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I don't get it. What are you searching for. The docs for that function?

DB_ID
Returns the database identification (ID) number.

Syntax
DB_ID ( [ 'database_name' ] )

Arguments
'database_name'

Is the database name used to return the corresponding database ID. database_name is nvarchar. If database_name is omitted, the current database ID is returned.

Return Types
smallint