anki collection.anki2数据库

    flds            text not null,
    -- the values of the fields in this note. separated by 0x1f (31) character.
    -- For example, contains: <question>/x1f<answer>.

    sfld            integer not null,
    -- sort field: used for quick sorting and duplicate check
    -- The value of the field having the index 'sortf' as defined by the model
sfld应该是flds的第一个部分（去除了html符号）