DB Validation Class

<?php

class DB_Connection {

    //Subject to change
    protected $_DATABASE = '#';
    protected $_HOST       = '#';

    protected $_SELECT = array( 'connection' => null,
                              'user'    => '#',
                              'pass'    => '#',
                              'alive'   => FALSE,
                              'thread'  => '' );

    protected $_INSERT = array( 'connection' => null,
                              'user'    => '#',
                              'pass'    => '#',
                              'alive'   => FALSE,
                              'thread'  => '' );

    protected $_DELETE = array( 'connection' => null,
                              'user'    => '#',
                              'pass'    => '#',
                              'alive'   => FALSE,
                              'thread'  => '' );

    protected $_UPDATE = array( 'connection' => null,
                              'user'    => '#',
                              'pass'    => '#',
                              'alive'   => FALSE,
                              'thread'  => '' );

    /**
     * Take an input and create that connection and connect to the database
     * using the appropriate logins
     * @param $type - Type of connection; SELECT, UPDATE, DELETE, INSERT
     */
    public function __construct( $type ) {

        switch($type) {
            case "SELECT":

                // Create the connection
                $this->_SELECT['connection'] = new mysqli($this->_HOST,
                                                          $this->_SELECT['user'],
                                                          $this->_SELECT['pass'],
                                                          $this->_DATABASE );
                // State that the connection is alive
                $this->_SELECT['alive'] = TRUE;

                // Put in the thread ID that is created when the connection is established
                $this->_SELECT['thread'] = $this->_SELECT['connection']->thread_id;

                // Verify that the connection was successfull
                if($this->_SELECT['connection']->connect_error) {
                    die('Connection error: ' . $this->_SELECT['connection']->connect_errorno . ' ' .
                                               $this->_SELECT['connection']->connect_error );
                    //TODO Create better error handling
                } else {
                    echo "connection worked somehow.<br />";
                }

            case "INSERT":
                // Create the connection
                $this->_INSERT['connection'] = new mysqli($this->_HOST,
                                                      $this->_INSERT['user'],
                                                      $this->_INSERT['pass'],
                                                      $this->_DATABASE );
                // State that the connection is alive
                $this->_INSERT['alive'] = TRUE;

                // Put in the thread ID that is created when the connection is establishedq
                $this->_INSERT['thread'] = $this->_INSERT['connection']->thread_id;

                // Verify that the connection was successfull
                if($this->_INSERT['connection']->connect_error) {
                    die('Connection error: ' . $this->_INSERT['connection']->connect_errorno . ' ' .
                                               $this->_INSERT['connection']->connect_error );
                    //TODO Create better error handling
                } else {
                    echo "connection worked somehow.<br />";
                }

            case "DELETE":
                // Create the connection
                $this->_DELETE['connection'] = new mysqli($this->_HOST,
                                                      $this->_DELETE['user'],
                                                      $this->_DELETE['pass'],
                                                      $this->_DATABASE );
                // State that the connection is alive
                $this->_DELETE['alive'] = TRUE;

                // Put in the thread ID that is created when the connection is establishedq
                $this->_DELETE['thread'] = $this->_DELETE['connection']->thread_id;

                // Verify that the connection was successfull
                if($this->_DELETE['connection']->connect_error) {
                    die('Connection error: ' . $this->_DELETE['connection']->connect_errorno . ' ' .
                                               $this->_DELETE['connection']->connect_error );
                    //TODO Create better error handling
                } else {
                    echo "connection worked somehow.<br />";
                }

            case "UPDATE":
                // Create the connection
                $this->_UPDATE['connection'] = new mysqli($this->_HOST,
                                                      $this->_UPDATE['user'],
                                                      $this->_UPDATE['pass'],
                                                      $this->_DATABASE );
                // State that the connection is alive
                $this->_UPDATE['alive'] = TRUE;

                // Put in the thread ID that is created when the connection is establishedq
                $this->_UPDATE['thread'] = $this->_UPDATE['connection']->thread_id;

                // Verify that the connection was successfull
                if($this->_UPDATE['connection']->connect_error) {
                    die('Connection error: ' . $this->_UPDATE['connection']->connect_errorno . ' ' .
                                               $this->_UPDATE['connection']->connect_error );
                    //TODO Create better error handling
                } else {
                    echo "connection worked somehow.<br />";
                }

        }// END CASE

    }// END _construct


    public function get_Select_Con() {
        return $this->_SELECT['connection'];
    }
    public function get_Insert_Con() {
        return $this->_INSERT['connection'];
    }
    public function get_Delete_Con() {
        return $this->_DELETE['connection'];
    }
    public function get_Update_Con() {
        return $this->_UPDATE['connection'];
    }


    /**
     * Kill the threads and close the connection
     */
    public function __destruct() {
        if ($this->_SELECT['alive'] == TRUE) {
            $this->_SELECT['connection']->kill($this->_SELECT['thread']);
            $this->_SELECT['connection']->close();
            echo " thread killed and connection closed";
        }
        if ($this->_INSERT['alive'] == TRUE) {
            $this->_INSERT['connection']->kill($this->_INSERT['thread']);
            $this->_INSERT['connection']->close();
            echo " thread killed and connection closed";
        }
        if ($this->_DELETE['alive'] == TRUE) {
            $this->_DELETE['connection']->kill($this->_DELETE['thread']);
            $this->_DELETE['connection']->close();
            echo " thread killed and connection closed";
        }
        if ($this->_UPDATE['alive'] == TRUE) {
            $this->_UPDATE['connection']->kill($this->_UPDATE['thread']);
            $this->_UPDATE['connection']->close();
            echo " thread killed and connection closed";
        }
    }// END _destruct
}