Java and BLOB

Question

Help...
I need samples for storing files into BLOB by using Java code.
Anyone knows?

Answer 1

Here is my full code:
/* This program is for testing Java and BLOB function */
import java.io.*;
import java.util.*;
import java.lang.*;
import java.sql.*;
import oracle.jdbc.driver.*;
import oracle.sql.*;
public class BlobApplication {
static Connection con=null;
// static Statement stmt,stmt1,stmt2,stmt3=null;
// static ResultSet rs,rs1,rs2,rs3=null;
// static OracleConnection con=null;
static OracleStatement stmt,stmt1,stmt2,stmt3=null;
static OracleResultSet rs,rs1,rs2,rs3=null;
static String sqlStr,sqlStr1,sqlStr2,sqlStr3="";
static long blobLength;
     public static void main(String args[]) {
          try{     
               Class.forName
("oracle.jdbc.driver.OracleDriver");
               //con=(OracleConnection)
DriverManager.getConnection
("jdbc:oracle:thin:@172.18.41.8:1521","EDB","edb");      
               con=(OracleConnection)
DriverManager.getConnection
("jdbc:oracle:oci8:@t18new","EDB","edb");      
               //con=DriverManager.getConnection
("jdbc:oracle:oci8:@t18new","EDB","edb");      
               BlobApplication lobApp=new
BlobApplication();
               lobApp.insertIntoLobTable("bfile1.dat");
               //lobApp.insertIntoLobTable
("bfile2.dat");
               //lobApp.insertIntoLobTable
("bfile3.dat");
               lobApp.saveBlobTableToDisk();
               con.close();     
          } catch (Exception e) {
               e.printStackTrace();
     void insertIntoLobTable(String blobFilename){
          try {
     stmt=(OracleStatement)con.createStatement
     //stmt=con.createStatement();     
          stmt.execute("insert into lobtable
(blobfilename,blobdata) values ('"+blobFilename+"', EMPTY_BLOB
          insertBLOB(blobFilename);
stmt.close();
          catch (SQLException ex) {
               System.err.println("Could not insert
into the table lobtable \n"+ex);
               System.exit(1);
     void insertBLOB(String filename) throws SQLException {
          try {
               BLOB aBLOB=null;     
               System.out.println(filename);     
               File aFile=new File(filename);
               FileInputStream aFileInputStream=new
FileInputStream(aFile);               
     stmt1=(OracleStatement)con.createStatement();
     //stmt1=con.createStatement();     
          //sqlStr1="select * from lobtable where
blobfilename='"+ filename +"' for update";
               System.out.println("before query");
          rs1=(OracleResultSet)stmt1.executeQuery
("select * from lobtable where blobfilename='"+ filename +"' for
update");               
          //rs1=stmt1.executeQuery(sqlStr1);          
          //stmt1.executeQuery(sqlStr1);
               System.out.println("after query");
               while (rs1.next()) {
               System.out.println("in the loop");
          aBLOB=rs1.getBLOB(2);               
                         //int
chunkSize=rs1.getBLOB("blobdata").getChunkSize();
                         int
chunkSize=aBLOB.getChunkSize();
                         byte[] buffer=new byte
[chunkSize];
                         int lenRead;
                         long offset=1;
                         while
((lenRead=aFileInputStream.read(buffer)) != -1) {
                              if (blobLength<
offset) buffer=new byte[lenRead];
                              //rs1.getBLOB
("blobdata").putBytes(offset,buffer);
                              aBLOB.putBytes
(offset,buffer);
                              offset+=lenRead;
          rs1.close();
stmt1.close();                    
                    aFileInputStream.close();
          catch(IOException e) {
               System.err.println("Error in
reading "+filename+"\n"+e);
               System.exit(1);
     void saveBlobTableToDisk() {
          try {
     stmt2=(OracleStatement)
con.createStatement();     
     //stmt2=con.createStatement();     
          sqlStr2="SELECT blobfilename,blobdata
FROM LOBTABLE";
          rs2=(OracleResultSet)stmt2.executeQuery
(sqlStr2);
          //rs2=stmt2.executeQuery(sqlStr2);
               while (rs2.next()) {     
                    writeBlobToDisk(rs2.getString
("blobfilename"), rs2.getBLOB("blobdata"));
          rs2.close();
stmt2.close();                    
          catch (SQLException ex) {
               System.err.println("Could not save to
disk \n"+ex);
               System.exit(1);
     void writeBlobToDisk(String filename,BLOB readBlob)
throws SQLException {
          try {
               File aFile=new File("blob_"+filename);
               FileOutputStream aFileOutputStream=new
FileOutputStream(aFile);
               int chunkSize=readBlob.getChunkSize();
               byte[] buffer=new byte[chunkSize];
               blobLength=readBlob.length();
               for (long pos=1; pos<blobLength;
pos+=chunkSize) {
                    chunkSize=readBlob.getBytes
(pos,chunkSize,buffer);
                    aFileOutputStream.write
(buffer,0,chunkSize);
               aFileOutputStream.close();
          catch (IOException e) {
               System.err.println("Error in
writing "+filename+"\n"+e);
               System.exit(1);
} // End of BLobApplication
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