Question

我不知道代码的哪一部分是错误的。

这是我的存储过程

ALTER PROCEDURE dbo.AddNewNews
(@title nvarchar(50),
 @text ntext,
 @year int,
 @month int,
 @day int,
 @id_writer int ,
 @id_subject1 int,
 @id_subject2 int,
 @id_subject3 int,
 @id_subject4 int,
 @id_subject5 int)
AS
  SET NOCOUNT ON

  BEGIN TRANSACTION;

     DECLARE @last_id_news int
     BEGIN TRY

        insert into news(title, text, year, month, day, id_writer)
        values(@title, @text, @year, @month, @day, @id_writer)

        set @last_id_news = SCOPE_IDENTITY()

if @id_subject1 is not null
begin
    insert into news_subject (id_news,id_subject) values (@last_id_news,@id_subject1)
end
if @id_subject2 is not null
begin
    insert into news_subject (id_news,id_subject) values (@last_id_news,@id_subject2)
end
if @id_subject3 is not null
begin
    insert into news_subject (id_news,id_subject) values (@last_id_news,@id_subject3)
end
if @id_subject4 is not null 
begin
    insert into news_subject (id_news,id_subject) values (@last_id_news,@id_subject4)
end
if @id_subject5 is not null
begin
    insert into news_subject (id_news,id_subject) values (@last_id_news,@id_subject5)
end

    COMMIT TRANSACTION;
END TRY
BEGIN CATCH

ROLLBACK TRANSACTION;
END CATCH;

RETURN

这就是我从C＃代码中将参数发送到存储过程的方法：

public bool AddNewNews(News news, List<object> subject)
{
    SqlParameter[] parameters = new SqlParameter[]
    {
        new SqlParameter ("@title", news.Id_news),
        new SqlParameter ("@text", news.Text),
        new SqlParameter ("@year", news.Year),
        new SqlParameter ("@month", news.Month),
        new SqlParameter ("@day", news.Day),
        new SqlParameter ("@id_writer", news.Id_writer),
        new SqlParameter ("@id_subject1", subject[0]),
        new SqlParameter ("@id_subject2", subject[1]),
        new SqlParameter ("@id_subject3", subject[2]),
        new SqlParameter ("@id_subject4", subject[3]),
        new SqlParameter ("@id_subject5", subject[4])
    };
    return SqlDBHelper.ExecuteNonQuery("AddNewNews", CommandType.StoredProcedure, parameters);
}

只是主题[i]可以为空

但我不知道它何时进入存储过程并检查id_subject是否为false或其他部分代码？

Answer 1

将参数更改为存储过程以具有默认值：

@id_subject1 int = null,
@id_subject2 int = null,
@id_subject3 int = null,
@id_subject4 int = null,
@id_subject5 int = null

Answer 2

＆＃34;只是主题[i]可以为null，但我不知道它何时进入商店程序并检查id_subject是否为false或其他部分代码？＆＃34;

如果我理解正确，那么这些subject[i]值可能是null。传递值null不起作用 - 该值不会被正确传递。

相反，请将参数发送到存储过程，如下所示：

new SqlParameter ("@id_subject3",subject[2] ?? DBNull.Value)

将参数发送到存储过程

2 个答案: