Question

I select data from my sqlite database. My problem is that when in database are apostrophes (“I’ m John” – for example) and i try to select data, then my application crash.

If i don’ t have apostrophes in database, then everything is all right.

My select data function:

String query = "SELECT * FROM " + mainCollumn  + " WHERE used=0 " + " AND season <= " + seasons + " ORDER BY RANDOM() LIMIT " + count ;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(query, null);

    if(cursor.moveToFirst()){
        do {
            Question question = new Question(Integer.parseInt(cursor.getString(0)),
                    cursor.getString(1),cursor.getString(2),cursor.getString(3),cursor.getString(4),cursor.getString(5),
                    Integer.parseInt(cursor.getString(6)));

            questionList.add(question);
        }while(cursor.moveToNext());
    }

Thanks for any help.

Answer 1

You can specially handle apostrophes by replacing them with double apostrophes, but the best way is to use query() with selectionArgs instead of rawQuery().

SQLiteDatabase db = this.getReadableDatabase();
String[] columns = new String[] {column1, column2}; // the columns you want
Cursor cursor = db.query(mainCollumn, String[] columns, "used=0 and season<=?", new String[] {seasons}, null, null, "RANDOM() LIMIT " + count);