我已经如下因素实体在LINQtoSQL
[Table(Name = "Users")]
public sealed class UserDB
{
private Int64 _id = -1;
private string _username = string.Empty;
public UserDB() { }
public UserDB(RepositoryInfo repoInfo)
{
UserName = repoInfo.Account;
}
[Column(Name = "ID", Storage = "_id", IsDbGenerated = true, IsPrimaryKey = true, UpdateCheck = UpdateCheck.Never)]
public Int64 ID { get { return _id; } set { _id = value; } }
[Column(Name = "UserName", DbType="nvarchar(50)", Storage = "_username")]
public string UserName { get { return _username; } set { _username = value; } }
}
ID被映射到自动增量INTEGER型柱(实际上与SQLite的自动增量的唯一类型可能)
当我尝试像这样向DB添加新用户,但出现错误:
public static Int64 AddUser(DataContext context, RepositoryInfo repoInfo)
{
UserDB udb = new UserDB(repoInfo);
//an ID of udb is -1, but I tried different values too, doesn't change result
var userstable = context.GetTable<UserDB>();
userstable.InsertOnSubmit(udb);
context.SubmitChanges(); // here I get a error, see on screen shot
return udb.ID;
}
编辑 一个google搜索和检查后,似乎SQLite的根本不提供任何SCOPE_IDENTITY()
功能。但Linq To SQL注入它!
我该如何改变这种情况?