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Remove constraint from VFP app
Message
Information générale
Forum:
Microsoft SQL Server
Catégorie:
Autre
Divers
Thread ID:
01639883
Message ID:
01639887
Vues:
52
>>Hi,
>>
>>The SQL Database has a constraint that I see (in SSMS) in Keys and Indexes. I need to remove this contraint and replace it with another.
>>
>>For example,
>>Constraint name IX_CATEGORY_UNIQUE is as follows:
>>
>>ALTER TABLE [dbo].[MyTable] ADD  CONSTRAINT [IX_CATEGORY_UNIQUE] UNIQUE NONCLUSTERED 
>>(
>>	[CATEGORY] ASC
>>)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = 
>>OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
>>GO
>>
>>
>>I want to find it an replace with [SITE_NO],[CATEGORY]
>>
>>The first step is to find and drop it. What is the SQL Select to exececute from VFP?
>>
>>TIA
>
>
>TEXT TO lcSQL NOSHOW
>     ALTER TABLE [dbo].[MyTable] DROP CONSTRAINT [IX_CATEGORY_UNIQUE]
>ENTEXT
>IF SQLEXECT(sqlHandler, lcSQL)  < 0
>   AERROR(laError)
>   MessageBox(laError[1,2])
>   RETURN
>ENDIF
>
>TEXT TO lcSQL NOSHOW
>ALTER TABLE [dbo].[MyTable] ADD  CONSTRAINT [IX_CATEGORY_UNIQUE] UNIQUE NONCLUSTERED 
>(
>	[SITE_NO],[CATEGORY]
>)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = 
>OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
>ENDTEXT
>IF SQLEXECT(sqlHandler, lcSQL)  < 0
>   AERROR(laError)
>   MessageBox(laError[1,2])
>ENDIF
>
Thank you very much for your code. I usually run this code on program update (which is done not often but still somewhat a repeat procedure). And I want to avoid having to run this code every time. So I would probably name the second constraint (on SITE_NO, CATEGORY) a little different. For example, IX_TABLE_CATEGORY_UNIQUE. But in this case, what happens when I run this code the 2nd time and the constraint IX_CATEGORY_UNIQUE does not exist and still the code tries to drop it. Then, there will be an error.
This is why I thought that before DROP the code would check if the constraint exist. Does it make sense?
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
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