Connecting an applet to database

Hello Everybody,
I have a problem of connecting the applet to the database through a separate java class.
to be more clear i have a applet which uses a java class file for databse conenction.
the error i'm facing while doing this is that java.net.socket permission.
my database is oracle and i'm using thin driver to establish the connection.
now i have the doubt that is it the right kind of approach.
i mean can i connect the applet to the database through a normal java class.
i hope some can get me the solution.
thanking u in advance
regards
RaviTeja

I suppose your problem is that you get a Security Exception when your applet try to open a JDBC connection to a database located on another server, right?
To solve the problem, you have to sign your applet with a digital signature or bring the webserver and the database on the same machine.
(Concerning the digital signatures, look in the forums, and you will find tons of messages about it)

Similar Messages

Applet + remote database + newbie

Hi,
Tired of microsoft randomly dumping the market making me rewrite applications each time they publish updated os,language etc...i finally (and really happily) surrender to java....
Here is my point : i'd like to create applet-based application that will retrieve-update from/to remote server, (access database for instance)...am i pointing the worng direction or does it seem a good choice.
Is it necessary to use servlets ? (all i've seen about applet-servlets seems a bit confusing even though it seems the right way to build solid rock applications, actually, i could begin with applets and remote database and later go to an applet-servlet application)
Any good suggestion is welcome, but, please ,don't tell me about .net

You can make a database connection via an Applet or an Servlet. You can make a database connection via Applet - Servlet - Database also.
Making db connecion using applets or servlets is easy task.
Visit the site's applet section to have an example. Since you are a beginner, it might look like a nightmare ;-)
Hope it helps
Uma
http://www.javagalaxy.com

Database connection in applet works in Netscape but not in IE

Hello,
we have an applet which connects through an jdbc:odbc connection to an Access database.
When we run it in Netscape 4.7, the applet connects to the database and finds records. When we run it in IE (5.5), we get an error.
Haven't completely figured out where, but most likely when we try to get the connection:
con = DriverManager.getConnection(url, "loginname", "password");
We end up in the catch block.
Any suggestions what the problem could be?
TIA
Gunter

Can u send me code and let me see.
Tell me all specification which Access driver you are using and which DSN you are using.
Let me know i know i can help u out.

Connect applet to database using JDBC

I try to connect Applet to database, but have error:
Access denied (Java.lang.Runtime.Permission access Class In paclage.sun.jdbc.odbc)
I think the reason is the security issue, but how to implement the security issue in the code?
Help me...

If you aren't using the plugin, changing the policy file for the Java Runtime Environment (JRE) won't do anything. Changing the policy file and signing the applet are two ways of granting an applet permission. I only use changing the policy file for testing purposes. I broke down and bought a certificate after I realized I would have to change the policy file on hundreds of machines, and do it again if the server changed.
You sound like you should be using the plugin. Appletviewer knows about the JRE and uses it. You need to change your HTML to use EMBED and OBJECT tags instead of APPLET tags (use HTMLConverter).
sun.jdbc.obdc.JdbcOdbcDriver is in rt.jar, which is in /Prog Files/Javasoft/JRE/1.3???/lib and is installed when the pluggin is installed (which happens automagically when using the EMBED and OBJECT tags). It was also loaded on your development machine when you installed the SDK.
You can remove the need to sign the applet to test whether this is a security problem or machine configuration problem. If you copy the .html and .class files to a directory on a machine you expect it to run on, start your browser and type 'C:\MyDirectory\MyApplet.html' in the address bar. Applets loaded locally are granted all permissions.

I want to connect an applet with an access database

I want to connect an applet with an access(*.mdb) database, how I do?
I now the jdbc odbc bridge but how work it?
Please Help me!!!!!!!!!!

If you want access database please install IDSSERVER and import j102.sql.*;
Example:
import java.awt.*;
import java.io.*;
import j102.sql.*;
public class AccessMdb extends Applets {
Connection con;
ResultSet rs;
Statement stmt;
IDSDriver drv;
String _url ="jdbc:ids://localhost:your port /conn?dsn="your database"";
// make connection to database
drv = new j102.sql.IDSDriver();
try{
con = drv.connect(_url,null);
stmt = con.createStatement();
// query database
stmt.executeQuery("your SQL statement");
}catch(Exception ex){
System.out.println(ex.getMessage());
Good luck.

How to get database connection in applet

Hi,
I am trying to prepare database connection in applet. After preparing connection with database it'll read same values from table.
At the time of development it works fine. I have used esclipse IDE for coding and testing.
But when I try to call that applet from browser. It is giving ClassNotFound exception.
Does anybody know How to get database connection in applet ?
Please help me if anybody know solution for this.
Thanks,
Rajesh

As per my knowledge is conserned
1 u can get the database connection in a jsp page and u send the result set as param to the applet and u can use retrieved values as if they were of the same applet if u r interested i can send the db connetion coding for jsp my id [email protected]

Applet / SQL Database communication

I am developing an applet that needs to connect to a SQL Database to keep track of a variety of information. I am running into some errors when I try to connect to the database.
Can anyone tell me the best way for an applet to connect to a SQL database without editing the client's policy file to give permission?
Any help with this matter would be much appreciated.
Thanks.

I am developing an applet that needs to connect to a
SQL Database to keep track of a variety of
information. I am running into some errors when I
try to connect to the database.
Can anyone tell me the best way for an applet to
connect to a SQL database without editing the
client's policy file to give permission?
Any help with this matter would be much appreciated.
Thanks.The best way to communicate to the database from an applet is through a servlet. But if you seriously want anybody to decompile your applet code and really fry your db its upto you. I wouldnot communicate directly from an applet to a db its not worthwhile

Jdbc connectivity through applet problem   urgent ASAP

hi ,
am trying to connect to the oracle database through applet. it gives a classnotfound exception . the same code works for other applications but not through the applet . why ? any idea to get it worked.I need to use this applet in a jsp file . in jsp file it gives an SQLexception as : java.security.AccessControlException:access denied(java.util.PropertyPermission oracle.jserver.version read)
how do i get it solved . please help me.
here is the applet code :
import java.awt.*;
import javax.swing.*;
import java.lang.*;
import java.util.*;
import java.sql.*;
public class Dot extends JApplet
    int xinterval,yinterval;
     private String message = "Initializing";
// int xexp=-40,yexp=20;
    Vector result = new Vector();
    Vector result1 = new Vector();
     public void init()
     int max = 100;
     int min = -100;
     xinterval = max/10;
     yinterval = min/10;
     try{
     Class.forName("oracle.jdbc.driver.OracleDriver");
     Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL","chandu","chandu");
     PreparedStatement ps = con.prepareStatement("select name,expression_level,functional_classification from viewall where subexperiment_id = SRB4delta");
     PreparedStatement ps1 = con.prepareStatement("select name,expression_level,functional_classification from viewall where subexperiment_id = SRB5delta");
    ResultSet rs = ps.executeQuery();
    ResultSet rs1 = ps1.executeQuery();
     while(rs.next()){
          String arr[] = new String [3];
          arr[1]=rs.getString(1);
          arr[2]=rs.getString(2);
        arr[3]=rs.getString(3);
          result.addElement(arr);
while(rs1.next()){
          String arr[] = new String [3];
          arr[1]=rs.getString(1);
          arr[2]=rs.getString(2);
        arr[3]=rs.getString(3);
          result1.addElement(arr);
     con.close();
     rs1.close();
     rs.close();
catch (Exception e)
              setError("SQLException: " + e);
     public void paint (Graphics g)
if (result == null) {
         g.drawString(message, 5, 50);
         return;
     for(int i = 0 ; i<=10;i++){
          String temp= String.valueOf(xinterval*i);
          String temp1=String.valueOf(xinterval*(10-i));
          g.drawString(temp,500+(50*i),510);
        g.drawString(temp1,480,(50*i));
         temp=String.valueOf(yinterval*i);
          temp1=String.valueOf(yinterval*(10-i));
        g.drawString(temp,480,500+(50*i));
        g.drawString(temp1,(50*i),510);
     g.drawLine(500,0,500,1000);
    g.drawLine(0,500,1000,500);
    Enumeration enum = result.elements();
    Enumeration enum1 = result1.elements();
     while (enum.hasMoreElements() & enum1.hasMoreElements()) {
       String arr[] = new String [3];
       String arr1[] = new String [3];
       arr = (String [])enum.nextElement();
      arr1 = (String [])enum1.nextElement();
     String col = arr[2] ;
     if(col.equals("CC"))
          g.setColor(Color.red);
     else if(col.equals("CF"))
          g.setColor(Color.green);
     else if (col.equals("S"))
          g.setColor(Color.blue);
     else if (col.equals("T"))
          g.setColor(Color.gray);
     else if (col.equals("U"))
          g.setColor(Color.pink);
     else if (col.equals("M"))
         g.setColor(Color.magenta);
     else if (col.equals("E"))
        g.setColor(Color.yellow);
     else
         g.setColor(Color.black);
    int xexp = Integer.parseInt(arr[1]);
     int yexp = Integer.parseInt(arr1[1]);
    g.drawString("test",500,600);
     if(yexp<0 & xexp>0)
      g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp<0 & xexp<0)
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp>0 & xexp>0)
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
     if(yexp>0 & xexp<0){
              g.fillOval(500+((xexp/10)*50),500-((yexp/10)*50),8,8);
    private synchronized void setError(String mess) {
     result = null;
     message = mess;
     repaint();
}

In contrast to what many people say in this forum, it is possible to have an unsigned applet access a database. You don't even have to manipulate the client's policy-file. The requirement is that the database is located on the same machine as the applet is downloaded from.There are however other things that can break this possibility. One is the database-driver itself.
In the case of Oracle we have tried using different versions of the driver. When using version 8.1.7 or 9.0.1 things work nicely, but when switching to version 9.2 it stops working. There is a question on OTN [1]. Let's see what Oracle has to say about it.
[1] Problem connecting using Oracle JDBC drivers

Applet - Servlet - Database - Servlet- Applet

Hi All,
I am using Oracle8i and IE 5.0. I am trying to retrieve the data from a db table and display it.
Sequence is as following:
1. Query passed to the applet.
2. Servlet excutes this query using JDBC and returns the resultset to applet.
3. Applet displaysthe results.
Is there anybody who has a code sample to do this, my id is [email protected] ? I am totally new to java and servlets. I would really appreciate any help.
Thanks a lot.
Manuriti
[email protected]

I've never dealt with the code to handle the applet portion of what you're trying to do, but I can help you with the servlet stuff.
Your servlet should contain code to accomplish the following steps:
1. Load an Oracle JDBC driver into memory.
2. Open a JDBC connection to the Oracle database.
3. Create a JDBC Statement object which contains the appropriate Oracle SQL code.
4. Execute the Statement object, which will return a ResultSet.
5. Read the ResultSet data.
6. Pool or close the Statement and Connection objects.
All of these steps are simple. Here's what they might look like in practice:
// load the Oracle driver
Class.forName("oracle.jdbc.driver.OracleDriver");
// open the connection
String cs = "jdbc:oracle:[email protected]:1521:DBNAME"; // connection string
String userName = "scott";
String password = "tiger";
Connection con = DriverManager.getConnection(cs, userName, password);
// create a Statement object
Statement stmt = con.createStatement();
// create a ResultSet object
ResultSet rs = stmt.executeQuery("select * from DUAL"); // your SQL here
// INSERT CODE HERE TO READ DATA FROM THE RESULTSET
// close the Statement object
stmt.close();
// close the Connection object
con.close();
So that's how you get data from your Oracle database. Now, how do you pass it to your applet? Well, this is hardly trivial. Typically, servlets return an HTML-formatted text stream. It is possible to have an applet communicate with a servlet, but that raises security issues that I don't fully understand. I believe you would have to have your user's browsers set to the lowest possible security settings, otherwise the browser won't let the applet open a socket to a foreign IP, but again, I'm shaky on that one.
Anywho, let me know if this was of help and if you have more questions on the servlet/applet stuff. I can probably help you with more specific questions,.

Applet And Database

Hi;
Can i do database connectivity through applet if your answer is no then plz give me reasons why?
thanks

Hi,
Can i do database connectivity through applet?Applets loaded over the network are subject to various security restrictions. Although this can seem bothersome at times, it is absolutely necessary for network security, and security is one of the major advantages of using the Java programming language. An applet cannot make network connections except to the host it came from unless the browser allows it. Whether one is able to treat locally installed applets as "trusted" also depends on the security restrictions imposed by the browser. An applet cannot ordinarily read or write files on the host that is executing it, and it cannot load libraries or define native methods.
Applets can usually make network connections to the host they came from, so they can work very well on intranets.
The JDBC-ODBC Bridge driver is a somewhat special case. It can be used quite successfully for intranet access, but it requires that ODBC, the bridge, the bridge native library, and JDBC be installed on every client. With this configuration, intranet access works from Java applications and from trusted applets. However, since the bridge requires special client configuration, it is not practical to run applets on the Internet with the JDBC-ODBC Bridge driver. Note that this is a limitation of the JDBC-ODBC Bridge, not of JDBC.
With a pure Java JDBC driver, you do not need any special configuration to run applets on the Internet.
Hope this helps.
Good Luck.
Gayam.Srinivasa Reddy
Developer Technical Support
Sun Micro Systems
http://www.sun.com/developers/support

Applets and Databases....

Hi all,
thanks in advance for any subsequent posts.
I was wondering if anyone could tell me if you use an applete to interact with a database. I have read some tutorials on this and I am confused by them. I have some classes set up to allow for connection to a mysql database, but was wanting to use an applete as apposed to a small program to start this off. At the moment I am getting a:
java.net.SocketException
MESSAGE: java.security.AccessControlException: access denied(java.net.SocketPermission 127.0.0.1:3306 connect, resolve
I am trying to connect to a Mysql database on the same system that I am trying to run the applete on.
thanks for all posts,
Mark.
Message was edited by:
Marky_boy

Appologies all, found the answer is another post. I will try signing my applete...
..thanks again,
Marky Boy...

Signed applet and database connetion...

Hello,
Well, I am deploying an applet application which needs to connect with a postgres database.
I put my application in my hosting then I changed my local java.policy file adding a line as
permission java.net.SocketPermission "127.0.0.1:5432", "connect,resolve";And my applet works... but I don't want that the user needs to change his policies file.
I read in somewhere in the forum if the applet is signed the user doesn't need to change anything... then I sign the applet. But it doesn't work. It looks to me that signing the applet is not enough to allows the connection.
But I don't sure.
Some body had had the same problem or am I doing some thing wrong?? Other Ideas
By the way, sorry for my bad english, I hope you can understand what I am saying.
Bye, and thanks by advance

4NDR01D3 wrote:
Thanks for the answer.
That's a good test, I put some code before the DB connection to create a file:
              File file = new File("tavo.txt");
             boolean success = file.createNewFile();
             if (success) {
                  javax.swing.JOptionPane.showMessageDialog(null, "YES");
                 // File did not exist and was created
             } else {
                  javax.swing.JOptionPane.showMessageDialog(null, "NO");
                 // File already exists
             }And surprisingly it creates the file. but doesn't connect to the database.
I Sign the applet by command line, like this:
keytool -genkey -alias signFiles -keystore compstore -keypass pass -dname "cn=salazar" -storepass pass
jarsigner -keystore compstore -storepass pass -keypass pass -signedjar Sproceso.jar proceso.jar signFiles
baftos wrote:Or at least one of the classes that are on the stack when you cpnnect to the database does not come from > the signed jar.Out of the Jar are the JDBC files(postgres.jar), it could be the problem??Your JAR is signed OK and this is good.
DB connections are not prohibited as such.
What is prohibited are Socket connections, which DB connections use internally.
Therefore, if any of the classes on the stack, when the Socket connection occurs
is not from your jar, it will fail. Therefore, the 3rd party files must be all in your jar.
Technically, this is easy: explode their jar and create your jar in such a way as to contain
all the files from their jar as well. Do it just as an experiment. If it works, read well
their licensing terms, which may forbid this. If they forbid it or if in doubt, contact them.

Dw cs5 with existing wordpress site hosted on yahoo need help connecting to existing remote database

I am having trouble establishing a database connection. I can connect with test databases but am having trouble using dreamweaver wtih my existing wordpress website. Am I able to use dreamweaver to edit and live view my changes before uploading the changed files to my live site? Am I able to access my existing wordpress database with dreaweaver? I have imported it to my testing server/database but still seem to be having trouble establishing a connection with it (think maybe my folder hierarchy might be off).
macintosh HD/Applications/MAMP/htdocs/nwm/wp/index.php
"nwm" is the name of the folder that I have copied all of my site files to and the folder I have dreamweaver pointing to. "wp" is what I have all of the wordpress files in (the ones I copied from my yahoo server - including all my current theme files etc.)
I am trying to put the info into the mysql connection dialog box:
Connection Name: Testing (i am assuming this name is for my benefit only and doesn't actually matter)
MySQL Server: mysql
User Name: *****
Password: *****
Database: wp
and am getting this message
MySQL Error#: 2013
Lost connection to MySQL server at 'reading initial communication packet', system error 61
did some google seaches of the error. Tried turning off the firewall, and the advance tab allow mysql incoming (there were 2 one was allow one was not allow. I changed both to allow)
Cant really find anything on yahoo to help me out. Looked in phpmyadmin database named wp: wp_users to get the username and password (which due to previous look for help - I think the password was encrypted cuz it looked like a bunch of mumbo jumbo and am fairly certain I know the correct password).
Any help would be greatly appreciated!! I spent $50 on live chat last night trying to resolve the issue only to find out at the end that the guy really didn't understand my problem and doesn't have dreamweaver. I have also watched countless videos on Lynda.com and have been thru forum after forum. While this problem is only a couple weeks old since I just got CS5. I have been having trouble making any headway learning php since I cant seem to make it past the set up parts. I have done the php / mysql essential training on lynda.com with relative success except that I really dont want to work with any more exercise files so I didn't go on to the beyond the basics. I recently went thru most of the Dreamweaver CS5 and Wordpress 3. Also did the first 4 chapters of Dreamweaver CS5 with PHP and MySQL. I need to start integrating things into my live sites. I am also trying to work my way thru the learning php, mysql, javascript book by o'reily media by robin nixon (as fun as reading a math text book) can't get thru it since I can't relate any of it to my current sites/needs
I am on MacBookPro OSX 10.6.6
Installed MAMP to specification on all 20 tutorials I have tried including lynda.com
Tested the testing server and is working
Just installed dreamweaver cs5
have been using wordpress online to create and edit posts (recently upgraded to 3.? whatever the latest update was online which I believe update the files on my yahoo server?)
Have also installed wordpress on my computer (several times thru each tutorial trying to get this right.)
Am I expecting the impossible?

If wordpress controls it's own connection why am I unable to use the live view. I have synced the remote site to my local computer so all the files should be just as they are online with the exception of the DB which contains most of the content.
I have done all of those steps. I have even exported the database from inside internet phpmyadmin and imported into computer phpmyadmin. When I hit live view I get one of couple of errors.
1. "One is that the dynamic related files could not be displayed due to an internal server error"
At some point I was able to view some sample files inside dreamweaver. But I would like to be able to view my real site files. I was able to "connect" to the local databases (not the copy of my real one - I think that maybe that was because it is somehow nested inside another db an am going try to reimport to new location). And then I changed the host/username/password trying to deal with the internal server error. Now instead I get the cannot connect to the database Error 2016 or whatever from the origianl post. Also, I am using yahoo if that matters and all I can find about what their server name is: mysql - is that correct?
I have been thru this so many times with so many different tutorials I am losing track of what is what.
2. Can I access my remote database within dreamweaver? I do not want to create dummy files (seems to be a waste of time). And while if it had worked exporting/importing a duplicate on to my computer would have satisfied me for a little while it also seems some what counter productive. Since every post and page is different if I were doing a daily updates etc how would I be able to change the formating or design of them if I can't access the remote files. Would I re- import everytime I want to work on it to get current database?
I am trying to be clear. I listed all the specs I could think as listed in your "how to get help fast post" (yes I read that at least twice too) of all of the steps and possible reasons for my problems. I also thought that the forum was on a seperate site so I didn't think it would count as a duplicate. I am frustrated to tears and am feeling incredibly stupid that after all this time and all these tutorials yes you are right I obviously am not understanding what is going on which is why I am on this forum.

Connecting to a Mysql database using CF Administrator and DW

I can't create a mysql datasource in CF Administrator.
If I use the following datasource settings in CF
Administrator:
JDBC URL: jdbc:mysql://localhost:3306/test
Drive Class: MySQL Connector J
AND (note the emphasis) I set my local and remote folders in
my DW site local folder, remote folder and testing server folders
all to C:\CFusionMX\db\, I can connect to my mysql database in CF
Administrator.
However, with these DW site folder settings, DW doesn't
recognize any databases (Access or Mysql) at all.
When I change my DW site folder settings to 'wwwroot'
(e.g.local folder C:\CFusionMX\db\' is changed to
'C:\CFusionMX\wwwroot') DW now lists all my CF Administrator
databases.
The problem is CF Administrator can't connect to my Mysql
data sources. It gives me the error:
"Connection verification failed for data source: javaserver
[]java.sql.SQLException: SQLException occurred in JDBCPool
while attempting to connect, please check your username, password,
URL, and other connectivity info.
The root cause was that: java.sql.SQLException: SQLException
occurred in JDBCPool while attempting to connect, please check your
username, password, URL, and other connectivity info"
I've tried changing the 3306 port to 8500, but this doesn't
help.
My java path and connector file is:
C:\CFusionMX\wwwroot\WEB-INF\lib\mysql-connector-java-3.0.17-ga-bin.jar,
Is this a ID/password problem? I've tried both 'root' and
leaving the ID field in the CF Administrator add data source block,
both to no avail. I don't have a password set in Mysql for 'root'
either.
Any help would be gratefully appreciated. I've been working
on this for weeks and keep running into one problem after another.
Thanks a million in advance.
Sincerely,
Graham A. Kerby

1) ensure mysql server is running
2) there are numerous tutorials for mysql installation out
there
3) there are good free mysql admin tools out there
4) use both the above to verify your mysql installation is
correct
5) please tell me you do have your zonealarm DISABLED
hth
Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com

Connecting to a Mysql database using a ColdFusion server

can't create a mysql datasource in CF Administrator.
If I use the following datasource settings in CF
Administrator:
JDBC URL: jdbc:mysql://localhost:3306/test
Drive Class: MySQL Connector J
AND (note the emphasis) I set my local and remote folders in
my DW site local folder, remote folder and testing server folders
all to C:\CFusionMX\db\, I can connect to my mysql database in CF
Administrator.
However, with these DW site folder settings, DW doesn't
recognize any databases (Access or Mysql) at all.
When I change my DW site folder settings to 'wwwroot'
(e.g.local folder C:\CFusionMX\db\' is changed to
'C:\CFusionMX\wwwroot') DW now lists all my CF Administrator
databases.
The problem is CF Administrator can't connect to my Mysql
data sources. It gives me the error:
"Connection verification failed for data source: javaserver
[]java.sql.SQLException: SQLException occurred in JDBCPool
while attempting to connect, please check your username, password,
URL, and other connectivity info.
The root cause was that: java.sql.SQLException: SQLException
occurred in JDBCPool while attempting to connect, please check your
username, password, URL, and other connectivity info"
I've tried changing the 3306 port to 8500, but this doesn't
help.
My java path and connector file is:
C:\CFusionMX\wwwroot\WEB-INF\lib\mysql-connector-java-3.0.17-ga-bin.jar,
Is this a ID/password problem? I've tried both 'root' and
leaving the ID field in the CF Administrator add data source block,
both to no avail. I don't have a password set in Mysql for 'root'
either.
Any help would be gratefully appreciated. I've been working
on this for weeks and keep running into one problem after another.
Thanks a million in advance.
Sincerely,
Graham A. Kerby

If it were me I would use the MySQL JDBC driver and not ODBC. Then DSN versus not-DSN wouldn't be an issue.

Connecting an applet to database

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