我有以下存储过程:SQL存储Procudure没有返回值
USE [CW]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[addCustomer]
@firstname VARCHAR(50) = '',
@lastname VARCHAR(50) = '',
@email VARCHAR(50) = '',
@password VARCHAR(50) = ''
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
SELECT * FROM customer WHERE email = @email
IF (@@ROWCOUNT = 0)
BEGIN
-- Add to database.
INSERT INTO customer (firstname, lastname, email, [password])
VALUES (@firstname, @lastname, @email, @password);
SELECT @@IDENTITY;
END
ELSE
BEGIN
-- Don't add already registered
SELECT customer.customerID FROM customer WHERE email = @email;
END
END
这是给客户添加到表。如果他们的电子邮件已在表格中,则会返回该客户的ID。如果电子邮件不在表格中,则创建它并返回新的ID。
问题是,当它创建新记录时,它返回null。但是当我在Management Studio中执行sproc时,它会显示正确的返回值。
下面的代码:
SqlCommand cmd0 = new SqlCommand();
cmd0.Connection = conn;
cmd0.CommandType = CommandType.StoredProcedure;
cmd0.CommandText = "addCustomer";
cmd0.Parameters.AddWithValue("@firstname", firstname);
cmd0.Parameters.AddWithValue("@lastname", lastname);
cmd0.Parameters.AddWithValue("@email", email);
cmd0.Parameters.AddWithValue("@password", password);
var scaled = cmd0.ExecuteScalar();
customerID = scaled.ToString();
的customerID为空当电子邮件是独一无二的。
或者发电子邮件给PK:D和沟身份证 – 2011-06-09 22:13:26
无关你的问题,但在几乎所有情况下'@@ IDENTITY'是错误的,使用'scope_identity()'代替。如果每个触发器都添加到表中,则@ @ IDENTITY不会返回所期望的值。 '@@ IDENTITY':http://msdn.microsoft.com/en-us/library/ms187342.aspx'scope_identity()':http://msdn.microsoft.com/en-us/library/ms190315.aspx – 2011-06-09 23:12:05