Creating/constructing a java.sql.Blob and writing to Oracle with jdbc

I'm trying to understand how to create a blob from an image file to write it to a Oracle database using jdbc.
I know there'a a getBinaryStream method in java.sql.Blob to which I can write the files byte array, but how do I create an actual blob in the first place. All examples I've seen initialise the blob from an exiting Blob field in a database which I do not have filled yet
thanks

In general, you will do something like the following:
Ensure setAutoCommit is false
INSERT INTO foo (blob_column) values (empty_blob());
SELECT blob_column FROM foo FOR UPDATE;
Call getBlob() on the ResultSet
Cast it to Oracle's specific BLOB (different object)
Call getBinaryOutputStream() on the BLOB
Pipe your data
Commit (very importatnt as FOR UPDATE will lock that row)- Saish

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Get canvas.toDataURL('image/jpeg') and convert base64 encoding to java.sql.Blob

Convert canvas.toDataURL('image/jpeg') to java.sql.Blob.
I am using oracle adf so I am able to action a backing bean from javascript and pass in parameters as a map. I pass in the canvas.toDataURL('image/jpeg') which I then try to decode in my bean. Using BASE64Decoder and the converting the bytearray to a file I can see the image is corrupted as I can't open the file thus converting the bytearray to blob is also a waste.
Has anyone any ideas on base64 encoding from canvas.toDataURL to file or Blob?

Use Case:
A jsf page that enables a user to take photos using the HTML5 canvas feature - interact with webcam -, take photos and upload to profile
1. I have created the jsf page with the javascript below; this pops up as a dialog and works okay and onclick an upload image, triggers the snapImage javascript function below and sends the imgURL parameter to the serverside managedbean

function snapImage(event){
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public void getCamImage(ClientEvent ce){
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decodeBase64URLToBlob(url);
private BlobDomain decodeBaseB4URLToBlob(String url64){
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----problem---
Accessing the generated jpeg file shows the image is corrupted, probably missing bytes or encode/decoder issues.and the blob image after uploading to database is saved as a binary stream which ondownload doesnt render as an image or anything i know of.
Is there anyways of achieving the conversion without errors?

Datasource, POJO and java.sql.Blob

Hello,
is "java.sql.Blob" a valid type for a POJO datasource ?
I declared one but I just dit not succeed in rendering its jpg picture.
My java code is quite simple :
ReportClientDocument reportClientDocument = new ReportClientDocument ();
reportClientDocument.setReportAppServer(ReportClientDocument.inprocConnectionString);
reportClientDocument.open (REPORT_NAME, OpenReportOptions._openAsReadOnly);
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reportClientDocument.getDatabaseController().setDataSource(resultSet, "", "");
and my POJO class :
public class LPOJOData {
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Any clues ?
Regards,
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I have just found a list of the data types supported by a POJO Class :
# boolean
# byte
# char
# double
# float
# int
# short
# java.lang.Boolean
# java.lang.Byte
# java.lang.Double
# java.lang.Float
# java.lang.Integer
# java.lang.Short
# java.lang.String
# java.SQL.Date
# java.SQL.Time
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Is there another way than POJO to feed a report from an in-memory datasource ?

Java.sql.Blob method setBinaryStream?

Hi,
I've been trying to use the java.sql.Blob methods instead of the "Oracle Extensions" so that people w/o Oracle (using MySQL etc.) can still use my code.
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Sample code:
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//End code
Am I doing something wrong? Or is there simply no way to write to a Blob without using the extensions?
None of the docs (examples, guides, etc) make any mention of this, although the JDBC dev guide does mention that the similar method in PreparedStmt only works over OCI.
Thanks,
Dan

Hi lancea,
It's been a while since this thread was active, but I have a related question.
Is there a comprehensive list of changes between JDBC 3 and JDBC 4 that makes application not work any more, such as this setBinaryStream issue or the CallableStatement/Named parameters issue that we stumbled upon. We would like to address these issues proactively and not find out about them in production, since we're upgrading from jdk1.4 to jdk6. Oracle has provided us with their changes regarding database versions, but have been less forthcoming with JDBC spec version changes.
Thanks in advance,
Thomas Auzinger

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Hi All,
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Thanks in advance,
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u can create blob as below...
java.sql.Blob blob=new Blob();
File file=new File(fullPathTo UrFile);
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ByteArrayOutputStream bOutputStream = new ByteArrayOutputStream();
int nextByte;
while (( nextByte = bInputStream.read() ) != - 1)
bOutputStream.write(nextByte);
byte[] byteContent = bOutputStream.toByteArray();
blob.setBytes(byte[]);
i think it should work for u...

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Silvia Hofmann

http://www.excelsior-usa.com/jet.html
http://www.ej-technologies.com/products/exe4j/overview.html
http://jsmooth.sourceforge.net/
Distributing your Application as an executable JAR file
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Hi,
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thanks,
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PS: Please award points if you find the answer useful

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Java.sql.SQLException:listener refused the connection with the error

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Hi,
We have a table by name clarity_response_log and content of the column(Response_file) is BLOB and we have xml file or xml content in that column. Most probably the column or table may be having more than 5 records and hence we need to read the corresponding blob content and write to an external file.
CREATE TABLE CLARITY_RESPONSE_LOG
REQUEST_CODE   NUMBER,
RESPONSE_FILE BLOB,
DATE_CRATED    DATE                           NOT NULL,
CREATED_BY     NUMBER                         NOT NULL,
UPDATED_BY     NUMBER                         DEFAULT 1,
DATE_UPDATED   VARCHAR2(20 BYTE)              DEFAULT SYSDATE
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Insert into CLARITY_RESPONSE_LOG
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Values
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Values
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Values
   (9, '<?xml version="1.0" encoding="UTF-8"?><xml-response><phone-number>1212121212</tracking-number></xml-response>', TO_DATE('09/23/2010 09:01:34', 'MM/DD/YYYY HH24:MI:SS'), 1, 1, '23-SEP-10');THe corresponding proc for reading the data and writing the data to an external file goes something like this
SET serveroutput ON
DECLARE
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   bytelen    NUMBER             := 32000;
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   my_vr      RAW (32000);
   x          NUMBER;
   l_output   UTL_FILE.FILE_TYPE;
BEGIN
-- define output directory
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---get the Blob locator
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-------- write in pieces
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---------------- set the start position for the next cut
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---------- set the end position if less than 32000 bytes
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         END LOOP;
----------------- --- UTL_FILE.NEW_LINE(l_output);
      END IF;
   END LOOP;
   UTL_FILE.FCLOSE (l_output);
END;The above code works well and all the records or xml contents are being written simultaneously adjacent to each other but we each records must be written to a new line or there must be a line gap or a blank line between any two records
the code which I get is as follow all all xml data comes on a single line
<?xml version="1.0" encoding="ISO-8859-1"?><emp><empno>7369</empno><ename>James</ename><job>Manager</job><salary>1000</salary></emp><?xml version="1.0" encoding="ISO-8859-1"?><emp><empno>7370</empno><ename>charles</ename><job>President</job><salary>500</salary></emp>But the code written to an external file has to be something like this.
<?xml version="1.0" encoding="ISO-8859-1"?>
<emp>
<empno>7369</empno>
<ename>James</ename>
<job>Manager</job>
<salary>1000</salary>
</emp>
<?xml version="1.0" encoding="ISO-8859-1"?>
<emp>
<empno>7370</empno>
<ename>charles</ename>
<job>President</job>
<salary>500</salary>
</emp>Please advice

What was wrong with the previous answers given on your other thread:
Export Blob data to text file(-29285-ORA-29285: file write error)
If there's a continuing issue, stay with the same thread, don't just ask the same question again and again, it's really Pi**es people off and causes confusion as not everyone will be familiar with what answers you've already had. You're just wasting people's time by doing that.
As already mentioned before, convert your BLOB to a CLOB and then to XMLTYPE where it can be treated as XML and written out to file in a variety of ways including the way I showed you on the other thread.
You really seem to be struggling to get the worst possible way to work.

Creating/constructing a java.sql.Blob and writing to Oracle with jdbc

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