这是我正在使用的示例存储过程
CREATE PROCEDURE [dbo].[CreateCustomer]
@firstName nvarchar(50) = null,
@lastName nvarchar(50) = null,
@emailAddress nvarchar(50),
@contactNumber varchar(15) =null,
@street1 nvarchar(50) = null,
@street2 nvarchar(50) = null,
@city nvarchar(50) = null,
@State nvarchar(50)= null,
@Country nvarchar(50)=null,
@postalCode varchar(5) = null,
@middleName nvarchar(50),
@password nvarchar(50),
@membershipExpieryDate datetime,
@status int OUT
AS
BEGIN TRY
BEGIN TRANSACTION
SAVE TRANSACTION initialP
DECLARE @lastAccessed datetime = GETDATE()
DEClARE @uniqueCustomerID UNIQUEIDENTIFIER= NEWID()
BEGIN TRANSACTION
INSERT INTO Customers(CustomerID, FirstName, LastName, EmailAddress, LastAccessed, ContactNumber,
Street1, Street2, City, State, Country, PostalCode, MiddleName, Password, MembershipExpieryDate)
VALUES(@uniqueCustomerID,@firstName, @lastName, @emailAddress, @lastAccessed, @contactNumber, @street1, @street2,
@city, @State, @Country, @postalCode, @middleName, @password, @membershipExpieryDate)
INSERT INTO Roles(CustomersCustomerID,Role) VALUES(@uniqueCustomerID,'V')
COMMIT
SELECT CustomerID, FirstName, LastName, EmailAddress, LastAccessed, ContactNumber,
Street1, Street2, City, State, Country, PostalCode, MiddleName, MembershipExpieryDate FROM Customers WHERE EmailAddress = @emailAddress
SET @status =1
COMMIT
END TRY
BEGIN CATCH
IF(@@TRANCOUNT > 0)
BEGIN
ROLLBACK TRANSACTION initialP
END
SET @status =2
END CATCH
这是我用来获取查询数据的代码：
ObjectParameter status = new ObjectParameter("status", typeof(int));
var dataSet = Entity.CreateCustomer(newCustomer.FirstName, newCustomer.LastName,
newCustomer.EmailAddress, newCustomer.ContactNumber, newCustomer.Street1, newCustomer.Street2,
newCustomer.City, newCustomer.State, newCustomer.Country, newCustomer.PostalCode, newCustomer.MiddleName,
newCustomer.Password, newCustomer.MembershipExpieryDate, status);
但是当执行这个存储过程时，它会给出一个错误，说 Trans count 不匹配。据我所知，当 a 发生时，它会被 1归罪。trans count当 a发生时，它会被 1减刑。我已经在函数导入中映射了该函数，因为它可以返回一个复杂类型。begin transactioncommit
我无法理解这个问题。对我来说，这似乎还可以。我想知道天气我这样做是否正确与一些细节。谢谢。
编辑：这是我通过编写示例代码发现的。我首先认为是开始交易和提交。但事实并非如此。它允许选择甚至在提交语句之前插入的值（如果我错了，请纠正我。）。我创建了一个包含 3 列（test1 唯一标识符、test2 int、test3 int）的测试表，并创建了一个存储过程调用测试：它在下面给出：
CREATE PROCEDURE dbo.TestForCommit
(
@test11 int,
@test111 int,
@status int OUTPUT
)
AS
begin try
declare @test1 uniqueidentifier = NEWID()
begin transaction
insert into TestT1(Test1, Test11, Test111) values(@test1, @test11, @test111)
commit
select Test1, Test11, Test111 from TestT1 where Test1 = @test1
SET @status = 1
end try
begin catch
Rollback Transaction
set @status =2
end catch
/* SET NOCOUNT ON */
RETURN
我在实体模型中创建了一个功能导入，我像这样使用它：
ObjectParameter status = new ObjectParameter("status", typeof(int));
SchoolEntities test = new SchoolEntities();
var dataSet = test.TestForCommit(1, 1, status);
//A:
//(XXXXXXXXXXXXX)Console.WriteLine((int)status.Value);
foreach (var item in dataSet)
{
TestForCommit_Result t = item;
Console.WriteLine("{0} , {1} , {2}", t.Test1, t.Test11, t.Test111);
}
//B:
Console.WriteLine((int)status.Value);
Console.ReadLine();
这个 //A: 部分导致了问题。这给出了一个空引用异常。但是 //B: 部分正在工作并给出状态值。我仍在寻找为什么它会这样工作。谢谢！！