Database version - sql

Question

I have to write a procedure which is able using a Table version to bring the database to a specific moment in type. For instance to move from version 1 to version 10 or the other way around. The thing is I'm pretty blurry with this chapter, and the school course has almost nothing about it. I tried using the internet to build a solution but somehow I got stuck. Please help me understand what am I doing wrong.
Table version, 1 columnm, type int
query
create procedure [dbo].[goto_vs] (
#vs int
)
as
begin
declare #current_vs int, #counter int;
declare #sqlquery nvarchar(50); --query to modify
declare #sqlsp nvarchar(30);
declare #sqlversion nvarchar(3);
declare #sqlreverse nvarchar(10);
--get the current version from table
select #current_vs=version from dbo.version;
--checking for valid version
if (#current_vs = #vs) begin
print('The database is already at this version...')
return
end
else begin
if (#vs > 5) begin
print('Setting the version of databse to last one...')
set #vs = 5
end
else begin
if (#vs < 0) begin
print('Setting the database to default...')
set #vs = 0
end
end
end
--setting up the string for exec
set #sqlsp = 'exec sp_create_table_awards'
--check if we go further or earlier in time
print('Changing database version...')
if (#vs > #current_vs) begin
set #sqlreverse = ''
goto upgrading
end
else begin
set #sqlreverse = 'undo_create_awards'
goto downgrading
end
--upgrading code
upgrading:
set #counter = #current_vs + 1
while (#counter <= #vs) begin
set #sqlquery = #sqlsp + cast(#counter as nvarchar(2)) + #sqlreverse
print(#sqlquery)
exec sp_executeSql #sqlquery
set #counter = #counter + 1
end
goto ending
downgrading:
set #counter = #current_vs
while (#counter > #vs) begin
set #sqlquery = #sqlsp + cast(#counter as nvarchar(2)) + #sqlreverse
print(#sqlquery)
exec sp_executeSql #sqlquery
set #counter = #counter - 1
end
goto ending
ending:
update dbo.version set version=#vs
print('Database version changed...')
end

Answer 1

Considering I figured a way, and have got no responses, I will post it as a response because it may help other students which studie computer science
To simplify I named all my procedures by this pattern do_x and undo_x where x is a int where do / undo _x are procedures which pair toughter for example do_1 and undo_1 create a table and destroy a table
ALTER PROCEDURE [dbo].[goto_vs]
-- Add the parameters for the stored procedure here
#v int = 0
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
declare #i int
declare #toexec nvarchar(70)
set #i = (select version from version)
-- If the requested version is lower than the current one, downgrade.
while(#i > #v)
BEGIN
set #i = #i - 1
set #toexec = 'Undo_' + CONVERT(varchar,#i);
exec sp_executeSql #toexec
print #toexec
END
-- Otherwise, upgrade.
while(#i < #v)
BEGIN
set #toexec = 'Update_' + CONVERT(varchar, #i);
exec sp_executeSql #toexec
set #i = #i + 1
print #toexec
END
END