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check if database exist before restore


check if database exist before restore

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Robin35
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hi,

i'm in the process of automating the database restore using powershell....
but before getting the default paths of data and log files of an instance...i would like to check if database already exists or not ?

Please let me know how to get that information...

IF EXISTS (select d.name,f.physical_name from sys.master_files f, sys.databases d where f.database_id = d.database_id and d.name = 'Test_Restore')

select f.physical_name from sys.master_files f, sys.databases d where f.database_id = d.database_id and d.name = 'master'

before the restore i would like to check if db exist, if it's in it should generate the data and log file path . if it's not in we need to get default path of instance or master db path.
please let me know
Thanks in advance
Neeraj Dwivedi
Neeraj Dwivedi
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You are doing it right. What issue you are facing?

Instaed of if exists use "If NOT EXISTS"

Check for DB from sys. sysdatabases then get path from sys.master_files.
Robin35
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Thanks Neeraj..

i'm executing like this

IF NOT EXISTS (select d.name, f.physical_name from sys.master_files f, sys.sysdatabases d where f.database_id = d.dbid and
d.name = 'Test_Restore')

select f.physical_name from sys.master_files f, sys.databases d where f.database_id = d.database_id and
d.name = 'master'

i didnt get any output...
Neeraj Dwivedi
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Do you already have Database named Test_Restore?
Robin35
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yes its already in instance
Neeraj Dwivedi
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So, if already exists, it will not return anything from the second sql. Because you are checking for not exists?

I thought that you want the path for Master DB only if the Test_Restore doesn't exist.
Steve Jones
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The default data path is stored in the registry. Here are some answers, but it's the one that reads the registry that you want

http://stackoverflow.com/questions/1883071/how-do-i-find-the-data-directory-for-a-sql-server-instance

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Lynn Pettis
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Do not use sys.sysdatabases. It is a SQL Server 2000 system and is included for backward compatibility. You should use sys.databases instead.

Cool
Lynn Pettis

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Robin35
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thanks guys for the response...

my requirement has changed a bit...

i'm looking for something like this...

check if destination database exists, if it exists select physical location path ( data and log file )
else get the default instance path.

query to get the default instance path :

DECLARE @defaultDataLocation nvarchar(400)
DECLARE @defaultLogLocation nvarchar(400)

EXEC master.dbo.xp_instance_regread
N'HKEY_LOCAL_MACHINE',
N'Software\Microsoft\MSSQLServer\MSSQLServer',
N'DefaultData',
@defaultDataLocation OUTPUT

EXEC master.dbo.xp_instance_regread
N'HKEY_LOCAL_MACHINE',
N'Software\Microsoft\MSSQLServer\MSSQLServer',
N'DefaultLog',
@defaultLogLocation OUTPUT

SELECT @defaultDataLocation AS 'Default Data Location',@defaultLogLocation AS 'Default Log Location'

Please let me know the script...this is for database restore automation....so when we give the destination db parameters...it must check the db first....

thanks in advance
Robin35
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Neeraj Dwivedi (5/7/2013)
So, if already exists, it will not return anything from the second sql. Because you are checking for not exists?

I thought that you want the path for Master DB only if the Test_Restore doesn't exist.


Hi Neeraj,

you are correct when i put if exists i get master db....for if not exists i dont see anything...

but i'm looking in a different way...please see my latest post....

thanks for your time
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