[英]SQL Server : Stored Procedure for Preventing Duplicated Values
I have this code which I have created which I want to stop any duplicated values from being inserted into the database, however the values still continue to be able to get into the IF_Translations
table.我有我创建的这段代码,我想阻止任何重复的值插入到数据库中,但是这些值仍然能够继续进入IF_Translations
表。 I have tried changing the 0 to a -1 on this line:我曾尝试在这一行将 0 更改为 -1:
IF (SELECT COUNT(*) FROM IF_TRANSLATIONS WHERE INVALUE = @INVALUE) = 0
Any help?有什么帮助吗?
Code:代码:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[translationduplicate]
AS
SET NOCOUNT ON;
DECLARE @ID INT, @TRANSLATE_ID VARCHAR(15), @INVALUE VARCHAR(15),
@OUTVALUE VARCHAR(15), @CONV_DIRECTION VARCHAR(5),
@PLANT_ID VARCHAR(5), @LMOD DATETIME
IF (SELECT COUNT(*) FROM IF_TRANSLATIONS WHERE INVALUE = @INVALUE) = 0
BEGIN
INSERT INTO IF_TRANSLATIONS(ID, TRANSLATE_ID, INVALUE, OUTVALUE, CONV_DIRECTION, PLANT_ID)
VALUES((SELECT MAX(ID)FROM [OPERATOR_LIVE_43].[dbo].[IF_TRANSLATIONS]) + 1, @TRANSLATE_ID, @INVALUE, @OUTVALUE, 3, @PLANT_ID)
END
The correct solution is to let the database check the integrity.正确的解决办法是让数据库检查完整性。 You would do this with a unique constraint or index (the two are equivalent for this purpose):您可以使用唯一约束或索引来执行此操作(出于此目的,两者是等效的):
alter table if_translations add constraint unq_if_translations_invalue
unique (invalue);
You should also fix the ID
so it is an IDENTITY
column -- incrementing the value in your code is not safe, unless you lock the entire table and that is quite expensive.您还应该修复ID
,使其成为IDENTITY
列——增加代码中的值是不安全的,除非您锁定整个表并且这非常昂贵。
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