[英]Use a stored procedure in entity framework
I have a model-first EF model. 我有一个模型优先的EF模型。 I just imported the first stored procedure: cpas_POIDVendorProjectDate
我刚刚导入了第一个存储过程: cpas_POIDVendorProjectDate
I imported it as a function. 我将其导入为函数。 It has three input parameters: @ProjectID(int)
, @VendorID(int)
, and @Workdate(datetime)
, and returns @POID(int)
. 它具有三个输入参数: @ProjectID(int)
, @VendorID(int)
和@Workdate(datetime)
,并返回@POID(int)
。
Here's the SQL code: 这是SQL代码:
CREATE PROCEDURE [dbo].[cpas_POIDVendorProjectDate]
@VendorID int,
@ProjectID int,
@WorkDate datetime,
@PO_ID int OUTPUT
AS
BEGIN
SET NOCOUNT ON;
DECLARE @RowCount int;
SELECT @PO_ID = ID FROM tblPO WHERE
VendorID = @VendorID
AND ExpirationDate >= @WorkDate
AND (ProjectID IS NULL OR ProjectID = @ProjectID)
AND CapitalExpense = (
SELECT CapitalExpense FROM tblProjects WHERE ID=@ProjectID)
AND GroupCode in (1,3,5);
SET @RowCount = @@RowCount;
IF (@RowCount != 1)
SET @PO_ID = -1*@RowCount;
END
I called it in my c# program as follows: 我在c#程序中按如下方式调用它:
context.cpas_POIDVendorProjectDate(
currVendorID, currProjectID, currWorkDate, currPOID);
Intellisense says my use of "context" is wrong...It's a "variable", and I'm using it as a "method". Intellisense说我对“上下文”的使用是错误的……这是一个“变量”,我将其用作“方法”。
In addition, currPOID
is rejected because it's looking for a system.data.objects.OjbectParameter
, not an int
. 另外, currPOID
被拒绝,因为它正在寻找system.data.objects.OjbectParameter
,而不是int
。 Intellisense is happy with the function name and other parameters (strangely...) Intellisense对函数名称和其他参数感到满意(奇怪的是...)
What am I doing wrong here? 我在这里做错了什么?
You can always do this if nothing else works: 如果没有其他效果,您可以始终这样做:
using(var context = new MyDataContext())
{
using(var cmd = context.Database.Connection.CreateCommand())
{
cmd.CommandText = "cpas_POIDVendorProjectDate";
cmd.CommandType = CommandType.StoredProcedure;
//if the stored proc accepts params, here is where you pass them in
cmd.Parameters.Add(new SqlParameter("VendorId", 10));
cmd.Parameters.Add(new SqlParameter("ProjectId", 12));
cmd.Parameters.Add(new SqlParameter("WorkDate", DateTimw.Now));
var poid = (int)cmd.ExecuteScalar();
}
}
If you would like an object orientated way, then Mindless passenger has a project that allows you to call a stored proc from entity frame work like this.... 如果您想要一种面向对象的方式,那么Mindless passenger有一个项目可以让您从这样的实体框架中调用存储的proc。
using (testentities te = new testentities())
{
//-------------------------------------------------------------
// Simple stored proc
//-------------------------------------------------------------
var parms1 = new testone() { inparm = "abcd" };
var results1 = te.CallStoredProc<testone>(te.testoneproc, parms1);
var r1 = results1.ToList<TestOneResultSet>();
}
... and I am working on a stored procedure framework ( here ) which you can call like in one of my test methods shown below... ...并且我正在开发一个存储过程框架 ( 在这里 ),您可以像下面显示的一种测试方法中那样调用它...
[TestClass]
public class TenantDataBasedTests : BaseIntegrationTest
{
[TestMethod]
public void GetTenantForName_ReturnsOneRecord()
{
// ARRANGE
const int expectedCount = 1;
const string expectedName = "Me";
// Build the paraemeters object
var parameters = new GetTenantForTenantNameParameters
{
TenantName = expectedName
};
// get an instance of the stored procedure passing the parameters
var procedure = new GetTenantForTenantNameProcedure(parameters);
// Initialise the procedure name and schema from procedure attributes
procedure.InitializeFromAttributes();
// Add some tenants to context so we have something for the procedure to return!
AddTenentsToContext(Context);
// ACT
// Get the results by calling the stored procedure from the context extention method
var results = Context.ExecuteStoredProcedure(procedure);
// ASSERT
Assert.AreEqual(expectedCount, results.Count);
}
}
internal class GetTenantForTenantNameParameters
{
[Name("TenantName")]
[Size(100)]
[ParameterDbType(SqlDbType.VarChar)]
public string TenantName { get; set; }
}
[Schema("app")]
[Name("Tenant_GetForTenantName")]
internal class GetTenantForTenantNameProcedure
: StoredProcedureBase<TenantResultRow, GetTenantForTenantNameParameters>
{
public GetTenantForTenantNameProcedure(
GetTenantForTenantNameParameters parameters)
: base(parameters)
{
}
}
If either of those two approaches are any good? 这两种方法中的任何一种是否有用?
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