Host variables are data items used in SQL commands in both the
main program unit and in subprogram units. They are used to
pass the following information between an application program
and ALLBASE/SQL:
Messages from the ALLBASE/SQL message catalog.
All host variables used in either the main program unit or a
subprogram unit of a FORTRAN program must be declared in the
Host Variable Declaration Section of the program unit where the
host variable is used. The type descriptions of host variables
must be compatible with ALLBASE/SQL data types. The type
descriptions of host variables must also satisfy certain
preprocessor criteria.
This chapter first identifies how and where in a program unit
you can use host variables. Then it discusses how to write
variable declaration types that complement the way they are
used.
