import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.sql.PooledConnection;
import oracle.jdbc.pool.OracleConnectionPoolDataSource;
public class ConnPool {
public static void main(String[] args) throws Exception {
OracleConnectionPoolDataSource ocpds = new OracleConnectionPoolDataSource();
ocpds.setURL("jdbc:oracle:thin:@localhost:1521:ORCL");
ocpds.setUser("user");
ocpds.setPassword("password");
PooledConnection pc_1 = ocpds.getPooledConnection();
Connection conn_1 = pc_1.getConnection();
Statement stmt = conn_1.createStatement();
ResultSet rs = stmt.executeQuery("SELECT count(*) FROM v$session WHERE username = 'SYS'");
rs.next();
String msg = "Total connections after ";
System.out.println(msg + "conn_1: " + rs.getString(1));
Connection conn_2 = pc_1.getConnection();
stmt = conn_2.createStatement();
rs = stmt.executeQuery("SELECT count(*) FROM v$session WHERE username = 'SYS'");
rs.next();
System.out.println(msg + "conn_2: " + rs.getString(1));
PooledConnection pc_2 = ocpds.getPooledConnection();
rs = stmt.executeQuery("SELECT count(*) FROM v$session WHERE username = 'SYS'");
rs.next();
System.out.println(msg + "pc_2: " + rs.getString(1));
conn_1.close();
conn_2.close();
pc_1.close();
pc_2.close();
}
}