How read/write long text from/to DB

[laodizhu]

Hello everyone:
     I'm using mxODBC.Windows to R/W long/text(<100KByte) to MSSql.
I tryed use data type "text", "binary" to create table column, and 
when I insert record to database, I get error message like "data 
length too long " or "type mismatch" etc.
     Any one can make suggestion in long text binary database programing
in python? I had read mxODBC help, but still not know what should I do.
Code sample is special valueable for me.
     Other DB Module solution is also welcome.

     Thanks at advance.

     laodizhu at sina.com