FreeTDS Development Group

[Igor Korot <ikorot01 AT gmail.com>]

Hi, Matthew,

On Wed, Jul 25, 2018 at 2:37 AM,  <matthew.green AT datamartcomputing.com> wrote:
> Hi Igor,
>
> Glad you got it sorted :-)
>
> I'm afraid I don't quite understand your follow up question about 
> schema/catalogue.
>
> Usually people use this kind of format for adding tables/indexes:
>
> If exists (....
>     drop table/index
> go
> create table/index
> go

Consider this scenario:

CREATE TABLE foo.test(<field_list>)
GO
CREATE TABLE bar.test(<field_list>)
GO
IF NOT EXCISTS (SELECT 1 FROM sysindexes WHERE id = object_id("test")
AND name = "I1")
      EXECUTE("CREATE INDEX I1 ON test (test)")

What will happen in this case?
How the server determine which test to use for verification?
And what if I add:

CREATE TABLE dbo.test(<field_list>)
GO

?

Thank you.

>
> Rarely, in my experience but sometimes they may wish to only create the 
> table/index if it doesn't already exist but that's already covered by the 
> examples we've exchanged.
>
> Which leads me to think that I'm not correctly understanding your question 
> :-)
>
> Cheers,
>
> Matt.
>
> July 24, 2018 7:44 PM, "Igor Korot" <ikorot01 AT gmail.com> wrote:
>
>> Hi, Matthew (and list),
>>
>> On Mon, Jul 23, 2018 at 11:34 AM, Igor Korot <ikorot01 AT gmail.com> wrote:
>>
>>> Hi, Matthew,
>>>
>>> On Mon, Jul 23, 2018 at 11:22 AM, <matthew.green AT datamartcomputing.com> 
>>> wrote:
>>>> Sorry Igor if I wasn't clear.
>>>>
>>>> I ran this from SAP's isql as your original e-mail seemed to me to be 
>>>> more a problem with getting
>>>> the command right than FreeTDS.
>>>
>>> Yes, you are correct. It is a syntax issue.
>>>
>>>> So, from isql and now on ASE 16 the following works (adopting more your 
>>>> syntax):
>>>>
>>>> if not exists (select 1 from sysobjects where name = "test" and type = 
>>>> "U")
>>>> exec("create table test (test int not null)")
>>>>
>>>> if not exists (select 1 from sysindexes where id = object_id("test") and 
>>>> name = "I1")
>>>> exec("create index I1 on test (test)")
>>>>
>>>> I ran it 20 times, obviously the first time when the table and index 
>>>> don't exist and the following
>>>> ones when it does :-)
>>>
>>> That's weird.
>>> Does this mean we have a bug in the freeTDS ODBC driver? Frediano?
>>>
>>> As I said - I ran it from the unixODBC DM and on the second try got
>>> "Could not SQLExecute".
>>
>> After inspecting my code more closely I found I was checking the
>> tempdb tables and not the actual ones.
>> Stupid me. ;-) I guess I needed a fresh pair of eyes or it was too late.
>>
>> But now I have a more interesting question.
>>
>> Is there a way to add catalog/schema to the "SELECT 1 FROM sysindexes..." 
>> query?
>>
>> Thank you.
>>
>>>> Cheers,
>>>>
>>>> Matt.
>>>>
>>>> July 23, 2018 5:20 PM, "Igor Korot" <ikorot01 AT gmail.com> wrote:
>>>
>>> Hi, Matthew,
>>>
>>> On Mon, Jul 23, 2018 at 9:31 AM, <matthew.green AT datamartcomputing.com> 
>>> wrote:
>>>
>>> This works for me on 15.7:
>>>
>>> create table test (test int not null)
>>>
>>> declare @i varchar(8000)
>>>
>>> select @i = "create index I1 on test (test)"
>>>
>>> if not exists (select 1 from sysindexes where id = object_id("test") and 
>>> name = "I1")
>>> exec(@i)
>>>
>>> How many times did you run it?
>>> When I tried to execute:
>>>
>>> IF NOT EXISTS(SELECT o.name, i.name FROM tempdb..sysobjects o,
>>> tempdb..sysindexes i WHERE o.id = i.id AND o.name='abcattbl' AND
>>> i.name='abcattbl_tnam_ownr') EXECUTE("CREATE INDEX abcattbl_tnam_ownr
>>> ON abcattbl(abt_tnam ASC, abt_ownr ASC)")
>>>
>>> when the index already been created, I got:
>>>
>>> "Could not SQLExecute"
>>>
>>> And I have Sybase 16.0 installed on Linux Gentoo.
>>> Tried the query on isql from unixODBC w/freeTDS driver.
>>>
>>> Thank you.
>>>
>>> Cheers,
>>>
>>> Matt.
>>>
>>> July 23, 2018 3:02 PM, "Igor Korot" <ikorot01 AT gmail.com> wrote:
>>>
>>> And following statement also fails:
>>>
>>> IF NOT EXISTS(SELECT o.name, i.name FROM tempdb..sysobjects o,
>>> tempdb..sysindexes i WHERE o.id = i.id AND o.name='abcattbl' AND
>>> i.name='abcattbl_tnam_ownr') EXECUTE("CREATE INDEX abcattbl_tnam_ownr
>>> ON abcattbl(abt_tnam ASC, abt_ownr ASC)")
>>>
>>> "Could not SQLExecute"
>>>
>>> Log says "Index already exists"
>>>
>>> Thank you.
>>>
>>> On Mon, Jul 23, 2018 at 5:57 AM, Igor Korot <ikorot01 AT gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> On Mon, Jul 23, 2018 at 2:48 AM, Frediano Ziglio <freddy77 AT gmail.com> 
>>> wrote:
>>> 2018-07-22 7:57 GMT+01:00 Igor Korot <ikorot01 AT gmail.com>:
>>>
>>> Hi, ALL,
>>> I'm trying to execute following query:
>>>
>>> query1 = L"IF NOT EXISTS(SELECT 1 FROM sysobjects WHERE name =
>>> 'abcatcol' AND type = 'U') CREATE TABLE abcatcol( <field_list>))";
>>>
>>> Unfortunately it fails.
>>> If the table does not exist I'm getting 100 (SQL_NO_DATA) from the ODBC
>>> driver.
>>> And if the table does exist, I'm getting -1 with the error:
>>>
>>> "The table already exists".
>>>
>>> Is there a way to do this in 1 shot? Or I will have to do a conditional
>>> for Sybase to make it in 2 queries?
>>>
>>> Please advise.
>>>
>>> Thank you.
>>> This works for mssql:
>>>
>>> if object_id('test123') is null create table test123(i int)
>>>
>>> What about this one:
>>>
>>> CREATE INDEX IF NOT EXISTS abcattbl_tnam_ownr ON abcattbl(\"abt_tnam\"
>>> ASC, \"abt_ownr\" ASC)
>>>
>>> ?
>>>
>>> It is on Sybase 16.
>>> It says "Syntax error on the 'IF'".
>>>
>>> Thank you.
>>>
>>> Frediano
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