从SQLite中的列获取所有值并作为列表返回

Question

我正在尝试使用每列中的数据填充RecyclerView。

我想检索列下的所有值并动态地将其作为List返回。

最好的方法是什么？

附件是数据的示例图像：

我在应用程序中显示了一个表格列表，然后用户应该能够点击一个表格名称，并通过可滑动的标签查看每列下所有值的RecyclerView。

对于上图，用户应该看到CreateDate的回收者视图，然后滑动并查看CreatedByTablet的回收者视图等。

我遇到的问题是如何返回列中的所有值，动态。我对SQL并不熟悉，那么我将如何实现这一目标呢？该方法如何知道返回List<String>或List<Integer>？

这是我写的一些代码来尝试这个：

// Get all table names
public List<String> getAllTableNames() {

    List<String> tableNames = new ArrayList<>();
    try {
        String query = "SELECT name FROM sqlite_master WHERE type='table'";
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery(query, null);

        // Iterate
        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                tableNames.add(cursor.getString(cursor.getColumnIndex("name")));
                cursor.moveToNext();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return tableNames;
}

// Get all names of columns inside a table
public List<String> getAllColumnNames(String tableName) {

    List<String> names = new ArrayList<>();
    try {
        String query = "SELECT * FROM " + tableName;
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery(query, null, null);
        String[] columnNames = cursor.getColumnNames();
        names = Arrays.asList(columnNames);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return names;
}

public int getColumnType(String tableName, String columnName) {

    String[] args = { columnName };

    try {
        int type;
        String query = "SELECT * FROM " + tableName;
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery(query, args);
        Log.d(TAG, "Column Index: " + String.valueOf(cursor.getColumnIndex(columnName)));
        type = cursor.getType(cursor.getColumnIndex(columnName));
        return type;
    } catch (Exception e) {
        e.printStackTrace();
    }

    return 0;
}

public List getAllRows(String tableName, String columnName, int type) {

    Log.d(TAG, "Getting all rows");
    switch (type) {
        case 1:
            List<Integer> integerList = createIntegerList(tableName, columnName);
            return integerList;
        case 3:
            List<String> stringList = createStringList(tableName, columnName);
            return stringList;
    }

    return null;
}

private List<Integer> createIntegerList(String tableName, String columnName) {

    List<Integer> integerList = new ArrayList<>();
    try {
        String query = "SELECT * FROM " + tableName;
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery(query, null);

        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                int number = cursor.getInt(cursor.getColumnIndex(columnName));
                integerList.add(number);
                cursor.moveToNext();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return integerList;
}

private List<String> createStringList(String tableName, String columnName) {

    List<String> integerList = new ArrayList<>();
    try {
        String query = "SELECT * FROM " + tableName;
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery(query, null);

        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                String name = cursor.getString(cursor.getColumnIndex(columnName));
                integerList.add(name);
                cursor.moveToNext();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return integerList;
}

如何在Sqlite android中的表内的列中返回所有值的整数或字符串列表（取决于列数据类型）？