Grant SQL Login db_owner when new database gets created

Hello Guys,

I have a doubt regarding granting database level roles to the created SQL Login on the newly created databases in our environment. Is it somehow possible to automate this?? Meaning my requirement is to grant the SQL login a database role (db_owner, db_datawriter, etc) to databases as soon as they are created.
As per my knowledge there are two ways:
1. Making changes to model: Not preferred since this will affect all the other databases as well.
2. Using DDL Trigger: This I prefer since we have certain naming conventions in our environment and this rule should be applied only to them.
Doing some research on the internet, I found this piece of code:

CREATE TRIGGER trg_DDL_CreateDatabase
DECLARE @databaseName sysname;
SET @databaseName = (SELECT EVENTDATA().value('(/EVENT_INSTANCE/DatabaseName)[1]', 'sysname'));
declare @sql nvarchar(max);
set @sql = N'USE ' + quotename(@databaseName) + N';
EXEC sp_addrolemember N''db_owner'', N''DOMAIN\SOMEGROUP''
EXEC sp_addrolemember N''db_owner'', N''DOMAIN\SOMEOTHERGROUP'';';
exec sp_executesql @sql;

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I did not try this since I want to add naming constraint to this query. I'm not well versed with triggers concept. Kindly help me on this and give your suggestions.
Eldo issacAsked:
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Deepak ChauhanSQL Server DBACommented:
Above script will also apply on all new datbases because there is no check for naming conventions.

I have modified the above and added two more variables. Change when you test the script.
Set @User ='Test'  --- This is for user name or group which you want to add.
Set @namingConv='DB_%'  -- This is for database naming conventions like db name start with "DB_"
Create TRIGGER trg_DDL_CreateDatabase
DECLARE @databaseName sysname;
Declare @User nvarchar(100);
Declare @namingConv varchar(50);
Set @User ='Test'
Set @namingConv='DB_%'
SET @databaseName = (SELECT EVENTDATA().value('(/EVENT_INSTANCE/DatabaseName)[1]', 'sysname'));
declare @sql nvarchar(max)

IF @databaseName like @namingConv
set @sql = N'USE ' + quotename(@databaseName) + CHAR(13)+CHAR(10)+N'
create user '+'['+@User+'] '+  'for login '+'['+@User+']'+CHAR(13)+CHAR(10) +
'EXEC sp_addrolemember N''db_owner'', N'''+@User+''''+CHAR(13)+CHAR(10)+
'print  ''user added in the database'''
Print 'Databaes  '+@databaseName +'  name does not match the naming convention or Login does not exist to add the user'
Exec sp_executesql @sql

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Scott PletcherSenior DBACommented:
Change the bold areas to match your specific data:

CREATE TRIGGER trg_DDL_CreateDatabase
DECLARE @databaseName varchar(128);
SET @databaseName = (SELECT EVENTDATA().value('(/EVENT_INSTANCE/DatabaseName)[1]', 'sysname'));
IF @databaseName LIKE '%<matching_db_name_pattern>%'
      DECLARE @sql_template varchar(8000);
      DECLARE @sql varchar(8000)
      SET @sql_template = 'USE [$db$]; ' +
            'IF NOT EXISTS(SELECT 1 FROM sys.database_principals dp WHERE = ''$user$'') ' +
            '    CREATE USER [$user$] FROM LOGIN [$user$]; ' +
            'EXEC sp_addrolemember ''db_owner'', ''$user$'' '
      SET @sql = REPLACE(REPLACE(@sql, '$db$', @databaseName), '$user$', '<add_your_user_name_here>')
      EXEC (@sql)
GO --end of trigger

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Microsoft SQL Server 2008

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