/****************************************************************************
** (c) Copyright IBM Corp. 2007 All rights reserved.
**
** The following sample of source code ("Sample") is owned by International
** Business Machines Corporation or one of its subsidiaries ("IBM") and is
** copyrighted and licensed, not sold. You may use, copy, modify, and
** distribute the Sample in any form without payment to IBM, for the purpose of
** assisting you in the development of your applications.
**
** The Sample code is provided to you on an "AS IS" basis, without warranty of
** any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR
** IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do
** not allow for the exclusion or limitation of implied warranties, so the above
** limitations or exclusions may not apply to you. IBM shall not be liable for
** any damages you suffer as a result of using, copying, modifying or
** distributing the Sample, even if IBM has been advised of the possibility of
** such damages.
*****************************************************************************
**
** SOURCE FILE NAME: dtlob.sqC
**
** SAMPLE: How to use the LOB data type
**
** SQL STATEMENTS USED:
** SELECT
** INSERT
** DELETE
** DECLARE CURSOR
** OPEN
** FETCH
** CLOSE
** VALUES
** FREE LOCATOR
**
**
*****************************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing embedded SQL applications see the Developing Embedded SQL Applications book.
**
** For information on using SQL statements, see the SQL Reference.
**
** For the latest information on programming, compiling, and running DB2
** applications, visit the DB2 Information Center at
** http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
****************************************************************************/
#include <string.h>
#include <sqlenv.h>
#include <sqlutil.h>
#include <sql.h>
#include "utilemb.h"
#if ((__cplusplus >= 199711L) && !defined DB2HP && !defined DB2AIX) || \
(DB2LINUX && (__LP64__ || (__GNUC__ >= 3)) )
#include <iostream>
using namespace std;
#else
#include <iostream.h>
#endif
EXEC SQL BEGIN DECLARE SECTION;
SQL TYPE IS BLOB_FILE blobFilePhoto;
char photoFormat[10];
char empno[7];
SQL TYPE IS CLOB(5 K) clobResume;
SQL TYPE IS CLOB_FILE clobFileResume;
SQL TYPE IS CLOB_LOCATOR clobLocResume;
sqlint32 posBeginDeptInfo;
sqlint32 posBeginEducation;
SQL TYPE IS CLOB(5 K) clobDeptInfo;
SQL TYPE IS CLOB_LOCATOR clobLocShortResume;
SQL TYPE IS CLOB_LOCATOR clobLocNewResume;
short lobind;
EXEC SQL END DECLARE SECTION;
class DtLob
{
public:
int BlobFileUse();
int ClobUse();
int ClobFileUse();
int ClobLocatorUse();
};
int DtLob::BlobFileUse()
{
struct sqlca sqlca;
char fileName[15];
cout << "\n-----------------------------------------------------------";
cout << "\nUSE THE SQL STATEMENTS:" << endl;
cout << " SELECT INTO" << endl;
cout << " INSERT" << endl;
cout << " DELETE" << endl;
cout << "TO SHOW HOW TO USE A BLOB FILE." << endl;
#if (defined(DB2NT))
strcpy(photoFormat, "bitmap");
strcpy(fileName, "photo.BMP");
#else //UNIX
strcpy(photoFormat, "gif");
strcpy(fileName, "photo.GIF");
#endif
// initialize blobFile
strcpy(blobFilePhoto.name, fileName);
blobFilePhoto.name_length = strlen(blobFilePhoto.name);
// read BLOB data
cout << "\n Read BLOB data in the file '" << fileName << "'." << endl;
blobFilePhoto.file_options = SQL_FILE_OVERWRITE;
EXEC SQL SELECT picture INTO :blobFilePhoto :lobind
FROM emp_photo
WHERE photo_format = :photoFormat AND
empno = '000130';
EMB_SQL_CHECK("BLOB data -- read");
if (lobind < 0)
{
cout << " NULL LOB indicated." << endl;
return 1;
}
// write BLOB data
cout << " Write BLOB data from the file '" << fileName << "'." << endl;
blobFilePhoto.file_options = SQL_FILE_READ;
EXEC SQL INSERT INTO emp_photo(empno, photo_format, picture)
VALUES('200340', :photoFormat, :blobFilePhoto);
EMB_SQL_CHECK("BLOB data -- write");
// delete new record
cout << " Delete the new record from the database." << endl;
EXEC SQL DELETE FROM emp_photo WHERE empno = '200340';
EMB_SQL_CHECK("new record -- delete");
return 0;
} //DtLob::BlobFileUse
int DtLob::ClobUse()
{
struct sqlca sqlca;
int charNb;
int lineNb;
cout << "\n-----------------------------------------------------------";
cout << "\nUSE THE SQL STATEMENTS:" << endl;
cout << " DECLARE CURSOR" << endl;
cout << " OPEN" << endl;
cout << " FETCH" << endl;
cout << " CLOSE" << endl;
cout << "TO SHOW HOW TO USE THE CLOB DATA TYPE." << endl;
cout << "\n READ THE CLOB DATA:" << endl;
EXEC SQL DECLARE c1 CURSOR FOR
SELECT empno, resume
FROM emp_resume
WHERE resume_format = 'ascii' AND empno = '000130';
EXEC SQL OPEN c1;
EMB_SQL_CHECK("cursor -- open");
EXEC SQL FETCH c1 INTO :empno, :clobResume :lobind;
EMB_SQL_CHECK("cursor -- fetch");
while (sqlca.sqlcode != 100)
{
if (lobind < 0)
{
cout << " NULL LOB indicated." << endl;
}
else
{
cout << "\n Empno: " << empno << endl;
cout << " Resume length: " << clobResume.length << endl;
cout << " First 15 lines of the resume:" << endl;
for (charNb = 0, lineNb = 0;
lineNb < 15 && charNb < clobResume.length; charNb++)
{
cout << clobResume.data[charNb];
if (clobResume.data[charNb] == '\n')
{
cout << " ";
lineNb++;
}
}
}
EXEC SQL FETCH c1 INTO :empno, :clobResume:lobind;
EMB_SQL_CHECK("cursor -- fetch");
}
EXEC SQL CLOSE c1;
EMB_SQL_CHECK("cursor -- close");
return 0;
} //DtLob::ClobUse
int DtLob::ClobFileUse()
{
struct sqlca sqlca;
char fileName[15];
cout << "\n-----------------------------------------------------------";
cout << "\nUSE THE SQL STATEMENT:" << endl;
cout << " SELECT INTO" << endl;
cout << "TO SHOW HOW TO USE A CLOB FILE." << endl;
strcpy(fileName, "resume.TXT");
// initialize clobFile
strcpy(clobFileResume.name, fileName);
clobFileResume.name_length = strlen(clobFileResume.name);
// read CLOB data
cout << "\n Read CLOB data in the file '" << fileName << "'." << endl;
clobFileResume.file_options = SQL_FILE_OVERWRITE;
EXEC SQL SELECT resume INTO :clobFileResume:lobind
FROM emp_resume
WHERE resume_format = 'ascii' AND empno = '000130';
EMB_SQL_CHECK("CLOB data -- read");
if (lobind < 0)
{
cout << " NULL LOB indicated." << endl;
return 1;
}
return 0;
} //DtLob::ClobFileUse
int DtLob::ClobLocatorUse()
{
struct sqlca sqlca;
int charNb;
cout << "\n-----------------------------------------------------------";
cout << "\nUSE THE SQL STATEMENTS:" << endl;
cout << " SELECT INTO" << endl;
cout << " INSERT" << endl;
cout << " DELETE" << endl;
cout << " VALUES" << endl;
cout << " FREE LOCATOR" << endl;
cout << "TO SHOW HOW TO USE A CLOB LOCATOR." << endl;
cout << "\n **************************************************" << endl;
cout << " ORIGINAL RESUME -- VIEW" << endl;
cout << " **************************************************" << endl;
EXEC SQL SELECT resume INTO :clobResume
FROM emp_resume
WHERE empno = '000130' AND resume_format = 'ascii';
EMB_SQL_CHECK("old resume -- read");
for (charNb = 0; charNb < clobResume.length; charNb++)
{
cout << clobResume.data[charNb];
}
cout << "\n ********************************************" << endl;
cout << " NEW RESUME -- CREATE" << endl;
cout << " ********************************************" << endl;
EXEC SQL SELECT resume INTO :clobLocResume
FROM emp_resume
WHERE empno = '000130' AND resume_format = 'ascii';
EMB_SQL_CHECK("resume -- read");
EXEC SQL VALUES(POSSTR(:clobLocResume, 'Department Information'))
INTO :posBeginDeptInfo;
EMB_SQL_CHECK("Department Info position -- get");
EXEC SQL VALUES(POSSTR(:clobLocResume, 'Education'))
INTO :posBeginEducation;
EMB_SQL_CHECK("Education position -- get");
cout << "\n Create short resume without Department Info." << endl;
EXEC SQL VALUES(SUBSTR(:clobLocResume, 1, :posBeginDeptInfo - 1) ||
SUBSTR(:clobLocResume, :posBeginEducation))
INTO :clobLocShortResume;
EMB_SQL_CHECK("short resume -- create");
EXEC SQL VALUES(SUBSTR(:clobLocResume, :posBeginDeptInfo,
:posBeginEducation - :posBeginDeptInfo))
INTO :clobDeptInfo;
EMB_SQL_CHECK("Department Info -- create");
cout << " Append Department Info at the end of Short resume." << endl;
EXEC SQL VALUES(:clobLocShortResume || :clobDeptInfo)
INTO :clobLocNewResume;
EMB_SQL_CHECK("new resume -- create");
cout << " Insert the new resume in the database." << endl;
EXEC SQL INSERT INTO emp_resume(empno, resume_format, resume)
VALUES('200340', 'ascii', :clobLocNewResume);
EMB_SQL_CHECK("new resume -- write");
EXEC SQL FREE LOCATOR :clobLocResume,
:clobLocShortResume,
:clobLocNewResume;
EMB_SQL_CHECK("locators -- free");
cout << "\n *************************************" << endl;
cout << " NEW RESUME -- VIEW" << endl;
cout << " *************************************" << endl;
EXEC SQL SELECT resume INTO :clobResume
FROM emp_resume
WHERE empno = '200340';
EMB_SQL_CHECK("new resume -- read");
for (charNb = 0; charNb < clobResume.length; charNb++)
{
cout << clobResume.data[charNb];
}
cout << "\n **************************************" << endl;
cout << " NEW RESUME -- DELETE" << endl;
cout << " **************************************" << endl;
EXEC SQL DELETE FROM emp_resume WHERE empno = '200340';
EMB_SQL_CHECK("new resume -- delete");
return 0;
} //DtLob::LobLocatorUse
int main(int argc, char *argv[])
{
int rc = 0;
CmdLineArgs check;
DtLob lob;
DbEmb db;
// check the command line arguments
rc = check.CmdLineArgsCheck1(argc, argv, db);
if (rc != 0)
{
return rc;
}
cout << "\nTHIS SAMPLE SHOWS HOW TO USE THE LOB DATA TYPE." << endl;
// connect to the database
rc = db.Connect();
if (rc != 0)
{
return rc;
}
rc = lob.BlobFileUse();
rc = lob.ClobUse();
rc = lob.ClobFileUse();
rc = lob.ClobLocatorUse();
// disconnect from the database
rc = db.Disconnect();
if (rc != 0)
{
return rc;
}
return 0;
} //main