12/15/2023 0 Comments Sqlite tutorial pptWe will save the recorded data with name id.mp4, where id is the id from the database.Allow record audio, location, internet, camera.Make function insertData() ContentValues values = new ContentValues() values.put("type", "audio") values.put("filename", "1.mp4") values.put("lat","75001200") values.put("long","36000000") long newId = myDatabase.insert("things", null, values) Log.d(“SQLPlay”,”insert returned id “+newId).Filename of the thing Location of the thingĪdd data Id of entry Name of table long newId = myDatabase.insert("things", null, values) Set of pairs (column name, data for that column) ContentValues values = new ContentValues() values.put("type", "audio") values.put("filename", "1.mp4") values.put("lat","75001200") values.put("long","36000000") One way to do this is to include a column that is an integer that autoincrements If “IF NOT EXIST” is missing, then this will crash if the table already exists Name of table myDatabase.execSQL("CREATE TABLE IF NOT EXISTS things" + "( id INTEGER PRIMARY KEY AUTOINCREMENT," + " type VARCHAR(40), " + " filename VARCHAR(40), " + " lat INTEGER, " + " long INTEGER) ") Key is named id and is integer Type is audio, pic, tex, etc.Also, there must be a primary column (a key) such that each entry in this column is unique. Must specify the column name and type (e.g., integer).Is database already exists, it does not make it.here we use a specific path so we can examine the db at the command line.If no path, then db is in /data/data//databases.myDatabase = openOrCreateDatabase( “/mnt/sdcard/things.db", SQLiteDatabase.CREATE_IF_NECESSARY, null).There’s other stuff, but this is enough for us.Get data from table (or tables), via query.SQL allows data to be stored and retrieved.Data is in tables with rows and columns.SQLite is a scaled down version of SQL.Things database Look in database and get thing from nearby and that matched other criteria For now, we will just use near by lat and long Cache things and get things from the web.Include various information about the things.Allow things that are played to be selected in a sophisticate way.When someone is near the location, perhaps play the thing.Record a thing (e.g., audio, picture, text, video, web link, etc.) at a location.SQLiteDatabase db = this.getReadableDatabase() Ĭursor cursor = db.rawQuery(countQuery, null) String countQuery = "SELECT * FROM " + TABLE_CONTACTS Public class DatabaseHandler extends SQLiteOpenHelper ) Let's see the simple example of android sqlite database. Int update(String table, ContentValues values, String whereClause, String whereArgs)Ĭursor query(String table, String columns, String selection, String selectionArgs, String groupBy, String having, String orderBy) The third argument specifies the values to be stored. If second argument is null, android will store null values if values are empty. The table specifies the table name, nullColumnHack doesn't allow completely null values. Long insert(String table, String nullColumnHack, ContentValues values) There are many methods in SQLiteDatabase class. It contains methods to be performed on sqlite database such as create, update, delete, select etc. Public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion)Ĭalled when database needs to be downgraded. Public abstract void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)Ĭalled when database needs to be upgraded. Public abstract void onCreate(SQLiteDatabase db)Ĭalled only once when database is created for the first time. There are many methods in SQLiteOpenHelper class. SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler)Ĭreates an object for creating, opening and managing the database. SQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version)Ĭreates an object for creating, opening and managing the database. There are two constructors of SQLiteOpenHelper class. For performing any database operation, you have to provide the implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class. The class is used for database creation and version management. SQLiteOpenHelper class provides the functionality to use the SQLite database. For displaying data on the spinner or listview, move to the next page. Here, we are going to see the example of sqlite to store and fetch the data. So, there is no need to perform any database setup or administration task. used to perform database operations on android devices such as storing, manipulating or retrieving persistent data from the database. SQLite is an open-source relational database i.e.
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