我在这里遇到了一些难题。我的主要目标是能够在C#和Entity Framework中使用它,而我们从上面得到的指令是要远离存储过程。
我有两个表:一个交叉引用表和一个(Celko)树状表。
/**
** Table [dbo].[EntityXref]
**/
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'EntityXref' AND type = N'U')
DROP TABLE [dbo].[EntityXref]
GO
CREATE TABLE dbo.[EntityXref]
( Id BIGINT IDENTITY(1,1) NOT NULL
, EntityId INT NOT NULL
, EntityTypeId INT NOT NULL
, ChildEntityId INT NOT NULL
, ChildEntityTypeId INT NOT NULL
, CONSTRAINT [PK_EntityXref] PRIMARY KEY NONCLUSTERED ([Id] ASC) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
, CONSTRAINT [UQ_EntityXref] UNIQUE CLUSTERED (EntityId, EntityTypeId, ChildEntityId, ChildEntityTypeId)
)
/**
** Table [dbo].[EntityTree]
**/
IF EXISTS(SELECT * FROM sys.tables WHERE name = N'EntityTree' AND type = N'U')
DROP TABLE dbo.EntityTree
GO
CREATE TABLE dbo.EntityTree
( Id BIGINT IDENTITY(1,1) NOT NULL
, SystemId INT NOT NULL DEFAULT 1
, EntityId INT NOT NULL -- could be an AgencyId, UserId, ClientId, VendorId, etc
, EntityTypeId INT NOT NULL -- Defines the entity type
, isActive BIT NOT NULL
, lft BIGINT NOT NULL
, rgt BIGINT NOT NULL
, CONSTRAINT [PK_EntityTree] PRIMARY KEY CLUSTERED ([Id] ASC) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
, CONSTRAINT [UQ_Entity] UNIQUE NONCLUSTERED (EntityId, EntityTypeId)
, CONSTRAINT [UQ_Left] UNIQUE NONCLUSTERED ([lft])
, CONSTRAINT [UQ_LeftRight] UNIQUE NONCLUSTERED ([lft], [rgt])
)
GO
基本的树形数据如下:
客户 -> 机构 -> 用户 -> 客户端
我们还有管理多个机构的用户,因此有交叉引用(不好的名称)表。我正在测试一个单一用户,该用户概述了98%的机构,并且我需要所有客户端。所以,我的难题是:
注意:
EntityTypeId = 7 -> 用于报告生成的用户帐户 EntityTypeId = 4 -> 客户帐户
这需要运行4秒钟,但不能表示为视图:
DECLARE @t TABLE
( childentityid INT
, childentitytypeid INT
)
INSERT INTO @t
SELECT et.RootEntityId, et.RootEntityTypeId
FROM dbo.EntityXref et
WHERE et.EntityId = 17088 AND et.EntityTypeId = 7
SELECT *
FROM @t a
INNER JOIN dbo.GetMyCaseLoad b ON a.RootEntityId = b.ParentEntityId AND a.RootEntityTypeId = b.ParentEntityTypeId
GO
这个操作需要运行36-40秒(对这个连接操作进行了多种不同的排列组合!)
WITH xrefParent (parentEntityId, parentEntityTypeId) --, rootEntityId, rootEntityTypeId)
AS (SELECT ChildEntityId, ChildEntityTypeId /*, EntityId, EntityTypeId */ FROM dbo.EntityXref WHERE EntityId = 17088 AND EntityTypeId = 7)
SELECT *
FROM GetMyCaseLoad cl
INNER JOIN xrefParent p ON cl.ParentEntityId = p.parentEntityId AND cl.ParentEntityTypeId = p.parentEntityTypeId
-- WHERE p.rootEntityId = 17088 AND p.rootEntityTypeId = 7
GO
有什么办法可以将临时表的好处转化为视图,以供Entity Framework使用?
新增定义:
CREATE VIEW GetMyCaseLoad AS
SELECT Parent.Id [ParentRecordId]
, Parent.EntityId [ParentEntityId]
, Parent.EntityTypeId [ParentEntityTypeId]
, Child.SystemId [ChildSystemId]
, Child.Id [ChildRecordId]
, Child.EntityId [ChildEntityId]
, Child.EntityTypeId [ChildEntityTypeId]
, Child.isActive [ChildIsActive]
, Child.lft [ChildLeft]
, Child.rgt [ChildRight]
FROM dbo.EntityTree Parent
, dbo.EntityTree Child
WHERE Child.lft > Parent.lft
AND Child.rgt < Parent.rgt
AND Child.EntityTypeId = 4
GO
CREATE VIEW GetMyFullCaseLoad AS
SELECT x.Id [XrefRecordId]
, x.EntityId [XrefParentEntityId]
, x.EntityTypeId [XrefParentEntityTypeId]
, c.ParentRecordId
, c.ParentEntityId
, c.ParentEntityTypeId
, c.ChildRecordId
, c.ChildEntityId
, c.ChildEntityTypeId
, c.ChildIsActive
, c.ChildLeft
, c.ChildRight
, x.CanRead
, x.CanWrite
FROM EntityXref x
INNER JOIN dbo.GetMyCaseLoad c ON x.ChildEntityId = c.ParentEntityId AND x.ChildEntityTypeId = c.ParentEntityTypeId
GO
第二个视图是我们试图加速的内容。
顺带一提,当前系统需要大约2-3分钟才能返回记录。基于新的数据结构(邻接树 vs 集合树),第二个视图或公共表表达式可以在40秒内完成此操作。使用临时表则只需要4秒钟。