HP 3000 Manuals

ALLBASE/SQL C Application Programming Guide

Chapter 3  Host Variables 

Host variables are variables used to pass the following information
between an application program and ALLBASE/SQL:

   *   Data values.

   *   Null value indicators.

   *   String truncation indicators.

   *   Bulk processing rows to process.

   *   Dynamic commands.

   *   Savepoint numbers.

   *   Messages from the ALLBASE/SQL message catalog.

   *   DBEnvironment names.

All host variables used in a C program must be declared in declaration
parts of the program.  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 identifies where in a C program you can use host variables
and then discusses how to write type descriptions that complement the way
host variables are used.  See the chapter, "Simple Data Manipulation",
for a sample program that uses host variables.

MPE/iX 5.0 Documentation