在实体框架中使用存储过程
本文关键字:存储过程 实体 框架 | 更新日期: 2023-09-27 17:58:36
我有一个模型优先的EF模型。我刚刚导入了第一个存储过程:cpas_POIDVendorProjectDate
我将其作为函数导入。它有三个输入参数:@ProjectID(int)
、@VendorID(int)
和@Workdate(datetime)
,并返回@POID(int)
。
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
我在c#程序中这样称呼它:
context.cpas_POIDVendorProjectDate(
currVendorID, currProjectID, currWorkDate, currPOID);
Intellisense说我使用"上下文"是错误的。。。这是一个"变量",我把它当作一个"方法"。
此外,currPOID
被拒绝,因为它正在寻找system.data.objects.OjbectParameter
,而不是int
。Intellisense对函数名称和其他参数很满意(奇怪的是…)
我在这里做错了什么?
如果其他方法都不起作用,您总是可以这样做:
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();
}
}
如果你想要一种面向对象的方式,那么Mindless passenger有一个项目,可以让你从这样的实体框架中调用存储过程。。。。
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>();
}
我正在开发一个存储过程框架(这里),你可以像下面所示的我的一个测试方法一样调用它。。。
[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)
{
}
}
这两种方法中的任何一种都有好处吗?