Table.php

<?php

// Takes care of creating, updating and deleting database tables
class scbTable {
	protected $name;
	protected $columns;
	protected $upgrade_method;

	function __construct( $name, $file, $columns, $upgrade_method = 'dbDelta' ) {
		global $wpdb;

		$this->name = $name;
		$this->columns = $columns;
		$this->upgrade_method = $upgrade_method;

		$wpdb->tables[] = $name;
		$wpdb->$name = $wpdb->prefix . $name;

		scbUtil::add_activation_hook( $file, array( $this, 'install' ) );
		scbUtil::add_uninstall_hook( $file, array( $this, 'uninstall' ) );
	}

	function install() {
		global $wpdb;

		$full_table_name = $wpdb->prefix . $this->name;

		$charset_collate = '';
		if ( $wpdb->has_cap( 'collation' ) ) {
			if ( ! empty( $wpdb->charset ) )
				$charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
			if ( ! empty( $wpdb->collate ) )
				$charset_collate .= " COLLATE $wpdb->collate";
		}

		if ( 'dbDelta' == $this->upgrade_method ) {
			require_once ABSPATH . 'wp-admin/includes/upgrade.php';
			dbDelta( "CREATE TABLE $full_table_name ( $this->columns ) $charset_collate" );		
			return;
		}

		if ( 'delete_first' == $this->upgrade_method )
			$wpdb->query( "DROP TABLE IF EXISTS $full_table_name;" );

		$wpdb->query( "CREATE TABLE IF NOT EXISTS $full_table_name ( $this->columns ) $charset_collate;" );
	}

	function uninstall() {
		global $wpdb;

		$full_table_name = $wpdb->prefix . $this->name;

		$wpdb->query( "DROP TABLE IF EXISTS $full_table_name" );
	}
}