Blob to byte[] detach failure
Hi,
I'm unable to detach a byte array using Kodo 3.3.4 and PostgreSQL 8.0. The
byte array in the detached object is always empty despite there being
bytes in the database table for the correspond column/row. Other fields
are detached correctly.
In my JDO file -
<field name="image">
<!-- Map image to BLOB field -->
<extension vendor-name="kodo" key="jdbc-field-map-name" value="blob">
<extension vendor-name="kodo" key="column" value="image"/>
</extension>
</field>
This correctly creates a column of named 'image' of type 'bytea' in the
table.
This issue isn't listed in the know issues for PostgresQL - can anybody
else confirm they have this working with this database? I see there was a
similar problem with mySQL posted here, but then that issue wasn't
documented either.
Thanks,
Andy.
byte[] fields aren't in the default fetch group by default, and
detachment only occurs on fields in the DFG. Both of these options
(whether the field is in the DFG, and whether detachment works on DFG
fields or uses some other criteria), are configurable. I assume you
know how to control DFG settings; the documentation on detachment is here:
http://www.solarmetric.com/Software/Documentation/latest/docs/ref_guide_remote.html#ref_guide_detach_graph
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Exception getting blob to byte[]
Hy guys,
I 've a problem with my java application.
I use hibernate to interact with a derby database.
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catch (SQLException e)
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finally
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catch (IOException ex)
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int dataSize = is.read(buf);
if (dataSize == -1) break;
baos.write(buf, 0, dataSize);
catch(IOException ex)
throw ex;
finally
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Thanks,
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So could you cite some references that show, in general, that one normally needs to process blobs as streams?The design. The name, which is an acroynm for Binary Large Object. The fact that they have a stream interface, like files and sockets.The idiom for loading does not require nor even recommend that one must process as a stream.
And most of the time I do not process files nor sockets via streaming methodologies. I load them entirely, then process them.
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Hi,
In my table, one of the columns is of type BLOB. When I generate Java objects out of the database, the type of this column becomes java.sql.Blob. This seems to be the default mapping. I want it to be of type byte[].
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Hi all,
I am having a requirement to read a blob stored in the oracle table and convert it into bytes. I am loading this table (wwv_flow_files) with APEX.
The code under page 1 is as follows:
DECLARE
z number;
y varchar2(4000);
x varchar2(400);
b blob;
BEGIN
select filename,blob_content into x ,b from APEX_APPLICATION_files where name =:P1_FILE_NAME;
select length(convertBlobToBytes(b)) into z from dual;
:P1_RESULT := z;
end;
Java code is as follows:
import java.io.*;
import java.sql.Blob;
public class convertBlob {
* @param blob
* @return
public static byte[] convertBlobToBytes(Blob blob) {
if (blob==null) return null;
try {
InputStream in = blob.getBinaryStream();
int len = (int) blob.length(); //read as long
long pos = 1; //indexing starts from 1
byte[] bytes = blob.getBytes(pos, len);
in.close();
return bytes;
catch (Exception e) {
System.out.println(e.getMessage());
return null;
PL/SQL wrapper is as follows:
CREATE OR REPLACE FUNCTION convertBlobToBytes(p1 IN BLOB) RETURN LONG RAW AUTHID CURRENT_USER AS LANGUAGE JAVA NAME 'convertBlob.convertBlobToBytes(java.sql.Blob) return byte[]';
I loaded this java class and pl/sql wrapper into the database using JDEVELOPER.
But I am getting the length of the file, as twice the size.
For example, When I run the program which reads the file returns the length of the file as a byte array, the length is 819.
When I pass the same file as a blob from apex, to the java program that converts blob to bytes, the length of the file is 1638.
And hence I am getting wrong results, further in the process.
Can you please help me? Any help is appreciated.
rgds,
Suma.The example on this page is showing how to read a blob in portions you determine yourself:
http://apex.oracle.com/pls/otn/f?p=31517:91
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
------------------------------------------------------------------- -
Plesae help- needing to read a blob from db into bytes[]
Hi all,
I am having a requirement to read a blob stored in the oracle table and convert it into bytes. I am loading this table (wwv_flow_files) with APEX.
The code under page 1 is as follows:
DECLARE
z number;
y varchar2(4000);
x varchar2(400);
b blob;
BEGIN
select filename,blob_content into x ,b from APEX_APPLICATION_files where name =:P1_FILE_NAME;
select length(convertBlobToBytes(b)) into z from dual;
:P1_RESULT := z;
end;
Java code is as follows:
import java.io.*;
import java.sql.Blob;
public class convertBlob {
* @param blob
* @return
public static byte[] convertBlobToBytes(Blob blob) {
if (blob==null) return null;
try {
InputStream in = blob.getBinaryStream();
int len = (int) blob.length(); //read as long
long pos = 1; //indexing starts from 1
byte[] bytes = blob.getBytes(pos, len);
in.close();
return bytes;
catch (Exception e) {
System.out.println(e.getMessage());
return null;
PL/SQL wrapper is as follows:
CREATE OR REPLACE FUNCTION convertBlobToBytes(p1 IN BLOB) RETURN LONG RAW AUTHID CURRENT_USER AS LANGUAGE JAVA NAME 'convertBlob.convertBlobToBytes(java.sql.Blob) return byte[]';
I loaded this java class and pl/sql wrapper into the database using JDEVELOPER.
But I am getting the length of the file, as twice the size.
For example, When I run the program which reads the file returns the length of the file as a byte array, the length is 819.
When I pass the same file as a blob from apex, to the java program that converts blob to bytes, the length of the file is 1638.
And hence I am getting wrong results, further in the process.
Can you please help me? Any help is appreciated.
rgds,
Suma.Hi all,
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rgds,
Suma. -
Should I be able to update a Blob via a ResultSet? (11g driver exception)
This code fails at the last line:
stmt = conn.createStatement();
String tableName = "TBL_esun01_PPP";
stmt.execute("drop table TBL_esun01_PPP");
stmt.execute("create table TBL_esun01_PPP (sid int not null primary key, blob_col blob)");
stmt.close();
//insert test data
String blobContent = "WLS JDBC4 test for blob.";
String blobContentUpdate = "WLS JDBC4 test for UpdateBlob. [Updated]";
ByteArrayInputStream inputStream = new ByteArrayInputStream(blobContent.getBytes());
ByteArrayInputStream inputStreamUpdate = new ByteArrayInputStream(blobContentUpdate.getByte
s());
String insertSql = "INSERT INTO " + tableName + " VALUES (?, ?)";
PreparedStatement pstmt = conn.prepareStatement(insertSql);
int key = 1;
pstmt.setInt(1, key);
pstmt.setBlob(2, inputStream);
pstmt.execute();
pstmt.close();
inputStream.close();
//update data
String querySql1 = "SELECT sid FROM " + tableName;
String querySql2 = "SELECT sid, blob_col FROM " + tableName;
Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
// we can get updatable resultset in the same way without lob object.
// following updating can succeed.
System.out.println("Get updatable resultset using: "+querySql1);
ResultSet rs = stmt.executeQuery(querySql1);
rs.next();
rs.updateInt(1, 2);
rs.updateRow();
rs.close();
inputStreamUpdate.close();
System.out.println("Get updatable resultset using: "+querySql2);
try {// failed to get updatable resultset
rs = stmt.executeQuery(querySql2);
rs.next();
rs.updateBlob(2, inputStreamUpdate); // Fails here...
The driver is 11.1.0.6.0-Production
The DBMS is Oracle Database 11g Release 11.1.0.0.0 - Production
Get updatable resultset using: SELECT sid FROM TBL_esun01_PPP
Get updatable resultset using: SELECT sid, blob_col FROM TBL_esun01_PPP
We can not get updatable Resultset. Exception message:
java.sql.SQLException: Invalid operation for read only resultset: updateBlob
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:173)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:229)
at oracle.jdbc.driver.BaseResultSet.updateBlob(BaseResultSet.java:506)
at TestUpdatableRS.test(TestUpdatableRS.java:84)
at TestUpdatableRS.main(TestUpdatableRS.java:112)
thanks,
JoeJoe,
a) I could not find updateBlob(int, java.io.InputStream). It is updateBlob(int, java.sql.Blob).
b) I tried the below test and it worked fine, I am using the latest drivers.
CREATE TABLE BLOB_TABLE (C1 NUMBER, C2 BLOB);
INSERT INTO BLOB_TABLE VALUES(55, '101011');
public static void test2(Connection conn) throws SQLException {
System.out.println("test -");
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
String query = "select c1, c2 FROM blob_table";
pstmt = conn.prepareStatement(query, ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
rs = pstmt.executeQuery();
SQLWarning x = pstmt.getWarnings();
if (x != null)
System.out.println(x.getMessage());
x = rs.getWarnings();
if (x != null)
System.out.println(x.getMessage());
BLOB blob = BLOB.createTemporary(conn, true, BLOB.DURATION_SESSION);
byte[] b = new byte[50];
java.util.Arrays.fill(b, (byte) 53);
blob.putBytes(1L, b);
if (rs.next()) {
rs.updateInt(1, 88);
rs.updateBlob(2, blob);
rs.updateRow();
x = rs.getWarnings();
if (x != null) {
System.out.println(x.getMessage());
} catch (SQLException ea) {
System.out.println(ea);
} finally {
if (rs != null) {
rs.close();
if (pstmt != null) {
pstmt.close();
System.out.println("test - done");
} // end of test2(Connection);
==
Ashok -
BLOB insert behavior with thin driver using standard JDBC2.0 and ORACLE-JDBC2.0API
We have a problem with a BLOB insert to an oracle 8.1.7 DB using Oracle 8.1.7 JDBC thin driver.We get socket read/write error after inserting 32k of data using the standard JDBC2.0 API but using the Oracle JDBC2.0API (using OracleResultSet) it goes fine. We have a requirement to use the standard JDBC2.0 so that our code works with multiple database vendors. Is there another way to get in the blob data with standard JDBC API & using thin driver...?
thanks,
Madhu
Here is my sample test program that does both standard & oracle specific JDBC Blob test insert.
import java.sql.*;
import java.io.*;
import oracle.sql.BLOB;
import oracle.jdbc.driver.OracleResultSet;
public class testBLOB {
//trying to insert a huge file to a BLOB
static String fileName = "/kernel/genunix";
public static void main(String[] args) {
String driverName = "oracle.jdbc.driver.OracleDriver";
String dbURL = "jdbc:oracle:thin:@localhost:1521:test"; //thin driver
String user = "BlobTest";
String passwd = "BlobTest";
Connection con=null;
try {
Class.forName(driverName);
con=DriverManager.getConnection(dbURL, user,passwd);
catch (Exception e) {
e.printStackTrace();
close(con);
int i = 0;
while (i < args.length) {
if (args.equals("-f"))
fileName = args[++i];
i++;
System.out.println("The file being Stored is: "+fileName);
createTable(con);
insertUsingOracleAPI(con);
insertUsingJDBC20API(con);
//readDB(con);
static String getFileName() {
return fileName;
public static void close(Connection con) {
try {
if (con != null) {
con.close();
catch (Exception e) {
System.exit(-1);
public static void createTable(Connection con) {
Statement stmt ;
try {
stmt = con.createStatement();
stmt.execute("DROP TABLE basic_blob_table");
stmt.close();
catch (SQLException sqlEx) {
System.out.println("Dropped the Table");
try {
stmt = con.createStatement();
stmt.execute("CREATE TABLE basic_blob_table ( x varchar2(30), b blob)");
stmt.close();
catch (SQLException sqlEx) {
sqlEx.printStackTrace();
close(con);
System.out.println("Created the Table");
public static void insertUsingOracleAPI(Connection con) {
OutputStream os = null;
Statement stmt = null;
ResultSet rs = null;
FileInputStream is = null;
try {
con.setAutoCommit(false);
stmt = con.createStatement();
stmt.execute("INSERT INTO basic_blob_table VALUES( 'OracleAPI', empty_blob())");
System.out.println("Inserted the dummy Row");
rs = stmt.executeQuery("Select * from basic_blob_table where x='OracleAPI'");
if (rs != null && rs.next()) {
BLOB blob = ((OracleResultSet)rs).getBLOB(2);
File file = new File(getFileName());
is = new FileInputStream(file);
os = blob.getBinaryOutputStream();
byte[] chunk = new byte[1024];
int length = -1;
while((length = is.read(chunk)) != -1)
os.write(chunk, 0,length);
System.out.println("Inserted the File " + getFileName() );
catch (Exception e) {
e.printStackTrace();
finally {
try {
if (os != null) {
os.flush();
os.close();
if (is != null)
is.close();
stmt.close();
con.commit();
con.setAutoCommit(true);
catch (Exception e) {}
public static void insertUsingJDBC20API(Connection con) {
PreparedStatement stmt = null;
FileInputStream is = null;
try {
stmt = con.prepareStatement("INSERT INTO basic_blob_table VALUES(?,?)");
File file = new File(getFileName());
is = new FileInputStream(file);
stmt.setString(1,"JDBC20API");
stmt.setBinaryStream(2,is,(int)file.length());
stmt.executeUpdate();
catch (Exception e) {
e.printStackTrace();
finally {
try {
if (is != null)
is.close();
stmt.close();
catch (Exception e) {}
nullThanks for the response.
I understand what you are saying...
that readers don't block writers in Oracle (the same is true in SQL Server 2000).
However, I don't see how my test case is working correctly with Oracle (the exact same code acting as I'm thinking it should with SQL Server, but I still think it is acting incorrectly with Oracle).
I have transaction A do this:
update <table> set <column2>=<value> where <column1>='1'
then I use Thread.sleep() to make that program hang around for a few minutes.
Meanwhile I sneak off and start another program which begins transaction B. I have transaction B do this:
select * from <table> where <column1>='1'
and the read works immediately (no blocking... just as you have said) however, transaction A is still sleeping, it has not called commit() or rollback() yet.
So what if transaction A were to call rollback(), the value read by transaction B would be incorrect wouldn't it ?
Both A and B use setAutoCommit(false) to start their transactions, and then call setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED).
Isn't that supposed to guarantee that a reader can only read what is committed ?
And if a row is in "flux"... in the process of having one or more values changed, then the database cannot say what the value will be ?
I can almost see what you are saying.
In letting the reader have what it wants without making it wait, I suppose it could be said that Oracle is holding true to the "only let committed data be read"
So if that's it, then what if I want the blocking ?
I want an entire row to be locked until whoever it in the middle of updating, adding, or removing it has finished.
Do you know if that can be done with Oracle ? And how ?
Thanks again for helping me. -
Error inserting BLOBs in OC4J 9.0.2.1
The following snippet of code works in oc4j 9.0.2.0.0 but not in OC4J 9.0.2.1 Any ideas why?
Thanks,
Rajiv
FileInputStream in = new FileInputStream(file.getPath());
conn.setAutoCommit(false);
ps = conn.prepareStatement("SELECT blob_info FROM trx_blob WHERE trx_blob_id = ? FOR UPDATE");
ps.setInt(1, blobID);
rs = ps.executeQuery();
rs.next();
BLOB blob = ((OracleResultSet) rs).getBLOB(1);
OutputStream outStream = blob.getBinaryOutputStream();
int size = blob.getBufferSize();
byte[] buffer = new byte[size];
int length = -1;
while ((length = in.read(buffer)) != -1) {
outStream.write(buffer, 0, length);
outStream.close();
in.close();
conn.commit();
The error I get is java.sql.SQLException: ORA-01002: fetch out of seqenceRajiv -- This looks like bug 2541604. Please ask your support representative for a patch.
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Using JSP/Servlet to write Word Document to BLOB
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I need some help pls
When I use a normal class with a main method, it loads the word document into a blob and I can read this 100%.Stunning.
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package mypackage1;
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import java.sql.PreparedStatement;
import java.sql.ResultSet;
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import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
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import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
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try
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String cmd = "SELECT * FROM so_cs.testlob WHERE docno = 1 FOR UPDATE";
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rset.next();
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FileInputStream instream = new FileInputStream(binaryFile);
OutputStream outstream = blob.getBinaryOutputStream();
int size = blob.getBufferSize();
byte[] buffer = new byte[size];
int length = -1;
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outstream.write(buffer, 0, length);
instream.close();
outstream.close();
conn.commit();
closeConnection(conn);
catch (Exception ex)
System.out.println("Error =- > "+ex.toString());
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Connection conn = null;
try
DriverManager.registerDriver(new OracleDriver());
conn = DriverManager.getConnection("jdbc:oracle:thin:@oraclu5:1600:dwz110","so_cs","so_cs");
catch (Exception ex)
System.out.println("Error getting conn"+ex.toString());
return conn;
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if (conn != null)
try
conn.close();
catch (Exception se)
System.out.println("Error closing connection in get last imei"+se.toString());
Works fine:
Here is the display servlet: Works when main class inserts file
package mypackage1;
import java.io.InputStream;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
import java.sql.Connection;
import oracle.jdbc.*;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import org.apache.log4j.Logger;
import Util_Connect.DataBase;
public class DisplayLOB extends HttpServlet
private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
static final Logger logger = Logger.getLogger(DisplayLOB.class);
public void init(ServletConfig config) throws ServletException
super.init(config);
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
//response.setContentType(CONTENT_TYPE);
//PrintWriter out = response.getWriter();
Connection conn = null;
PreparedStatement pstmt = null;
try
conn = getConnection("wizard");
//out.println("<html>");
//out.println("<head><title>DisplayLOB</title></head>");
//out.println("<body>");
//out.println("<p>The servlet has received a POST. This is the reply.</p>");
InputStream is=null;
oracle.sql.BLOB blob=null;
response.setContentType("application/msword");
//response.setContentType("audio/mpeg");
OutputStream os = response.getOutputStream();
String term = "1";
String query = "SELECT docdetail FROM testlob WHERE docno = 1";
pstmt = conn.prepareStatement(query);
ResultSet rs = pstmt.executeQuery();
while (rs.next())
blob=((OracleResultSet)rs).getBLOB(1);
is=blob.getBinaryStream();
int pos=0;
int length=0;
byte[] b = new byte[blob.getChunkSize()];
while((length=is.read(b))!= -1)
pos+=length;
os.write(b);
}//try
catch (Exception se)
se.printStackTrace();
finally
try
pstmt.close();
catch (Exception ex)
System.out.println("Error closing pstmt "+ex.toString());
//out.println("</body></html>");
//out.close();
private Connection getConnection(String dataBase)
Connection conn = null;
try
conn = DataBase.getPoolConnection(dataBase);
catch (Exception se)
logger.fatal("Error getting connection: ",se);
return conn;
private void closeConnection(Connection conn)
if (conn != null)
try
conn.close();
catch (Exception se)
logger.error("Error closing connection in get last imei",se);
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<%@ page import="org.apache.log4j.*"%>
<%@ page contentType="text/html; charset=ISO-8859-1" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>untitled</title>
<title>Wizard SMS Interface</title>
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response.setHeader("Cache-Control","no-cache");
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%>
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METHOD="POST"
ENCTYPE="multipart/form-data">
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<INPUT TYPE="SUBMIT" NAME="button" VALUE="Upload">
</FORM>
</body>
</html>
<font> <b>Copyright ©
<script>
var LMDate = new Date( document.lastModified );
year = LMDate.getYear();
document.write(display(year));
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Mobile Telephone Networks.
<p align="left"><i><b><font face="Georgia, Times New Roman, Times, serif" size="1"></font></b></i></p>
package co.za.mtn.wizard.admin;
import java.io.InputStream;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
import java.sql.Connection;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import org.apache.log4j.Logger;
import Util_Connect.DataBase;
public class UploadFile extends HttpServlet
private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
//static final Logger logger = Logger.getLogger(UploadFile.class);
public void init(ServletConfig config) throws ServletException
super.init(config);
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
String headerName = null;
Enumeration en = request.getHeaderNames();
try
while ( en.hasMoreElements() )
Object ob = en.nextElement();
headerName = ob.toString();
System.out.println("Value for headerNAme is >"+headerName+"<");
String aaa = request.getHeader(headerName);
System.out.println("Value for aa is >"+aaa+"<");
catch (Exception ex)
System.out.println("Error in extracting request headers"+ex.toString());
Connection conn = getConnection("wizard");
BLOB blob = null;
try
conn.setAutoCommit(false);
String cmd = "SELECT * FROM so_cs.testlob WHERE docno = 1 FOR UPDATE";
PreparedStatement pstmt = conn.prepareStatement(cmd);
ResultSet rset = pstmt.executeQuery(cmd);
rset.next();
blob = ((OracleResultSet)rset).getBLOB(2);
//File binaryFile = new File("h:\\callcenterpilot.doc");
//System.out.println("Document length = " + binaryFile.length());
//FileInputStream instream = new FileInputStream(binaryFile);
response.setHeader("Content-Type","application/vnd.ms-word");
String contentType = request.getContentType();
System.out.println("Content type received in servlet is >"+contentType+"<");
ServletInputStream instream = request.getInputStream();
OutputStream outstream = blob.getBinaryOutputStream();
int size = blob.getBufferSize();
byte[] buffer = new byte[size];
int length = -1;
while ((length = instream.read(buffer)) != -1)
outstream.write(buffer, 0, length);
instream.close();
outstream.close();
conn.commit();
closeConnection(conn);
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
catch (Exception ex)
System.out.println("Error =- > "+ex.toString());
//out.println("</body></html>");
//out.close();
private Connection getConnection(String dataBase)
Connection conn = null;
try
conn = DataBase.getPoolConnection(dataBase);
catch (Exception se)
System.err.println("Error getting connection: "+se.toString());
return conn;
private void closeConnection(Connection conn)
if (conn != null)
try
conn.close();
catch (Exception se)
System.err.println("Error closing connection in get last imei"+se.toString());
This is what the display servlet is showing when the JSP/Servlet insert the document
-----------------------------7d31422224030e
Content-Disposition: form-data; name="example"; filename="H:\(your name) Skills Matrix.doc"
Content-Type: application/msword
�� ࡱ � > �� � � ���� � � ���������������������
Tks
Andrehello,
there are multiple documents out there, describing the oracle reports server setup. try doc.oracle.com for documentation.
also it is part of the online-documentation.
you need to install 9iAS enterprise edition. the server is pre-configured and will listen to the url http://yourserver/dev60cgi/rwcgi60.exe
passing only this url you will get a help-screen, describing the syntax.
regards,
the oracle reports team -
How to store images in BLOB field in MySql database using java
Hi....
Currently am able to store character string into BLOB using byte array....in MySql.
but i cannot store images or pictures.......
to do this.........please help me out...............
Thanx..........:)Bye...........Hello,
I have done this for Oracle but it should be similar in MySQL also. Try reading thru these links below. Mail us if you have succeeded or not.
http://forum.java.sun.com/thread.jspa?forumID=48&threadID=654086
http://forum.java.sun.com/thread.jspa?forumID=48&threadID=384768
http://forum.java.sun.com/thread.jspa?forumID=48&threadID=549705
Thanks and regards,
Pazhanikanthan. P -
Upload a file in a BLOB Oracle variable
Hello all,
i am developing a web application to upload a binary file in an Oracle database (9i) in a BLOB variable.
the input is stored in a FILE object wich is temporary stored in a folder (C:\\APP). after the upload in the BLOB the file should be deleted. I get the following error
java.lang.NullPointerException
at com.merck.cdm.BlobOracle.insertBLOB(BlobOracle.java:98)
when I try to get the file for the FileInputStream. It seems I am not able to acces the FILE object once defined.
any help is welcome
thanks
claudio
this is the code:
package com.merck.cdm;
import java.sql.*;
import java.io.*;
import java.sql.PreparedStatement;
import java.util.*;
import com.oreilly.servlet.MultipartRequest;
import com.oreilly.servlet.multipart.DefaultFileRenamePolicy;
import javax.servlet.http.HttpServletRequest;
import oracle.jdbc.driver.*;
import oracle.sql.BLOB;
* Insert record in the MEDIA table
* MEDIA (file_name varchar2(256), file_content BLOB);
public class BlobOracle
private final static String hostname = "itpo0002.merck.com";
private final static String port = "1521";
private final static String sid = "TIRWEB";
private final static String username = "test_blob";
private final static String password = "password";
private static String fileLocation;
private static Connection connection;
public BlobOracle()
public boolean processAddRequest(HttpServletRequest request, String sAbsolutePath)
throws IOException, SQLException, Exception
boolean bParamsOk = true;
boolean bAttachOk = true;
//Acquire request parameters we need .
//5 MB's limit
//the work directory will be "TOMCAT_HOME\bin, and the user can provide another one like C:\workDir
//the file will be deleted as soon as the message will be sent
//m_mpReq = new MultipartRequest(request, ".", 5 * 1024 * 1024);
//m_mpReq = new MultipartRequest(request, "/opt/www/corp/ats-crf/java/ats-crf/attachment/", 5 * 1024 * 1024);
//String sWorkDir = File.separator + sAbsolutePath + "attachment" + File.separator;
MultipartRequest mpRequest = new MultipartRequest(request, "C:\\app", 8 * 1024 * 1024);
// upload file in a temp dir
//il form � di tipo enctype="multipart/form-data" e quindi il metodo getParameter di java.lang.string non funziona
//bisogna quindi usare l'analogo metodo di MultipartRequest
String fileName = mpRequest.getFilesystemName("upload_file");
System.out.println("fileName is " + fileName);
File file; //creo un oggetto di tipo "file" dal file nella cartella temporanea
file = mpRequest.getFile("C:\\app");
//String fileName = file.getName();
//Connection;
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@"+hostname+ ":"+ port +":"+ sid , username , password);
con.setAutoCommit(false);// we must control the commit SE METTO TRUE FUNZIONA MA DA UN ALTRO ERRORE;
insertBLOB(fileName, file, con);//passo il nome del file e l'oggetto file
return (bAttachOk && bParamsOk);
public void insertBLOB(String strFileName, File AttachedFile, Connection connection) throws SQLException, Exception
long ts1 = System.currentTimeMillis();
ResultSet rs = null;
Statement stmt = null;
//Create a statement.
StringBuffer sbSql = new StringBuffer();
sbSql.append("INSERT INTO media\n");
sbSql.append("(file_name, file_content)\n");
sbSql.append("values ('" + strFileName + "', empty_blob())");
connection.setAutoCommit(false);
stmt = connection.createStatement();
stmt.execute(sbSql.toString());
System.out.println(sbSql);
//Take back the record for update (we will insert the blob)
StringBuffer sbSqlBody = new StringBuffer();
sbSqlBody.append("SELECT file_content FROM media\n");
sbSqlBody.append("WHERE file_name = '" + strFileName + "' for update");
//Execute the query, and we must have one record so take it
rs = stmt.executeQuery(sbSqlBody.toString());
rs.next();
System.out.println(sbSqlBody);
//Use the OracleDriver resultset, we take the blob locator
BLOB blob = ((OracleResultSet)(rs)).getBLOB("file_content");
//copyFileIntoBlob(AttachedFile, blob);
System.out.println("Start copyFileIntoBlob");
System.out.println("attached length = " + AttachedFile.length()); <-GOT THE ERROR HERE
FileInputStream instream = new FileInputStream(AttachedFile);
System.out.println("before getBinaryOutputStream");
OutputStream outstream = blob.getBinaryOutputStream();
System.out.println("after getBinaryOutputStream");
//Call getChunkSize() to determine the ideal chunk size to write to the BLOB,
//then create the buffer byte array.
int chunk = blob.getChunkSize();
byte[] buffer = new byte[chunk];
int length = -1;
while ((length = instream.read(buffer)) != -1)
outstream.write(buffer, 0, length);
instream.close();
outstream.close();
System.out.println("End copyFileIntoBlob");
long ts2 = System.currentTimeMillis();
connection.commit();
connection.close();
//cancella il file
AttachedFile.delete();
//cancella il file
System.out.println("\n"+ (ts2 - ts1) +" ms" );
******************************************************You are getting NullPointerException because the input parameter AttachedFile to the function
public void insertBLOB(String strFileName, File AttachedFile, Connection connection)is null.
First check if the file object is null here: before passing it on to the function.
File file; //creo un oggetto di tipo "file" dal file nella cartella temporanea
file = mpRequest.getFile("C:\\app");I don't think file = mpRequest.getFile("C:\\app"); will work if
app is just a directory, try specifying a file name there.
Message was edited by:
appy77 -
NullPointerException at oracle.sql.BLOB.createTemporary(BLOB.java:590)
Hi,
I seldom use the BLOB. Here is the coding that creates a BLOB.
private BLOB getBlob(byte[] str, Connection con) throws SQLException, IOException {
BLOB blob = BLOB.createTemporary(con, true, BLOB.DURATION_SESSION);
blob.open(BLOB.MODE_READWRITE);
OutputStream writer = blob.getBinaryOutputStream();
writer.write(str);
writer.flush();
writer.close();
blob.close();
return blob;
After inserting this BLOB into database table via ojdbc, BLOB.freeTemporary() is called.
BLOB blob = getBlob(compressedClaim,connStore);
rsImagePstmt.setObject(4,blob);
rsImagePstmt.executeUpdate();
BLOB.freeTemporary( blob );
Sometimes it's running ok and finished properly. Sometimes I got the following exception after running 2.5 hours.
Thanks a lot for any suggestion and help. We use oracle 10.2 and java1.4 library here.
> Exception: java.lang.NullPointerException
> at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:669)
> at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:602)
> at oracle.jdbc.driver.T2CConnection.createTemporaryBlob(T2CConnection.java:2039)
> at oracle.sql.BLOB.createTemporary(BLOB.java:590)
If I ran in the debug mode, I got the following errors after 2.5 hours:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x62F0BCF4
Function=Java_oracle_jdbc_driver_T2CStatement_t2cFetchDmlReturnParams+0x594
Library=C:\oracle\product\10.2.0\client\BIN\ocijdbc10.dll
Current Java thread:
at oracle.jdbc.driver.T2CConnection.lobCreateTemporary(Native Method)
at oracle.jdbc.driver.T2CConnection.createTemporaryBlob(T2CConnection.java:2039)
at oracle.sql.BLOB.createTemporary(BLOB.java:590)
at com.viant.consumer.impl.RateSheetConsumer.getBlob(RateSheetConsumer.java:386)
at com.viant.consumer.impl.RateSheetConsumer.finishRateSheet(RateSheetConsumer.java:293)
at com.viant.consumer.impl.RateSheetConsumer.run(RateSheetConsumer.java:156)
at java.lang.Thread.run(Thread.java:534)
Dynamic libraries:
0x00400000 - 0x0040B000 C:\jdk1.4\bin\javaw.exe
0x77220000 - 0x7735C000 C:\Windows\SYSTEM32\ntdll.dll
0x76CE0000 - 0x76DB4000 C:\Windows\system32\kernel32.dll
0x75620000 - 0x7566B000 C:\Windows\system32\KERNELBASE.dll
0x758D0000 - 0x75970000 C:\Windows\system32\ADVAPI32.dll
0x75C10000 - 0x75CBC000 C:\Windows\system32\msvcrt.dll
0x75B20000 - 0x75B39000 C:\Windows\SYSTEM32\sechost.dll
0x77170000 - 0x77211000 C:\Windows\system32\RPCRT4.dll
0x75B40000 - 0x75C09000 C:\Windows\system32\USER32.dll
0x75D50000 - 0x75D9E000 C:\Windows\system32\GDI32.dll
0x77440000 - 0x7744A000 C:\Windows\system32\LPK.dll
0x76F90000 - 0x7702D000 C:\Windows\system32\USP10.dll
0x77360000 - 0x7737F000 C:\Windows\system32\IMM32.DLL
0x75A00000 - 0x75ACC000 C:\Windows\system32\MSCTF.dll
0x62A20000 - 0x62A2C000 C:\PROGRA~1\NETINST\NIAMH.DLL
0x75330000 - 0x75368000 C:\PROGRA~1\SOPHOS\SOPHOS~1\SOPHOS~1.DLL
0x77420000 - 0x77425000 C:\Windows\system32\PSAPI.DLL
0x752B0000 - 0x752C5000 C:\Windows\system32\AMINIT32.DLL
0x08000000 - 0x08139000 C:\jdk1.4\jre\bin\client\jvm.dll
0x73510000 - 0x73542000 C:\Windows\system32\WINMM.dll
0x75210000 - 0x7525C000 C:\Windows\system32\apphelp.dll
0x10000000 - 0x10007000 C:\jdk1.4\jre\bin\hpi.dll
0x00270000 - 0x0027E000 C:\jdk1.4\jre\bin\verify.dll
0x00280000 - 0x00299000 C:\jdk1.4\jre\bin\java.dll
0x002A0000 - 0x002AD000 C:\jdk1.4\jre\bin\zip.dll
0x003D0000 - 0x003EC000 C:\jdk1.4\jre\bin\jdwp.dll
0x002B0000 - 0x002B5000 C:\jdk1.4\jre\bin\dt_socket.dll
0x773E0000 - 0x77415000 C:\Windows\system32\ws2_32.dll
0x75970000 - 0x75976000 C:\Windows\system32\NSI.dll
0x736D0000 - 0x736E0000 C:\Windows\system32\NLAapi.dll
0x71BE0000 - 0x71BF0000 C:\Windows\system32\napinsp.dll
0x71BA0000 - 0x71BB2000 C:\Windows\system32\pnrpnsp.dll
0x74D50000 - 0x74D8C000 C:\Windows\System32\mswsock.dll
0x74C10000 - 0x74C54000 C:\Windows\system32\DNSAPI.dll
0x71BF0000 - 0x71BF8000 C:\Windows\System32\winrnr.dll
0x71C30000 - 0x71C57000 C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLIDNSP.DLL
0x75DA0000 - 0x75DF7000 C:\Windows\system32\SHLWAPI.dll
0x74370000 - 0x7438C000 C:\Windows\system32\IPHLPAPI.DLL
0x74820000 - 0x74827000 C:\Windows\system32\WINNSI.DLL
0x721E0000 - 0x72218000 C:\Windows\System32\fwpuclnt.dll
0x71C20000 - 0x71C26000 C:\Windows\system32\rasadhlp.dll
0x74840000 - 0x74857000 C:\ProgramData\Sophos\Web Intelligence\swi_ifslsp.dll
0x74830000 - 0x74839000 C:\Windows\system32\VERSION.dll
0x76090000 - 0x76CDB000 C:\Windows\system32\SHELL32.dll
0x74810000 - 0x74815000 C:\Windows\System32\wshtcpip.dll
0x01240000 - 0x0124F000 C:\jdk1.4\jre\bin\net.dll
0x62F00000 - 0x62F13000 C:\oracle\product\10.2.0\client\BIN\ocijdbc10.dll
0x08450000 - 0x084A9000 C:\oracle\product\10.2.0\client\bin\OCI.dll
0x7C340000 - 0x7C396000 C:\Windows\system32\MSVCR71.dll
0x61C20000 - 0x61E77000 C:\oracle\product\10.2.0\client\bin\OraClient10.Dll
0x60870000 - 0x60956000 C:\oracle\product\10.2.0\client\bin\oracore10.dll
0x60A80000 - 0x60B47000 C:\oracle\product\10.2.0\client\bin\oranls10.dll
0x63690000 - 0x636A8000 C:\oracle\product\10.2.0\client\bin\oraunls10.dll
0x60EB0000 - 0x60EB7000 C:\oracle\product\10.2.0\client\bin\orauts.dll
0x75770000 - 0x758CC000 C:\Windows\system32\ole32.dll
0x636B0000 - 0x636B6000 C:\oracle\product\10.2.0\client\bin\oravsn10.dll
0x60FA0000 - 0x61098000 C:\oracle\product\10.2.0\client\bin\oracommon10.dll
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0x60960000 - 0x60A77000 C:\oracle\product\10.2.0\client\bin\oran10.dll
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0x09340000 - 0x096B5000 C:\oracle\product\10.2.0\client\bin\orapls10.dll
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0x74BE0000 - 0x74C02000 C:\Windows\system32\LOGONCLI.DLL
0x62980000 - 0x62991000 C:\oracle\product\10.2.0\client\bin\orantcp10.dll
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0x09B80000 - 0x09C92000 C:\jdk1.4\jre\bin\awt.dll
0x72870000 - 0x728C1000 C:\Windows\system32\WINSPOOL.DRV
0x09810000 - 0x09861000 C:\jdk1.4\jre\bin\fontmanager.dll
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0x73AA0000 - 0x73AA6000 C:\Windows\system32\DCIMAN32.dll
0x76DF0000 - 0x76F8D000 C:\Windows\system32\SETUPAPI.dll
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0x0AF10000 - 0x0B3E1000 C:\Windows\system32\igdumd32.dll
0x742C0000 - 0x742E5000 C:\Windows\system32\PowrProf.dll
0x66150000 - 0x6621C000 C:\Windows\system32\D3DIM700.DLL
0x76DC0000 - 0x76DEA000 C:\Windows\system32\imagehlp.dll
0x70BF0000 - 0x70CDB000 C:\Windows\system32\dbghelp.dll
Heap at VM Abort:
Heap
def new generation total 4608K, used 291K [0x10010000, 0x10510000, 0x12770000)
eden space 4096K, 5% used [0x10010000, 0x10046aa0, 0x10410000)
from space 512K, 14% used [0x10490000, 0x104a2208, 0x10510000)
to space 512K, 0% used [0x10410000, 0x10410000, 0x10490000)
tenured generation total 60544K, used 56437K [0x12770000, 0x16290000, 0x30010000)
the space 60544K, 93% used [0x12770000, 0x15e8d4b8, 0x15e8d600, 0x16290000)
compacting perm gen total 12800K, used 12682K [0x30010000, 0x30c90000, 0x34010000)
the space 12800K, 99% used [0x30010000, 0x30c72900, 0x30c72a00, 0x30c90000)
Local Time = Thu Oct 17 11:29:35 2013
Elapsed Time = 9003
# The exception above was detected in native code outside the VMHi!
It seems you can do this:
try {
conn = new OracleDriver().defaultConnection(); graphblob = oracle.sql.BLOB.createTemporary(conn, false,oracle.sql.BLOB.DURATION_CALL); // must init
System.out.println("Blob is init");
} catch ( java.sql.SQLException sEx ) {
throw new RuntimeException ("No connection", sEx);
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:1285601748584
http://www.unix.org.ua/orelly/oracle/guide8i/ch09_08.htm
/Bjoern -
How to convert oracle BLOB to String
Hi,
I am working on an GIS project using Oracle database which stores the spatial data. When I read the polygon points data which is saved as BLOB type in database table and convert the BLOB to byte[], there is no problem. However when the data is converted to Character, those characters are not recognized something like this:
�����������?�����?���w�����������������!����?o����s��8��n�����H��?
������������������ �?&�?�����|��?��������?���������������L�?
This is the method I used to convert BLOB to String below:
-----mapb is the BLOB instance.
byte[] images = mapb.getBytes(1,(int)mapb.length());
String newstring = new String(images);
Is that decoding problem?
Can somebody help me for this problem?
Thanks in advance!
XRHi,
Thanks for reply,
Actually the data is ESRI spatial data saved in ORACLE database.
the BLOB is not a column, it is part of column of st_geometry.
I looked at some docs in ESRI, they save points which is the last part of st_geometry field with BLOB type. I use the jdbc to get the geometry data and use STRUCT and Datum class to get all members of the st_geometry data. There are 14 members in the field, I can cast most of them into String through Datum instance, but the object #14 is BLOB, will not allow me cast it to String directly, so I use byte[] and cast it though new String().
some of the lines here:
STRUCT st = (oracle.sql.STRUCT) rs.getObject("shape");
Datum[] dtms = st.getOracleAttributes();
BLOB mapb = null;
for (int i=0;i<dtms.length;i++){
if (!(dtms[i] == null)){
if (i==13){
mapb = (BLOB)dtms;
} else {
log.info("data" + i + "=" + dtms[i].stringValue());
byte[] images = mapb.getBytes(1,(int)mapb.length());
String newstring = new String(images);
Thanks again for your reply.
XR -
Self Service Restore - Data Centre Failure
I'm evaluating the new 'Standard' tier of SQL database and self service restore feature. My question is about where the backups are stored for self service restore and whether they help in a full data centre failure. e.g. If my Standard SQL db is in Europe
West and the only backup I am using is the in built self service restore. Do I have any protection if Europe West has a major DR event? Or do I still need to export the databases to blob storage to handle this kind of event? (Whereby I would need to restore
to Europe North manually)As indicated in the "Service Tiers Details" table in this
blog posting , we have a couple of new features which are not yet enabled for the new tiers.
One feature will be the ability to restore a database to an alternate datacenter in case the primary data center you are using is not available OR for any other reason you may want to restore a database in an alternate location. This recovery option
uses geo-replicated backups. For this feature we only geo-replicate the full and daily backups but not the log backups so point-in-time restore is not possible but you will have an RPO of less than 24-hours. Think of this as always having access
to daily off-site backups from any location. This feature will be available for Basic, Standard and Premium.
The second feature which we will enable later is the geo-replication for Standard. This feature will allow you to opt-in for geo-replicating your Standard database to a passive secondary in an alternate location. We will have more details about
this feature in a few weeks.
Until you have access to one of the above two features you will have to use the export-to-blob for the datacenter failure case. We are working hard to deliver the above two features as soon as we can.
I hope this helps.
Tonyp
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