Question

为什么我不能在具有varbinary filestream列的表上使用而不是删除触发器？

是否有解决方法？

我想在执行删除命令时更新字段。

由于

Answer 1

您可以创建两个表而不是一个：

CREATE TABLE [dbo].[FileStreams](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [RowGuid] [uniqueidentifier] ROWGUIDCOL  NOT NULL,
    [Data] [varbinary](max) FILESTREAM  NULL,
    CONSTRAINT [PK_FileStreams] 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],
    UNIQUE NONCLUSTERED 
    (
        [RowGuid] ASC
    )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY] FILESTREAM_ON [FilestreamGroup]
GO

CREATE TABLE [dbo].[Files](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](1024) NULL,
    [FileStreamId] [int] NOT NULL,
    CONSTRAINT [PK_Files] 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]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[Files]  WITH CHECK ADD  CONSTRAINT [FK_Files_FileStreams] FOREIGN KEY([FileStreamId])
REFERENCES [dbo].[FileStreams] ([Id])
GO

ALTER TABLE [dbo].[Files] CHECK CONSTRAINT [FK_Files_FileStreams]
GO

外键必须是NO ACTION。它允许您为表文件

创建INSTEAD OF触发器

Answer 2

文件流表通常不支持所有类型的INSTEAD OF触发器 - 在这种情况下，DELETE也没有区别。原因可能是在UPDATE触发器和带外更新（来自.Net或Win32）的情况下它会有非常复杂的语义。

如果您提供有关您的方案的更多详细信息，那么也许有人可以为您提供解决方法。

而不是使用FileStream删除触发器

2 个答案: