This week's book giveaway is in the Agile and Other Processes forum.
We're giving away four copies of The Journey To Enterprise Agility and have Daryl Kulak & Hong Li on-line!
See this thread for details.
Win a copy of The Journey To Enterprise Agility this week in the Agile and Other Processes forum! And see the welcome thread for 20% off.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Jeanne Boyarsky
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
Sheriffs:
  • Paul Clapham
  • Junilu Lacar
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Ganesh Patekar
  • Tim Moores
  • Pete Letkeman
  • Stephan van Hulst
Bartenders:
  • Carey Brown
  • Tim Holloway
  • Joe Ess

Convert large string to Clob  RSS feed

 
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,
My environment is as following:
Oracle 9.0.1
JDBC 2.0
Oracle thin driver
Sun Solaris sparc, OS 9
JDK 1.2
The question is I can not update a Clob before saving it. The input from our web application users sometime can be large, from 100k bytes to MBs. I want to save user's input into CLOB datatype in our Oracle database. Since, I am using JDK1.2, I do not have access to oracle.sql.clob. Do you know how to convert a string to a Clob in Java program and how to prepare a statement before executing a query. I used preparedStatement.setAsciiStream(int index, InputStream x, int length) to prepare my statement, and it doesn't work. I got an error thrown saying Io exception: End of TNS data channel.
Thank you very much for your help.
 
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
To create a Clob, use this instruction :
CLOB newClob = CLOB.createTemporary(conn, false, CLOB.DURATION_CALL);
newClob.putString(1,value);
.... but don't work with Websphere Datasource
Another solution : insert a 'empty_clob()' in table, then select and update the clob :
Insert: "insert into mytable(primarykey, clob_col) values (?, empty_clob())";
Then select and lock this row : " select clob_col from mytable where primarykey = ? for update"
Get the cob : oracle.sql.CLOB clob=(CLOB)rs.getClob("clob_col")
And update the clob content : fillClob(clob,"xxxx xknsd")
With the fillClob method :
// Utility function to put data in a Clob
static void fillClob(CLOB clob, String value) throws Exception {
clob.trim(0);
Writer outstream = clob.getCharacterOutputStream();
outstream.write(value, 0, value.length());
outstream.close();
}
 
A Tavouille
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This method work nice
/**
* Creer un Clob contenant la valeur pass� en param�tre. Fonctionne uniquement avec Oracle.<br>
* <b><i>Important </i>: Penser � fermer le clob une fois utilis� (ie apres maj ou insert en base)</b>
* <i>Note </i>: Sur Oracle 10g, on peut utiliser la property SetBigStringTryClob=true<br> et utiliser directement ps.setString(i,value)<br>
* dans le Dao<br>
*
* @param conn
* @param value
* @return Clob
* @TODO gerer de facon non proprietaire 'Oracle' des que possible.
*/
protected static Clob createClob(Connection conn,String value) throws SQLException{
CallableStatement stmt = null;
try{
//Creation d'un Clob temporaire
stmt = conn.prepareCall("{ call DBMS_LOB.CREATETEMPORARY(?, TRUE)}");
stmt.registerOutParameter(1, oracle.jdbc.OracleTypes.CLOB);
stmt.execute();
CLOB newClob = (CLOB)stmt.getObject(1);
newClob.putString(1,value);

return newClob;
}finally{
freeSql(stmt);
}
}
 
Author and ninkuma
Marshal
Posts: 66783
168
IntelliJ IDE Java jQuery Mac Mac OS X
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
"alexis alexis",
We're pleased to have you here with us in the JDBC forum, but there are a few rules that need to be followed, and one is that proper names are required. Please take a look at the JavaRanch Naming Policy and adjust your display name to match it.
In particular, your display name must be a first and a last name separated by a space character, and must not be obviously fictitious.
Thanks!
bear
Forum Bartender
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!