid
    public final static String FOOD_ID = "f_id"; // id value for food item
    public final static String FOOD_NAME = "food_item"; // name of food
    public final static String FOOD_QUANTITY = "quantity"; // quantity of food item
    public final static String FOOD_MEASUREMENT = "measurement"; // measurement of food item
    public final static String FOOD_EXPIRATION = "expiration_date"; // expiration date of food item
    public final static String FOOD_CURRENTDATE = "current_date"; //  date of food item added
    public final static String FLAG = "flag"; 
    public final static String LOCATION = "location";
    /**
     * 
     * @param context
     */
    public CommentsDataSource(Context context) {
        dbHelper = new MyDatabaseHelper(context);
        database = dbHelper.getWritableDatabase();
    }

    public long insertFoodItem(String id, String name,String quantity, String measurement, String currrentDate,String expiration,String flag,String location) {
        ContentValues values = new ContentValues();
        values.put(FOOD_ID, id);
        values.put(FOOD_NAME, name);
        values.put(FOOD_QUANTITY, quantity);
        values.put(FOOD_MEASUREMENT, measurement);
        values.put(FOOD_CURRENTDATE, currrentDate);
        values.put(FOOD_EXPIRATION, expiration);
        values.put(FLAG, flag);
        values.put(LOCATION, location);
        return database.insert(FOOD_TABLE, null, values);
    }

    public long insertFoodItemsDetails(String id, String name,String quantity, String measurement, String currrentDate,String expiration) {
        ContentValues values = new ContentValues();
        values.put(FOOD_ID, id);
        values.put(FOOD_NAME, name);
        values.put(FOOD_QUANTITY, quantity);
        values.put(FOOD_MEASUREMENT, measurement);
        values.put(FOOD_CURRENTDATE, currrentDate);
        values.put(FOOD_EXPIRATION, expiration);
        return database.insert(FOOD_ITEMS_DETAILS, null, values);

    }

    public Cursor selectRecords(String id) {
        String[] cols = new String[] { FOOD_ID, FOOD_NAME, FOOD_QUANTITY, FOOD_MEASUREMENT, FOOD_EXPIRATION,FLAG,LOCATION,P_ID};
        Cursor mCursor = database.query(true, FOOD_TABLE, cols, P_ID+"=?", new String[]{id}, null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor; // iterate to get each value.
    }

    public Cursor selectAllName() {
        String[] cols = new String[] { FOOD_NAME};
        Cursor mCursor = database.query(true, FOOD_TABLE, cols, null, null, null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor; // iterate to get each value.
    }

    public Cursor selectAllRecords(String loc) {
        String[] cols = new String[] { FOOD_ID, FOOD_NAME, FOOD_QUANTITY, FOOD_MEASUREMENT, FOOD_EXPIRATION,FLAG,LOCATION,P_ID};
        Cursor mCursor = database.query(true, FOOD_TABLE, cols, LOCATION+"=?", new String[]{loc}, null, null, null, null);
        int size=mCursor.getCount();
        stringArray = new String[size];
        int i=0;
        if (mCursor != null) {
            mCursor.moveToFirst();
            FoodInfo.arrayList.clear();
                while (!mCursor.isAfterLast()) {
                    String name=mCursor.getString(1);
                    stringArray[i]=name;
                    String quant=mCursor.getString(2);
                    String measure=mCursor.getString(3);
                    String expir=mCursor.getString(4);
                    String id=mCursor.getString(7);
                    FoodInfo fooditem=new FoodInfo();
                    fooditem.setName(name);
                    fooditem.setQuantity(quant);
                    fooditem.setMesure(measure);
                    fooditem.setExpirationDate(expir);
                    fooditem.setid(id);
                    FoodInfo.arrayList.add(fooditem);
                    mCursor.moveToNext();
                    i++;
                }
        }
        return mCursor; // iterate to get each value.
    }

    public Cursor selectExpDate() {
        String[] cols = new String[] {FOOD_NAME, FOOD_QUANTITY, FOOD_MEASUREMENT, FOOD_EXPIRATION};
        Cursor mCursor = database.query(true, FOOD_TABLE, cols, null, null, null, null,  FOOD_EXPIRATION, null);
        int size=mCursor.getCount();
        stringArray = new String[size];
        if (mCursor != null) {
            mCursor.moveToFirst();
            FoodInfo.arrayList.clear();
                while (!mCursor.isAfterLast()) {
                    String name=mCursor.getString(0);
                    String quant=mCursor.getString(1);
                    String measure=mCursor.getString(2);
                    String expir=mCursor.getString(3);
                    FoodInfo fooditem=new FoodInfo();
                    fooditem.setName(name);
                    fooditem.setQuantity(quant);
                    fooditem.setMesure(measure);
                    fooditem.setExpirationDate(expir);
                    FoodInfo.arrayList.add(fooditem);
                    mCursor.moveToNext();
                }
        }
        return mCursor; // iterate to get each value.
    }

    public int UpdateFoodItem(String id, String quantity, String expiration){
       ContentValues values=new ContentValues();
       values.put(FOOD_QUANTITY, quantity);
       values.put(FOOD_EXPIRATION, expiration);
       return database.update(FOOD_TABLE, values, P_ID+"=?", new String[]{id});   
      }

    public void deleteComment(String id) {
        System.out.println("Comment deleted with id: " + id);
        database.delete(FOOD_TABLE, P_ID+"=?", new String[]{id});
        }

}

Solution 4:

this is the full source code to direct use,

    public class CardDBDAO {

        protected SQLiteDatabase database;
        private DataBaseHelper dbHelper;
        private Context mContext;

        public CardDBDAO(Context context) {
            this.mContext = context;
            dbHelper = DataBaseHelper.getHelper(mContext);
            open();

        }

        public void open() throws SQLException {
            if(dbHelper == null)
                dbHelper = DataBaseHelper.getHelper(mContext);
            database = dbHelper.getWritableDatabase();
        }

    }



    public class DataBaseHelper extends SQLiteOpenHelper {

        private static final String DATABASE_NAME = "mydbnamedb";
        private static final int DATABASE_VERSION = 1;

        public static final String CARDS_TABLE = "tbl_cards";
        public static final String POICATEGORIES_TABLE = "tbl_poicategories";
        public static final String POILANGS_TABLE = "tbl_poilangs";

        public static final String ID_COLUMN = "id";

        public static final String POI_ID = "poi_id";
        public static final String POICATEGORIES_COLUMN = "poi_categories";

        public static final String POILANGS_COLUMN = "poi_langs";

        public static final String CARDS = "cards";
        public static final String CARD_ID = "card_id";
        public static final String CARDS_PCAT_ID = "pcat_id";

        public static final String CREATE_PLANG_TABLE = "CREATE TABLE "
                + POILANGS_TABLE + "(" + ID_COLUMN + " INTEGER PRIMARY KEY,"
                + POILANGS_COLUMN + " TEXT, " + POI_ID + " TEXT)";

        public static final String CREATE_PCAT_TABLE = "CREATE TABLE "
                + POICATEGORIES_TABLE + "(" + ID_COLUMN + " INTEGER PRIMARY KEY,"
                + POICATEGORIES_COLUMN + " TEXT, " + POI_ID + " TEXT)";

        public static final String CREATE_CARDS_TABLE = "CREATE TABLE "
                + CARDS_TABLE + "(" + ID_COLUMN + " INTEGER PRIMARY KEY," + CARD_ID
                + " TEXT, " + CARDS_PCAT_ID + " TEXT, " + CARDS + " TEXT)";

        private static DataBaseHelper instance;

        public static synchronized DataBaseHelper getHelper(Context context) {
            if (instance == null)
                instance = new DataBaseHelper(context);
            return instance;
        }

        private DataBaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onOpen(SQLiteDatabase db) {
            super.onOpen(db);
            if (!db.isReadOnly()) {
                // Enable foreign key constraints
                // db.execSQL("PRAGMA foreign_keys=ON;");
            }
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(CREATE_PCAT_TABLE);
            db.execSQL(CREATE_PLANG_TABLE);
            db.execSQL(CREATE_CARDS_TABLE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        }
    }




    public class PoiLangDAO extends CardDBDAO {

            private static final String WHERE_ID_EQUALS = DataBaseHelper.ID_COLUMN
                    + " =?";

            public PoiLangDAO(Context context) {
                super(context);
            }

            public long save(PLang plang_data) {

                ContentValues values = new ContentValues();
                values.put(DataBaseHelper.POI_ID, plang_data.getPoi_id());
                values.put(DataBaseHelper.POILANGS_COLUMN, plang_data.getLangarr());

                return database
                        .insert(DataBaseHelper.POILANGS_TABLE, null, values);
            }

            public long update(PLang plang_data) {
                ContentValues values = new ContentValues();
                values.put(DataBaseHelper.POI_ID, plang_data.getPoi_id());
                values.put(DataBaseHelper.POILANGS_COLUMN, plang_data.getLangarr());

                long result = database.update(DataBaseHelper.POILANGS_TABLE,
                        values, WHERE_ID_EQUALS,
                        new String[] { String.valueOf(plang_data.getId()) });
                Log.d("Update Result:", "=" + result);
                return result;

            }

            public int deleteDept(PLang plang_data) {
                return database.delete(DataBaseHelper.POILANGS_TABLE,
                        WHERE_ID_EQUALS, new String[] { plang_data.getId() + "" });
            }

            public List<PLang> getPLangs1() {
                List<PLang> plang_list = new ArrayList<PLang>();
                Cursor cursor = database.query(DataBaseHelper.POILANGS_TABLE,
                        new String[] { DataBaseHelper.ID_COLUMN, DataBaseHelper.POI_ID,
                                DataBaseHelper.POILANGS_COLUMN }, null, null, null,
                        null, null);

                while (cursor.moveToNext()) {
                    PLang plang_bin = new PLang();
                    plang_bin.setId(cursor.getInt(0));
                    plang_bin.setPoi_id(cursor.getString(1));
                    plang_bin.setLangarr(cursor.getString(2));
                    plang_list.add(plang_bin);
                }
                return plang_list;
            }

            public List<PLang> getPLangs(String pid) {
                List<PLang> plang_list = new ArrayList<PLang>();

                String selection = DataBaseHelper.POI_ID + "=?";
                String[] selectionArgs = { pid };

                Cursor cursor = database.query(DataBaseHelper.POILANGS_TABLE,
                        new String[] { DataBaseHelper.ID_COLUMN, DataBaseHelper.POI_ID,
                                DataBaseHelper.POILANGS_COLUMN }, selection,
                        selectionArgs, null, null, null);

                while (cursor.moveToNext()) {
                    PLang plang_bin = new PLang();
                    plang_bin.setId(cursor.getInt(0));
                    plang_bin.setPoi_id(cursor.getString(1));
                    plang_bin.setLangarr(cursor.getString(2));
                    plang_list.add(plang_bin);
                }
                return plang_list;
            }

            public void loadPLangs(String poi_id, String langarrs) {
                PLang plangbin = new PLang(poi_id, langarrs);

                List<PLang> plang_arr = new ArrayList<PLang>();
                plang_arr.add(plangbin);

                for (PLang dept : plang_arr) {
                    ContentValues values = new ContentValues();
                    values.put(DataBaseHelper.POI_ID, dept.getPoi_id());
                    values.put(DataBaseHelper.POILANGS_COLUMN, dept.getLangarr());
                    database.insert(DataBaseHelper.POILANGS_TABLE, null, values);
                }
            }

        }




        public class PLang {

            public PLang() {
                super();
            }

            public PLang(String poi_id, String langarrs) {
                // TODO Auto-generated constructor stub

                this.poi_id = poi_id;
                this.langarr = langarrs;
            }

            public int getId() {
                return id;
            }

            public void setId(int id) {
                this.id = id;
            }

            public String getPoi_id() {
                return poi_id;
            }

            public void setPoi_id(String poi_id) {
                this.poi_id = poi_id;
            }

            public String getLangarr() {
                return langarr;
            }

            public void setLangarr(String langarr) {
                this.langarr = langarr;
            }

            private int id;
            private String poi_id;
            private String langarr;

    }

Solution 5:

Why not refer to the documentation or the sample code shipping with the SDK? There's code in the samples on how to create/update/fill/read databases using the helper class described in the document I linked.