How to use DB name as a generic variable in SQL?

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I want to set DB Name as a generic variable in SQL and DB Name being repeated. I am inserting data from one database to another in SQL. I want to avoid repeating DB Name for each insert into select from queries. My sample queries are below.

What I have tried:

My query is as below:

abc -DB Name, dbo-schema name and Test, Test1 are the tables in the insert into select from Query blocks

SQL

INSERT INTO abc.dbo.Test
(
	   [IN_300_FileID]
      ,[RecordVer]
)
select from dbo.Test (in_300_id,record) 

INSERT INTO abc.dbo.Test1
(
	   [IN_300_FileID]
      ,[RecordVer]
)
select from dbo.Test1 (in_300_id,record)

Posted 2-Feb-22 1:38am

Member 15421351

Updated 2-Feb-22 2:56am

Sean Ewington

v3

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OriginalGriff · Answer 1 · 2022-02-02T02:26:00

You can't use a variable in place of a DB name in any query string - it's processed at a different level, and just won't work.

The only way to do that would be to write a string in SQL that evaluated the DB name into the string, and then use EXEC to execute the string.

But a much better idea to to handle it in your presentation language when you create the string in the first place - add some "template" characters (like "{DBNAME} for example) and just use the PL string Replace function.

M Imran Ansari · Answer 2 · 2022-02-02T02:29:00

You can achieved through Dynamic SQL Query. Below is the sample query, you can modify it according to your needs:

DECLARE @TSQL AS NVARCHAR(500)
DECLARE @databaseName AS NVARCHAR(20) = 'DBName'

SET @TSQL = N' INSERT INTO [' + @databaseName + '].dbo.Test([IN_300_FileID],[RecordVer]) '
SET @TSQL = @TSQL + N' SELECT FROM dbo.Test (in_300_id,record) '
SET @TSQL = @TSQL + N' INSERT INTO [' + @databaseName + '].dbo.Test1([IN_300_FileID],[RecordVer]) '	   
SET @TSQL = @TSQL + N' SELECT FROM dbo.Test1 (in_300_id,record) '
PRINT(@TSQL)

PRINT Result:
INSERT INTO [DBName].dbo.Test([IN_300_FileID],[RecordVer])
SELECT FROM dbo.Test (in_300_id,record)
INSERT INTO [DBName].dbo.Test1([IN_300_FileID],[RecordVer])
SELECT FROM dbo.Test1 (in_300_id,record)
Finally execute you build query with EXEC sp_executesql @TSQL command.

Richard Deeming · Answer 3 · 2022-02-02T02:51:00

Solution 3

If you want to avoid repeating the three/four-part name, the simplest option would probably be to create synonyms for the tables you want to update:
Synonyms (Database Engine) - SQL Server | Microsoft Docs[^]

Posted 2-Feb-22 2:51am

Richard Deeming

How to use DB name as a generic variable in SQL?

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