Abort due to constraint violation PRIMARY KEY must be unique

记录SQLite唯一主键的错误及解决方法，错误如标题中所示，违反了主键唯一性约束。

• 开发工具：VS 2010 EN
• 开发语言：Visual C#
• SQLite 3
• ADO.NET Entitry Framework
• ADO.NET 2.0 Provider for SQLite

简单设计表结构如下（Students）：

Id：integer primary key

在执行

SchoolEntities school = new SchoolEntities();

school.Students.AddObject(new Student { Name = "Tom" });
school.Students.AddObject(new Student { Name = "Jane" });
school.Students.AddObject(new Student { Name = "Rose" });
school.Students.AddObject(new Student { Name = "Maya" });
school.Students.AddObject(new Student { Name = "Maly" });
school.Students.AddObject(new Student { Name = "Marry" });
school.Students.AddObject(new Student { Name = "King" });
school.Students.AddObject(new Student { Name = "Jill" });
school.SaveChanges();

但在执行的时候出错以下错误：

解决方法如下：

1. 为每一个实体的Id提供不同的值

2. 在创建Id列时候设置为：INTEGER PRIMARY KEY AUTOINCREMENT

3. 手动更改Edmx（SSDL）文件，设置为：

 <Property Name="Id" Type="integer" Nullable="false" StoreGeneratedPattern="Identity" />