DBCP Connection Pooling

=>We can use DBCPConnection pooling in standalone applications or web based application to connect with database
=>Here i am using mysql db
=>First download dbcp related jars/add dependencies for maven
=>Write the code to create connection pooling

pom.xml for Maven Dependencies

 <dependencies>

  <dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
     
     <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.26</version>
</dependency>
            
  </dependencies>

Program:

import java.sql.*;
import org.apache.commons.dbcp.BasicDataSource;

/**
 * 
 * @author ramakrishna.v
 *
 */
public class DBCPWithMySQLExample {

public static void main(String[] args) {

BasicDataSource bds = new BasicDataSource();
bds.setDriverClassName("com.mysql.jdbc.Driver");
bds.setUrl("jdbc:mysql://localhost:3306/ramakrishna");
bds.setUsername("root");
bds.setPassword("root");

try {
Connection con = bds.getConnection();

System.out.println("MaxActive:::::::::"+bds.getMaxActive());
System.out.println("MaxIdle:::::::::::"+bds.getMaxIdle());
System.out.println("Initial Size:::::::::::"+bds.getInitialSize());
System.out.println("Present no.of Active::::::::"+bds.getNumActive());
System.out.println("Present Idle:::::::::::"+bds.getNumIdle());


bds.setMaxActive(25);
bds.setMaxIdle(10);
bds.setInitialSize(5);

System.out.println("MaxActive:::::::::"+bds.getMaxActive());
System.out.println("MaxIdle:::::::::::"+bds.getMaxIdle());
System.out.println("Initial Size:::::::::::"+bds.getInitialSize());
System.out.println("Present no.of Active::::::::"+bds.getNumActive());
System.out.println("Present Idle:::::::::::"+bds.getNumIdle());

con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

Output:

MaxActive:::::::::8
MaxIdle:::::::::::8
Initial Size:::::::::::0
Present no.of Active::::::::1
Present Idle:::::::::::0
MaxActive:::::::::25
MaxIdle:::::::::::10
Initial Size:::::::::::5
Present no.of Active::::::::1
Present Idle:::::::::::0