*********************************************************************** ** 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. 1995 - 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: joinsql.sqb ** ** SAMPLE: An example using advanced SQL join expressions ** ** The advanced SQL statement to be executed and displayed is: ** ** WITH ** DEPT_MGR AS ** ( SELECT DEPTNO, DEPTNAME, EMPNO, LASTNAME, FIRSTNME, ** PHONENO FROM DEPARTMENT D, EMPLOYEE E ** WHERE D.MGRNO=E.EMPNO AND E.JOB='MANAGER' ** ), ** DEPT_NO_MGR AS ** ( SELECT DEPTNO, DEPTNAME, MGRNO AS EMPNO ** FROM DEPARTMENT ** EXCEPT ALL ** SELECT DEPTNO, DEPTNAME, EMPNO ** FROM DEPT_MGR ** ), ** MGR_NO_DEPT (DEPTNO, EMPNO, LASTNAME, FIRSTNME, PHONENO) AS ** ( SELECT WORKDEPT, EMPNO, LASTNAME, FIRSTNME, PHONENO ** FROM EMPLOYEE ** WHERE JOB='MANAGER' ** EXCEPT ALL ** SELECT DEPTNO,EMPNO, LASTNAME, FIRSTNME, PHONENO ** FROM DEPT_MGR ** ) ** SELECT DEPTNO, DEPTNAME, EMPNO, LASTNAME, FIRSTNME, PHONENO ** FROM DEPT_MGR ** UNION ALL ** SELECT DEPTNO, DEPTNAME, EMPNO, ** CAST(NULL AS VARCHAR(15)) AS LASTNAME, ** CAST(NULL AS VARCHAR(12)) AS FIRSTNME, ** CAST(NULL AS CHAR(4)) AS PHONENO ** FROM DEPT_NO_MGR ** UNION ALL ** SELECT DEPTNO, ** CAST(NULL AS VARCHAR(29)) AS DEPTNAME, ** EMPNO, LASTNAME, FIRSTNME, PHONENO ** FROM MGR_NO_DEPT; ** ** SQL STATEMENTS USED: ** BEGIN DECLARE SECTION ** END DECLARE SECTION ** CONNECT ** DECLARE ** FETCH ** OPEN ** ** OUTPUT FILE: joinsql.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 ***********************************************************************
ProcedureDivision.
Main Section. display"Sample COBOL program: JOINSQL".
* Get database connection information. display"Enter your user id (default none): " withnoadvancing. accept userid.
if userid = spaces EXECSQL CONNECT TO sample END-EXEC else display"Enter your password : "withnoadvancing 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 beforeinitial" ".
display" ".
EXECSQL CONNECT TO sample USER :userid USING :passwd END-EXEC. move"CONNECT TO"to errloc. call"checkerr"using SQLCA errloc.
* declare the cursor for the advanced SQL statement. EXECSQL DECLARE c1 CURSOR FOR WITH
DEPT_MGR AS
(SELECT DEPTNO, DEPTNAME, EMPNO, LASTNAME, FIRSTNME,
PHONENO FROM DEPARTMENT D, EMPLOYEE E
WHERE D.MGRNO=E.EMPNO AND E.JOB='MANAGER'),
DEPT_NO_MGR AS
(SELECT DEPTNO, DEPTNAME, MGRNO AS EMPNO FROM DEPARTMENT EXCEPT ALL SELECT DEPTNO, DEPTNAME, EMPNO FROM DEPT_MGR),
MGR_NO_DEPT (DEPTNO, EMPNO, LASTNAME, FIRSTNME,
PHONENO) AS
(SELECT WORKDEPT, EMPNO, LASTNAME, FIRSTNME,
PHONENO FROM EMPLOYEE
WHERE JOB='MANAGER' EXCEPT ALL SELECT DEPTNO,EMPNO, LASTNAME, FIRSTNME, PHONENO FROM DEPT_MGR) SELECT DEPTNO, DEPTNAME, EMPNO, LASTNAME, FIRSTNME,
PHONENO FROM DEPT_MGR
UNION ALL SELECT DEPTNO, DEPTNAME, EMPNO,
CAST(NULL AS VARCHAR(15)) AS LASTNAME,
CAST(NULL AS VARCHAR(12)) AS FIRSTNME,
CAST(NULL AS CHAR(4)) AS PHONENO FROM DEPT_NO_MGR END-EXEC.
if SQLCODE notequal 0 display" " goto End-Fetch-Loop. if l-ind notequal 0 move" "to lastname-name move 1 to lastname-len. if f-ind notequal 0 move" "to firstname-name move 1 to firstname-len. display deptno, " ", deptname, " ", empno, " ",
lastname-name(1:lastname-len), " ",
firstname-name(1:firstname-len), " ", phoneno.
add 1 to counter.
End-Fetch-Loop. exit.
End-Prog. stoprun.
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Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung ist noch experimentell.