i need some helps about chatroom

hi ,i have a problem about chatroom.
i changed the database to mysql,everything is ok.but not the chatroom.
we also can talk each other in chatroom,i edit the module mod_muc to mod_muc_odbc,it dosen't work.
the data about chatroom didn't insert into the mysql,the table muc_room and muc_registered is empty.\
can you tell me where is the data.
is something wrong i did?

here is my config about mod_muc:
{mod_muc_odbc, [
{host, "conference.@HOST@"},
{access, muc},
{access_create, muc_create},
{access_persistent, muc_create},
{access_admin, muc_admin}
]},

and i found that if someone offline,he will be changed out of the chatroom.how can he stay in the chatroom when he offline untill he quit the chatroom by himself.

sorry,my english is not good,but my work stop by this problem , please help me soon,thanks.

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