Replace value in CLOB containing 2400-3000 bytes of Base64 encoded text

Hi,
I need to replace a part of a base64 encoded string stored in a CLOB.
Basically what I need to do is to:
- Get data from CLOB
- Base64 decode
- Replace a part of the string
- Base64 encode
- Put data back into CLOB
I have tried using the UTL_ENCODE.BASE64_ENCODE (and DECODE). These functions uses and supplies RAW-values, so to convert to RAW I did UTL_RAW.CAST_TO_RAW (and _VARCHAR2 to go back).
I've found that the RAW-type is limited to 2000 bytes (http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/03_types.htm#10764), but the messages I'm trying to modify is from about 2400 to about 3000 bytes.
Is there any way around this problem?
Thanks in advance,
Jan

The link you provided states, pl sql variable can be up to 32767 bytes , only database column can be up to 2000 bytes. For processing you describe, i suggest, you are interested only in plsql raw variables, not in the database columns ( which are clob's).
Best regards
Maxim

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for example (Assumption: the abbreviated month is the first occurance of 3 consecutive alphabetic charachters)
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PART
PART_DATE
RES
GL~1001~157747~FEB-13~CREDIT~A~N~USD~NULL~
FEB
02/01/2013
GL~1001~157747~JAN-13~CREDIT~A~N~USD~NULL~
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01/01/2013
GL~1001~157747~DEC-12~CREDIT~A~N~USD~NULL~
Message was edited by: chris227 year included

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=s=i=g=n=a=t=u=r=e= Click on the Star and see what happens :-) =s=i=g=n=a=t=u=r=e=

[svn] 1751: Bug: BLZ-174 - MessageClient.testMessage() is incorrectly doing a string compare for the subtopic header of an inbound message against the subtopic value (which may contain wildcards) that the Consumer is using.

Revision: 1751
Author: [email protected]
Date: 2008-05-15 14:21:43 -0700 (Thu, 15 May 2008)
Log Message:
Bug: BLZ-174 - MessageClient.testMessage() is incorrectly doing a string compare for the subtopic header of an inbound message against the subtopic value (which may contain wildcards) that the Consumer is using.
QA: No - customer verified the fix.
Doc: No
Ticket Links:
http://bugs.adobe.com/jira/browse/BLZ-174
Modified Paths:
blazeds/branches/3.0.x/modules/core/src/java/flex/messaging/MessageClient.java
blazeds/branches/3.0.x/modules/core/src/java/flex/messaging/services/MessageService.java

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You can use the UPDATE command to update one of the field value in a table
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I was reading jsr-220 and now I have a question.
What is the best practice to replace values in an entity?
For example I have an entity Person:
@Table(name = "Person", schema = SCHEMA)
public class Person{
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Imagine such situation:
I've persisted a Person. While system was in use, it's id points to some other entities. So I can't loose it.
Then, my special crawler gathered new info about person.
Using sourceUri of Person(crawler has provided it) I can select already persisted person from DB.
Now, my task is to completely remove some fields (this data must disappear from DB, totally, no orphaned links) from persisted person and replace them with values from new person gathered by crawler.
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2. Replace some fields of persitedPerson with new values taken from crawledPerson.
3. em.merge(persistedPerson)
OR
1. Find persitedPerson using sourceUri.
2. Set some fields of persitedPerson to NULL
3. Merge persitedPerson
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Seems like the first variant is enough. It will fork fine if annotations were set correctly (cascade={CascadeType.ALL} and other)
Edited by: Holod on 10.11.2008 16:32
Edited by: Holod on 10.11.2008 16:46

I was reading jsr-220 and now I have a question.
What is the best practice to replace values in an entity?
For example I have an entity Person:
@Table(name = "Person", schema = SCHEMA)
public class Person{
     @Id
     @GeneratedValue
     private int id;
     private String sourceUri;
       @ManyToMany(fetch=FetchType.EAGER, cascade={CascadeType.MERGE, CascadeType.REFRESH, CascadeType.PERSIST} )
     private List<Representative> representatives;
     @OrderBy("date")
     @ManyToMany(fetch=FetchType.EAGER, cascade={CascadeType.ALL}, mappedBy="person")
        private List<PersonAccessCounter> counter;
     @OneToMany(fetch=FetchType.EAGER, cascade={CascadeType.ALL}, mappedBy="person")
     private List<EducationLevel> educationLevels;
      //some other fileds + getters/setters
}As you can see, my Person has autoGenerated id. But also it has other "unformal" identity field: sourceUri
Imagine such situation:
I've persisted a Person. While system was in use, it's id points to some other entities. So I can't loose it.
Then, my special crawler gathered new info about person.
Using sourceUri of Person(crawler has provided it) I can select already persisted person from DB.
Now, my task is to completely remove some fields (this data must disappear from DB, totally, no orphaned links) from persisted person and replace them with values from new person gathered by crawler.
What's better?
1. Find persitedPerson using sourceUri
2. Replace some fields of persitedPerson with new values taken from crawledPerson.
3. em.merge(persistedPerson)
OR
1. Find persitedPerson using sourceUri.
2. Set some fields of persitedPerson to NULL
3. Merge persitedPerson
4. Set new values to persitedPerson taken from crawledPerson.
3. em.merge(persistedPerson)
Seems like the first variant is enough. It will fork fine if annotations were set correctly (cascade={CascadeType.ALL} and other)
Edited by: Holod on 10.11.2008 16:32
Edited by: Holod on 10.11.2008 16:46

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Hi,
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