为什么OLE DB命令尝试更新架构？

Question

我有一个SSIS数据流任务，它将查找匹配的记录并将它们提供给OLE DB Command组件。当我运行它时，我收到一条错误消息：

Error: 0xC0202009 at Data Flow Task, OLE DB Command [28]: SSIS Error Code DTS_E_OLEDBERROR.  An OLE DB error has occurred. Error code: 0x80040E14.
An OLE DB record is available.  Source: "Microsoft SQL Server Native Client 11.0"  Hresult: 0x80040E14  Description: "Property cannot be added. Property 'MS_Description' already exists for 'dbo.d_date.d_date_key'.".

我的SQL是：

UPDATE d_date 
SET company_year_period = ?, 
    company_quarter = ?,  
    company_year_quarter = ?, 
    company_quarter_year = ?, 
    company_first_day_of_week = ?, 
    company_last_day_of_week = ?,
    is_company_holiday = ?, 
    company_special_event = ?, 
    is_us_holiday = ?,
    us_special_event = ?, 
    is_canadian_holiday = ?, 
    canadian_special_event = ?, 
    is_mexican_holiday = ?, 
   mexican_special_event = ?
WHERE d_company_key = ?
AND calendar_date = ?

为什么这个组件/简单更新会弄乱扩展属性？！？

这里完成的是我创建表时使用的代码。

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'Primary key for the d_date table.  While it is a surrogate key it never the less has the form yyyymmdd.' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'd_date', @level2type=N'COLUMN',@level2name=N'd_date_key'

CREATE TRIGGER d_date_update ON d_date
AFTER UPDATE
AS
    UPDATE d_date
    SET last_update = GETDATE()
    WHERE d_date_key IN (SELECT DISTINCT d_date_key FROM Inserted)
;

我有一个表d_date，每列都有MS_Description的扩展属性。该表填充了2558个日期记录。我有一个没有扩展属性的第二个工作表。它还填充了一些略有不同的记录。以下更新失败：

UPDATE dd 
SET dd.company_year_period = wdd.company_year_period,
dd.company_quarter = wdd.company_quarter, 
dd.company_year_quarter = wdd.company_year_quarter, 
dd.company_quarter_year = wdd.company_quarter_year, 
dd.company_first_day_of_week = wdd.company_first_day_of_week, 
dd.company_last_day_of_week = wdd.company_last_day_of_week, 
dd.is_company_holiday = wdd.is_company_holiday, 
dd.company_special_event = wdd.company_special_event, 
dd.is_us_holiday = wdd.is_us_holiday, 
dd.us_special_event = wdd.us_special_event, 
dd.is_canadian_holiday = wdd.is_canadian_holiday, 
dd.canadian_special_event = wdd.canadian_special_event, 
dd.is_mexican_holiday = wdd.is_mexican_holiday, 
dd.mexican_special_event = wdd.mexican_special_event
FROM d_date AS dd
LEFT JOIN working_d_date AS wdd ON wdd.d_company_key = dd.d_company_key 
AND wdd.calendar_date = dd.calendar_date

(2558 row(s) affected)
Msg 15233, Level 16, State 1, Procedure sp_addextendedproperty, Line 37
Property cannot be added. Property 'MS_Description' already exists for 'dbo.d_date.d_date_key'.

最后评论： 我在SS2014 Enterprise上运行所有这些，我在工作站上使用试用许可证进行了设置。我不是DBA所以我没有正确设置的可能性很大。

我把所有东西都搬到我们的生产SS2008 R2服务器上，我没有看到任何问题。这可能是2014年和2008年之间的一个问题，但更可能是我2014年安装时的某种设置问题。当我们正式安装2014时，我会再次访问。

Answer 1

疯狂猜测：

当您执行Create Trigger时，您在同一批次中包含了对sp_addextendedproperty的调用..

CREATE TRIGGER d_date_update ON d_date
AFTER UPDATE
AS
    UPDATE d_date
    SET last_update = GETDATE()
    WHERE d_date_key IN (SELECT DISTINCT d_date_key FROM Inserted)


 ;
 --- THIS IS YOUR PROBLEM!!!! 
 --- This has been included in the trigger itself.
 EXEC sys.sp_addextendedproperty @name=N'MS_Description', 
   @value=N'Primary key for the d_date table.  While it is a surrogate key it never the less has the form yyyymmdd.' , 
       @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'd_date', @level2type=N'COLUMN',@level2name=N'd_date_key'

触发器一直持续到批次结束。 分号不会结束批处理它只会结束语句。您必须说 GO 才能结束批次。

更多讨论：SQL的范围规则与C＃完全不同。您可能会想象触发器由单个语句组成，该语句可以是块语句或简单语句，这是一种自然的假设，但事实并非如此。

在你说＆＃34;创建触发＆＃34;，＆＃34;创建程序＆＃34;或者＆＃34;创建功能＆＃34;， 批次结束时的所有内容 是触发器，proc或功能的一部分 。