Mega Code Archive
PooledConnection
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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"));
}
}
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