Insert or update in SQlite and Android using the database.query();

Question

is there a way to change my function:

public categorie createCategoria(String categoria) {
            ContentValues values = new ContentValues();
            values.put(MySQLiteHelper.COLUMN_NOME, categoria);
            values.put(MySQLiteHelper.COLUMN_PREF, 0);

            long insertId = database.insert(MySQLiteHelper.TABLE_CATEGORIE, null,
                values);

            Cursor cursor = database.query(MySQLiteHelper.TABLE_CATEGORIE,
                allCategorieColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
                null, null, null);
            cursor.moveToFirst();
            categorie newCategoria = cursorToCategorie(cursor);
            cursor.close();
            return newCategoria;
          } 

this is a raw insert, i would like to change this function to make it update or insert accordingly. i would like to change this becouse i'm already using this function in some places, but now i need to choose if insert a row or update (or ignoring the insert) a row with the same COLUMN_NOME. can someone help me doing this?

i mean i would like to insert a new row ONLY if there isn't another with the same name (as usual you know).

Answer 1

You can use insertWithOnConflict() if you want to insert or update, depending in whether the record exists or not:

SQLiteDatabase db = this.getWritableDatabase();

ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_ID, id);
contentValues.put(COLUMN_VALUE, value);

// this will insert if record is new, update otherwise
db.insertWithOnConflict(TABLE, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE);

Answer 2

you could call int nRowsEffected = database.update(...); if there are no rows effected by the update either the row doesn't exist (or you hosed your update()!) therefore you need to call database.insert(...). of course if nRowsEffected > 0 then you are done.