Java by API/java.sql/ConnectionPoolDataSource

ConnectionPoolDataSource: getPooledConnection()

   <source lang="java">

import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.sql.ConnectionPoolDataSource; import javax.sql.PooledConnection; public class Main {

 public static void main(String[] args) throws Exception {
   Connection connection = getConnection();
   // Do work with connection
   Statement statement = connection.createStatement();
   String selectEmployeesSQL = "SELECT * FROM employees";
   ResultSet resultSet = statement.executeQuery(selectEmployeesSQL);
   while (resultSet.next()) {
     printEmployee(resultSet);
   }
   resultSet.close();
   statement.close();
   connection.close();
 }
 private static Connection getConnection() throws NamingException, SQLException {
   InitialContext initCtx = createContext();
   String jndiName = "HrDS";
   ConnectionPoolDataSource dataSource = (ConnectionPoolDataSource) initCtx.lookup(jndiName);
   PooledConnection pooledConnection = dataSource.getPooledConnection();
   return pooledConnection.getConnection(); // Obtain connection from pool
 }
 private static InitialContext createContext() throws NamingException {
   Properties env = new Properties();
   env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.rmi.registry.RegistryContextFactory");
   env.put(Context.PROVIDER_URL, "rmi://localhost:1099");
   InitialContext context = new InitialContext(env);
   return context;
 }
 private static void printEmployee(ResultSet resultSet) throws SQLException {
   System.out.print(resultSet.getInt("employee_id") + ", ");
   System.out.print(resultSet.getString("last_name") + ", ");
   System.out.print(resultSet.getString("first_name") + ", ");
   System.out.println(resultSet.getString("email"));
 }

}

 </source>