As shown at 10 in Figure 3-1, you use the SQLEXPLAIN command
to obtain a message from the ALLBASE/SQL message catalog that describes the
condition related to certain SQLCA values:
EXEC SQL SQLEXPLAIN :SQLMessage;
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ALLBASE/SQL puts a message from the ALLBASE/SQL message catalog into the
host variable named SQLMessage, and the program displays the
message.
Sometimes more than one message may be needed to completely
describe how an SQL command executed. To retrieve all
messages, the program in Figure 3-1
executes SQLEXPLAIN
until SQLCODE is equal to zero.
ALLBASE/SQL sets SQLCODE to zero when no more messages are available.
You can use SQLEXPLAIN in conjunction with either implicit or
explicit status checking. Procedure SQLStatusCheck is also
executed from the routine labelled 1000, which is
used in conjunction with the first WHENEVER command in the
program.
The default message catalog is /usr/lib/nls/n-computer/hpsqlcat.
An alternate name for the same catalog is /usr/lib/hpsqlcat. For native
language users, the catalog is /usr/lib/nls/$LANG/hpsqlcat, where $LANG
is the current language.
If this catalog is not available, ALLBASE/SQL
issues a warning and uses the default catalog instead.
