HELP IN DATABASE CONNECTIVITY IN A SERVLET`

HI there,
I have some issues in an application. I have a servlet which is called Servlet1.class. I have deployed this in my tomcat webapps folder. There is a stand alone application called MailAgent.class which pools into a mail box and retrieves the messages and converts them as HTTP messages. Then the MailAgent.class sends the HTTP message as multipart post (email message) to the servlet. In the servlet I am trying to establish a database connection with the JDBC driver from third party vendor. I am unable to get the driver class when I establish the connection with the database. Is there any issues with servlet and database access. I am able to connect if I run as a stand alone application.
Any help would be greatly appreciated.
Thanks
John

There shouldn't be any .class file in your webapps folder. I hope you mean that you created a subdirectory under webapps, with a WEB-INF under that and /classes and /lib under that. Your servlet .class file and its package directory structure belong under webapps/yourApp/WEB-INF/classes, right?
You can create database connections in a servlet, although I agree with the previous poster that you'd be better off putting database code into objects that you could test off-line, without the servlet.
You've got to have the JDBC driver JARs in the webapps/yourApp/WEB-INF/lib directory, for starters.
If you get really adventurous you can create a pooled JNDI data source, but maybe that's another day's work. Get the basic connection working first.

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Unable to acheive database connectivity in my servlet prog.....

HELLO ALL......
IM USING ORACLE 9I(ORAHOME 90) FOR MY DATABASE CONNECTIVITY..PLUS IM USING TOMCAT 5.5.7 ..... IM TRYING TO ACHIEVE CONNECTIVITY USING JDBCODBC BRIDGE....THAT IS DRIVER OF THE FIRST TYPE.....IM NOT USING THIN DRIVER.....BUT SOMEHOW MY SERVLET IS NOT ACHIEVING THE DATABASE CONNECTIVITY....IT SHOWS NO DATA SOURCE NAME FOUND AND NO DEFAULT DRIVER SPECIFIED....... I DONT KNOW WHAT THE PROBLEM IS .... I TRIED TO FIND IT ON THE NET AND APPLIED SOME OF THE MEASURES BUT NOT FRUITFUL......... ONE SOLUTION SAID THAT I NEED TO PLACE OJDBC14.JAR FILE IN MY COMMON/LIB FOLDER ...BUT IM UNABLE TO FIND THAT JAR FILE.....WHAT TO DO.. PLEASE HELP...... IM TOTALLY FRUSTRATED DUE TO WHICH IM NOT ABLE TO DO ANY SERVLET PROGRAMMING THAT INVOLVES DATABASE CONNECTIVITY...
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First of all, don't type everything in uppercase. It is unreadable and impolite (to shout at someone).
Second, you should not be using the JDBC-ODBC driver for connecting to a Oracle database. There is a pure Java type -4 driver for Oracle available for download. Check the Oracle download page.
Third, your ojdbc14.jar should NOT be added to common/lib. You should place it in the WEB-INF/lib for the web application. It is not a good idea to mix custom jars with the server libraries.
Finally, you need to configure a datasource in Tomcat and use that to obtain a connection.
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jndi-datasource-examples-howto.html

Using database connection in a servlet and get errors after 8 hours

Hey,
I'm running a poker script using applet/servlets and it works great. But for some reason about about 8 hours that database layer stops working. At first I thought it was the connections to mySQL that were timing out (because im using connection pooling) but after turning pooling off (I now create the connection each time) I'm still seeing that same error (I can create a connection but when I do an action ex. like a select statment I get an error). What i'm wondering could it be that the driver I load with Class.forName() some how unloads it's self after x amount of time not being used? Not sure if that is it but if anyone could give me some insight that would be great. The Error i recieve is below:
INFO: Database Event:DatabaseController: Error executing database query.
ERROR: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: Software caused connection abort: recv failed
STACKTRACE:
java.net.SocketException: Software caused connection abort: recv failed
     at java.net.SocketInputStream.socketRead0(Native Method)
     at java.net.SocketInputStream.read(Unknown Source)
     at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:104)
     at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:144)
     at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:172)
     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1839)
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2288)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2784)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1622)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2370)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2297)
     at com.mysql.jdbc.Statement.executeQuery(Statement.java:1183)
     at com.softnet.database.DatabaseController.executeDatabaseQuery(DatabaseController.java:190)
     at com.softnet.games.GameServer.validateUser(GameServer.java:438)
     at com.softnet.games.GameServer.handleData(GameServer.java:113)
     at com.softnet.network.HttpConnectionThread.run(HttpServletListener.java:191)
** END NESTED EXCEPTION **
I know the query is good because it works all other times just not after about 8 hours.
--Z3r0CooL

Hey,
Thanks for the responces. For the connection pooling I would open 5 connections and keep them open. So i though maybe after 8 hours after not being used they would timeout. Thats why i turned off conection pooling and create a new connection each time. Anyways i'll post the code below incase i made a mistake somewhere.
package com.softnet.database;
/************************ DatabaseControler **************************/
import java.sql.*;
import java.util.*;
import com.softnet.database.DatabaseConnectionPool;
import com.softnet.database.DatabaseSettings;
public class DatabaseController
implements DatabaseListener
     //Used to make sure the database driver is loaded
     private boolean databaseDriverState = false;
     //Used to store a database connection
     private Connection databaseConnection = null;
     //If to user connection pooling or not
     private boolean useConnectionPooling = false;
     //Used to hold the connection pool varible
     private DatabaseConnectionPool connectionPool = null;
     //Used to store database settings
     private DatabaseSettings databaseSettings;
     //Used to hold the DatabaseController listeners
     private List databaseControllerListeners = new ArrayList();
     //min number of connections for connection pool
     private int minNumberOfConnections = 1;
     //max number of connections for connection pool -1 is unlimited
     private int maxNumberOfConnections = -1;
     //DatabaseController Constructors
     public DatabaseController(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
          databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
     public DatabaseController(DatabaseSettings databaseSettings, boolean useConnectionPooling, int minNumberOfConnections, int maxNumberOfConnections)
          this.databaseSettings = databaseSettings;
          this.useConnectionPooling = useConnectionPooling;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          if(useConnectionPooling == true)
               connectionPool = new DatabaseConnectionPool(databaseSettings, minNumberOfConnections, maxNumberOfConnections);
               connectionPool.addDatabaseListener(this);
          else
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
     public DatabaseController() {}
     //Database Settings Get/Set
     public DatabaseSettings getDatabaseSettings()
          return databaseSettings;
     public void setDatabaseSettings(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
     //Connection Pooling Get/Set
     public boolean getConnectionPooling()
          return useConnectionPooling;
     public void setConnectionPooling(boolean useConnectionPooling, int minNumberOfConnections, int maxNumberOfConnections)
          this.useConnectionPooling = useConnectionPooling;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          if(useConnectionPooling == true)
               if(connectionPool == null)
                    connectionPool = new DatabaseConnectionPool(databaseSettings, minNumberOfConnections, maxNumberOfConnections);
                    connectionPool.addDatabaseListener(this);
          else
               if(connectionPool != null)
                    connectionPool.destroyConnections();
                    connectionPool.removeDatabaseListener(this);
                    connectionPool = null;
     //Return if there connected
     public boolean isConnected()
          boolean isConnected;
          if(databaseConnection != null)
               isConnected = true;
          else
               isConnected = false;
          return isConnected;
     //Used to connect to database or get a connection for the connection pool
     public void connect()
          if(databaseDriverState == false)
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //If we dont have a current connection, make one
          if(databaseConnection == null && databaseDriverState == true)
               if(useConnectionPooling == false)
                    try
                         databaseConnection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                    catch (SQLException sqle)
                         //Raise event
                         raiseDatabaseEvent("DatabaseController: Error connecting to database. \nERROR: " + sqle.getMessage());
                         databaseConnection = null;
               else
                    databaseConnection = connectionPool.getConnection();
     //Used to disconnect from the database or give back the connection to the connection pool
     public void disconnect()
          if(databaseConnection != null)
               if(useConnectionPooling == false)
                    try
                         //Close DB Connection
                         databaseConnection.close();
                    catch(SQLException ignore) {}
                    finally
                         databaseConnection = null;
               else
                    connectionPool.returnConnection(databaseConnection);
                    databaseConnection = null;
     public ResultSet executeDatabaseQuery(String sSQL)
          ResultSet databaseResult = null;
          if(databaseConnection != null)
               try
                    Statement databaseStatement = databaseConnection.createStatement();
                    databaseResult = databaseStatement.executeQuery(sSQL);
               catch(SQLException sqle)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error executing database query.\nSQL: " + sSQL + "\nERROR: " + sqle.getMessage());
          return databaseResult;
     public int executeDatabaseUpdate(String sSQL)
          int rowsAffected = -1;
          if(databaseConnection != null)
               try
                    Statement databaseStatement = databaseConnection.createStatement();
                    rowsAffected = databaseStatement.executeUpdate(sSQL);
               catch(SQLException sqle)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error executing database update.\nSQL: " + sSQL + "\nERROR: " + sqle.getMessage());
          return rowsAffected;
     //Used to load the Database Driver
     private boolean loadDatabaseDriver(String databaseDriver)
          boolean driverLoaded;
          if(databaseDriver.equals("") == false)
               try
                    //Load Database Driver
                    Class.forName(databaseDriver).newInstance();
                    driverLoaded = true;
               catch (Exception e)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error loading database driver. \nERROR: " + e.getMessage());
                    driverLoaded = false;
          else
               driverLoaded = false;
          return driverLoaded;
     //Wrap the DatabaseConnectionPool Error to the DatabaseController
     public void databaseEventOccurred(DatabaseEvent de)
          raiseDatabaseEvent(de.getErrorMessage());
     //Event Handling Code
     //Used to add database listeners (Its sync'd so you can change the listeners when firing an event)
public synchronized void addDatabaseListener(DatabaseListener databaseControllerListener)
databaseControllerListeners.add(databaseControllerListener);
//Used to remove a listener from the list (Its sync'd so you can change the listeners when firing an event)
public synchronized void removeDatabaseListener(DatabaseListener databaseControllerListener)
databaseControllerListeners.remove(databaseControllerListener);
//Used to send the raise event to the listeners
private synchronized void raiseDatabaseEvent(String databaseError)
DatabaseEvent databaseEvent = new DatabaseEvent(this, databaseError);
Iterator listeners = databaseControllerListeners.iterator();
while(listeners.hasNext())
     DatabaseListener listener = (DatabaseListener) listeners.next();
listener.databaseEventOccurred(databaseEvent);
/********************* DatabaseConnectionPool **************/
package com.softnet.database;
import java.io.*;
import java.sql.*;
import java.util.*;
import com.softnet.database.*;
import com.softnet.database.DatabaseSettings;
public class DatabaseConnectionPool
     //min number of connections
     private int minNumberOfConnections = 1;
     //max number of connections -1 is unlimited
     private int maxNumberOfConnections = -1;
     //Store the connections
     protected Hashtable databaseConnections = null;
     //Database Info
     protected DatabaseSettings databaseSettings;
     //to hold Driver state
     private boolean databaseDriverState = false;
     //To hold connection checker
     private DatabaseConnectionCheck connectionChecker = null;
     //Used to hold the DatabaseConnectionPool listeners
     private List databaseConnectionPoolListeners = new ArrayList();
     public DatabaseConnectionPool(DatabaseSettings databaseSettings, int minNumberOfConnections, int maxNumberOfConnections)
          this.databaseSettings = databaseSettings;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          //Load Driver
          databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //Create connection
          createConnections();
     public DatabaseConnectionPool(int minNumberOfConnections, int maxNumberOfConnections)
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
     //Database Settings Get/Set
     public DatabaseSettings getDatabaseSettings()
          return databaseSettings;
     public void setDatabaseSettings(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
     //Driver State Get
     public boolean getDatabaseDriverState()
          return databaseDriverState;
     public void createConnections()
          if(databaseDriverState == false)
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //Create all connections and load the minimum in the Hashtable
          if(databaseConnections == null)
               if(databaseDriverState == true && minNumberOfConnections != 0)
                    databaseConnections = new Hashtable();
                    for(int i = 0; i < minNumberOfConnections; i++)
                         try
                              databaseConnections.put(DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword()), Boolean.FALSE);
                         catch(SQLException sqle)
                              //Problem break loop and destroy any connections
                              destroyConnections();
                              //Raise event
                              raiseDatabaseEvent("DatabaseConnectionPool: Error creating database connections. \nERROR: " + sqle.getMessage());
                              break;
          //If no connection check exists create one
          if(connectionChecker == null)
               connectionChecker = new DatabaseConnectionCheck(this);
               connectionChecker.start();
     public Connection getConnection()
          Connection connection = null;
          boolean errorWithConnection = false;
          Enumeration connections = databaseConnections.keys();
          synchronized (databaseConnections)
               while(connections.hasMoreElements())
                    errorWithConnection = false;
                    connection = (Connection) connections.nextElement();
                    Boolean state = (Boolean) databaseConnections.get(connection);
                    //If connection is not used, use it.
                    if(state == Boolean.FALSE)
                         try
                              connection.setAutoCommit(true);
                         catch(SQLException e)
                              //Problem with connection remove connection and replace it
                              databaseConnections.remove(connection);
                              try
                                   connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                              catch(SQLException sqle)
                                   errorWithConnection = true;
                         if(errorWithConnection == false)
                              // Update the Hashtable to show this one's taken
                              databaseConnections.put(connection, Boolean.TRUE);
                              // Return the connection
                              return connection;
               //All connections being used check to max to see if we can make a new one
               if(maxNumberOfConnections == -1 || maxNumberOfConnections > databaseConnections.size())
                    try
                         connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                    catch(SQLException sqle)
                         errorWithConnection = true;
                    if(errorWithConnection == false)
                         databaseConnections.put(connection, Boolean.TRUE);
                         return connection;
          //If not connections free and max connections reached wait for a free connection
          return getConnection();
     public void returnConnection(Connection connection)
          boolean errorWithConnection = false;
          //Make sure connection still works
          try
               connection.setAutoCommit(true);
          catch(SQLException e)
               //Problem with connection remove connection and replace it
               databaseConnections.remove(connection);
               try
                    connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
               catch(SQLException sqle)
                    errorWithConnection = true;
          if(errorWithConnection == false)
               databaseConnections.put(connection, Boolean.FALSE);
     public void destroyConnections()
          Connection connection = null;
          if(databaseConnections != null)
               //Close all connections
               Enumeration connections = databaseConnections.keys();
               while (connections.hasMoreElements())
                    connection = (Connection) connections.nextElement();
                    try
                         connection.close();
                    catch(SQLException ignore) {}
               //Free up hashtable
               databaseConnections = null;
     private boolean loadDatabaseDriver(String databaseDriver)
          boolean driverLoaded;
          if(databaseDriver.equals("") == false)
               try
                    //Load Database Driver
                    Class.forName(databaseDriver);
                    driverLoaded = true;
               catch (ClassNotFoundException cnfe)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error loading database driver. \nERROR: " + cnfe.getMessage());
                    driverLoaded = false;
          else
               driverLoaded = false;
          return driverLoaded;
     //Event Handling Code
     //Used to add database listeners (Its sync'd so you can change the listeners when firing an event)
public synchronized void addDatabaseListener(DatabaseListener databaseConnectionPoolListener)
databaseConnectionPoolListeners.add(databaseConnectionPoolListener);
//Used to remove a listener from the list (Its sync'd so you can change the listeners when firing an event)
public synchronized void removeDatabaseListener(DatabaseListener databaseConnectionPoolListener)
databaseConnectionPoolListeners.remove(databaseConnectionPoolListener);
//Used to send the raise event to the listeners
private synchronized void raiseDatabaseEvent(String databaseError)
DatabaseEvent databaseEvent = new DatabaseEvent(this, databaseError);
Iterator listeners = databaseConnectionPoolListeners.iterator();
while(listeners.hasNext())
     DatabaseListener listener = (DatabaseListener) listeners.next();
listener.databaseEventOccurred(databaseEvent);
class DatabaseConnectionCheck extends Thread
     private DatabaseConnectionPool connectionPool;
     DatabaseConnectionCheck(DatabaseConnectionPool connectionPool)
          this.connectionPool = connectionPool;
     public void run()
          try
               while(true)
                    //check threads every 30 seconds
                    this.sleep(300000);
                    if(connectionPool.databaseConnections != null)
                         Connection connection = null;
                         Enumeration connections = connectionPool.databaseConnections.keys();
                         synchronized (connectionPool.databaseConnections)
                              while(connections.hasMoreElements())
                                   connection = (Connection) connections.nextElement();
                                   Boolean state = (Boolean) connectionPool.databaseConnections.get(connection);
                                   //If connection is not used, use it.
                                   if(state == Boolean.FALSE)
                                        try
                                             connection.setAutoCommit(true);
                                        catch(SQLException e)
                                             //Problem with connection remove connection and replace it
                                             connectionPool.databaseConnections.remove(connection);
                                             try
                                                  connection = DriverManager.getConnection(connectionPool.databaseSettings.getDatabaseURL(), connectionPool.databaseSettings.getUserName(), connectionPool.databaseSettings.getUserPassword());
                                             catch(SQLException sqle)
                                                  connection = null;
                                             // Update the Hashtable with new connection if its not null
                                             if(connection != null)
                                                  connectionPool.databaseConnections.put(connection, Boolean.FALSE);
          catch(InterruptedException ignored) {}
Basicly the why it works is the connection pool hold the database connections. When the user needs a connection they use the database controller to request a connection (By create a instance and called the connect() method) and the connection is either created or grabed from the connection pool. After the user is done with the connection they call the disconnect() method which closes the connection or returns it to the connection pool.
--Z3r0CooL

Help with Database Connected LiveCycle ES4 form

Hello and thanks for taking the time to read this question, I hope you can help!
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Help with database connection

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"an unidentified error has occurred"
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and pasting it directly out of my connection properties in navicat
mysql editor which can connect to the database fine
i tried connecting to multiple databases on multiple servers
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past, not sure how these work with OSX

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hello
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%

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Hi everybody:
I got the following message:
java.lang.ClassNotFoundException: weblogic/jdbc/oci/Driver
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public Connection getConnection()
Connection con = null;
Driver myDriver = null;
try
Properties props = new Properties();
props.put("user", "fangc");
props.put("password", "fangc");
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Cristina Fang wrote:
>
Hi everybody:
I got the following message:
java.lang.ClassNotFoundException: weblogic/jdbc/oci/DriverYou won't get that unless your code has:
myDriver = (Driver) Class.forName("weblogic/jdbc/oci/Driver").newInstance();
Make sure your servlet code is just like the right way that you have it
below:
myDriver = (Driver) Class.forName("weblogic.jdbc.oci.Driver").newInstance();
Joe
>
when I try to connect to a Database.
public Connection getConnection()
Connection con = null;
Driver myDriver = null;
try
Properties props = new Properties();
props.put("user", "fangc");
props.put("password", "fangc");
myDriver = (Driver) Class.forName("weblogic.jdbc.oci.Driver").newInstance();
con = myDriver.connect("jdbc:weblogic:oracle:occd01", props);
catch(Exception e)
System.out.println("Connection failed! - " e);
finally
return con;
What am I doing wrong? I try the code without problem for a simple Java Client

Please Help! Database connection

Hey guys,
I know this may seen very simple to some of you and I hope
that you can help me with all of your knowledge. I am trying to set
up a database for the first time. I just want to have a login page
on my site and I have no idea how to get started. I pretty much
need step by step instructions if someone could help. So far my
hosting provider told me some things but I still get an error
message. I was told the best way to connect to a ms sql database is
through a connection string. I tried that and it told me that my
name could not have any " - " in it. Then I tried getting rid of it
and it keeps giving me errors. If someone could please just point
me in the right direction to get started with this then I would be
forever greatful. Thank you so much for any help you can give me.
Jeremy

here is a example of a connection string
"Driver={Microsoft Access Driver (*.mdb)};
DBQ=D:\Webmolder\ajack\training\db\assessment.mdb"

Need help with database connection and trasaction!

Hi, I'm trying to load data from a huge report to DB2. My old way of doing this is: 1. using DriverManger.getConnection to get a connection.
2. Then set autoCommit to false.
3. Keep the connection open.....
4. con.commit once I reach a section, let's say around 5000 records per section.
5. Close the connection once I finish loading, (Finally block)
I'm still new in the java world and kind of concern of the way of what I'm doing. Then I did some research. Perhaps using javax.sql.DataSource is a better approach. But I couldn't use it in WSAD. Do I need do some configuration? I heard it's in j2ee 1.4 . Is that the reason I couldn't use it?
And.......I tried to use DAO pattern to talk with DB. By that way, I have to open and close connection everytime I invoke the dao method. Then how can I control the transaction? Because I don't want to insert each record data in to the table right away. I want to do the commit once I get all records for one section. No idea how can I achieve this.
Any suggestion will be really appreciated!!!

I'm still new in the java world and kind of concern
of the way of what I'm doing. Then I did some
research. Perhaps using javax.sql.DataSource is a
better approach. But I couldn't use it in WSAD. Do I
need do some configuration? I heard it's in j2ee 1.4
. Is that the reason I couldn't use it?What you need to do is configure a Connection datasource. WSAD has that. You just need to go through the documentation and find out. I never worked on it.
And.......I tried to use DAO pattern to talk with DB.
By that way, I have to open and close connection
everytime I invoke the dao method. Then how can I
control the transaction? Because I don't want to
insert each record data in to the table right away. I
want to do the commit once I get all records for one
section. No idea how can I achieve this.Since you want to simply insert multiple records, you might want to insert them in a batch. This is available in PreparedStatements.
$ Carol.

Need Help with Database Connection

Hello,
i have the order to create a Dynamic pfd with Adobe Live Cycle Designer which takes some source information from a Microsoft Access Database.
I am absolutely new in Adobe Live Cycle Designer, but I have experiences in VBA, C++ and Delphi...
Thanks for Help

Ok, got it...

Share database connection between servlets

hello,
i need help to know if the following code works well.
The intention is to share a unique JDBC database connection with all servlets of my application.
//************************ file Conexao.java ***********************
// this class makes a databse connection
import java.sql.*;
public class Conexao
Connection conex;
public void conecta()
try
Class.forName("interbase.interclient.Driver");
conex = DriverManager.getConnection("jdbc:interbase://localhost/c:\\temp\\Kuala.gdb","SYSDBA","masterkey");
catch(ClassNotFoundException ex) { }
catch(SQLException ex) { }
public void desconecta()
try
{ conex.close(); }
catch(SQLException ex) { }
//****************** file SetConnectionContext ****************
// this class creates an instance of Conexao class and invokes the
// conecta() method. After, obtain the ServletContext object and
// set the attribute "conecta" to the ServletContext
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class SetConnectionContext extends HttpServlet
Conexao connection = null;
public void init()
connection = new Conexao();
connection.conecta();
ServletContext context = getServletContext();
context.setAttribute("conecta", connection);
public void destroy()
{ connection.desconecta(); }
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
response.setContentType("text/html");
PrintWriter saida = response.getWriter();
saida.println("<H1>objeto connection atribuido no contexto</H1>");
//****************** file GetConnectionContext.java ******************
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class GetConnectionContext extends HttpServlet
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
response.setContentType("text/html");
PrintWriter saida = response.getWriter();
ServletContext context = getServletContext();
Conexao con = (Conexao) context.getAttribute("conecta");
try {
Statement comando = con.conex.createStatement();
ResultSet rs = comando.executeQuery("SELECT * FROM kl_campanha");
while( rs.next() )
int codCampanha = rs.getInt("codCampanha");
saida.println("<h3>"+codCampanha+"</h3>");
catch(Exception e) { }

I understand the use of a static variable.
But if i want to share a database connection object (a
instance varible instead of class variable) that is
instantiate once and saved in a ServletContext
attribute,
and afterwards the other servlets can get
the object through the ServletContext attribute and
use it. This will works well? i did tests with the
code and everything apparently works.
How does a new connection (different user) get the old context?

HELP IN DATABASE CONNECTIVITY IN A SERVLET`

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