How to make connection Pool for standalone Application
hi
I have got an application to craete a stadalone appliaction for connection pool.But it is taking m more time to create the Connection and fetch the data.
import java.sql.*;
import java.util.*;
/** A class for preallocating, recycling, and managing
* JDBC connections.
* <P>
* Taken from Core Servlets and JavaServer Pages
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* © 2000 Marty Hall; may be freely used or adapted.
public class ConnectionPool implements Runnable {
private String driver, url, username, password;
private int maxConnections;
private boolean waitIfBusy;
private Vector availableConnections, busyConnections;
private boolean connectionPending = false;
public ConnectionPool(String driver, String url,
String username, String password,
int initialConnections,
int maxConnections,
boolean waitIfBusy)
throws SQLException {
this.driver = driver;
this.url = url;
this.username = username;
this.password = password;
this.maxConnections = maxConnections;
this.waitIfBusy = waitIfBusy;
if (initialConnections > maxConnections) {
initialConnections = maxConnections;
availableConnections = new Vector(initialConnections);
busyConnections = new Vector();
for(int i=0; i<initialConnections; i++) {
availableConnections.addElement(makeNewConnection());
public synchronized Connection getConnection()
throws SQLException {
if (!availableConnections.isEmpty()) {
Connection existingConnection =
(Connection)availableConnections.lastElement();
int lastIndex = availableConnections.size() - 1;
availableConnections.removeElementAt(lastIndex);
// If connection on available list is closed (e.g.,
// it timed out), then remove it from available list
// and repeat the process of obtaining a connection.
// Also wake up threads that were waiting for a
// connection because maxConnection limit was reached.
if (existingConnection.isClosed()) {
notifyAll(); // Freed up a spot for anybody waiting
return(getConnection());
} else {
busyConnections.addElement(existingConnection);
return(existingConnection);
} else {
// Three possible cases:
// 1) You haven't reached maxConnections limit. So
// establish one in the background if there isn't
// already one pending, then wait for
// the next available connection (whether or not
// it was the newly established one).
// 2) You reached maxConnections limit and waitIfBusy
// flag is false. Throw SQLException in such a case.
// 3) You reached maxConnections limit and waitIfBusy
// flag is true. Then do the same thing as in second
// part of step 1: wait for next available connection.
if ((totalConnections() < maxConnections) &&
!connectionPending) {
makeBackgroundConnection();
} else if (!waitIfBusy) {
throw new SQLException("Connection limit reached");
// Wait for either a new connection to be established
// (if you called makeBackgroundConnection) or for
// an existing connection to be freed up.
try {
wait();
} catch(InterruptedException ie) {}
// Someone freed up a connection, so try again.
return(getConnection());
// You can't just make a new connection in the foreground
// when none are available, since this can take several
// seconds with a slow network connection. Instead,
// start a thread that establishes a new connection,
// then wait. You get woken up either when the new connection
// is established or if someone finishes with an existing
// connection.
public void makeBackgroundConnection() {
connectionPending = true;
try {
Thread connectThread = new Thread(this);
connectThread.start();
} catch(OutOfMemoryError oome) {
// Give up on new connection
public void run() {
try {
Connection connection = makeNewConnection();
synchronized(this) {
availableConnections.addElement(connection);
connectionPending = false;
notifyAll();
} catch(Exception e) { // SQLException or OutOfMemory
// Give up on new connection and wait for existing one
// to free up.
// This explicitly makes a new connection. Called in
// the foreground when initializing the ConnectionPool,
// and called in the background when running.
public Connection makeNewConnection()
throws SQLException {
try {
// Load database driver if not already loaded
Class.forName(driver);
// Establish network connection to database
Connection connection =
DriverManager.getConnection(url, username, password);
return(connection);
} catch(ClassNotFoundException cnfe) {
// Simplify try/catch blocks of people using this by
// throwing only one exception type.
throw new SQLException("Can't find class for driver: " +driver);
public synchronized void free(Connection connection) {
busyConnections.removeElement(connection);
availableConnections.addElement(connection);
// Wake up threads that are waiting for a connection
notifyAll();
public synchronized int totalConnections() {
return(availableConnections.size() +
busyConnections.size());
/** Close all the connections. Use with caution:
* be sure no connections are in use before
* calling. Note that you are not <I>required</I> to
* call this when done with a ConnectionPool, since
* connections are guaranteed to be closed when
* garbage collected. But this method gives more control
* regarding when the connections are closed.
public synchronized void closeAllConnections() {
closeConnections(availableConnections);
availableConnections = new Vector();
closeConnections(busyConnections);
busyConnections = new Vector();
public void closeConnections(Vector connections) {
try {
for(int i=0; i<connections.size(); i++) {
Connection connection =
(Connection)connections.elementAt(i);
if (!connection.isClosed()) {
connection.close();
} catch(SQLException sqle) {
// Ignore errors; garbage collect anyhow
public synchronized String toString() {
String info =
"ConnectionPool(" + url + "," + username + ")" +
", available=" + availableConnections.size() +
", busy=" + busyConnections.size() +
", max=" + maxConnections;
return(info);
}///// The Calling Class is below---------/////////////////
import java.util.*;
import java.sql.*;
public class dbConnection
public static void main(String[] args)
String driver="oracle.jdbc.driver.OracleDriver";
String username="ETS";
String password="ETS";
String url="jdbc:oracle:thin:@192.168.47.10:1521:ETS";
int initialConnections=10;
int maxConnections=50;
boolean waitIfBusy=false;
Connection con=null;
Statement stmt = null;
ResultSet rs = null;
try
System.out.println("Before constructory "+new java.util.Date());
ConnectionPool pool=new ConnectionPool(driver,url,username,password,initialConnections,maxConnections,waitIfBusy);
System.out.println("After constructory "+new java.util.Date());
con=pool.makeNewConnection();
System.out.println("After Connection pool "+new java.util.Date());
String sql="select * from emp_master";
stmt = con.createStatement();
rs = stmt.executeQuery(sql);
while(rs.next()) {
int login1=rs.getInt("emp_code");
System.out.println("Employee Code is "+login1);
System.out.println("check 2");
String pass=rs.getString("PASSWORD");
System.out.println("Pass Word is "+pass);
}catch(Exception e)
System.out.println("Exception is "+e);
finally {
}
I once created a connection pool programatically with Apache DBCP API. It didnt took more than 10 lines. Unforchunetly I dont have to code with me now.
But If I remember right there is a sample code for that in the Apache Commans DBCP documentation.
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For JBuilder :
URL : jdbc:informix-sqli://tra019746:1526/vka:informixserver=vka
Driver : com.informix.jdbcx.IfxXADataSource
username : informix; password : informix
For WebLogic :
URL : jdbc:informix-sqli://tra019746:1526/vka:informixserver=vka
Driver : com.informix.jdbcx.IfxXADataSource
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url=jdbc:informix-sqli://tra019746:1526/vka:informixserver=vka
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>
>
Error:
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DataSource(TestEntity)
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at weblogic.jdbc.common.internal.JdbcInfo.validateConnectionPool(JdbcInfo.java:127)
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Hoang Nguyen wrote:
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The driver that I use comes from informix.
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There's something wrong in the configuration with Weblogic.
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Joseph Weinstein <[email protected]> wrote:
Ok, I would like you to download Informix's driver from them, and
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Hoang Nguyen wrote:
Hi,
I forgot to mention that I'm working with Weblogic server 7 and
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For the configuration, I followed the example given by Weblogic
http://edocs.bea.com/wls/docs70/jdbc/thirdparty.html#thirdparty001,
table 5.2
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user=username
url=jdbc:informix-sqli://dbserver_name_or_ip:port_num/dbname:informixserver=dbserver_name_or_ip
password=password
portNumber =port_num;
databaseName=dbname
serverName=dbserver_name
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If you take a look at the link, you'll see a note :
"In the Properties string, there is a space between portNumber and=". I've tried
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Joseph Weinstein <[email protected]> wrote:
Nguyen Hoang wrote:
Hi all,
could you please help me to create a connection pool for informix?
I use a com.informix.jdbcx.IfxXADataSource driver and here are
the
properties
user=informix
password=informix
url=jdbc:informix-sqli://TW010766:1526/vka:informixserver=TW010766
dataSourceName=TestEntityPool2
portNumber=1526
databaseName=vka
ifxIFXHOST=TW010766
serverName=vka
Here is the error message :
Error during Data Source creation: weblogic.common.ResourceException:DataSource(TestEntity)
can't be created with non-existent Pool (connection or multi)
(TestEntityPool2)
This means the pool was unable to make an informix connection withthe
properties
you gave. Please show me the few lines from an informix driver
example
program
that makes a successful JDBC connection to the DBMS you want, andI will
show
you how to define a pool for weblogic to do the same.
Joe
at weblogic.jdbc.common.internal.JdbcInfo.validateConnectionPool(JdbcInfo.java:127)
at weblogic.jdbc.common.internal.JdbcInfo.startDataSource(JdbcInfo.java:189)
at weblogic.jdbc.common.internal.JDBCService.addDeploymentx(JDBCService.java:293)
at weblogic.jdbc.common.internal.JDBCService.addDeployment(JDBCService.java:270)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentTarget.java:375)
at weblogic.management.mbeans.custom.DeploymentTarget.addDeployments(DeploymentTarget.java:303)
at weblogic.management.mbeans.custom.DeploymentTarget.updateServerDeployments(DeploymentTarget.java:256)
at weblogic.management.mbeans.custom.DeploymentTarget.updateDeployments(DeploymentTarget.java:207)
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Many thanks in advance.
Hoang -
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"whats are the settings (URL, driver, properties) required to set up a connection pool for DB2 on OS/390 ?I'm using "COM.ibm.db2.jdbc.app.DB2Driver" as DB2 driver
Amit wrote:
>
"whats are the settings (URL, driver, properties) required to set up a connection pool for DB2 on OS/390 ?I'm using "COM.ibm.db2.jdbc.app.DB2Driver" as DB2 driverHi. If you can successfully use that driver with one of it's simple
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