Generating Alter Table Script

Hello,

I need to change collation in my database (more databases acctualy).
Therefore, I wanted to make a script, which will do it at one more
time.

I already have a cursor, updating collation on all tables (fields) in
database.
The problem is, before I will to update the collations, I need to drop
all constrains and pk's.
But I do not want to erase them. After the collation will be updated,
these should be restored.
Therefore I wanted to additionaly script all cs, pk's for all tables,
drop them, and after updateing the collation, update the tables.

Does enyone have an idea how to do that? Or how can I get (in tsql) an
string containing information like:

ALTER TABLE [dbo].[PrmUserGroup] ADD
CONSTRAINT [FK_PrmUserGroup_PrmGroup] FOREIGN KEY
(
[id_group]
) REFERENCES [dbo].[PrmGroup] (
[id]
) ON DELETE CASCADE ON UPDATE CASCADE ,
CONSTRAINT [FK_PrmUserGroup_PrmUser] FOREIGN KEY
(
[id_user]
) REFERENCES [dbo].[PrmUser] (
[id]
) ON DELETE CASCADE ON UPDATE CASCADE
GO

If i can have such a part of script (it will complete script of cs and
pk's) i could store it temporary in the table, and after updating a
collation, run them with dynamic sql.

Or maybe there is any other, better way?

Thank you in advance

Mateusz