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handling CLOB from java

 
Ishita Saha
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Hi,

I need to write a simple program to fetch a column data which is clob (oracle 9.2)
and insert/modify it and save it back to database.

I tried to use java.sql.Clob which has a setString function but that gives me

**************************************
java.sql.SQLException: Unsupported feature
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
at oracle.jdbc.dbaccess.DBError.throwUnsupportedFeatureSqlException(DBError.java:689)
at oracle.sql.CLOB.setString(CLOB.java:1148)

Please help me with this, I need this working urgently.
I also came to know that I can get a clob as a String and save back a String as a clob but that is not working in oracle 9.2.
I think that only works with oracle 10g

Regards
 
Jhakda Velu
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I did something like this


If i remember correctly, we used 9x version of Oracle

Jhakda
 
Ishita Saha
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It gives me following error:

ORA-22920: row containing the LOB value is not locked
 
Jhakda Velu
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Can you post your code?
 
Jan Cumps
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A solution is discussed here: http://forums.oracle.com/forums/thread.jspa?messageID=2146346

This person solved the issue by using select for update.
 
Jhakda Velu
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If you see the snippet that i posted, it is also selecting the clob/blob initially and then updating it.
 
Ishita Saha
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I tried it other way and it worked:



I found it from my collegue
 
Jan Cumps
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Jhakda Velu wrote:If you see the snippet that i posted, it is also selecting the clob/blob initially and then updating it.
Jhakda, "select fort update" does not mean that you first select, and then update. It is an SQL clause that you use, in your select statement, to tell the database that you are going to change it.

Glad you found a solution.
 
Michael Aillon
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I think I found the answer to this.

1) Consult this link for background info http://download.oracle.com/docs/cd/B12037_01/java.101/b10979/jdbcversion.htm

It talks about how some features were available in JDBC 3.0 and some were not.

In general though my problem was solved by:
A) Putting (what I think was) a more update-to-date version of ojdbc14.jar in Tomcat under common/lib folder. ( (I pulled this from Weblogic 8.1 server/lib folder)
B) Put a library reference to the exact same jar in my eclipse build path.
C) Do a clean and recompile of the your class/project
4) Utilize the JDBC methods instead of the proprietary Oracle methods when performing a "select for update".

Writer w = null;
w = yourFetchedClob.setCharacterStream(1);
w.write(yourLargeString);
w.flush();
w.close();

I'm betting it was an old ojdbc14.jar that did not have Clob write feature implemented.


 
Consider Paul's rocket mass heater.
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