derby database source code.good for you.

				package org.apache.derbyTesting.functionTests.tests.jdbcapi;												import java.sql.*;								import org.apache.derby.tools.ij;				import org.apache.derby.tools.JDBCDisplayUtil;								public class prepStmtNull {								    public static void main(String[] args) {				        test1(args);				        test2(args);				        test3(args);				    }				    				        public static void test1(String []args) {   				                Connection con;				                ResultSet rs;				                PreparedStatement stmt = null;				                PreparedStatement pStmt = null;				                Statement stmt1 = null;								                System.out.println("Test prepStmtNull starting");								                try				                {				                        // use the ij utility to read the property file and				                        // make the initial connection.				                        ij.getPropertyArg(args);				                        con = ij.startJBMS();																con.setAutoCommit(false);                        			              				                        				                        stmt = con.prepareStatement("create table nullTS(name varchar(10), ts timestamp)");				   			stmt.executeUpdate();				   			con.commit();				   							   			pStmt = con.prepareStatement("insert into nullTS values (?,?)");				   			   							   			pStmt.setString(1,"work");							pStmt.setNull(2,java.sql.Types.TIMESTAMP);							pStmt.addBatch();																	pStmt.executeBatch();							con.commit();											stmt1 = con.createStatement();						        rs = stmt1.executeQuery("select * from nullTS");							while(rs.next()) {							   System.out.println("ResultSet is: "+rs.getObject(1));							   System.out.println("ResultSet is: "+rs.getObject(2));							}				 		} catch(SQLException sqle) {				 		   dumpSQLExceptions(sqle);				 		   sqle.printStackTrace();				 		} catch(Throwable e) {				 		   System.out.println("FAIL -- unexpected exception: "+e);				                   e.printStackTrace();								 		}				     }				     				     public static void test2(String []args) {   				                Connection con;				                ResultSet rs;				                PreparedStatement stmt = null;				                PreparedStatement pStmt = null;				                Statement stmt1 = null;								                System.out.println("Test prepStmtNull starting");								                try				                {				                        // use the ij utility to read the property file and				                        // make the initial connection.				                        ij.getPropertyArg(args);				                        con = ij.startJBMS();																con.setAutoCommit(false);                        			              				                        				                        stmt = con.prepareStatement("create table nullBlob(name varchar(10), bval blob(16K))");				   			stmt.executeUpdate();				   			con.commit();				   							   			pStmt = con.prepareStatement("insert into nullBlob values (?,?)");				   			   							   			pStmt.setString(1,"blob");							pStmt.setNull(2,java.sql.Types.BLOB);							pStmt.addBatch();																	pStmt.executeBatch();							con.commit();											stmt1 = con.createStatement();						        rs = stmt1.executeQuery("select * from nullBlob");							while(rs.next()) {							   System.out.println("ResultSet is: "+rs.getObject(1));							   System.out.println("ResultSet is: "+rs.getObject(2));							}				 		} catch(SQLException sqle) {				 		   dumpSQLExceptions(sqle);				 		   sqle.printStackTrace();				 		} catch(Throwable e) {				 		   System.out.println("FAIL -- unexpected exception: "+e);				                   e.printStackTrace();								 		}				     }				     				     /* Test setNull() on Clob/Blob using Varchar/binary types */				     public static void test3(String []args) {				          Connection con;				          ResultSet rs;				          PreparedStatement stmt = null;				          PreparedStatement pStmt = null;				          Statement stmt1 = null;				          byte[] b2 = new byte[1];				          b2[0] = (byte)64;								          System.out.println("Test3 prepStmtNull starting");								          try				          {				               // use the ij utility to read the property file and				               // make the initial connection.				               ij.getPropertyArg(args);				               con = ij.startJBMS();													               stmt = con.prepareStatement("create table ClobBlob(cval clob, bval blob(16K))");				               stmt.executeUpdate();				   							               pStmt = con.prepareStatement("insert into ClobBlob values (?,?)");				   			   							               pStmt.setNull(1, Types.VARCHAR);				               pStmt.setBytes(2, b2);				               pStmt.execute();								               stmt1 = con.createStatement();				               rs = stmt1.executeQuery("select * from ClobBlob");				               while(rs.next()) {				                    System.out.println("ResultSet is: "+rs.getObject(1));				               }				          } catch(SQLException sqle) {				               dumpSQLExceptions(sqle);				          } catch(Throwable e) {				               System.out.println("FAIL -- unexpected exception: ");				          }				     }				     				     static private void dumpSQLExceptions (SQLException se) {				                System.out.println("FAIL -- unexpected exception");				                while (se != null) {				                        System.out.println("SQLSTATE("+se.getSQLState()+"): "+se);				                        se = se.getNextException();				                }				        }				}