每日日报2021 6/10

数据分页：

public List<Person> getScrollData(int offset,int maxResult)
{
    List<Person> person = new ArrayList<Person>();
    SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
    Cursor cursor =  db.rawQuery("SELECT * FROM person ORDER BY personid ASC LIMIT= ?,?",
        new String[]{String.valueOf(offset),String.valueOf(maxResult)});
    while(cursor.moveToNext())
    {
        int personid = cursor.getInt(cursor.getColumnIndex("personid"));
        String name = cursor.getString(cursor.getColumnIndex("name"));
        String phone = cursor.getString(cursor.getColumnIndex("phone"));
        person.add(new Person(personid,name,phone)) ;
    }
    cursor.close();
    return person;
}

查询记录数：

public long getCount()
{
    SQLiteDatabase db = dbOpenHelper.getReadableDatabase();
    Cursor cursor =  db.rawQuery("SELECT COUNT (*) FROM person",null);
    cursor.moveToFirst();
    long result = cursor.getLong(0);
    cursor.close();
    return result;      
}