ESQL/C and Grant or Revoke statment

Hi there, when I want to grant or rovoke a permission via an esql/c-program, I can't pass the username to the statement. For example: EXEC SQL REVOKE ALL ON iso FROM :user; where user is a declared ESQL-variable returns an error from the preprocessor: esqlc: "grant.ec", line 27: Error -33051: Syntax error on identifier or symbol ':'. Any idea? Please cc-me Your answer! Thanks a lot! Rainer Nasch ---------------------------------------------------------- Rainer Nasch Universitaet Osnabrueck Tel: +49 541 969 2487 FB Mathematik / Informatik Fax: +49 541 969 2770 49069 Osnabrueck email: nasch@uni-osnabrueck.de ----------------------------------------------------------