Question

如何循环从id表中获取users列值，其中＆＃34; id＆＃34;通过以下方式生成：

id integer primary key autoincrement

我的表中有这样的记录：

id     name

1       Me

2      You

以下是我认为应该尝试的内容：

public String[] getUsersId() {

    String selectQuery = "SELECT id FROM " + TABLE_USERS;
          SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.rawQuery(selectQuery, null);
             String[] data = null;

    if (cursor.moveToFirst()) {
        do {

        } while (cursor.moveToNext());
    }

    db.close();
    return data;
}

现在，我想知道如何记录所有＆＃34; id＆＃34;在我的活动中？

Answer 1

使用cursor.getInt从Cursor获取int值：

if (cursor.moveToFirst()) {
        do {
             int id_row=cursor.getInt(cursor.getColumnIndex("id"));
             //int id_row=cursor.getInt(0);
             Log.d("TAG","id is ::"+id_row);
        } while (cursor.moveToNext());
    }

Answer 2

You can try in this way 
    if (cursor.moveToFirst()) 
    {
        do
        {
            int idIndex = cursor.getColumnIndex("id");
            if ( ideIndex != -1)
            {
                int ID = cursor.getInt(idIndex);
            }
        } while (cursor.moveToNext());
    }

Answer 3

试试这个，

请检查此条件，如果您的cursor.getCount> 0

if (cursor.getCount() > 0) {
                cursor.moveToFirst();
                do {
                    String strId = cursor.getString(cursor.getColumnIndex("yourid");

                } while (cursor.moveToNext());
            }

用于记录活动中id列值的游标

3 个答案: