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From Virag Kothari <vi...@yahoo-inc.com>
Subject Re: Clob to Blob
Date Tue, 17 Sep 2013 19:36:09 GMT
Hi All,

Thank you all for replies.
I tried casting in Java by converting clob.getCharacterStream to a binary
stream using UTF-8 and it worked.


On 9/17/13 7:58 AM, "Rick Hillegas" <rick.hillegas@oracle.com> wrote:

>On 9/17/13 7:36 AM, Okken,Brett wrote:
>> Wouldn't the desired character encoding be a required input when
>>translating from a CLOB to a BLOB?
>Hi Brett,
>That sounds right. The clobToBlob() routine could take a character
>encoding argument or default to some character encoding which makes
>sense to the application. The routine might be able to use
>Clob.getAsciiStream() in order to unpack the CLOB as a byte stream.
>> Brett Okken
>> -----Original Message-----
>> From: Rick Hillegas [mailto:rick.hillegas@oracle.com]
>> Sent: Tuesday, September 17, 2013 7:40 AM
>> To: derby-user@db.apache.org
>> Subject: Re: FW: Clob to Blob
>> On 9/16/13 2:23 PM, Virag Kothari wrote:
>>> Anyone, Is there a way?
>>> From: Virag Kothari<virag@yahoo-inc.com<mailto:virag@yahoo-inc.com>>
>>> Date: Friday, September 13, 2013 3:53 PM
>>> To: "derby-user@db.apache.org<mailto:derby-user@db.apache.org>"
>>> <derby-user@db.apache.org<mailto:derby-user@db.apache.org>>
>>> Subject: Clob to Blob
>>> Hi,
>>> Is there a way to cast from clob to blob in derby?
>>>  From the table at
>>> http://db.apache.org/derby/docs/10.2/ref/rrefsqlj33562.html, there
>>> isn't seem a direct or indirect way to do so.
>>> Thanks,
>>> Virag
>> Hi Virag,
>> As Knut noted, Derby does not support casts from character to binary
>>types. Here Derby follows the casting rules laid out in the SQL
>>Standard, part 2, section 6.13 (<cast specification>). However, as Knut
>>also noted, you can write your own coercion function, say clobToBlob.
>> Then you can write queries like this:
>> insert into blobTable( blobColumn )
>>     select clobToBlob( clobColumn ) from clobTable;
>> For more information on user-written functions, please see the
>>following topic in the Derby Reference Guide:
>> You may find the following class useful, too. You can clone (and
>> improve) this class to write your own BLOB implementation as necessary:
>> org.apache.derby.iapi.types.HarmonySerialBlob
>> Hope this helps,
>> -Rick
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