19.2.4. CALL Statement Syntax
CALL sp_name([parameter[,...]])
The CALL statement invokes a procedure that
was defined previously with CREATE PROCEDURE.
CALL can pass back values to its caller using
parameters that are declared as OUT or
INOUT parameters. It also
“returns” the number of rows affected, which a
client program can obtain at the SQL level by calling the
ROW_COUNT() function and from C by calling
the mysql_affected_rows() C API function.
