EF5.x Code First 一对多关联条件查询,Contains,Any,All

背景

通过多个部门id获取所有用户，部门和用户是多对多。

已知部门id，获取该部门包括该部门下的所有子部门的所有用户。

关系如下：

public class Entity:IEntity
    {
        public Guid Id { get; set; }

        public string CreateUser { get; set; }
        public DateTime CreateTime { get; set; }
        public string ModifyUser { get; set; }
        public DateTime? ModifyTime { get; set; }
        [Timestamp]
        public Byte[] RowVersion { get; set; }
    }
//组织架构
public class WMS_Org : Entity
    {
        public WMS_Org() { }

        public string OrgName { get; set; }
        public string OrgDesc { get; set; }
        public int OrgOrder { get; set; }
        public string OrgFatherId { get; set; }
        public virtual ICollection<WMS_OrgUser> OrgUserIds { get; set; }
    }
//用户
 public class WMS_User : Entity
    {
        public WMS_User() { }

        public string UserName { get; set; }
        public string NickName { get; set; }
        public string UserPwd { get; set; }
        public string Sex { get; set; }
        public string Phone { get; set; }
        public string Email { get; set; }
        public string QQ { get; set; }
        public string Address { get; set; }
        public string Remark { get; set; }
        public virtual ICollection<WMS_OrgUser> UserOrgIds { get; set; }
    }
//组织架构和用户的关联
public class WMS_OrgUser : Entity
    {
        public WMS_OrgUser() { }

        public Guid OrgId { get; set; }
        [ForeignKey("OrgId")]
        public virtual WMS_Org Org { get; set; }

        public Guid UserId { get; set; }
        [ForeignKey("UserId")]
        public virtual WMS_User User { get; set; }
    }
已知组织的id

如上图，我单击0100组织架构，要获取该组织架构下的所有用户，首先由于用户是挂载到每个节点上的，所有需要事先遍历获取所有的子节点获取节点的id

放到Guid[]数组里

提交后台查询
//DBSET=DbSet<WMS_User>，ids=Guid[] ids参数
//第一种方式All
DBSET.Where(p => p.UserOrgIds.All(o=>ids.Contains(o.OrgId)));

//第二种方式Any
DBSET.Where(p => p.UserOrgIds.Any(o=>ids.Contains(o.OrgId)));

注意EF采用Contains构造in的sql语句

很直观的可以看出两个区别，一个是All，一个Any，那么产生的sql有什么区别呢？

//All，EF产生的是inner Join
SELECT 
[Extent1].[Id] AS [Id], 
[Extent1].[UserName] AS [UserName], 
[Extent1].[NickName] AS [NickName], 
[Extent1].[UserPwd] AS [UserPwd], 
[Extent1].[Sex] AS [Sex], 
[Extent1].[Phone] AS [Phone], 
[Extent1].[Email] AS [Email], 
[Extent1].[QQ] AS [QQ], 
[Extent1].[Address] AS [Address], 
[Extent1].[Remark] AS [Remark], 
[Extent1].[Disable] AS [Disable], 
[Extent1].[CreateUser] AS [CreateUser], 
[Extent1].[CreateTime] AS [CreateTime], 
[Extent1].[ModifyUser] AS [ModifyUser], 
[Extent1].[ModifyTime] AS [ModifyTime], 
[Extent1].[RowVersion] AS [RowVersion]
FROM [dbo].[WMS_User] AS [Extent1]
WHERE NOT EXISTS (
SELECT 1 AS [C1]
FROM [dbo].[WMS_OrgUser] AS [Extent2]
WHERE ([Extent1].[Id] = [Extent2].[UserId])
AND (
(
NOT (
[Extent2].[OrgId] IN (CAST('4e108b91-be3c-4cf4-a074-3767b9b8c7dc' AS UNIQUEIDENTIFIER), 
CAST('1cc15f8c-3758-47d3-862a-5287ab5d0651' AS UNIQUEIDENTIFIER), 
CAST('e1bf6f5a-800a-4fd4-9309-576c1d84ba2f' AS UNIQUEIDENTIFIER), 
CAST('a436b8a9-4b3a-4bf9-bbdd-839571e03915' AS UNIQUEIDENTIFIER), 
CAST('b0d6aead-e72f-4fd5-b2cd-e575454d3a4c' AS UNIQUEIDENTIFIER))
)
)
OR (
CASE 
WHEN (
[Extent2].[OrgId] IN (
CAST('4e108b91-be3c-4cf4-a074-3767b9b8c7dc' AS UNIQUEIDENTIFIER), 
CAST('1cc15f8c-3758-47d3-862a-5287ab5d0651' AS UNIQUEIDENTIFIER), 
CAST('e1bf6f5a-800a-4fd4-9309-576c1d84ba2f' AS UNIQUEIDENTIFIER), 
CAST('a436b8a9-4b3a-4bf9-bbdd-839571e03915' AS UNIQUEIDENTIFIER), 
CAST('b0d6aead-e72f-4fd5-b2cd-e575454d3a4c' AS UNIQUEIDENTIFIER))
) THEN CAST(1 AS BIT)
WHEN (
NOT (
[Extent2].[OrgId] IN (
CAST('4e108b91-be3c-4cf4-a074-3767b9b8c7dc' AS UNIQUEIDENTIFIER), 
CAST('1cc15f8c-3758-47d3-862a-5287ab5d0651' AS UNIQUEIDENTIFIER), 
CAST('e1bf6f5a-800a-4fd4-9309-576c1d84ba2f' AS UNIQUEIDENTIFIER), 
CAST('a436b8a9-4b3a-4bf9-bbdd-839571e03915' AS UNIQUEIDENTIFIER), 
CAST('b0d6aead-e72f-4fd5-b2cd-e575454d3a4c' AS UNIQUEIDENTIFIER))
)
) THEN CAST(0 AS BIT)
END IS NULL
)
)
)
//Any方式,EF生成的Exists
SELECT 
[Extent1].[Id] AS [Id], 
[Extent1].[UserName] AS [UserName], 
[Extent1].[NickName] AS [NickName], 
[Extent1].[UserPwd] AS [UserPwd], 
[Extent1].[Sex] AS [Sex], 
[Extent1].[Phone] AS [Phone], 
[Extent1].[Email] AS [Email], 
[Extent1].[QQ] AS [QQ], 
[Extent1].[Address] AS [Address], 
[Extent1].[Remark] AS [Remark], 
[Extent1].[CreateUser] AS [CreateUser], 
[Extent1].[CreateTime] AS [CreateTime], 
[Extent1].[ModifyUser] AS [ModifyUser], 
[Extent1].[ModifyTime] AS [ModifyTime], 
[Extent1].[RowVersion] AS [RowVersion]
FROM [dbo].[WMS_User] AS [Extent1]
WHERE  EXISTS (SELECT 
    1 AS [C1]
    FROM [dbo].[WMS_OrgUser] AS [Extent2]
    WHERE ([Extent1].[Id] = [Extent2].[UserId]) 
    AND ([Extent2].[OrgId] IN 
    (cast('bd3c010c-476f-45e6-8d83-ad741cc55309' as uniqueidentifier),
    cast('4e108b91-be3c-4cf4-a074-3767b9b8c7dc' as uniqueidentifier),
    cast('1cc15f8c-3758-47d3-862a-5287ab5d0651' as uniqueidentifier),
    cast('e1bf6f5a-800a-4fd4-9309-576c1d84ba2f' as uniqueidentifier),
    cast('a436b8a9-4b3a-4bf9-bbdd-839571e03915' as uniqueidentifier),
    cast('b0d6aead-e72f-4fd5-b2cd-e575454d3a4c' as uniqueidentifier),
    cast('79ddb55a-1587-4928-a312-58da0c091459' as uniqueidentifier),
    cast('618de87e-2d97-4c0a-b6c1-acd072c305e2' as uniqueidentifier)))
)

也就是说All是包括条件和不在条件之内的任何值，而Any是严格在条件之内的值，但其实我们想要的是Inner Join的方式，相当于是懒加载方式，那么需要加上Include，也就是

IQueryable<WMS_OrgUser> test5 = _db.wmsOrgUser.Include("User").Where(p => ids.Contains(p.OrgId));
SELECT 
1 AS [C1], 
[Extent1].[Id] AS [Id], 
[Extent1].[OrgId] AS [OrgId], 
[Extent1].[UserId] AS [UserId], 
[Extent1].[CreateUser] AS [CreateUser], 
[Extent1].[CreateTime] AS [CreateTime], 
[Extent1].[ModifyUser] AS [ModifyUser], 
[Extent1].[ModifyTime] AS [ModifyTime], 
[Extent1].[RowVersion] AS [RowVersion], 
[Extent2].[Id] AS [Id1], 
[Extent2].[UserName] AS [UserName], 
[Extent2].[NickName] AS [NickName], 
[Extent2].[UserPwd] AS [UserPwd], 
[Extent2].[Sex] AS [Sex], 
[Extent2].[Phone] AS [Phone], 
[Extent2].[Email] AS [Email], 
[Extent2].[QQ] AS [QQ], 
[Extent2].[Address] AS [Address], 
[Extent2].[Remark] AS [Remark], 
[Extent2].[Disable] AS [Disable], 
[Extent2].[CreateUser] AS [CreateUser1], 
[Extent2].[CreateTime] AS [CreateTime1], 
[Extent2].[ModifyUser] AS [ModifyUser1], 
[Extent2].[ModifyTime] AS [ModifyTime1], 
[Extent2].[RowVersion] AS [RowVersion1]
FROM  [dbo].[WMS_OrgUser] AS [Extent1]
INNER JOIN [dbo].[WMS_User] AS [Extent2] ON [Extent1].[UserId] = [Extent2].[Id]
WHERE [Extent1].[OrgId] IN (
	cast('4e108b91-be3c-4cf4-a074-3767b9b8c7dc' as uniqueidentifier),
	cast('1cc15f8c-3758-47d3-862a-5287ab5d0651' as uniqueidentifier),
	cast('e1bf6f5a-800a-4fd4-9309-576c1d84ba2f' as uniqueidentifier),
	cast('a436b8a9-4b3a-4bf9-bbdd-839571e03915' as uniqueidentifier),
	cast('b0d6aead-e72f-4fd5-b2cd-e575454d3a4c' as uniqueidentifier)
)

　　

条件关联查询，并实现分页
var list = dal.FindByPage(start, pageSize, u => u.OrderByDescending(c => c.CreateTime), u => u.UserOrgIds.All(o => ids.Contains(o.OrgId)), out total);
            //防止转json时候嵌套异常
            var result = from f in list
                       select new
                       {
                           Id = f.Id,
                           UserName = f.UserName,
                           Address = f.Address,
                           Email = f.Email,
                           Sex = f.Sex,
                           CreateUser = f.CreateUser,
                           CreateTime = f.CreateTime,
                           NickName = f.NickName,
                           Phone = f.Phone,
                           QQ = f.QQ,
                           Remark = f.Remark,
                           UserPwd = f.UserPwd
                       };
            return result;
 public virtual IEnumerable<T> FindByPage(int startIndex, int pageSize, Func<IQueryable<T>, IOrderedQueryable<T>> order, Expression<Func<T, bool>> filters, out int Total)
        {
            try
            {
                IQueryable<T> rs = order(DBSET.Where(filters));
                Total = rs.Count();
                if (startIndex < 0 || pageSize < 1)
                {
                    return null;// rs.ToList();
                }
                else
                {
                    return rs.Skip(startIndex * pageSize).Take(pageSize).ToList();
                }
            }
            catch (Exception e)
            {
                Total = 0;
                log.Error("FindByPage:" + order.ToString() + " " + filters.ToString() + " " + e.Message);
                return null;
            }
        }

 

【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/qidian10/p/3143822.html