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Datei:
P6.cob
Sprache: Unknown
***********************************************************************
** Licensed Materials - Property of IBM
**
** Governed under the terms of the International
** License Agreement for Non-Warranted Sample Code.
**
** (C) COPYRIGHT International Business Machines Corp. 1998 - 2002
** All Rights Reserved.
**
** US Government Users Restricted Rights - Use, duplication or
** disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
***********************************************************************
**
** SOURCE FILE NAME: lobeval.sqb
**
** SAMPLE: Demonstrates how to use a Large Object (LOB)
**
** This sample program demonstrates the use of LOB values.
** The program creates a CURSOR , and fetches the contents
** of the "emp_resume" table (the SAMPLE database must be
** installed with the "db2sampl" executable), and then
** outputs the first 15 lines of the resume.
**
** SQL STATEMENTS USED:
** BEGIN DECLARE SECTION
** END DECLARE SECTION
** FREE LOCATOR
** CONNECT
** SELECT
** DELETE
** VALUES
** INSERT
**
** OUTPUT FILE: lobeval.out (available in the online documentation)
***********************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing COBOL applications, see the
** Application Development Guide.
**
** For information on using SQL statements, see the SQL Reference.
**
** For the latest information on programming, compiling, and running
** DB2 applications, visit the DB2 application development website:
** http://www.software.ibm.com/data/db2/udb/ad
***********************************************************************
Identification Division.
Program-ID. "lobeval".
Data Division.
Working-Storage Section.
copy "sqlenv.cbl".
copy "sql.cbl".
copy "sqlca.cbl".
EXEC SQL BEGIN DECLARE SECTION END-EXEC.
01 userid pic x(8).
01 passwd.
49 passwd-length pic s9(4) comp-5 value 0.
49 passwd-name pic x(18).
01 hv-start-deptinfo pic s9(9) comp-5.
01 hv-start-educ pic s9(9) comp-5.
01 hv-return-code pic s9(9) comp-5.
01 hv-new-section-buffer USAGE IS SQL TYPE IS CLOB(5K).
01 hv-doc-locator1 USAGE IS SQL TYPE IS CLOB-LOCATOR.
01 hv-doc-locator2 USAGE IS SQL TYPE IS CLOB-LOCATOR.
01 hv-doc-locator3 USAGE IS SQL TYPE IS CLOB-LOCATOR.
EXEC SQL END DECLARE SECTION END-EXEC.
77 errloc pic x(80).
Procedure Division.
Main Section.
display "Sample COBOL program: LOBEVAL".
* Get database connection information.
display "Enter your user id (default none): "
with no advancing.
accept userid.
if userid = spaces
EXEC SQL CONNECT TO sample END-EXEC
else
display "Enter your password : " with no advancing
accept passwd-name.
* Passwords in a CONNECT statement must be entered in a VARCHAR
* format with the length of the input string.
inspect passwd-name tallying passwd-length for characters
before initial " ".
EXEC SQL CONNECT TO sample USER :userid USING :passwd
END-EXEC.
move "CONNECT TO" to errloc.
call "checkerr" using SQLCA errloc.
* Delete any instance of "A00130" from previous executions
EXEC SQL DELETE FROM emp_resume
WHERE empno = 'A00130' END-EXEC.
* use a single row select to get the document
EXEC SQL SELECT resume INTO :hv-doc-locator1
FROM emp_resume
WHERE empno = '000130'
AND resume_format = 'ascii' END-EXEC.
move "SELECT" to errloc.
call "checkerr" using SQLCA errloc.
* use the POSSTR function to locate the start of sections
* "Department Information" & "Education"
EXEC SQL VALUES (POSSTR(:hv-doc-locator1,
'Department Information'))
INTO :hv-start-deptinfo END-EXEC.
move "VALUES1" to errloc.
call "checkerr" using SQLCA errloc.
EXEC SQL VALUES (POSSTR(:hv-doc-locator1,
'Education')) INTO :hv-start-educ END-EXEC.
move "VALUES2" to errloc.
call "checkerr" using SQLCA errloc.
* replace Department Information section with nothing
EXEC SQL VALUES (SUBSTR(:hv-doc-locator1, 1,
:hv-start-deptinfo - 1) ||
SUBSTR(:hv-doc-locator1, :hv-start-educ))
INTO :hv-doc-locator2 END-EXEC.
move "VALUES3" to errloc.
call "checkerr" using SQLCA errloc.
* move Department Information section into hv-new-section-buffer
EXEC SQL VALUES (SUBSTR(:hv-doc-locator1,
:hv-start-deptinfo,
:hv-start-educ - :hv-start-deptinfo))
INTO :hv-new-section-buffer END-EXEC.
move "VALUES4" to errloc.
call "checkerr" using SQLCA errloc.
* Append the new section to the end (assume it has been filled)
* Effectively, this just moves the Dept Info to the bottom of
* the resume.
EXEC SQL VALUES (:hv-doc-locator2 ||
:hv-new-section-buffer)
INTO :hv-doc-locator3 END-EXEC.
move "VALUES5" to errloc.
call "checkerr" using SQLCA errloc.
* Store this resume in the table.
* This is where the LOB value bytes really move.
EXEC SQL INSERT INTO emp_resume
VALUES ('A00130', 'ascii', :hv-doc-locator3)
END-EXEC.
move "INSERT" to errloc.
call "checkerr" using SQLCA errloc.
display "LOBEVAL completed".
EXEC SQL FREE LOCATOR :hv-doc-locator1, :hv-doc-locator2,
:hv-doc-locator3 END-EXEC.
move "FREE LOCATOR" to errloc.
call "checkerr" using SQLCA errloc.
EXEC SQL CONNECT RESET END-EXEC.
move "CONNECT RESET" to errloc.
call "checkerr" using SQLCA errloc.
End-Prog.
stop run.
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