Creating a CLOB in jdbc

Question

I have a PL/SQL stored procedure which accepts a CLOB data type as one of the arguments. This procedure inserts a record into a table which has a column of datatype CLOB.
Using jdbc, my java program creates a CallableStatement to the stored proc. Now I wish to create the CLOB based on a String value and pass it to the stored proc.
This is a snippet of my code.
import java.io.*;
import java.sql.*;
import oracle.jdbc.driver.*;
import oracle.sql.*;
public class TestClob2 {
public static Connection getConnection() throws FPError {
Connection connection = null;
String hostname= "ahost";
String host = "jdbc:oracle:thin:@" + hostname+ ":1521:db";
String user = "user";
try {
DriverManager.registerDriver( new oracle.jdbc.driver.OracleDriver());
connection = DriverManager.getConnection(host, user, user);
} catch ( Exception e ){
System.out.println("could not get connection" + e.toString());
} catch ( Throwable t ){
System.out.println("could not get connection" + t.toString());
} finally {
return connection;
public static void main( String[] args){
Connection con = null;
try {
con = getConnection();
OracleCallableStatement stmt = (OracleCallableStatement) con.prepareCall("{call plsqlStoredProc(? )}");
String message="Test for Clob";
try
oracle.sql.CLOB cl = new oracle.sql.CLOB( (OracleConnection) con);
//byte[] msg = message.getBytes("UTF8");
//CLOB cl = new CLOB( (OracleConnection) con, msg);
if ( cl == null ) System.out.println("clob is null");
long index = cl.getLength();
System.out.println("length is " + l );
int i = cl.putString(index+1, message);
stmt.setCLOB(1, cl);
stmt.executeUpdate();
catch (SQLException excep)
System.out.println(excep.getMessage());
excep.printStackTrace();
//new LogException(excep.getMessage());
} catch (Exception e ) {
System.out.println("caught exception " + e.toString());
e.printStackTrace();
} finally {
try { if (con != null ) con.close(); } catch ( Exception e){ }
I get the following error
caught exception java.lang.NullPointerException:
java.lang.NullPointerException:
at oracle.sql.Datum.getBytes(Datum.java:147)
at oracle.jdbc.driver.OraclePreparedStatement.setCLOB(OraclePreparedStat
ement.java)
at oracle.sql.CLOB.plsql_write(Compiled Code)
at oracle.jdbc.ttc7.TTC7Protocol.lobWrite(TTC7Protocol.java)
at oracle.sql.CLOB.putChars(CLOB.java)
at oracle.sql.CLOB.putString(CLOB.java)
at TestClob3.main(TestClob3.java:38)
Can anybody tell me how I can create a CLOB in jdbc to pass it over to a PL/SQL stored proc.
When I test the stored procedure using a PL/SQL proc ( creating a temporary clob and passing it to the stored proc ) it works fine.
Can somebody point out the mistake in my code. Appreciate it.
Thanks.
null

Answer 1

Hello,
First of i must admit that i am naive to installation softwares. But i can tell u that u can create tables using java and jdbc. I have done it myself. As far as creating database in concerned i haven't tried it out yet. But my gut feeling is that u can create it. I u are interested in having a look at the sample code then here it is.
import java.sql.*;
public class demoddl
public static void main(String[] args) throws SQLException
try
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@10.0.0.8:1521:oraserv","scott","lion");
Statement stmt = con.createStatement();
boolean b = stmt.execute("create table demoddl(a number)");
System.out.println("Boolean
catch(Exception e)
System.out.println("Exception="+e.toString());
}