[Serusers] How to set the query into database and get answers with exec_msg?

Hi ,I am a student studying in VoIP and implementing my theory in SER. I try to access mysql database to get some information, but have a problem aboout paramaters of exe_msg. My goal is :count the number of contact addresses that certain user registered, and take this is my solution: exec_msg(' Count="select count(contact) from location where username=\"$SIP_HF_CONTACT\" "' CountResult=`mysql -user -pheslo -e "$Count" ser`; ') What is the result of "CountResult" ? I suppose originally that it will be the the number of the query, but it seems not......... and i try the exec_msg('rm -r test'); but it failed; Dose the function wored? and how to use it,Hhw can I get my answer what I want to get ? Hoping someone can give me some advises ^^. Thannks in advance. 2009-02-26 邱磊