如何为 Android SQLite 数据库编写方法

Question

我正在创建一个示例画廊应用程序，我正在尝试将画廊项目存储在本地 sqlite 数据库中

示例查询：

select filed1 from tablename where filed2="66547";

        public List<String> getAllLabels(String number){
        List<String> labels = new ArrayList<String>();

        String foldername;

        // Select All Query
        String selectQuery = " SELECT " + Databaseconnect.FILEPATH + " FROM "+     Databaseconnect.TABLE_FILE + " WHERE" + Databaseconnect.FOLDERLINK="+"number;



        SQLiteDatabase db = dbHelper.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {
                labels.add(cursor.getString(0));
            } while (cursor.moveToNext());
        }

        // closing connection
        cursor.close();
        db.close();

        // returning lables
        return labels;
    }

我还是有错误，如何在这个查询中写 List.. 请给我解决方案

Answer 1

试试这个：

String selectQuery =" SELECT " + Databaseconnect.FILEPATH + " FROM "+Databaseconnect.TABLE_FILE + " WHERE " + Databaseconnect.FOLDERLINK + "=" + String.valueOf(number) + ";";