PowerDesign 16.0 生成的SQL Server2000 数据库脚本时MS_Description不存在的问题解决

根据网上查询到的资料，找到了解决方法，原文出自：http://www.cnblogs.com/24tt/p/5047257.html

PowerDesign 16.0 生成的Script语句，Sql2000内，带字段备注的语句执行时存在如下错误：

PowerDesigner 无法更新或删除属性。“某某”的属性 MS_Description不存在。

MSSQLSRV2000::Script\Objects\Column\ColumnComment

Modified Column ColComment

修改Column ColumnComment模板路径是 Database -> Edit Current DBMS 窗体 General 选项卡下 Script -> Objects -> Column -> ColumnComment

实际上是默认生成语句存在判断错误：默认的如下（）：

[if exists (select 1 from sysproperties where id = object_id('[%QUALIFIER%]%TABLE%') and type = 4) begin

以上判断是该表是否已存在备注，当有2个及以上备注要添加时（如C1，C2），添加到第二个备注C2，判断系统一定存在，而紧接着需要执行删除C2，因C2都没有添加过需要删除肯定会提示“无法更新或删除属性”了。sp_dropextendedproperty

因此需要修改判断，定位到精准的该字段是否有备注，有则删除，修改为如下（红色为添加部分，SQL2000测试通过）：

[if exists (select 1

from sysproperties where id = object_id('[%QUALIFIER%]%TABLE%') and smallid in(select colid from syscolumns where id = object_id('[%QUALIFIER%]%TABLE%') and name = %.q:COLUMN% and number = 0) and name='MS_Description' and type = 4 ) begin

最后贴出完整的代码：

[if exists (select 1
from sysproperties
where id = object_id('[%QUALIFIER%]%TABLE%')
and smallid in(select colid
from    syscolumns
where    id = object_id('[%QUALIFIER%]%TABLE%')
and name = %.q:COLUMN% and
number = 0) and name='MS_Description'  and type = 4 )
begin
   [%OWNER%?[.O:[execute ][exec ]]sp_dropextendedproperty [%R%?[N]]'MS_Description', 
   [%R%?[N]]'user', [%R%?[N]]%.q:OWNER%, [%R%?[N]]'table', [%R%?[N]]%.q:TABLE%, [%R%?[N]]'column', [%R%?[N]]%.q:COLUMN%
:declare @CurrentUser sysname
select @CurrentUser = user_name()
[.O:[execute ][exec ]]sp_dropextendedproperty [%R%?[N]]'MS_Description', 
   [%R%?[N]]'user', [%R%?[N]]@CurrentUser, [%R%?[N]]'table', [%R%?[N]]%.q:TABLE%, [%R%?[N]]'column', [%R%?[N]]%.q:COLUMN%
]

end


][%OWNER%?[.O:[execute ][exec ]]sp_addextendedproperty [%R%?[N]]'MS_Description', 
   [%R%?[N]]%.q:COMMENT%,
   [%R%?[N]]'user', [%R%?[N]]%.q:OWNER%, [%R%?[N]]'table', [%R%?[N]]%.q:TABLE%, [%R%?[N]]'column', [%R%?[N]]%.q:COLUMN%
:select @CurrentUser = user_name()
[.O:[execute ][exec ]]sp_addextendedproperty [%R%?[N]]'MS_Description', 
   [%R%?[N]]%.q:COMMENT%,
   [%R%?[N]]'user', [%R%?[N]]@CurrentUser, [%R%?[N]]'table', [%R%?[N]]%.q:TABLE%, [%R%?[N]]'column', [%R%?[N]]%.q:COLUMN%
]