将变量声明为DbMigration.CreateStoredProcedure

Question

我尝试使用DbMigration.CreateStoredProcedure创建一个取整数InvoiceId并返回小数的函数。但是，当我应用迁移时，我收到此错误：

  

必须声明标量变量＆＃34; @ InvoiceId＆＃34;。

这是EF迁移代码：

CreateStoredProcedure("SumInvoiceTransactions", b => b.Decimal(9, 2),
    "RETURN (SELECT SUM(Amount) FROM Transactions WHERE InvoiceId=@InvoiceId)");

这是等效的SQL代码：

CREATE FUNCTION SumInvoiceTransactions(@InvoiceId int) RETURNS decimal
AS BEGIN
  RETURN (SELECT sum(Amount) FROM Transactions WHERE InvoiceId=@InvoiceId)
END

如何声明参数？

Answer 1

就像那样：

CreateStoredProcedure("SumInvoiceTransactions", c => new { InvoiceId = c.Int() },
"RETURN (SELECT SUM(Amount) FROM Transactions WHERE InvoiceId=@InvoiceId)");