SQL语句结合上下文查询（in查询）

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我是靠谱客的博主孝顺硬币，最近开发中收集的这篇文章主要介绍SQL语句结合上下文查询（in查询），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

在多个表联合查询时，使用linq语句查询就显得不那么方便了，执行效率也不高，

SQL语句查询的优势就显现出来了。

                    using (var context = new YZS_TRAEntities())
                    {
                        using (Domain.HRModelsContainer hr = new Domain.HRModelsContainer())
                        {var officeEntities = context.事务所主任.Where(f => officeIds.Contains(f.事务所主任ID)).ToList();

                            #region 获取该协议所有的对象
                            var mobileEntities = officeEntities.Select(f => f.手机.Trim()).ToList();       
                            string mobile = string.Join(",", mobileEntities);                //List数组的每个元素加上引号,如（"12","32","5456","876455"）
                            string s1 = string.Format("'{0}'", mobile.Replace(",", "','"));

                            string sql = string.Format(@"SELECT d.Name [DepartName],c.Name [Position],c.No [PostNo],a.Mobile [EmployeePhone]
FROM [HYSYZSCCODB].[dbo].[Employee] a                                                     //[DepartName] [Position] [PostNo] [EmployeePhone] 是实体officeDTO定义的字段，即转对象
inner join [HYSYZSCCODB].[dbo].[DPEAss] q on a.Id=q.EmployeeId
inner join [HYSYZSCCODB].[dbo].[Post] c on q.PostId=c.Id
inner join [HYSYZSCCODB].[dbo].[Department] d on d.Id = c.DepartmentId      
where  q.IsHistory='false' and a.Mobile" + " in " + "(" + s1 + ")");

//where a.IsValid='true' and q.IsHistory='false' and {0} order by a.[Index] desc",
//DepartId.HasValue ? "a.Id='" + (Guid)DepartId + "'" + "or " + "a.PDepartmentId='" + (Guid)DepartId + "'" : "1=1");

var entitys = hr.Database.SqlQuery<OfficeDTO>(sql).ToList();
                            #endregion
　　                     }
                    }

LIst数组的元素转字符串，（以便用于in查询）

var mobileEntities = officeEntities.Select(f => f.手机.Trim()).ToList();       
                            string mobile = string.Join(",", mobileEntities);                //List数组的每个元素加上引号,如（"12","32","5456","876455"）
                            string s1 = string.Format("'{0}'", mobile.Replace(",", "','"));