在LINQtoSQL SQLite的自动增量列映射处理 [英] Dealing with SQLite Autoincrement column mapping in LINQtoSQL

问题描述

我已经如下因素实体

    [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 被映射为自动增量INTEGER类型列（实际上的唯一一种可以在SQLite的自动增量）

ID is mapped to Autoincrement INTEGER type column (actually the only type possible with autoincrement in SQLite)

当我尝试添加一个新用户到DB这样，我得到一个错误：

When I try to add a new user to DB like this, I get an error:

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;

}

修改
A后，谷歌搜索并检查，似乎根本的SQLite没有提供任何 SCOPE_IDENTITY（）功能。但是，LINQ to SQL的注入呢！

EDIT After a googling for and checking, seems that SQLite simply doesn't provide any SCOPE_IDENTITY() function. But Linq To SQL injects it!

我怎样才能改变呢？

推荐答案

其实，有没有被我发现的解决方案来解决这个问题，如果没有一个建筑1 =>更改LINQ查询来改变输出SQL。

Actually there is no solution found by me to resolve this issue, if not that one architectural one => Change linq query to change outputted SQL.

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