wordpresss插件创建与删除数据表

wordpress在开发插件过程有时候需要创建自定义的数据表，实现方法很简单，将以下代码放于你的插件文件中即可：

<?php
function plugin_name_activation() {
	require_once( ABSPATH . '/wp-admin/includes/upgrade.php' );
	global $wpdb;
	$db_table_name = $wpdb->prefix . 'table_name';
	if( $wpdb->get_var( "SHOW TABLES LIKE '$db_table_name'" ) != $db_table_name ) {
		if ( ! empty( $wpdb->charset ) )
			$charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
		if ( ! empty( $wpdb->collate ) )
			$charset_collate .= " COLLATE $wpdb->collate";
 
		$sql = "CREATE TABLE " . $db_table_name . " (
			`id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,
			`type` varchar(100) NOT NULL DEFAULT '',
			`extra` longtext NOT NULL,
			`date_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
			PRIMARY KEY (`id`)
		) $charset_collate;";
		dbDelta( $sql );
	}
}
register_activation_hook(__FILE__, 'plugin_name_activation');
?>

插件卸载时删除表代码：

function pluginUninstall() {

        global $wpdb;
        $table = $wpdb->prefix."your_table_name";

        //Delete any options thats stored also?
	//delete_option('wp_yourplugin_version');

	$wpdb->query("DROP TABLE IF EXISTS $table");
}
register_deactivation_hook( __FILE__, 'pluginUninstall' );