The SQLCA is an ALLBASE/SQL data structure
that contains current information
about a program's DBE session.
Every ALLBASE/SQL COBOL program must contain an SQLCA declaration.
When a program or subprogram starts a DBE session, the SQLCA declaration
must be in its WORKING-STORAGE SECTION. If a subprogram called by
such a program contains SQL commands to be executed in the same
DBE session, the SQLCA declaration must also appear in the LINKAGE
SECTION of the subprogram.
As shown in Title not available at 1 , you can declare the SQLCA
by using the INCLUDE command:
EXEC SQL INCLUDE SQLCA END-EXEC.
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When the preprocessor encounters this command, it
generates a complete COBOL declaration
for this area. Six of
the fields in the SQLCA record are available for programmers to use:
SQLCODE
SQLERRD(3)
SQLWARN1
SQLWARN2
SQLWARN0
SQLWARN6
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Some values ALLBASE/SQL places into these fields indicate warning and error
conditions that resulted when the immediately preceding SQL
command was executed. Other values
simply provide information attendant
to normal command execution but are programmatically useful. For
example, when you submit an UPDATE command, the number of rows
updated is placed in SQLERRD(3). If this value is greater than one,
the program may want to advise the user of that condition and
process a ROLLBACK WORK or COMMIT WORK command based on the user's
response.
Examples discussed later in this chapter under "Implicit Status
Checking" and "Explicit
Status Checking" illustrate how the program in Title not available uses some
of the SQLCA fields to determine the success or failure of SQL
command execution.
