Question

ComboPooledDataSource cpds = new ComboPooledDataSource(); 
cpds.setDriverClass( "com.mysql.jdbc.Driver" ); //loads the jdbc driver 

cpds.setJdbcUrl( "jdbc:mysql://localhost:3306/dragon" ); 
cpds.setUser("root"); 
cpds.setPassword("password");
cpds.setMaxPoolSize(50);

I’ve created a java file containing the following code to configure a ComboPooledDataSource object. Now is this code enough to establish a pooled connection with the database?

If not, What else should I do ?

Also please tell how can I can implement JNDI here.

Please explain it since I am a beginner.

Answer 1

At First…Create the code to initiate the connection in a class containing static methods or variables like this the following..

        private static ComboPooledDataSource cpds = new ComboPooledDataSource();
        public static void MakePool()
        {
               try 
               {
                 cpds=new ComboPooledDataSource();
                 cpds.setDriverClass("com.mysql.jdbc.Driver");
                 cpds.setJdbcUrl("jdbc:mysql://localhost:3306/att_db");
                 cpds.setUser("root");
                 cpds.setPassword("dragon");
                 cpds.setMaxPoolSize(MaxPoolSize);
                 cpds.setMinPoolSize(MinPoolSize);
                 cpds.setAcquireIncrement(Accomodation);
             } 
             catch (PropertyVetoException ex) 
             {
                 //handle exception...not important.....
              }

}
public static Connection getConnection()
{
           return cpds.getConnection();
}

Once u r done Create another class meant for server operations….

and get the Connections from the Pool…

         try{

               con=DatabasePool.getConnection();
               // DatabasePool is the name of the Class made earlier....
               .
               .
               .
               .  // Server operations as u wanted.....
               .
               .
             }
             catch(SQL EXCEPTION HERE)
             {
                  .....
             }
             finally
             {     
               if(con!=null)
               {
                      con.close();      
               }
             }