Refresh database structure

Hello !
I'm using VB.net 2013 , Entity Framework 6 , SQL server 2008R2 and SMO.
I have the application that use the database.
But sometime I make changes to database structure , and I want to add to my application a "Refresh Database" command.
Let's say that I have a database model called "Model" ( as a .bak file). The refresh command should compare the current database with this model and after make all the changes needed to make the current database up to date according to model.
How this can be done using SMO ?
Thank you !

Do you think that creating a new database and migrating data it's more easy ?
Let's get an example :
The new Model.bak contains only a new field in one of the tables comparing with the current database.
Do you think that only for 1 field , I should create a new database and migrate thousand of records ? After that of course I should make additional work to make this "New database" connect with my program because I use Entity framework that
is created with wizard on design time with the database ( that have a specific name ) , and the new database have another name.
So I think is more easy to add this new field to the current database ( so make a "Refresh" ) and end of the story.
what do you think ?
thank you !
Hi dcode25,
For such a scenario adding only one more field, what you should do in the upgrade is neither to restore nor to "refresh", the only approach is to run the ALTER table script to add the column when your upgrade wizard fires. This approach should be
applied to the cases that there's not much modification in your "model". For the cases which are more complex, the restore and migration is the option.
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support
Hello !
I think that the conversion now is transformed in how we should call this process.
Why you don't like the word "Refresh". I like to call this process refresh , but we can call how we want.
The point is that I want to do this process within my application . I don't know what do you mean with "When your upgrade wizard fire ?"
Is possible to use the Alter table script in vb.net inside my application and what are the steps ? But of course I want to make this process general so regardless of how many field are added , this process should work. But how can I compare first the
current database with new model to find out what are the changes that I should made ?
And what you consider "too much modification "
The modifications on new "Model.Bak" may be :
- One (or some ) field(s) are added to one (or several ) existing table(s).
- One (or some ) field(s) are deleted to one (or several ) existing table (s).
- One (or some ) field(s) in one (or several ) existing table (s) have a different type.
- A new table is added to database
- A new table is added that have a new relationship with an existing table
- 2 or more new tables are added that may have relationship between each other.
On your opinion , which of these modifications can be done without migration and inside my application ?
For the others , why do you think that cannot be done without migrating ? Because it's impossible to do , or is difficult ?
In my opinion ( of course I can be wrong because I don't know ) these may be the steps :
1) Get one by one the tables in "Model.Bak"
2) With each table , first detect if this exist in the current database
3) If not exist , create the table ( or copy from Model ???? I don't know if can be done ).
4) If exist , compare one by one the fields , and if a field doesn't exist , add the new field. If a field exist but has a different type , change the type. After detect if one of fields in current database doesn't exist on model. If so , delete that field.
5) If a new relationship exist , add the new relationship
If you agree with these steps , which of them may be impossible to be done ?
Or if can be done , how can I realize each of these steps inside my program in vb.net ?
Thank you !

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| applications        |
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| mail text           |                | user_mail_regs      |
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