在Microsoft Oslo SDK CTP 2008(使用Intellipad)中,以下代码编译良好:
module T {
type A {
Id : Integer32 = AutoNumber();
} where identity Id;
As : A*;
type B {
Id : Integer32 = AutoNumber();
// A : A;
// } where A in As && identity Id;
} where identity Id;
Bs : B*;
type C {
Id : Integer32 = AutoNumber();
B : B;
} where B in Bs && identity Id;
Cs : C*;
}
并导致以下Reach SQL输出:
set xact_abort on;
go
begin transaction;
go
set ansi_nulls on;
go
create schema [T];
go
create table [T].[As]
(
[Id] int not null identity,
constraint [PK_As] primary key clustered ([Id])
);
go
create table [T].[Bs]
(
[Id] int not null identity,
constraint [PK_Bs] primary key clustered ([Id])
);
go
create table [T].[Cs]
(
[Id] int not null identity,
[B] int not null,
constraint [PK_Cs] primary key clustered ([Id]),
constraint [FK_Cs_B_T_Bs] foreign key ([B]) references [T].[Bs] ([Id])
);
go
commit transaction;
go
但在更改模块T中的注释行后如下
A : A;
} where A in As && identity Id;
// } where identity Id;
显示错误消息“M2037:SQL生成内部错误:变量'A'缺少生成器”(在Intellipad的Reach SQL窗口中)。
任何想法?
问候,tamberg
答案 0 :(得分:1)
我认为你想要的是:
type A {
Id : Integer32 = AutoNumber();
} where identity Id;
As : A*;
type B {
Id : Integer32 = AutoNumber();
A : A;
} where identity Id;
Bs : (B where value.A in As)*;
type C {
Id : Integer32 = AutoNumber();
B : B;
} where identity Id && B in Bs;
Cs : (C where value.B in Bs)*;
请注意,约束是在外部,而不是这里的类型。当约束在类型上但不能深入到多个关系时,我能够获得类似的代码。将它们移动到externs似乎是正确的,并生成预期的Reach SQL。
答案 1 :(得分:0)