mysqlconnection

I've read that mysqli introduced connection pooling that was not available in mysql. http://php.net/manual/en/mysqli.quickstart.connections.php I've read this question that explains the difference between connection pooling and persist connections. In the mysqli documentation for Persistent connection they have written that: If a unused persistent connection for a given combination of host, username, password, socket, port and default database can not be found in the connection pool, then mysqli opens a new connection. So, does mysqli use connection pooling for persistent connections? If yes,

I tried to connect to mysql database but I failed and this error is shown Communications link failure Last packet sent to the server was 1 ms ago and this is my code ? anyone can help me please package android_programmers_guide.testconnection; import java.sql.Connection; import java.sql.DriverManager; import android.os.Bundle; import android.app.Activity; import android.graphics.Color; import android.view.Menu; import android.widget.EditText; public class TestConnection extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);