Local variable syntax error

Question

I'm trying to create a procedure from the MySQL API in C. My query string is as follows (in the C code):

"CREATE PROCEDURE clockOut (taskID INT UNSIGNED) "
"BEGIN "
"DECLARE @username VARCHAR(8);"
"SELECT @username = userID FROM TaskItem WHERE id=taskID;"
"UPDATE TaskItem SET onClock=0,stopTime=NOW() "
"WHERE id=taskID AND userID=@username;"
"END"

This string will ultimately be transmitted with mysql_query() , which returns error code 1064, a syntax error. What have I done wrong?

Answer 1

正如@alk所建议的那样，我从变量中删除了@语法，并且效果很好。