自动增加 SQL 值 [英] Auto Increment SQL Value
问题描述
在我现在工作的一家公司的全球 DBA 的无限智慧中,他创建了一个表,该表将一个 int 作为 ID 字段,但不会自动递增数字.
In the infinte wisdom of the global DBA at a firm I am working at right now he has created a table that takes an int as an ID field, but does not auto increment the number.
我正在从 .Net 传递一个表值参数,因为它有大约 100 行或更多行的数据在任何时候传递,我不想终止应用程序、破坏网络或 SQL Server.
I am passing up a table valued parameter from .Net because it has roughly 100 or more rows of data that are being passed up at any one time and I dont want to kill the application, hammer the network or the SQL Server.
这是我的存储过程
CREATE PROCEDURE sp_Insert_Supporting_Error_Info
(@tvp [dbo].udt_CEQZW READONLY)
as
begin
INSERT INTO CEQZW
ERROR_VAR_ID,
ERROR_ID,
ERROR_VAR_TYPE_CD,
ERROR_VAR_VALUE)
SELECT (SELECT coalesce(MAX(ERROR_VAR_ID), 0) + row_number() over (order by
(select NULL)) FROM CEQZW) as ERROR_VAR_ID,
ERROR_ID,
ERROR_VAR_TYPE_CD,
ERROR_VAR_VALUE FROM @TVP
end
go
我希望这个 SELECT coalesce(MAX(ERROR_VAR_ID), 0) + row_number() over (order by (select NULL)) FROM CEQZW
我用这个测试
I was hoping that this SELECT coalesce(MAX(ERROR_VAR_ID), 0) + row_number() over (order by (select NULL)) FROM CEQZW
would some how do the trick for me as when I test with this
declare @p3 dbo.udt_CEQZW
insert into @p3 values(1,N'es',N'test')
insert into @p3 values(1,N'ec',N'test')
insert into @p3 values(1,N'ec',N'test')
insert into @p3 values(1,N'ses',N'test')
insert into @p3 values(1,N'es',N'test')
exec sp_Insert_Supporting_Error_Info @p3
这就是我要回来的
(1 行受影响)
(1 行受影响)
(1 行受影响)
(1 行受影响)
(1 行受影响)消息 2627,级别 14,状态 1,过程 sp_Insert_Supporting_Error_Info,第 9 行违反 PRIMARY KEY 约束PK_CEQZW".无法在对象dbo.CEQZW"中插入重复键.重复的键值为 (1).声明已终止.
(1 row(s) affected) Msg 2627, Level 14, State 1, Procedure sp_Insert_Supporting_Error_Info, Line 9 Violation of PRIMARY KEY constraint 'PK_CEQZW'. Cannot insert duplicate key in object 'dbo.CEQZW'. The duplicate key value is (1). The statement has been terminated.
所以我的问题是,除了锤击网络、应用程序和 SQL Server 自动增量并将 ID 添加到表中之外,我该如何做
So the question I have is how would I, other than hammering the network, app and SQL Server auto increment and add the ID into the table
推荐答案
嗯,我会先去找你的 DBA,问他为什么决定不做 ID 列和标识.也许他会改变主意.
Well, I would start by going to your DBA and ask why he decided to not make the ID column and identity. Perhaps he will change his mind.
但是,如果他会保留这个决定,请不要尝试自己创建自动递增机制.
99.9% 的情况下它有可能失败,尤其是在多用户环境中.
相反,使用标识列的已经内置的线程安全方法.
If, however, he will keep this decision, do not attempt to create an auto-increment mechanism on your own.
99.9% of the cases it has a potential to fail, especially in a multi user environment.
Instead, use the already built in, thread safe method of an identity column.
由于我们讨论的是无法直接在目标表中使用标识列的情况,因此我建议使用 2012 版本中引入的序列对象的简单模拟来获得自动增量.
Since we are talking about a situation where you can't use an identity column directly in your target table, I would suggest using a simple mimic of the sequence object introduced in 2012 version to get you your auto increment.
为此,您需要一个计数(数字)表.如果您的 DBA 尚未创建,请让他阅读 Jeff Moden 的 The Numbers"或Tally"表:它是什么以及它如何替换循环,然后将他发送给 KM. 在 this SO post 用于创建脚本.(方法 7 是我最喜欢的.)
For this, you'll need a tally (numbers) table. If your DBA did not already create one, send him to to read Jeff Moden's The "Numbers" or "Tally" Table: What it is and how it replaces a loop and then send him to KM.'s answer on this SO post for the creation script. (Method 7 is my favorite.)
现在你有一个数字表,你添加一个非常简单的表:
Now that you have a numbers table, you add a very simple table:
CREATE TABLE tblSequence
(
Value int identity(1,1)
)
然后,您创建一个存储过程,该过程将向该表中插入任意数量的行并返回新创建的值(感谢 Martin Smith 在 这篇文章!):
Then, you create a stored procedure that will insert any number of rows into this table and returns the newly created values (Thanks to Martin Smith for the merge trick on this post!):
CREATE PROCEDURE stp_GetNextValues
(
@NumberOfValues as int
)
AS
MERGE INTO Sequence
USING (SELECT Number
FROM Tally
WHERE Number <= @NumberOfValues) T
ON 1 = 0
WHEN NOT MATCHED THEN
INSERT
DEFAULT VALUES
OUTPUT INSERTED.Value;
GO
然后每当您执行此存储过程时,您都会获得安全的自动递增值.
Then whenever you execute this stored procedure you'll get safe auto incremented values.
EXEC stp_GetNextValues 125
我让你把它合并到你自己的程序中.
I leave it up to you to incorporate this into your own procedure.
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