Serving webpage with image stored in database

This may look long, but it's easy to understand--I'm just trying to give all the details you might want: In our servlet/JSP site, a user can generate a report that may or may not contain images. The servlet just sends the user to a regular HTML page. The HTML file and images it may have are stored in directories on the Tomcat server. But now we have a problem...
We're moving to 2 standalone Tomcat machines with a load balancer in front, and so now we want to move any of this stuff that was stored on the webserver into the database. If the HTML text for the report has not yet been generated for that day, I can see my web app going to the database to pull out that HTML, and if there are any images, it could pull those out of the database, but then...how does it get those to the user's web browser?
Currently, when this report loads in the browser, we do a sendRedirect to the file, and the URL displays the full path to the file (and in the HTML code, there is of course a relative link to the image file). But now, these are supposed to be pulled out of the database...are we going to have to pull them out of the database and then write them out to file on the webserver (since they might not exist on that webserver), or is there some other/better way to display them to the user?
Thanks...

You can create an Image Servlet that you use to stream the image streight from the db to the page. The URLs that you use in the HTML pages would point to this Servlet with a parameter identifying the image (or you could map the Servlet to *.gif for example). The servlet then sets the content type to the appropriate image format, retrieves the image from the DB as a Stream and copies it byte for byte to the response output stream.
If you search the forums you will probably find an example of how to do this.

Similar Messages

Displaying Images stored in Database

Hi, all i am having images stored in Databases as BLOB.
how i can display that in flex application. suppose i am having the ArrayList of Employees in which employee object also have a field of called empImage, how i can display this data in flex.
i am using BlazeDS.
Thanks
Regards
Amar Deep Singh

Hi,
This will give you the idea of getting the image from you array list.
http://blog.flexexamples.com/2008/02/15/creating-a-simple-image-gallery-with-the-flex-hori zontallist-control/
Johnny
Please rate my answer. Tks

Getting image stored in database !!

Hey !!
I'm really trying to solve so much problems i'm having with javafx !!
So, like the title may suggest, i'm having problems as to get image from the database !!
Everything seems fine but it tells me that there is "Exception while runing Application"
here is the code !!
@James D, i will come back bugging yu again to see how to use the stored images and display them inside the combobox and to render them ^^
I haven't well understand how well as to use the enum struc in which yu declared the composed <Image,String> type ^^
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javax.swing.JOptionPane;
* @author Minedun6
public class DynamicCustomComboBox extends Application {
    Connection c = connection.ConnecrDb();
   PreparedStatement pst = null;
   ResultSet rs = null;
   ComboBox box1;
   ImageView view;
    @Override
    public void start(Stage primaryStage) {
        box1 = new ComboBox();
        box1.setPrefSize(100, 25);
        box1.setOnShowing(new EventHandler() {
            @Override
            public void handle(Event t) {
                box1.getItems().clear();
                try {
            String sql = "select libelle_constr,img_constructeur from constructeurs where libelle_constr='Citroen';";
            pst = c.prepareStatement(sql);
            rs = pst.executeQuery();
           while(rs.next()){
               box1.getItems().add(rs.getString("libelle_constr"));
               InputStream input = new ByteArrayInputStream(rs.getBytes("img_constructeur"));
               Image imge = new Image(input);
               view.setImage(imge);
        } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
        StackPane root = new StackPane();
        root.getChildren().addAll(box1);
        Scene scene = new Scene(root, 300, 250);
        primaryStage.setTitle("Hello World!");
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        primaryStage.show();
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        launch(args);
}

In any real application, it's a mistake to mix your presentation (user interface) code with your persistance (database access) code.
Why? You want maintainability, flexibility, and testability.
Maintainability:
Suppose you want to change the structure of your database. E.g. the database admin (which may be you, or someone else) determines that the database design you have is inefficient and needs to be changed. If your database code is scattered over the whole application, mixed in among your user interface code, tracking down what needs to be changed will be a nightmare. If all your database code is in a single class, or perhaps a set of classes in a single package, then the updates are localized and much easier to manage. Furthermore, you can build the new database access code on its own, test it out, and then when you are sure it works just switch your user interface code to use the new persistance layer instead of the old one. The same applies if you decide you're going to use a completely different technology to store the data; perhaps you want to use something like Hibernate instead of plain JDBC, or maybe you decide you want to make the data accessibile via a web service.
Flexibility:
What if you (or, more likely, your manager) decides they're going to change to a new user interface technology. Maybe they decide to switch to a web application (i.e. HTML-based) instead of a desktop application. You obviously need to rewrite the user interface code, but you should be able to keep all the database access code you've written. If your database access code is all jumbled up with the user interface code you're replacing, it's going to be way harder to reuse that code. If the two are separated out, you just build a new user interface in whatever new technology you're using, and access the same class(es) you used for your database access without touching them.
Testability:
This whole thread is actually a demo of how testability is much harder if you don't properly separate your code. You posted "getting image stored in database", thinking that was your problem. It wasn't; your problem was actually an error in the way you'd set up your JavaFX code. Because the two were completely mixed together, it was hard to know where the error was. The error you had was actually a really simple one; it would have been much easier to see if you had simpler, properly separated code; but because you didn't organize your code like that it took you days to figure out the problem. This was only a couple of dozen lines of code; imagine how this looks in a real application with hundreds or thousands of classes.
The point is that decisions about how to access your data (standalone database, web service, or EJB?; plain JDBC, JPA, Hibernate, etc?) , and decisions about the presentation technology (desktop or web? JavaFX or Swing?, or Servlets/JSPs, JSF, Swing MVC, or any of a huge number of frameworks) are completely independent. You should be in a position to change those decisions - to redesign aspects of the application - with the least amount of effort possible. Failing to properly design things will make this much harder, or likely completely impossible.
These are real concerns that affect every application that goes into production.
Even if you're just making a small application, it will benefit you to set things up correctly from the outset.

How do I merge data from table1 on server 1 to final table on server 2 with a stored procedure to execute every so many hours.

How do I merge data from table1 on server 1 to final table on server 2 with a stored procedure to execute every so
many hours.

How big is the table on server B? Is that possible to bring the all data into a server A and merge the data locally?
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
SQL Server Integration Services:
Business Intelligence

How do I merge data from table1 on server 1 to final table on server 2 with a stored procedure to execute every 4 hours.

How do I merge data from table1 on server 1 to final table on server 2 with a stored procedure to execute every so many hours.

Hello,
If you had configure server2 as
linked server on the server1, you can run the following statement inside stored proceduce to copy table data. And then create a job to the run stored proceduce every 4 hours.
Insert Into Server2.Database2.dbo.Table2
(Cols)
Select Cols From Server1.Database1.dbo.Table1
Or you can use the SQL Server Import and Export Wizard to export the data from server1 to server2, save the SSIS package created by the wizard on the SQL Server, create a job to run the SSIS package.
Reference:http://technet.microsoft.com/en-us/library/ms141209.aspx
Regards,
Fanny Liu
Fanny Liu
TechNet Community Support

How to deal with images stored in oracle

hi,
can anyone help me to solve this issue please:
in fact i am developping a swing based standalone application based on a TCP/IP client-server connection, so the point is to display on my frame for each student his information and also his personal picture
first step : storing the personal picture into the oracle database from a specefic frame that allows to specify each NEW student's profile and his photo.
step 2: as needed, a specefic frame allows to retrieve all the information related to a student and his photo to ( in a jlabel or other swing componenet)
how to deal with this storing and then the retriving from the oracle DB
any help please!

If I understand well your problem, you need your client java application to store and retrive information from an oracle DB.
This can be done via JDBC.
Here's the tutorial:
http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/JDBC20.html
Look at
http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/JDBC20.html#JDBC2018
for storing and retriving binary data (like java serialized objects (Images for example))

Please could anybody has a sol, to bring images to the report for all employees which has no reference with images stored in some path

Hi Obiee experts,
I have placed the images in below locations and these images are independent and has no reference to the employee id column in dimension table.but my client requires report with all the employees,with respect to the images.Could anybody can give me a solution for this.
    1) root: \apps\Middleware\user_projects\domains\bifoundation_domain\servers\bi_server1\tmp\_WL_user\analytics_11.1.1\7dezjl\war\res\s_blafp\images
   2) root: \apps\Middleware\Oracle_BI1\bifoundation\web\app\res\s_blafp\images
   3) root: \apps\Middleware\instances\instance1\bifoundation\OracleBIPresentationServicesComponent\coreapplication_obips1\analyticsRes
Thanks in Advance
kumar

Hi Sreeni,
The images are stored with employee ids reference like 1234.jpg in the image location path, so will it be possible to call those images into the report with no relation at database level.
as you said in above mail even if if we cld try to store the images in oracle database with format like CLOB format the rpd will not support the datatype to bring to that report level.
Please let me know if you have any solution
Thanks in Advance
kumar

How to Display RTF data with images from SQL database in Crystal Report

I am using Crystal report in my WPF application, I have generate Question Paper Report, in which have Question with images. Question with images are stored in SQL Server in rtf format, I want to generate Question report with RTF Text and Images in report

Hello Sir,
I am still Facing problem in Crystal report generation with RTF Data (Text + Images),
I am storing Questions in SQL Server which are RTF Format, Questions have Text + Images..
I changed field data type then also i didn't get image in Crystal report
if i browse an image n stored that in DB then its displaying in Crystal report, but when i pasted that image in RichTextBox and saved that in DB then no data displayed in Crystal report.
My Table Structure is
Table Name: tblQuestions
field : Questions Varbinary(max)
I tried with nvarchar(max) also but its aslo not working

Issues with Image rendering from Database

Maestros,
I have an issue here that I working but can hardly find a plausible solution and would like some help from the community. I'll do my best to explain the my issue in detail that way those of you who are savvy in this domain can jump on it right away.
I am in the process of implementing a shopping grid where products are shown as items on the grid. Each grid contains a custom product tag that contains a product image thumbnail, the description and price. All picture images are stored in a postgres sql database as byte arrays. I retrieve and rendered them on the product grid using a servlet that calls my product service.
The problem I am having is that when products are rendered not all the images are rendered even though they are present. One a refresh is done, some of the ones that previously did not render on renders and some that did go missing. I am using jsf and it looks like the application reaches the render response phase before the images are completely retrieved. I am also implement hibernate ehcache to see if that can help solve the problem, to no avail.
Is my approach the right approach? I know some of you would want to ask why I save images in a database and if you really want to know, the reason is because products are loaded dynamically and one product can have as many images as the e-shop manager wants. If please have another way to solve this problem please feel free to let me know. I am sure there is a better way of retrieving those images and render them without any issues and if you have done anything like that before feel free to send me some directions.
Thanks
Edited by: user10444142 on Oct 7, 2010 5:55 AM

Intermittent problems are often a result of interference. Interference can be caused by other networks in the neighbourhood or from household electrical items.
You can download and install iStumbler (NetStumbler for windows users) to help you see which channels are used by neighbouring networks so that you can avoid them, but iStumbler will not see household items.
Refer to your router manual for instructions on changing your wifi channel or adjusting your multicast rate.
There are other types of problems that can affect networks, but this is by far the most common, hence worth mentioning first. Networks that have inherent issues can be seen to work differently with different versions of the same software. You might also try moving the Apple TV away from other electrical equipment.

Pdf printing of an image stored in database?

Hi,
I am using pdf printing option, but stuck in a case where I need to retrieve a image from the database table stored as a blob content.
Is it possible to create a report review of this sort?
Is this even possible?
Thanks..

Hello,
Yes, absolutely.
Check out this blog post by Marc Sewtz on how to do it -
http://marcsewtz.blogspot.com/2008/06/one-question-about-pdf-printing-feature.html
Hope this helps,
John.
Blog: http://jes.blogs.shellprompt.net
Work: http://www.apex-evangelists.com
Author of Pro Application Express: http://tinyurl.com/3gu7cd
REWARDS: Please remember to mark helpful or correct posts on the forum, not just for my answers but for everyone!

Showing Image Stored In DataBase

Hello Friends,
I have images stored in MySQL database. In a blob field. In a desktop application i have used
blob b=rs.getBlob("Picture");
byte[] buf=b.getBytes((long)1,(int)b.length());
ImageIcon imgIcon= new ImageIcon(buf);
Image img=imgIcon.getImage();
Graphics g=image.getGraphics();
g.drawImage(img,0,0,320,240,image);
the thing worked fine. But now i have to show images over web. I am not able to uderstand that how to show images. As i m unable to get Graphics from any of the component.
Help Me,
Its urgent,
thanking u all
Abhilash Jain

The common method to include binary information (image, PDF, document, etc) is to Base64 encode the file and store the resulting character string in the XML. It would be up to the receiving system to handle the encoded information in the XML.

Client Server Application with images or icons

I made a Client Server application with JFrames, but I put a jLabel with an icon, and I can't run the Client.
It says java.lang.NullPointerException
Do you know why I can't see the icon in the JLabel? It isn't an applet, it's an application with JFrames.

You have to explain the problem better if you want some help. Also show the code which is giving you the nullpointerexception(Do not forget codetags!).

Radio Button group with images stored as BLOB files in database

Hey all!
I have radio button group, my idea is that radio button's LOV must display images, I mean BLOB files stored in a table.
How can I do this?

Hello Ken,
I asked similar question in the past, and I believe the answer is still the same.
Select List as an option of a Radio Group
In your case, I think you can use a select list with added functionality, like "Select List with Branch to Page" or "Select list with Submit", or you can just attach an onChange event (JavaScript) to each select list. The effect should be similar to a radio group as soon as the user select one item from any of the select lists, you can fire some action, based on the select list value.
Hope this can help,
Arie.

Trying to report bug in SQL Server Replication with sp_MSdetect_nonlogged_shutdown stored procedure

I've just tried to "Submit Feedback" but the page just gives me an error which means nothing to anyone which says "You are not authorized to submit the feedback for this connection.". Why am I not authorised how do I become authorised etc
etc. Anyway :-)
I've trying to report that the stored procedure in Sql Server Replication in 12.0.2000 has an issue with data type lengths. This procedure sp_MSdetect_nonlogged_shutdown uses data lengths of nvarchar(2048) but the MSDB sysjobhistory table has a message field
length of 4000. Which causes the above stored procedure to crash.
Best Regards
Richard

This is the work around
1. Stop SQL Server service.
2. On command prompt run the following command to run the server in single user mode – be sure to replace the MSSQLSERVER with the actual instance name
C:\>”C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Binn\sqlservr.exe” -sMSSQLSERVER -m
3. Connect to SQL server with SSMS as the server administrator
4. Run the following to change the database to the system resource database: “USE mssqlsystemresource”
5. Run the following to update the stored procedure (only change is to make NVARCHAR(4000))
SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER OFF
GO
ALTER procedure [sys].[sp_MSdetect_nonlogged_shutdown]
@subsystem nvarchar(60),
@agent_id int
as
begin
declare @job_id binary(16)
declare @agent_name sysname
declare @message nvarchar(4000)
declare @retcode int
declare @runstatus int
declare @run_date int
declare @run_time int
declare @run_date_orig int
declare @run_time_orig int
declare @merge_session_id int
-- security check
-- only db_owner can execute this
if (is_member ('db_owner') != 1)
begin
raiserror(14260, 16, -1)
return (1)
end
-- Detect if the agent was shutdown without a logged reason
if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'SNAPSHOT'
begin
if exists (select runstatus from MSsnapshot_history where
agent_id = @agent_id and
runstatus <> 2 and
--CAC runstatus <> 5 and
runstatus <> 6 and
timestamp = (select max(timestamp) from MSsnapshot_history where agent_id = @agent_id))
begin
select @job_id = job_id, @agent_name = name from MSsnapshot_agents where id = @agent_id
end
end
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'LOGREADER'
begin
if exists (select runstatus from MSlogreader_history where
agent_id = @agent_id and
runstatus <> 2 and
--CAC runstatus <> 5 and
runstatus <> 6 and
timestamp = (select max(timestamp) from MSlogreader_history where agent_id = @agent_id))
begin
select @job_id = job_id, @agent_name = name from MSlogreader_agents where id = @agent_id
end
end
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'DISTRIBUTION'
begin
if exists (select runstatus from MSdistribution_history where
agent_id = @agent_id and
runstatus <> 2 and
--CAC runstatus <> 5 and
runstatus <> 6 and
timestamp = (select max(timestamp) from MSdistribution_history where agent_id = @agent_id))
begin
select @job_id = job_id, @agent_name = name from MSdistribution_agents where id = @agent_id
end
end
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'MERGE'
begin
if exists (select runstatus from dbo.MSmerge_sessions where
agent_id = @agent_id and
runstatus <> 2 and
--CAC runstatus <> 5 and
runstatus <> 6 and
session_id = (select top 1 session_id from dbo.MSmerge_sessions where agent_id = @agent_id order by session_id desc))
begin
select @job_id = job_id, @agent_name = name from dbo.MSmerge_agents where id = @agent_id
select top 1 @merge_session_id = session_id from dbo.MSmerge_sessions
where agent_id = @agent_id
order by session_id desc
end
end
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'QUEUEREADER'
begin
if exists (select runstatus from MSqreader_history where
agent_id = @agent_id and
runstatus <> 2 and
--CAC runstatus <> 5 and
runstatus <> 6 and
timestamp = (select max(timestamp) from MSqreader_history where agent_id = @agent_id))
begin
select @job_id = job_id, @agent_name = name from MSqreader_agents where id = @agent_id
end
end
-- If no job_id assume shutdown was logged properly
if @job_id is null
return 0
-- Get last message from SQL Agent History table
create table #JobHistory (
instance_id int NOT NULL,
job_id uniqueidentifier NOT NULL,
job_name sysname NOT NULL,
step_id int NOT NULL,
step_name nvarchar(100) NOT NULL,
sql_message_id int NOT NULL,
sql_severity int NOT NULL,
message nvarchar(4000) NOT NULL,
run_status int NOT NULL,
run_date int NOT NULL,
run_time int NOT NULL,
run_duration int NOT NULL,
operator_emailed sysname NULL,
operator_netsent sysname NULL,
operator_paged sysname NULL,
retries_attempted int NOT NULL,
server sysname NOT NULL
if @@error <> 0
return 1
-- Insert last history for step_id 2 (Agent running)
insert TOP(2) into #JobHistory exec sys.sp_MSreplhelp_jobhistory @job_id = @job_id, @step_id = 2,
@mode = 'FULL'
declare cursorHistory cursor local fast_forward for
select message,
run_status,
run_date,
run_time
from #JobHistory
order by run_date desc,
run_time desc,
instance_id asc
open cursorHistory
fetch cursorHistory into @message, @runstatus, @run_date, @run_time
select @run_date_orig = @run_date,
@run_time_orig = @run_time
while @@fetch_status <> -1
begin
-- as long as we are looking at the history for the same run
-- date and time then we should log all rows. there should
-- be 2 rows since we perform a TOP on exec sp_help_jobhistory
if @run_date_orig = @run_date
and @run_time_orig = @run_time
begin
-- Map SQL Agent runstatus to Replication runstatus
set @runstatus =
case @runstatus
when 0 then 6 -- Fail mapping
when 1 then 2 -- Success mapping
when 2 then 5 -- Retry mapping
when 3 then 2 -- Shutdown mapping
when 4 then 3 -- Inprogress mapping
when 5 then 0 -- Unknown is mapped to never run
end
-- If no message, provide a default message
-- Also overwrite all inprogress messages to be "See SQL Agent history log".
-- This is to prevent "Agent running. See monitor" to be logged into repl monitor.
-- In this case (the last job history message is InProgress), we know that
-- there have been failures of SQL Server Agent history logging.
-- In fact, the only possible "in progress" msg in SQL Agent job step
-- history for push jobs is "Agent running. See monitor". It is confusing that those
-- messages showed up in repl monitor.
if @message is null or @runstatus = 3
begin
raiserror(20557, 10, -1, @agent_name)
select @message = formatmessage(20557, @agent_name)
end
if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'SNAPSHOT'
exec @retcode = sys.sp_MSadd_snapshot_history @agent_id = @agent_id, @runstatus = @runstatus,
@comments = @message
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'LOGREADER'
exec @retcode = sys.sp_MSadd_logreader_history @agent_id = @agent_id, @runstatus = @runstatus,
@comments = @message
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'DISTRIBUTION'
exec @retcode = sys.sp_MSadd_distribution_history @agent_id = @agent_id, @runstatus = @runstatus,
@comments = @message
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'MERGE'
exec @retcode = sys.sp_MSadd_merge_history @agent_id = @agent_id, @runstatus = @runstatus,
@comments = @message, @called_by_nonlogged_shutdown_detection_agent = 1, @session_id_override = @merge_session_id
else if UPPER(@subsystem collate SQL_Latin1_General_CP1_CS_AS) = 'QUEUEREADER'
exec @retcode = sys.sp_MSadd_qreader_history @agent_id = @agent_id, @runstatus = @runstatus,
@comments = @message
if @@error <> 0 or @retcode <> 0
return 1
end
fetch cursorHistory into @message, @runstatus, @run_date, @run_time
end
close cursorHistory
deallocate cursorHistory
drop table #JobHistory
end
6. Return the system resource database to read-only – “alter database mssqlsystemresource set read_only”
7. Shutdown the instance – “shutdown”
8. Start the instance using the service as usual

APEX 5.0. Report with image stored in a BLOB gives ORA-06502.

Hi,
I want to create an Interactive Report - Desktop with an image in which is stored in a BLOB but it returnes a: ORA-06502: PL/SQL: numeric or value error: character to number conversion error.
I have created a test report with only the image (billed - which is a BLOB) and an ID (the PK - a number from a sequence)
select ID, billed from foto
I have tried with and without a formatmask for the ID '999999999999999' and the Type as Plain text as there seems not to be a better choice..
For the 'billed' Type is 'Display Image' and the 'Table Name' and 'BLOB Column' are set. 'Primary Key Column 1' is set to ID. 'Mime Type Colomn' points to a field that contains 'image/jpeg' as the stored image is a photo in jpg.
The image displays OK from a Forms application.
DB is a 11.2.0.4 on Linux 6.6 and APEX is 5.0
What have I missed?
Thanks,
Dino

Dino Hustinx wrote:
I want to create an Interactive Report - Desktop with an image in which is stored in a BLOB but it returnes a: ORA-06502: PL/SQL: numeric or value error: character to number conversion error.
I have created a test report with only the image (billed - which is a BLOB) and an ID (the PK - a number from a sequence)
select ID, billed from foto
As described in the documentation, the report query must select the length of the BLOB column, not the column itself:
select id, dbms_lob.get_length(billed) billed from foto

Serving webpage with image stored in database

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