Question

I currently have a linked server that I am querying in a stored procedure. I have the query working just fine currently however this query will need to change for every branch of code I have. I would like to know what the best method is for derriving the database name I am calling in the cross server query.

Ex:
Server A has a link to server B. Server A contains 3 databases. SRV_A.DB1_DEV, SRV_A.DB2_Trunk, SRV_A.DB3_Prod Each are linked to their Server B counterpart… SRV_B.DB1_DEV, SRV_B.DB2_Trunk, SRV_B.DB3_Prod

Each database on Server A has the same stored procedure. The only thing that changes in the sproc is the cross server select. So SRV_A.DB1_Dev has a select in the sproc that reads:

SELECT foo FROM [SRV_B].[DB1_DEV].[foo_table] WHERE bar = 1 

while the stored procedure on the trunk branch would be

SELECT foo FROM [SRV_B].[DB2_Trunk].[foo_table] WHERE bar = 1

Since I would like to have a VS project that will deploy the DB to every branch mentioned I would like to be able to fill in the database name dynamically. The solution I have came up with that is working is to use a series of IF checks with the CHARINDEX function, and then create the query with dynamic SQL, like this:

DECLARE @dSql NVARCHAR(4000);
DECLARE @databaseName NVARCHAR(100) = DB_NAME();
DECLARE @tableName NVARCHAR(100);
IF SELECT CHARINDEX('Dev', @databaseName, 0)
    SET @tableName = '[SRV_B].[DB1_DEV].[foo_table]
    ...Same if & set for Trunk
    ...Same if & set for Prod
SET @dSql = 'DECLARE @retID INT;SELECT foo FROM ' + @tableName 
+ ' WHERE bar = 1';SET @retID = SELECT SCOPE_IDENTITY()'
EXEC(@dSQL);

I would have to imagine there is a better solution though, if anyone can help me with one, it would be much appreciated. If by some outside shot this is the best way let me know as well.

Thanks,
James

Answer 1

I was able to use a combination of enviornment variables as mentioned above for the db-name, and also dynamically generate the SRV name as well by using the following query:

DECLARE @ServerName NVARCHAR(100);
SET @ServerName = (SELECT name FROM sys.servers WHERE server_id = 1)