UNKNOWN COLUMN 'ENULL' IN 'FIELD LIST'

[khor shan]

hi..
i'm newbie here.

i need help badly here.

this is my code:

SAConnection con;
SACommand cmd(&con);//,"Select file_id,"+q.front()+" from file");

string s = q.front();
q.pop();
while(!q.empty()){

s = s + "," + q.front();
q.pop();

}
cout<< s <<endl;
try
{
con.Connect("search","kks","",SA_MySQL_Client);


s = "Insert into file(filename)values(" + s ; s = s + ")";
cout<< s <<endl;
cmd.setCommandText(s.c_str());
cmd.Execute();



i need to insert pathname like "E:\Education\hello.txt" in mysql but the erorr UNKNOWN COLUMN 'ENULL' IN 'FIELD LIST' appeared.

pls help me to solve this problem.

i'll very appreciate any help given..
thank you