silverstripe-framework/src/ORM/DataObjectInterface.php

<?php

namespace SilverStripe\ORM;

/**
 * DataObjectInterface is an interface that other data systems in your application can implement in order to behave in
 * a manner similar to DataObject.
 *
 * In addition to the methods defined below, the data of the object should be directly accessible as fields.
 */
interface DataObjectInterface
{
    /**
     * Create a new data object, not yet in the database.  To load an object into the database, a null object should be
     * constructed, its fields set, and the write() method called.
     */
    public function __construct();

    /**
     * Write the current object back to the database.  It should know whether this is a new object, in which case this
     * would be an insert command, or if this is an existing object queried from the database, in which case thes would
     * be
     */
    public function write();

    /**
     * Remove this object from the database.  Doesn't do anything if this object isn't in the database.
     */
    public function delete();

    /**
     * Get the named field.
     * This function is sometimes called explicitly by the form system, so you need to define it, even if you use the
     * default field system.
     *
     * @param string $fieldName
     * @return mixed
     */
    public function __get($fieldName);

    /**
     * Save content from a form into a field on this data object.
     * Since the data comes straight from a form it can't be trusted and will need to be validated / escaped.'
     *
     * @param string $fieldName
     * @param mixed $val
     * @return $this
     */
    public function setCastedField($fieldName, $val);
}