Query that will apply to EVERY SQL Server database - sql

Question

I'm testing a drop database query for all databases that begin with a specific prefix. However, because that can easily lead to horrific things I'm taking my drop database query
declare #dbname nvarchar (200);
declare #query nvarchar (max);
DECLARE db_cursor CURSOR FOR
select name from sys.databases
where name like 'PREFIX%'
Open db_cursor
fetch next from db_cursor into #dbname
while ##FETCH_STATUS = 0
BEGIN
set #query = 'Drop Database ['+ #dbname + ']'
Exec(#query)
FETCH NEXT FROM db_cursor INTO #dbname
END
Close db_cursor
deallocate db_cursor
and want to change the Drop Database part to something that is less scary.
So MAIN QUESTION is there a simple SQL query that I could put in there that would always apply to any SQL Server database? So I know that this query will only affect the databases I want it to before switching it back to Drop Database?
EDIT: Better yet, a query that will return the names of the databases.
Like select name from sys.databases but one that will work with ['+ #dbname + '] to return only the names of databases with that prefix to ensure that this query affects the appropriate databases.

Answer 1

Instead of Exec(#query), just call PRINT #query. That will show you the SQL that you intend to run.
PRINT Documentation

Answer 2

First of all just execute the following query and it will tell you what databases will it bring forward in the rest of the code
select name from sys.databases
where name like 'PREFIX%'
Finally add a PRINT statement to see the final DROP DATABASE statements dynamically build inside the cursor.
Some minor improvement in your code:
declare #dbname SYSNAME;
declare #query nvarchar (max);
DECLARE db_cursor CURSOR LOCAL FORWARD_ONLY FOR
select name from sys.databases
where name like 'PREFIX%'
Open db_cursor
fetch next from db_cursor into #dbname
while (##FETCH_STATUS = 0)
BEGIN
set #query = 'Drop Database '+ QUOTENAME(#dbname)
--Exec sp_executesql #query --<-- For execution
-- PRINT #query --<-- For debugging
FETCH NEXT FROM db_cursor INTO #dbname
END
Close db_cursor
deallocate db_cursor