using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Entity.Core.Objects.DataClasses;

namespace Bowin.Common.Linq.Entity
{
    public static class SqlFunctionEx
    {
        /// <summary>
        /// 在linq to entity中使用SqlServer.NEWID函数
        /// </summary>
        [EdmFunction("SqlServer", "NEWID")]
        public static Guid NewId()
        {
            return Guid.NewGuid();
        }

        /// <summary>
        /// 随机排序扩展方法
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <returns></returns>
        public static IQueryable<T> OrderByNewId<T>(this IQueryable<T> source)
        {
            return source.OrderBy(d => NewId());
        }
    }
}