40

我需要用 枚举在SQL Server数据库中创建的所有用户定义类型CREATE TYPE,和/或找出它们是否已经被定义。

对于表或存储过程,我会做这样的事情:

if exists (select * from dbo.sysobjects where name='foobar' and xtype='U')
    drop table foobar

但是我找不到用户定义类型的等价物(或合适的替代品)!我绝对看不到他们在任何地方sysobjects

任何人都可以启发我吗?

4

3 回答 3

83

类型和 UDT 不出现在 sys.objects 中。您应该能够通过以下方式获得所需的内容:

select * from sys.types
where is_user_defined = 1
于 2008-09-10T15:53:12.230 回答
16

虽然帖子很旧,但我发现使用类似的查询很有用。您可能不会发现某些格式有用,但我想要完全限定的类型名称,并且我想查看按顺序列出的列。您可以仅删除所有 SUBSTRING 内容以单独获取列名。

SELECT USER_NAME(TYPE.schema_id) + '.' + TYPE.name      AS "Type Name",
       COL.column_id,
       SUBSTRING(CAST(COL.column_id + 100 AS char(3)), 2, 2)  + ': ' + COL.name   AS "Column",
       ST.name                                          AS "Data Type",
       CASE COL.Is_Nullable
       WHEN 1 THEN ''
       ELSE        'NOT NULL' 
       END                                              AS "Nullable",
       COL.max_length                                   AS "Length",
       COL.[precision]                                  AS "Precision",
       COL.scale                                        AS "Scale",
       ST.collation                                     AS "Collation"
FROM sys.table_types TYPE
JOIN sys.columns     COL
    ON TYPE.type_table_object_id = COL.object_id
JOIN sys.systypes AS ST  
    ON ST.xtype = COL.system_type_id
where TYPE.is_user_defined = 1
ORDER BY "Type Name",
         COL.column_id
于 2015-07-21T21:22:08.470 回答
5

为了扩展 jwolly2 的答案,您可以通过以下方式获取定义列表,包括标准数据类型:

-- User Defined Type definitions TP 20180124
select t1.name, t2.name, t1.precision, t1.scale, t1.max_length as bytes, t1.is_nullable
from sys.types t1
join sys.types t2 on t2.system_type_id = t1.system_type_id and t2.is_user_defined = 0
where t1.is_user_defined = 1 and t2.name <> 'sysname'
order by t1.name
于 2018-01-24T15:47:22.083 回答