The SelectFunction attribute is used to define a database function that is called when selecting the object from database. This function might be used to get the last access date of an object in database. Have a look at the following example.

        /// <summary>

        /// Gets or sets the last read.

        /// </summary>

        /// <value>The last read.</value>

        [SelectFunction("GETDATE()")]

        public DateTime LastRead

        {

            get { return lastRead; }

            set { lastRead = value; }

        }

The created SQL looks like:

SELECT [DATABASEFUNCTION].* , GETDATE() as LASTREAD FROM [DATABASEFUNCTION]  WHERE [DATABASEFUNCTION].[ID]=’12fca955-12ba-4486-bf89-4bf92d6db13d’;