CLOB Data Read

Question

Hi,
We have a table in our oracle database having CLOB datatype as column.This column gets populated from Java application wherein the application reads an excel file from front end into CLOB column.
My requirement is to read this CLOB column from database and insert data into some file(CSV Format). say if excel was read into CLOB with 3 column and 10 rows, then I should also be able to read this column and insert into some file(CSV Format) that has same structure as of excel file.
For this i call the JavaConcurrentProgram.
Can anyone tell me what will i do for this? Any help would be appreciated.
Thanks in advance

Answer 1

Hi chandra,
Thanks for ur reply.
I create the EO and VO for file uploading.
I want to upload the file into data base when i clicked on the submit button.So i write the row creation code in PFR.
Actually my requirement is: whenever we upload the file into database(CLOB cloumn) by using the javaconcurrentprogram we convert the clob data content is stroed in .dat file certain path.
for this i write the code like this:
Actuall class+:*
public void processFormRequest(OAPageContext pageContext, OAWebBean webBean)
super.processFormRequest(pageContext, webBean);
OAApplicationModule am = pageContext.getApplicationModule(webBean);
if (pageContext.getParameter("go") != null)
{ processFileUpload(pageContext, webBean, am);
protected void processFileUpload(OAPageContext pageContext, OAWebBean webBean, OAApplicationModule am)
// Get hold of the binary fle contents
DataObject fleUploadData = (DataObject)pageContext.getNamedDataObject("fileupload");
if (fleUploadData == null) return;
String fleName = (String)fleUploadData.selectValue(null,"UPLOAD_FILE_NAME");
if (fleName == null) return;
String contentType =(String)fleUploadData.selectValue(null,"UPLOAD_FILE_MIME_TYPE");
BlobDomain uploadedByteStream = (BlobDomain)fleUploadData.selectValue(null,fleName);
if (uploadedByteStream == null) return;
// convert binary fle contents into an ASCII stream
System.out.println("after calling if block");
try {
String inputStream = streamToString(contentType, uploadedByteStream.getInputStream() );
String purposeCode = null;
System.out.println("after calling if block");
System.out.println("store the values in table");
// Store ASCII in the fle in the database
primaryKey = storeStream(inputStream , purposeCode, am);
System.out.println("after calling if block");
System.out.println("the orgid value iss "+(am.getOADBTransaction()).getOrgId());
int orgId = ((OADBTransactionImpl)am.getOADBTransaction()).getOrgId();
// submit the printing request
submitConcurrentProgram(primaryKey, purposeCode, orgId, am.getOADBTransaction().getJdbcConnection());
} catch (IOException ex) {
throw OAException.wrapperException(ex);
} catch (SQLException ex) {
throw OAException.wrapperException(ex);
} catch (RequestSubmissionException ex) {
throw OAException.wrapperException(ex);
protected String streamToString(String mimeType, InputStream inputStream) throws IOException
String result;
System.out.println("mime type is "+mimeType);
// check if this is an Excel spreadsheet
if ("application/vnd.ms-excel".equalsIgnoreCase(mimeType))
try {
result = xlsToString(inputStream);
} catch (jxl.read.biff.BiffException ex)
{ // if not, then assume this is an ASCII stream
System.out.println("catch blockk");
inputStream.reset();
result = inputStream.toString();//streamToString(mimeType,inputStream); ////streamToString("ASCII",inputStream);
} else
{ // otherwise an ASCII stream
result =inputStream.toString();//streamToString(mimeType,inputStream); ////streamToString("ASCII",inputStream);
return result;
private final static String CSV_SEPARATOR = ",";
private String xlsToString(InputStream stream)
throws jxl.read.biff.BiffException
StringWriter stringWriter = new StringWriter();
BufferedWriter bufferedWriter = new BufferedWriter(stringWriter);
try {
WorkbookSettings ws = new WorkbookSettings();
ws.setLocale(new Locale("en", "EN"));
Workbook w = Workbook.getWorkbook(stream, ws);
// Gets the sheets from workbook
for (int sheet = 0; sheet < w.getNumberOfSheets(); sheet++)
Sheet s = w.getSheet(sheet);
Cell[] row = null;
// Gets the cells from sheet
for (int i = 0 ; i < s.getRows() ; i++)
row = s.getRow(i);
if (row.length > 0)
bufferedWriter.write(formatExcelCell(row[0]));
for (int j = 1; j < row.length; j++)
bufferedWriter.write(CSV_SEPARATOR);
bufferedWriter.write(formatExcelCell(row[j]));
bufferedWriter.newLine();
bufferedWriter.flush();
catch(jxl.read.biff.BiffException ex)
throw ex;
catch (Exception ex)
throw OAException.wrapperException(ex);
return stringWriter.toString();
private final static String QUOTE_STRING ="\"";
private String formatExcelCell(Cell cell)
SimpleDateFormat dateFormatter = new SimpleDateFormat("d-MMM-yyyy");
if (cell == null) return null;
String rowCell = cell.getContents();
// format the date
if ( cell.getType().equals(cell.getType().DATE) )
rowCell = dateFormatter.format(((DateCell)cell).getDate());
// double each quote
String result = rowCell.replaceAll(QUOTE_STRING, QUOTE_STRING+QUOTE_STRING);
// surround with quotes if comma or quote is present
if (result.indexOf(CSV_SEPARATOR) >0 || result.indexOf(QUOTE_STRING) >0)
result = QUOTE_STRING + result + QUOTE_STRING;
return result;
protected Number generatePrimaryKey(OAApplicationModule am)
OAViewObject viewObject = (OAViewObject)am.findViewObject("FileUploadKeyVO1");
viewObject.setMaxFetchSize(1);
viewObject.executeQuery();
return (Number) (viewObject.first().getAttribute("Id"));
*public Number storeStream*(String inputStream, String purposeCode,OAApplicationModule am)
OAViewObject viewObject = (OAViewObject)am.findViewObject("xxcrmFileUploadVO1");
viewObject.setMaxFetchSize(0);
ClobDomain myClob = new ClobDomain();
myClob.setChars(inputStream.toCharArray());
OARow row = (OARow)viewObject.createRow();
row.setAttribute("FileContents",myClob);
primaryKey = generatePrimaryKey(am);
row.setAttribute("PurposeCode", purposeCode);
row.setAttribute("FileId", primaryKey);
viewObject.insertRow(row);
am.getTransaction().commit();
return primaryKey;
public void runProgram(CpContext cpcontext) {
try {
// read parameters
// execute business logic
cpcontext.getReqCompletion().setCompletion(ReqCompletion.NORMAL, "Request Completed Normal");
} catch (Exception ex) {
// report exception
cpcontext.getReqCompletion().setCompletion(ReqCompletion.ERROR, "Error building output fle");
} finally {
cpcontext.releaseJDBCConnection();
static public Map convertParameters(ParameterList parameterList)
{ Map result = new HashMap();
while( parameterList.hasMoreElements() ) {
NameValueType nameValueType = parameterList.nextParameter();
if (nameValueType.getValue() != null)
result.put(nameValueType.getName(), nameValueType.getValue());
return result;
protected void submitConcurrentProgram(Number primaryKey, String purposeCode, int orgId,
Connection connection) throws IOException, SQLException, RequestSubmissionException
System.out.println("before getting the output");
System.out.println("after getting the output");
ConcurrentRequest request = new ConcurrentRequest(connection);
Vector param = new Vector();
param.add(primaryKey.stringValue());
param.add(purposeCode);
param.add(String.valueOf(orgId));
int reqId = request.submitRequest("XXNC", "XXNC_FILEWRITE_JAVA", "Print CLOB",null, false, param);
connection.commit();
MessageToken[] tokens = { new MessageToken("REQUEST", String.valueOf(reqId)) };
OAException confrmMessage = new OAException("XXNC",
"XXNC_TEST_MSG",
tokens,
OAException.CONFIRMATION,
null);
throw confrmMessage;
_+*JavaconcurrentProgram class:*+_
/* for getting the clob data content stored into certain path*/
public String getOutput(Connection connection,
BigDecimal primaryKey) throws SQLException,
IOException
String statement =
"select file_contents from xxcrm_file_upload where file_id = :1";
String result;
PreparedStatement stmt = null;
ResultSet resultSet = null;
try
stmt = connection.prepareStatement(statement);
stmt.setBigDecimal(1, primaryKey);
resultSet = stmt.executeQuery();
resultSet.next();
result = //streamToString("application/vnd.ms-excel",resultSet.getAsciiStream(1));
resultSet.getAsciiStream(1).toString(); //streamToString("ASCII",resultSet.getAsciiStream(1) );
File data = new File("/u01/VIS/apps/apps_st/appl/xxnc/12.0.0/bin/TestClob.dat");
Reader reader = resultSet.getCharacterStream(1);
FileWriter writer = new FileWriter(data);
char[] buffer = new char[1];
while (reader.read(buffer) > 0) {
writer.write(buffer);
writer.close();
resultSet.close();
resultSet = null;
stmt.close();
stmt = null;
} finally
if (resultSet != null)
try
resultSet.close();
} catch (SQLException ex)
if (stmt != null)
try
stmt.close();
} catch (SQLException ex)
try
connection.commit();
} catch (SQLException ex)
return result;
public void runProgram(CpContext cpcontext)
Number primarykey = 0;
String s = cpcontext.getProfileStore().getProfile("APPS_FRAMEWORK_AGENT");
if (!s.endsWith("/"))
s = (new StringBuilder()).append(s).append("/").toString();
s = (new StringBuilder()).append(s).append("OA_MEDIA").toString();
Connection con = cpcontext.getJDBCConnection();
ReqCompletion lRC = cpcontext.getReqCompletion();
try
// Connection con = DriverManager.getConnection("jdbc:oracle:thin:@erpdb.nalsoft.net:1521:VIS","apps","visdb_234");
PreparedStatement st =
con.prepareStatement("select file_id from xxcrm_file_upload order by file_id desc");
ResultSet rs = st.executeQuery();
OutFile lOF = cpcontext.getOutFile();
LogFile lLF = cpcontext.getLogFile();
if (rs.next())
primarykey = rs.getBigDecimal(1);
BigDecimal primarybig = new BigDecimal(primarykey.toString());
s = getOutput(con, primarybig);
lOF.write(s);
lRC.setCompletion(ReqCompletion.NORMAL, "Request Completed Normal");
} catch (Exception e)
{ //Catch exception if any
System.err.println("Error: " + e.getMessage());
lRC.setCompletion(ReqCompletion.ERROR, e.toString());
} finally
cpcontext.releaseJDBCConnection();
Please give me the suggestion.