在用powerdesigner逆向工程生成PDM时，列注释(ColumnComment)始终无法生成，历经数小时的探索，找到一个折衷的方法，现分享如下。并希望有高手指点更好的方法。
邀月使用的是Powerdesigner 15.2，数据库为SQL Server 2008 r2
方法如下：
1、在PowerDesigner界面－File-Reverse Engineer－Database,然后选择一个DBMS,我这里选取一个由系统默认的SQL Server 2008 DBMS修改而来的SQL_2008_MyDefine。
选好odbc，输入正确的连接串，选择数据库及表。
生成效果：Name为英文，且Comment列为空。
而我们希望的是Name列为中文，Comment为中文。
查看了下在线帮助，发现在SQL_2008_MyDefine::Script\Objects\Column\SqlListQuery下的Value值如下：
View Code
{OWNER, TABLE, S, COLUMN, DTTPCODE, LENGTH, SIZE, PREC, COMPUTE, NOTNULL, IDENTITY, DOMAIN, DEFAULT, ExtIdentitySeedInc, COMMENT, ExtCollation, ExtIdtNotForReplication, ExtDeftConstName, Sparse, FileStream, ExtRowGuidCol}
select
u.name,
o.name,
c.column_id,
c.name,
case when c.system_type_id in (165, 167, 231) and c.max_length = -1 then t.name + '(Max)' else t.name end,
c.precision,
case (c.max_length) when -1 then 0 else case when c.system_type_id in (99, 231, 239) then (c.max_length/2) else (c.max_length) end end as colnA,
c.scale,
case(c.is_computed) when 1 then convert(varchar(8000), (select z.definition from [%CATALOG%.]sys.computed_columns z where z.object_id = c.object_id and z.column_id = c.column_id)) else '' end as colnB,
case(c.is_nullable) when 1 then 'NULL' else 'NOTNULL' end,
case(c.is_identity) when 1 then 'identity' else '' end,
case when(c.user_type_id <> c.system_type_id) then (select d.name from [%CATALOG%.]sys.types d where d.user_type_id = c.user_type_id) else '' end as colnC,
convert(varchar(8000), d.definition),
case (c.is_identity) when 1 then convert(varchar, i.seed_value) + ', ' + convert(varchar, i.increment_value) else '' end as colnD,
(select convert(varchar(8000), value) from ::fn_listextendedproperty(NULL, 'user', u.name, 'table', o.name, 'column', c.name) where name = 'MS_Description') as colnE,
c.collation_name,
case (i.is_not_for_replication) when 1 then 'true' else 'false' end,
d.name,
case(c.is_sparse) when 1 then 'true' else 'false' end,
case(c.is_filestream) when 1 then 'true' else 'false' end,
case(c.is_rowguidcol) when 1 then 'true' else 'false' end
from
[%CATALOG%.]sys.columns c
join [%CATALOG%.]sys.objects o on (o.object_id = c.object_id)
join [%CATALOG%.]sys.schemas u on (u.schema_id = o.schema_id)
join [%CATALOG%.]sys.types t on (t.user_type_id = c.system_type_id)
left outer join [%CATALOG%.]sys.identity_columns i on (i.object_id = c.object_id and i.column_id = c.column_id)
left outer join [%CATALOG%.]sys.default_constraints d on (d.object_id = c.default_object_id)
where
o.type in ('U', 'S', 'V')
[ and u.name = %.q:OWNER%]
[ and o.name=%.q:TABLE%]
order by 1, 2, 3
注意该值中上面是PDM对应的列名，下面是从SQL数据库中取到的相关属性值。其中“
(select convert(varchar(8000), value) from
::fn_listextendedproperty(NULL, 'user', u.name, 'table', o.name, 'column', c.name)
where name = 'MS_Description') as colnE,
”是可以取到Comment值的，可是生成的PDM为什么Comment列为空呢？尝试修改该SQL语句，将语句提取出来，也可以获取结果：
View Code
select
u.name,
o.name,
c.column_id,
c.name,
case when c.system_type_id in (165, 167, 231) and c.max_length = -1 then t.name + '(Max)' else t.name end,
c.precision,
case (c.max_length) when -1 then 0 else case when c.system_type_id in (99, 231, 239) then (c.max_length/2) else (c.max_length) end end as colnA,
c.scale,
case(c.is_computed) when 1 then convert(varchar(8000), (select z.definition from sys.computed_columns z where z.object_id = c.object_id and z.column_id = c.column_id)) else '' end as colnB,
case(c.is_nullable) when 1 then 'NULL' else 'NOTNULL' end,
case(c.is_identity) when 1 then 'identity' else '' end,
case when(c.user_type_id <> c.system_type_id) then (select d.name from sys.types d where d.user_type_id = c.user_type_id) else '' end as colnC,
convert(varchar(8000), d.definition),
case (c.is_identity) when 1 then convert(varchar, i.seed_value) + ', ' + convert(varchar, i.increment_value) else '' end as colnD,
(select convert(varchar(8000), value) from ::fn_listextendedproperty(NULL, 'user', u.name, 'table', o.name, 'column', c.name) where name = 'MS_Description') as colnE,
c.collation_name,
case (i.is_not_for_replication) when 1 then 'true' else 'false' end,
d.name,
case(c.is_sparse) when 1 then 'true' else 'false' end,
case(c.is_filestream) when 1 then 'true' else 'false' end,
case(c.is_rowguidcol) when 1 then 'true' else 'false' end
from
sys.columns c
join sys.objects o on (o.object_id = c.object_id)
join sys.schemas u on (u.schema_id = o.schema_id)
join sys.types t on (t.user_type_id = c.system_type_id)
left outer join sys.identity_columns i on (i.object_id = c.object_id and i.column_id = c.column_id)
left outer join sys.default_constraints d on (d.object_id = c.default_object_id)
where
o.type in ('U', 'S', 'V')
and u.name =N'dbo'
and o.name=N'Age'
order by 1, 2, 3
后来发现，直接用生成表的SQL，而不是用数据库就可以生成注释。如下图：
但字段类型全乱了。
难道Powerdesigner真的这么弱吗？google了一下，看到官方文档：
http://manuals.sybase.com/onlinebooks/group-pd/pdd1100e/advanced/@Generic__BookTextView/1302;hf=0
里面有关于SqlListQuery的解释。
再看看上面的SQL语句，突然想到，既然可以在SQL查询出结果，那么出错一定在生成PDM的时候，
在SQL_2008_MyDefine::Script\Objects\Column中看到这么一段:
The following system variables are available:
(parent table items are also available for columns)
"COLNNAME" // name of the column
"COLNCODE" // code of the column
将上面的Value值中上面的一行中“Comment”修改为“COLNNAME”会如何？即
{OWNER, TABLE, S, COLUMN, DTTPCODE, LENGTH, SIZE, PREC, COMPUTE, NOTNULL, IDENTITY, DOMAIN, DEFAULT, ExtIdentitySeedInc, COMMENT, ExtCollation, ExtIdtNotForReplication, ExtDeftConstName, Sparse, FileStream, ExtRowGuidCol}改为
{OWNER, TABLE, S, COLUMN, DTTPCODE, LENGTH, SIZE, PREC, COMPUTE, NOTNULL, IDENTITY, DOMAIN, DEFAULT, ExtIdentitySeedInc, COLNNAME, ExtCollation, ExtIdtNotForReplication, ExtDeftConstName, Sparse, FileStream, ExtRowGuidCol}
结果生成如下：
同理将SQL_2008_MyDefine::Script\Objects\Table\SqlListQuery下的Value的第一行中
{OWNER, TABLE, TABLE_TYPE, Comment}的Comment改为{OWNER, TABLE, TABLE_TYPE, TNAME}
生成结果，如下：
至此，我的基本目的，已经达到了，虽然没有直接生成Comment列，但可以通过以下vbs脚本，从Name列生成Comment列：
'代码一:将name生成comment的脚本
View Code
Option Explicit
ValidationMode = True
InteractiveMode = im_Batch
Dim mdl 'the current model
'get the current active model
Set mdl = ActiveModel
If (mdl Is Nothing) Then
MsgBox "There is no current Model"
ElseIf Not mdl.IsKindOf(PdPDM.cls_Model) Then
MsgBox "The current model is not an Physical Data model."
Else
ProcessFolder mdl
End If
'This routine copy name into code for each table, each column and each view
'of the current folder
Private sub ProcessFolder(folder)
Dim Tab 'running table
for each Tab in folder.tables
if not tab.isShortcut then
tab.comment = tab.name
Dim col 'running column
for each col in tab.columns
col.comment= col.name
next
end if
next
Dim view 'running view
for each view in folder.Views
if not view.isShortcut then
view.comment = view.name
end if
next
'go into the sub-packages
Dim f 'running folder
For Each f In folder.Packages
if not f.IsShortcut then
ProcessFolder f
end if
Next
end sub
仔细思索：为什么从SQL生成的脚本有Comment,可是到生成PDM时为什么没有转化成功呢？是否Comment名称不对应？
于是将原来的COMMENT加上COLNNAME，同时在下面的SQL语句中增加一列与COMMENT相同的值：
(select convert(varchar(8000), value) from ::fn_listextendedproperty(NULL, 'user', u.name, 'table', o.name, 'column', c.name) where name = 'MS_Description') as colnF,
如下图：
这样，Name列和Comment同时生成，终于OK！
