Blob Problem

Question

Hello,
The problem that i have is that i want to insert a file residing in the network into the oracle database into a blob field and again read it from the database and show it ie either insert it into a file directly and then open it using the correct editor or open it directly. I am using java along with it but i am basically stuck on the database side.
I am sending the code which i have written till date
i basically need to know
1)the syntax i am using to interact with the database is right ie where is the error in the code
2)provided that is ok whether my overall code is on the right track.
The error message i am getting:
java.sql.exe:ORA-06550 line col22
PLS 00302: Component GETCHUNKSIZE must be declared
ORA-06550 line1 col 7
pl/sql statement ignoured
My developopment enviornment is JDeveloper3.0 as this code is having problems compiling in JDK as Jdeveloper overides a few of the jdk classes.
=========================================================================
My table structure
CREATE TABLE DOC_MAS(
DOC_MAS_SR_NO NUMBER(10),
PROJECT_NAME VARCHAR2(30),
MODULE_NO NUMBER(10),
DOC_NAME VARCHAR2(10),
DOC_TYPE VARCHAR2(10),
VERSION NUMBER(10));
CREATE SEQUENCE SEQ_DOC_MAS START WITH 1 INCREMENT BY 1;
CREATE SEQUENCE SEQ_DOC_DETAIL START WITH 1 INCREMENT BY 1;
CREATE TABLE DOC_DETAIL(
DOC_DETAIL_SR_NO NUMBER(10),
DOC_MAS_SR_NO NUMBER(10),
DATE_OF_INSERT DATE,
ACTUAL_DOC BFILE,
COMMENTS VARCHAR2(500));
===============================================================================
My connection code:
public class ConnectionParams {
// The machine on which the database resides
//public final static String s_hostName = "insn110a.in.oracle.com";
public final static String s_hostName = "192.168.1.1";
// The TNS listener port
public final static String s_portNumber = "1521";
// The database name (SID)
//public final static String s_databaseSID = "otndb";
public final static String s_databaseSID = "orcl";
// The database User ID
public final static String s_userName = "scott";
// The database user password
public final static String s_password = "tiger";
========================================================================================
import java.io.*;
import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.driver.*;
import java.util.*;
import java.util.Date;
//import java.math.BigDecimal;
public class Sample2
Connection m_connection; //Database Connection Object
String p_doc_name=null;
String s_blobvariable = p_doc_name;
public Sample2()
dbConnection();
public static void main(String[] args)
Sample2 lobs = new Sample2();
// lobs.dbConnection();
lobs.readFileNameExt();
/*This class is for creation of connection =========================================*/
public void dbConnection() {
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
String l_dbConnectString =
"(DESCRIPTION=(ADDRESS=(HOST="+ConnectionParams.s_hostName+")"+
"(PROTOCOL=tcp)(PORT="+ConnectionParams.s_portNumber+"))"+
"(CONNECT_DATA=(SID="+ConnectionParams.s_databaseSID+")))";
m_connection = DriverManager.getConnection(
"jdbc:oracle:thin:@"+l_dbConnectString,
ConnectionParams.s_userName, ConnectionParams.s_password);
// m_connection.setAutoCommit(false);
System.out.println("Connection Successful");
Thread.sleep(3000);
} catch(Exception ex){ //Trap SQL errors
System.out.println("Error in Connecting to the Database "+ex.toString());
/*========================================================================================
File inserting section of the code
// THIS class gets the input from the file dialog box it gets the file path,projectName and the module no
//public void readFileNameExt(String p_doc_path,String p_module_no,String p_project_name)
public void readFileNameExt()
String p_doc_path = "c:/warea/Mehul2/TABLE5.xls";
int p_module_no = 10;
String p_project_name = "Finserve";
String p_doc_type= null;
String p_version = null;
StringTokenizer strtkn = new StringTokenizer(p_doc_path,"/");
while(strtkn.hasMoreTokens())
p_doc_name =strtkn.nextToken();
System.out.println("The file name is" +p_doc_name);
StringTokenizer strtoken = new StringTokenizer(p_doc_name,".");
while(strtoken.hasMoreTokens())
p_doc_type =strtoken.nextToken();
try{
System.out.println("The file Type is"+p_doc_type);
insertDocMas(p_doc_name,p_doc_type,p_project_name,p_module_no);
Thread.sleep(10000);
}catch (Exception e){}
}//end of method
//============================================== this class is for inserting the doc_mas details in teh table along with version checking
public void insertDocMas(String p_doc_name,String p_doc_type,String p_project_name,int p_module_no){
int p_version = -1;
int p_doc_mas_sr_no = -1;
// String verision=null;
int verision;
String s = null;
try{
Statement l_stmt = m_connection.createStatement();
ResultSet l_version_details = l_stmt.executeQuery("SELECT MAX(VERSION) FROM DOC_MAS WHERE DOC_NAME = '"+p_doc_name+"'");
if (l_version_details.next())
{ System.out.println("The Control 1");
verision = l_version_details.getInt(1);
System.out.println("The Control 2 : "+verision);
verision = verision +1;
else {
verision = 1;
System.out.println("The Control 3");
p_version = verision;
System.out.println("The value of p_version" + p_version);
l_version_details.close();
l_stmt.close();
Thread.sleep(4000);
}catch(Exception e){
System.out.println("Exception has occured at the time of insert"+e);
/* try{
Statement stmt = m_connection.createStatement();
ResultSet rset = stmt.executeQuery("select DEPTNO,DNAME,LOC from DEPT");
while(rset.next()){
BigDecimal deptno = rset.getBigDecimal(1,2);
String dname = rset.getString(2);
// Timestamp hiredate = rset.getTimestamp(3);
String loc = rset.getString(3);
System.out.println(deptno+" "+dname+" "+loc);
Thread.sleep(50000);
}catch(Exception e){System.out.println(e);}
try{
Statement l_stmt = m_connection.createStatement();
ResultSet l_seq_details = l_stmt.executeQuery("SELECT SEQ_DOC_MAS.NEXTVAL FROM DUAL");
if (l_seq_details.next())
p_doc_mas_sr_no = l_seq_details.getInt(1);
System.out.println("The Control AA");
System.out.println("The value of p_doc_mas_sr_no" + p_doc_mas_sr_no);
l_seq_details.close();
l_stmt.close();
Thread.sleep(4000);
}catch(Exception e){
System.out.println("Exception has occured at the time of selecting the current sequence number"+e);
try {
System.out.println("Creating rows in DOC_MAS.. ");
System.out.println("The Control VV");
PreparedStatement l_pstmt = m_connection.prepareStatement("insert into DOC_MAS(DOC_MAS_SR_NO,PROJECT_NAME,MODULE_NO,DOC_NAME,DOC_TYPE,VERSION) values(?,?,?,?,?,?)");//SEQ_DOC_MAS.nextval
l_pstmt.setInt(1,p_doc_mas_sr_no);//"SEQ_DOC_DETAIL.NEXTVAL"
l_pstmt.setString(2,p_project_name);
l_pstmt.setInt(3,p_module_no);
l_pstmt.setString(4,p_doc_name);
l_pstmt.setString(5,p_doc_type);
l_pstmt.setInt(6,p_version);
l_pstmt.executeUpdate(); // Execute SQL statement
l_pstmt.close();
System.out.println("The Control 3");
// Close statement
Thread.sleep(20000);
}catch(Exception e){
System.out.println("Exception has occured at the time of insert11"+e);
try{System.out.println("The Control 4");
Statement l_statement = m_connection.createStatement();
ResultSet l_doc_mas_sr_no = l_statement.executeQuery(
"SELECT max(DOC_MAS_SR_NO) FROM DOC_MAS "+
"WHERE DOC_NAME = '"+p_doc_name+"' ");//FOR UPDATE
if (l_doc_mas_sr_no.next())
p_doc_mas_sr_no = l_doc_mas_sr_no.getInt(1);
l_doc_mas_sr_no.close();
l_statement.close();
System.out.println("The Control 5");
Thread.sleep(10000);
}catch(Exception e){
System.out.println("Exception has occured at the time of insert");
loadSamples(p_doc_mas_sr_no,p_doc_name,p_doc_type);
}//Method insertDocMas() closing here
/*This class is for loading the data into the database==================================*/
public void loadSamples(int p_doc_mas_sr_no,String p_doc_name,String p_doc_type) {
int p_doc_detail_sr_no = -1;
Date p_sysdate = new Date() ;
try{
Statement l_stmt = m_connection.createStatement();
ResultSet l_seq_doc_details = l_stmt.executeQuery("SELECT SEQ_DOC_DETAIL.NEXTVAL FROM DUAL");
if (l_seq_doc_details.next())
p_doc_detail_sr_no = l_seq_doc_details.getInt(1);
System.out.println("The Control AA");
System.out.println("The value of p_doc_detail_sr_no" + p_doc_detail_sr_no);
l_seq_doc_details.close();
l_stmt.close();
Thread.sleep(4000);
}catch(Exception e){
System.out.println("Exception has occured at the time of selecting the current sequence number"+e);
try{
Statement l_st = m_connection.createStatement();
ResultSet l_date = l_st.executeQuery("SELECT sysdate FROM DUAL");
if (l_date.next())
p_sysdate = l_date.getDate(1);
System.out.println("The Control sysdate");
System.out.println("The value of p_sysdate" + p_sysdate);
l_date.close();
l_st.close();
Thread.sleep(4000);
}catch(Exception e){
System.out.println("Exception has occured at the time of selecting the sysdate"+e);
try {System.out.println("The Control 6");
System.out.println("Creating row for actual-doc in DOC_DETAILS.. ");
PreparedStatement l_pstmt = m_connection.prepareStatement("insert into DOC_DETAIL(DOC_DETAIL_SR_NO,DOC_MAS_SR_NO,DATE_OF_INSERT,ACTUAL_DOC)values(?,?,p_sysdate, empty_blob() )");
l_pstmt.setInt(1,p_doc_detail_sr_no);
l_pstmt.setInt(2,p_doc_mas_sr_no);
//l_pstmt.setDate(3,p_sysdate);
System.out.println("The Control 6AA");
l_pstmt.execute(); // Execute SQL statement
l_pstmt.close(); // Close statement
System.out.println("Created.\nLoading <map.gif> into BLOB column for doc_detail...");
System.out.println("The Control 7");
// Retrieve the row just inserted, and lock it for insertion of the
}catch(Exception e){
System.out.println("Exception has occured at the time of inserting blob locators"+e);
try {
// LOB columns.
System.out.println("The Control 7AAA");
Statement l_stmt = m_connection.createStatement();
ResultSet l_lobDetails = l_stmt.executeQuery(
"SELECT ACTUAL_DOC "+
"WHERE DOC_MAS_SR_NO = '"+p_doc_mas_sr_no+"'");
// Retrieve BLOB and CLOB streams for ACTUAL_DOC and TEXT_DOC
// columns, and load the sample files
System.out.println("The Control 8");
if (l_lobDetails.next())
// Get the BLOB locator and open output stream for the BLOB
BLOB l_mapBLOB = ((OracleResultSet)l_lobDetails).getBLOB(1);
OutputStream l_blobOutputStream = l_mapBLOB.getBinaryOutputStream();
System.out.println("The Control 9");
// Open the sample file as a stream for insertion into the BLOB column
File l_blobvariable = new File(s_blobvariable);
InputStream l_sampleFileStream=new FileInputStream(l_blobvariable);
System.out.println("The Control 10");
// Buffer to hold chunks of data to being written to the BLOB.
// In Oracle8.1.5 JDBC drivers a method getBufferSize() is available
// in the BLOB class, that returns the optimal buffer size
byte[] l_buffer = new byte[10* 1024];
System.out.println("The Control 11");
// Read a chunk of data from the sample file input stream, and write the
// chunk to the BLOB column output stream. Repeat till file has been
// fully read.
int l_nread = 0; // Number of bytes read
while ((l_nread= l_sampleFileStream.read(l_buffer)) != -1) // Read from file
l_blobOutputStream.write(l_buffer,0,l_nread); // Write to BLOB
System.out.println("The Control 12");
// Close both streams
l_sampleFileStream.close();
l_blobOutputStream.close();
System.out.println("Done Loading sample files");
System.out.println("\nRetrieving and displaying sample files..");
// Retrieve and display the LOB data just inserted
drawBLOB(l_mapBLOB,p_doc_name,p_doc_type);
//System.out.println("Done loading and displaying LOB data");
} //if statement closes here
l_lobDetails.close();// Close Result Set and statement
l_stmt.close();
} catch (Exception ex)
{ // Trap       SQL errors
System.out.println("Error loading sample files for the selected airport");
System.out.println("\n"+ex.toString());
}//Method closes here
* Retrieve the BLOB data from input BLOB column into a local file,
* and draws the image. The file type needs to be added here
public void drawBLOB(BLOB p_blob, String p_doc_name,String p_doc_type) {
//String fileType this should be passed at some point to ensure that the file gets the right extension
try {
// Open a stream to read the BLOB data
InputStream l_blobStream = p_blob.getBinaryStream();
// Open a file stream to save the BLOB data
FileOutputStream l_fileOutStream = new FileOutputStream(p_doc_name+"."+p_doc_type);
// Read from the BLOB data input stream, and write to the file output
// stream
byte[] l_buffer = new byte[10]; // buffer holding bytes to be transferred
int l_nbytes = 0; // Number of bytes read
while ((l_nbytes = l_blobStream.read(l_buffer)) != -1) // Read from BLOB stream
l_fileOutStream.write(l_buffer,0,l_nbytes); // Write to file stream
// Flush and close the streams
l_fileOutStream.flush();
l_fileOutStream.close();
l_blobStream.close();
//m_GUI.drawMap(p_doc_name,p_doc_type);
// Draw retrieved image to GUI
drawMap(p_doc_name,p_doc_type);
} catch (Exception ex) { // Trap SQL and IO errors
System.out.println("Error in retrieving and drawing map for selected airport");
System.out.println("\n"+ex.toString());
* Create a label from the image filepassed, add the label to the image area
This part will have to be modified majorly
public void drawMap(String p_doc_name,String p_doc_type) {
//Refer to SIRExtOpen.java
Runtime r = Runtime.getRuntime();
Process p = null;
if (p_doc_type.equals("html")&#0124; &#0124;p_doc_type.equals("htm"))
try{
p = r.exec( "C:\\Program Files\\Internet Explorer\\Iexplore.EXE " + p_doc_name);
//repaint();
p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
if(p_doc_type.equals("txt")&#0124; &#0124; p_doc_type.equals("sql")&#0124; &#0124; p_doc_type.equals("java"))
try
p = r.exec( "C:\\WINDOWS\\notepad.EXE " + p_doc_name); p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
} // end of txt , sql , java if
if(p_doc_type.equals("xls"))
try
p = r.exec( "C:\\Program Files\\Microsoft Office\\Office\\excel.EXE " + p_doc_name);p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
} // end of xls if
if(p_doc_type.equals("fmb"))
try
p = r.exec( "C:\\Program Files\\Accessories\\wordpad.exe " + p_doc_name);p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
} // end of fmb if
if(p_doc_type.equals("doc"))
try
p = r.exec( "C:\\Program Files\\Accessories\\wordpad.exe " + p_doc_name);p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
} // end of doc if
if(p_doc_type.equals("mpp"))
try
p = r.exec( "C:\\Program Files\\Accessories\\wordpad.exe " + p_doc_name);p.waitFor();
catch(Exception ex)
ex.printStackTrace();
System.out.println(ex);
System.out.println(ex.getMessage());
} // end of mpp if
//Here you can write a statement for deleting the file in the root directory once the file is opened using any editor
}//end of method
}//This is the class closing
* This method is called when a row is selected from the combo.
* It checks if there exists data in DOC_DETAIL for the selected
* file. If there exists data, it calls drawBLOB and writeCLOB to
* display the data
/*public void fileSelected(String p_doc_mas_sr_no,String p_doc_name,String p_doc_type) {
try {
System.out.println("Retrieving LOB details for selected file..");
// Create a SQL statement
Statement l_stmt = m_connection.createStatement();
// Query DOC_DETAILS for the selected file
java.sql.ResultSet l_lobDetails = l_stmt.executeQuery(
"SELECT ACTUAL_DOC FROM DOC_DETAILS "+
"WHERE DOC_MAS_SR_NO='"+p_doc_mas_sr_no+"'");
// Check if LOB columns exist
if (l_lobDetails.next()) {
// LOB details exist
// Display airport map and suggestion book (LOB details)
drawBLOB(l_lobDetails.getBlob(1),p_doc_name,p_doc_type);
//lobs.drawBLOB(((OracleResultSet)l_lobDetails).getBLOB(1),p_doc_name,p_doc_type);
//Should this be like this
System.out.println("Done retrieving and displaying LOB details");
} else {
// No LOB details
// m_GUI.m_loadButton.setEnabled(true);
//TO BE CHECKED OUT LATER m_loadButton This is a button in the form
System.out.println("No airport map and suggestion book exist for selected airport");
System.out.println("\nPress <Load Sample2 Files> to load LOB details");
l_lobDetails.close();
l_stmt.close();
} catch (Exception ex) { // Trap SQL errors
System.out.println("Error retrieving LOB Details for the selected airport");
System.out.println(ex.toString());

Answer 1

You are probably better off using BLOBs rather than BFILEs. The main reason for this is that with BLOBs data integrity between file and its meta data in the database are managed and protected by the RDBMS. BFILEs are useful for legacy systems where the files already exist in some form of meaningful and managed structure that needs to be preserved.
There is a down side to BLOBs and that is performance - BLOBs are relatively slow to load into the database. However, its not too bad and the performance of extracting BLOBs out from the database is quite reasonable the bottleneck is more likely to be your LAN.
In order to use BLOBs it is important to have the right class libraries involved. For BLOBs you must use the classes12.zip (supplied with the database) for JDBC2 support and furthermore put this class high up the list of class libraries if you do not you may find that your code compiles but raises a runtime exception about invalid data types; this is because the wrong definition of the Blob class is being picked up.
Assuming that you are using BLOBs then the following describes the techniques for storing files as BLOBs in an Oracle database.
LOADING BLOBS
Assuming that you have a table with a BLOB column in it then to load a BLOB you must first create the record containing the BLOB by inserting a row into your table with the value of the BLOB column set to EMPTY_BLOB( ) (PL/SQL built in):
INSERT INTO tablex( col1, col2, colBLOB )
VALUES( val1, val2, EMPTY_BLOB() )
Then you must row lock this record and obtain the LOB locator for the BLOB just created:
stmt = connection.createStatement();
query = "SELECT colBLOB FROM tablex WHERE ... FOR UPDATE OF colBLOB";
ResultSet lockLOBSet = stmt.executeQuery(query);
At this point you should be able to use lockLOBSet.getBlob(1) to create a binary stream to load the BLOB directly into the database. Under Java Developer 2 I could never get this to work and havent tried since with Java Developer 3. Instead I used the PL/SQL DBMS_LOB package and did it using JDBC; this assumes that the file has been loaded into a buffer binaryFile and note that the maximum chunk size that dbms_lob.write can be called with is 32K:
blobLoc = lockLOBSet.getBlob(1);
while(amountWritten < fileSize)
if ((amountWritten + writeAmount) <= fileSize)
writeAmount = 32000;
else
writeAmount = fileSize - amountWritten;
System.arraycopy(binaryFile, amountWritten, buffer, 0, writeAmount);
CallableStatement cstmt =
connection.prepareCall("{call dbms_lob.write(?, ?, ?, ?)}");
cstmt.setBlob(1, blobLoc);
cstmt.setLong(2, writeAmount);
cstmt.setLong(3, amountWritten + 1);
cstmt.setBytes(4, buffer);
cstmt.execute();
cstmt.close();
amountWritten = amountWritten + writeAmount;
EXTRACTING BLOBS
Binary streams do work when it comes to reading BLOBs out of the database so things are a whole lot simpler probably worth trying it with loading BLOBs now as well.
ResultSet queryLOBSet = statement.executeQuery(query);
if(queryLOBSet.next())
lobSize = queryLOBSet.getInt(1);
blobLoc = queryLOBSet.getBlob(2);
BufferedInputStream bi;
blobBuffer = new byte[lobSize];
bi = new BufferedInputStream(blobLoc.getBinaryStream());
amountRead = bi.read(blobBuffer);
bi.close();
Regards,
Bob
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