[英]How to use EntityFramework CodeFirstStoreFunctions nuget package?
I am trying to access an already existing function that is in my db. 我正在尝试访问数据库中已经存在的函数。 I want to execute this function from code first.
我想先从代码执行此功能。
Searching the net i found: 搜索我发现的网络:
https://codefirstfunctions.codeplex.com/ https://codefirstfunctions.codeplex.com/
My implementation of this: 我的实现:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<TrainMessage>()
.Property(e => e.Latitude)
.HasPrecision(18, 16);
modelBuilder.Entity<TrainMessage>()
.Property(e => e.Longitude)
.HasPrecision(18, 16);
modelBuilder.Entity<Stop>()
.Property(e => e.stop_lat)
.HasPrecision(18, 16);
modelBuilder.Entity<Stop>()
.Property(e => e.stop_lon)
.HasPrecision(18, 16);
modelBuilder.Entity<Order>()
.Property(e => e.Latitude)
.HasPrecision(18, 16);
modelBuilder.Entity<Order>()
.Property(e => e.Longitude)
.HasPrecision(18, 16);
modelBuilder.Entity<Subscription>()
.Property(e => e.StartTime)
.HasPrecision(0);
modelBuilder.Entity<Subscription>()
.Property(e => e.EndTime)
.HasPrecision(0);
modelBuilder.Entity<OrderLocation>()
.Property(e => e.Latitude)
.HasPrecision(18, 16);
modelBuilder.Entity<OrderLocation>()
.Property(e => e.Longitude)
.HasPrecision(18, 16);
modelBuilder.Entity<Order>()
.HasMany(e => e.OrderLocations)
.WithOptional(e => e.Order)
.HasForeignKey(e => e.Order_Id);
modelBuilder.Conventions.Add(new FunctionsConvention<TransitContext>("dbo"));
}
[DbFunction("TransitContext", "tvf_GetAllStopsInBetween")]
public IQueryable<int> GetAllStopsBetweenStations(int StopA_id, int StopB_id)
{
var A = new ObjectParameter("StopA_id", StopA_id);
var B = new ObjectParameter("StopB_id", StopB_id);
return ((IObjectContextAdapter)this).ObjectContext
.CreateQuery<int>("[dbo.tvf_GetAllStopsInBetween](@StopA_id, StopB_id)", A, B);
}
It is not exactly what they show in the guide but I have a function in the db and they create it in the code so I figure I do not need the rest of the code. 它们与指南中所显示的不完全相同,但是我在db中有一个函数,它们在代码中创建了它,因此我认为我不需要其余的代码。
I have two problems with this 我有两个问题
1) No matter what data I am trying to get from the db I get: 1)无论我试图从数据库中获取什么数据,我都会得到:
The argument 'name' cannot be null, empty or contain only white space.
参数“名称”不能为null,为空或仅包含空格。
2) When I remove this part of the code: 2)当我删除这部分代码时:
modelBuilder.Conventions.Add(new FunctionsConvention<TransitContext>("dbo"));
I get this: 我得到这个:
ErrorDescription = "'dbo.tvf_GetAllStopsInBetween' cannot be resolved into a valid type or function."
“ ErrorDescription =”'dbo.tvf_GetAllStopsInBetween'无法解析为有效的类型或函数。
Message = "'dbo.tvf_GetAllStopsInBetween' cannot be resolved into a valid type or function. Near escaped identifier, line 1, column 1."
Message =“'dbo.tvf_GetAllStopsInBetween'无法解析为有效的类型或函数。在转义的标识符附近,第1行,第1列。”
I am fairly new to codefirst and I inherited this code. 我对Codefirst相当陌生,我继承了此代码。
How do i solve this? 我该如何解决?
I also got 我也有
The argument 'name' cannot be null, empty or contain only white space.
参数“名称”不能为null,为空或仅包含空格。
when using the nuget package. 使用nuget包时。
I cloned the codeplex repo and used the source directly and that error went away. 我克隆了Codeplex存储库并直接使用源,该错误消失了。 I think the nuget is actually out of date
我认为nuget实际上已经过时了
created a SP instead of a TVF and used the following code and problem was solved: 创建了一个SP而不是TVF,并使用了以下代码,问题得以解决:
public ObjectResult<int> GetAllStopsBetweenStations(int StopA_id, int StopB_id)
{
var A = new SqlParameter("StopA_id", System.Data.SqlDbType.Int);
var B = new SqlParameter("StopB_id", System.Data.SqlDbType.Int);
A.Value = StopA_id;
B.Value = StopB_id;
return ((IObjectContextAdapter)this).ObjectContext.
ExecuteStoreQuery<int>("GetAllStopsInBetweenTest @StopA_id, @StopB_id ", A,B);
}
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