SQL Server 创建用户定义的表类型，但架构无法正常工作 [英] SQL Server create User-Defined Table Types with schema not working properly

问题描述

我正在使用以下语句在 SQL Server 2008R2/2012 上创建用户定义的表类型:

I'm creating User-Defined Table Types on SQL Server 2008R2/2012 with this statement:

CREATE TYPE [MySchemaName].[MyUserTableType] 
   As Table ( [Id] varchar(20) NOT NULL );

这按预期工作.

我还得到了一个存储过程，用于删除给定架构的所有关联对象.这是我的用户定义表类型无法正常工作的地方.我期待这些类型是使用关联的模式创建的.

I also got a stored procedure which deletes all associated object to a given Schema. This is where my User-Defined Table Types are not working properly. I am expecting that those Types are created with an associated schema.

如果我尝试删除架构，它会抱怨架构与我的用户定义表类型相关联.因此它不会被删除.

If i try to drop the schema, it will complain that the schema is associated with my User-Defined Table Type. Hence it will not be deleted.

但是如果我查询数据库中所有类型为 TYPE_TABLE 的对象，它会告诉我我的表类型不属于我的架构.它们属于架构sys"

But if i query all objects in my DB which are TYPE_TABLE it tells me that my Table types do not belong to my schema. They belong to the schema 'sys'

SELECT name, schema_id, type_desc 
FROM [TESTDB].SYS.OBJECTS 
WHERE type_desc = 'TYPE_TABLE';

SELECT * FROM sys.schemas;

知道为什么吗?

这是我输出的截图

推荐答案

与其在 sys.objects 中查找，不如在 sys.types 或 中查找>sys.table_types(另外公开了 type_table_object_id).

Instead of looking in sys.objects for these you should look in sys.types or sys.table_types (which additionally exposes the type_table_object_id).

SELECT name,
       schema_id /*Will be the "test" schema id*/
FROM   sys.types
WHERE  is_table_type = 1
       AND name = 'MyUserTableType'

当您创建用户定义的类型时，它会向 sys.sysscalartypes 添加一行，其中包含用户提供的架构和名称，并向 sys.sysschobjs 添加一行，并生成系统sys 架构中的名称.系统生成的名称是通过连接 TT_ + FriendlyName + _ + 对象 ID 的十六进制版本来创建的.

When you create a user defined type it adds a row to sys.sysscalartypes with the user supplied schema and name and a row to sys.sysschobjs with a system generated name in the sys schema. The system generated name is created by concatenating TT_ + FriendlyName + _ + Hex version of object id.

这两个实体通过sys.syssingleobjrefs

/*This query only works via the DAC*/
SELECT so.id AS object_id,
       st.id AS user_type_id,
       *
FROM   sys.sysschobjs so
       JOIN sys.syssingleobjrefs sor
         ON sor.indepid = so.id
       JOIN sys.sysscalartypes st
         ON st.id = sor.depid
WHERE  st.name = 'MyUserTableType' 

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