MsSql server:running 存储过程

Question

我有一个table

CREATE TABLE [dbo].[DealerInfo](
    [DealerName] [nvarchar](100) NULL,
    [Address] [nvarchar](100) NULL,
    [City] [nvarchar](100) NULL,
    [County] [nvarchar](100) NULL,
    [Fax] [nvarchar](50) NULL,
    [CompanyWebSite] [nvarchar](max) NULL,
    [EmailAddress] [nvarchar](100) NULL,
    [Currency] [nvarchar](20) NULL,
    [LicenceID] [int] NULL,
    [TaxRegistration] [int] NULL,
    [Phone] [nvarchar](50) NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

还有一个问题，当我尝试插入一个货币值时，它报告说它需要一个整数值

我使用存储过程插入值

ALTER PROCEDURE [dbo].[DealerInformation]
    -- Add the parameters for the stored procedure here
    @DealerName nvarchar(100),
    @Address nvarchar(100),
    @City nvarchar (100),
    @County nvarchar (100), 
    @Phone nvarchar (100),
    @Fax nvarchar(50),
    @CompanyWebSite nvarchar (100),
    @EmailAddress nvarchar(Max),
    @Currency nvarchar(20),
    @LicenceID int,
    @TaxRegistration int
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    Insert into DealerInfo values (@DealerName, @Address, @City, @County, @Phone, @Fax, @CompanyWebSite,@EmailAddress,@Currency,@LicenceID,@TaxRegistration)

货币应该是一个字符串值，如 USD、CAD、EUR 等

当我执行存储过程时，这是我得到的错误

Msg 245, Level 16, State 1, Procedure DealerInformation, Line 26 [Batch Start Line 2]
Conversion failed when converting the nvarchar value 'USD' to data type int.


using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=CarDealership;Integrated Security=True") )
            {
                conn.Open();

                SqlCommand cmd = new SqlCommand("DealerInformation", conn);

                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("DealerName", dealership.DealershipName);
                cmd.Parameters.AddWithValue("Address", dealership.Address);
                cmd.Parameters.AddWithValue("City", dealership.City);
                cmd.Parameters.AddWithValue("County", dealership.Country);
                cmd.Parameters.AddWithValue("Phone", dealership.Telephone);
                cmd.Parameters.AddWithValue("Fax", dealership.Fax);
                cmd.Parameters.AddWithValue("CompanyWebSite", dealership.CompanyWebSite);
                cmd.Parameters.AddWithValue("EmailAddress", dealership.Email);
                cmd.Parameters.AddWithValue("Currency", dealership.Currency); //The currency is string type
                cmd.Parameters.AddWithValue("LicenceID", dealership.LicenceID);
                cmd.Parameters.AddWithValue("TaxRegistration", dealership.TaxRegistration);

                int RowsAffected = cmd.ExecuteNonQuery();
                return RowsAffected;

            }

Answer 1

您正在使用 INSERT INTO 语句，但未指定字段名称。
因此，您的参数应该按照 table

中字段名称的相同顺序列出

现在，数据库引擎正在使用这些参数设置字段

[DealerName]  = @DealerName, 
[Address] = @Address
[City] = @City
[County] = @County
[Fax] = @Phone 
[CompanyWebSite] = @Fax 
[EmailAddress] = @CompanyWebSite
[Currency] = @EmailAddress,
[LicenceID] = @Currency,
[TaxRegistration]  = @LicenceID
[Phone] = @TaxRegistration

如您所见，您的 LicenceID 字段（一个 int）接收 @Currency 参数的值（一个 nvarchar）。
这是错误的原因，解决方法是始终在 INSERT INTO 语句中指定字段名称，并以正确的顺序列出参数以设置关联的字段。

Insert into DealerInfo 
   (DealerName, Address, City, County, Fax, CompanyWebSite,
   EmailAddress,Currency,LicenceID,TaxRegistration,Phone)
values (@DealerName, @Address, @City, @County, @Fax, @CompanyWebSite,
   @EmailAddress,@Currency,@LicenceID,@TaxRegistration, @Phone)

Answer 2

对我来说，您的 table 定义和存储过程代码似乎不同步。那就是你的 table 定义列数据类型 currency 实际上是 int，但不知何故你在编辑器中将它更改为 nvarchar。

要解决此问题，请右键单击您的 table 并检查您 table 的定义（而不是您在编辑器 window 中的代码），您将得到答案.

希望对你有所帮助。谢谢

MsSql server:running 存储过程

MsSql server:running stored procedure

c#

sql-server-2016-express