关于PowerDesigner15不能从PDM图生成MS SQL2005/2008外键约束的问题
最近用PowerDesigner15做数据库设计的时候发现如果先做好了CDM图，然后生成PDM，再生成SQL 2005或SQL 2008脚本，发现始终无法生成外键约束。
我估计很多人都遇到了类似的问题。 经过查找和摸索终于解决了这个问题，现在将过程叙述如下，希望对大家有帮助。
实验过程如下：
1、生成在CDM中建立两个实体Entity_1和Entity_2，并建立关系Relationship。
2、自动生成MS SQL Server 2008的PDM。
3、选择DBMS类型为SQL 2008然后生成Database脚本
/*==============================================================*/
/* DBMS name: Microsoft SQL Server 2008 */
/* Created on: 2010/4/5 19:36:09 */
/*==============================================================*/
if exists (select 1
from sysobjects
where id = object_id('Entity_1')
and type = 'U')
drop table Entity_1
go
if exists (select 1
from sysindexes
where id = object_id('Entity_2')
and name = 'Relationship_1_FK'
and indid > 0
and indid < 255)
drop index Entity_2.Relationship_1_FK
go
if exists (select 1
from sysobjects
where id = object_id('Entity_2')
and type = 'U')
drop table Entity_2
go
/*==============================================================*/
/* Table: Entity_1 */
/*==============================================================*/
create table Entity_1 (
Attribute_1 int not null,
Attribute_2 int null,
constraint PK_ENTITY_1 primary key nonclustered (Attribute_1)
)
go
/*==============================================================*/
/* Table: Entity_2 */
/*==============================================================*/
create table Entity_2 (
Attribute_3 int not null,
Attribute_1 int null,
Attribute_4 int null,
constraint PK_ENTITY_2 primary key nonclustered (Attribute_3)
)
go
/*==============================================================*/
/* Index: Relationship_1_FK */
/*==============================================================*/
create index Relationship_1_FK on Entity_2 (
Attribute_1 ASC
)
go
从上面脚本可以看出没有生成需要的外键约束，只是生成了相关索引。
解决方法如下：
- 打开生成的PDM
- 将DBMS类型换为MS SQL 2000
- 在Model菜单中选择References命令，可以看到最后的Implementation被设置为Trigger
- 将Implementation被设置为Declarative(如果没有第二步就不能完成本步)
- 将DBMS类型换为MS SQL 2008
-
生成MS SQL 2008数据库生成脚本，能够正常生成需要的外键
/*==============================================================*/
/* DBMS name: Microsoft SQL Server 2008 */
/* Created on: 2010/4/5 19:49:25 */
/*==============================================================*/
if exists (select 1
from sys.sysreferences r join sys.sysobjects o on (o.id = r.constid and o.type = 'F')
where r.fkeyid = object_id('Entity_2') and o.name = 'FK_ENTITY_2_RELATIONS_ENTITY_1')
alter table Entity_2
drop constraint FK_ENTITY_2_RELATIONS_ENTITY_1
go
if exists (select 1
from sysobjects
where id = object_id('Entity_1')
and type = 'U')
drop table Entity_1
go
if exists (select 1
from sysindexes
where id = object_id('Entity_2')
and name = 'Relationship_1_FK'
and indid > 0
and indid < 255)
drop index Entity_2.Relationship_1_FK
go
if exists (select 1
from sysobjects
where id = object_id('Entity_2')
and type = 'U')
drop table Entity_2
go
/*==============================================================*/
/* Table: Entity_1 */
/*==============================================================*/
create table Entity_1 (
Attribute_1 int not null,
Attribute_2 int null,
constraint PK_ENTITY_1 primary key nonclustered (Attribute_1)
)
go
/*==============================================================*/
/* Table: Entity_2 */
/*==============================================================*/
create table Entity_2 (
Attribute_3 int not null,
Attribute_1 int null,
Attribute_4 int null,
constraint PK_ENTITY_2 primary key nonclustered (Attribute_3)
)
go
/*==============================================================*/
/* Index: Relationship_1_FK */
/*==============================================================*/
create index Relationship_1_FK on Entity_2 (
Attribute_1 ASC
)
go
alter table Entity_2
add constraint FK_ENTITY_2_RELATIONS_ENTITY_1 foreign key (Attribute_1)
references Entity_1 (Attribute_1)
go
（完）