Develop Reference

SSDT TSqlModel.DeleteObjects method doesn't behave as expected

I've been trying to use the TSqlModel method DeleteObjects to programmatically remove certain users from a Database project. The problem is that when I call the method, the user remains in the model. I wonder if I am calling the method correctly. Here's something close to what I am doing:
modelFromDacpac.DeleteObjects(#"DOMAIN\user");
When I run the following code to see if it's really gone, the user is still there!
var tst_delete= modelFromDacpac.GetObjects(User.TypeClass, new ObjectIdentifier(#"DOMAIN\user"), DacQueryScopes.Default).FirstOrDefault();
tst_delete is non-null and has a name that matches "DOMAIN\user".
Any idea what I'm doing wrong?

Prior to the DeleteObject method call, I insert the following line - where the sqlobj object is a TSqlObject referring to the user I am trying to delete
//For some reason, the logins aren't scripted objects within the DACPAC, and so cannot be deleted using the DeleteObjects method - or maybe they simply cannot be found.
modelFromDacpac.ConvertToScriptedObject(sqlobj, "DOMAIN_user.sql");
Then I call the DeleteObject method as follows:
modelFromDacpac.DeleteObjects("DOMAIN_user.sql");
I'm not sure why this works, but it does. My guess is that the DeleteObject method is pretty picky about how and where it expects to find objects. Or, maybe some objects, like users, are stored in some non-standard fashion which prevents DeleteObjects from finding them. Whatever the reason, but explicitly converting the user to a scripted object with a given name, and passing that given name to the DeleteObjects method, it works.
I am a little concerned that I do not know why it works. The other concern is that it doesn't show up in the official documentation of the TSqlModel object:
https://msdn.microsoft.com/en-us/library/microsoft.sqlserver.dac.model.tsqlmodel_methods(v=sql.120).aspx
But it does work. At least, so far.

DeleteObject caught me out the same way :) - it only deletes scripts added using AddOrUpdate when you also pass in a script name and Delete uses the same script name.
What you need to do is create a new model and add in everything except the things you want to delete.
Why do you want to delete a login? If you don't want it to be deployed you can use a deployment contributor like my one here to exclude the login at deployment time:
https://the.agilesql.club/Blogs/Ed-Elliott/HOWTO-Filter-Dacpac-Deployments
Ed

MySQL variable setting through connection string or connection object?

This is a contrived example however I have simplified it for ease of explanation.
Please see my update at the bottom before investing too much of your
time!
Background
I have some (a lot of) code that ordinarily queries my DB as follows:
SELECT name FROM sites where IsLive=1;
My challenge is to, under certain conditions, return the full list of sites, essentially
SELECT name from sites;
I do not wish to modify the actual C# code issuing the SQL (although I can do if I have to in order to achieve my goal which is purely for demonstration purposes).
Therefore in order to leave as much untouched as possible my thoughts are to insert a database-proxy-view called site that returns the data dependent on a control variable
Method
Rename existing site table to site_table
Create a new view named site that the C# code now unknowingly targets and which returns the (possibly filtered) details from site_table according to the control variable value (Note a limitation on variables in views meant I had to create a function in order to demonstrate this - see http://dev.mysql.com/doc/refman/5.7/en/create-view.html wrt error 1351)
Changes made
ALTER TABLE site RENAME TO site_table;
CREATE FUNCTION controlVariableFn() RETURNS VARCHAR(16) RETURN #controlVariable;
CREATE OR REPLACE VIEW site AS SELECT * from site_table WHERE (IsLive = 1 OR controlVariableFn() = 'SHOWALL');
The above statements are ugly but achieve the result I want, however my problem is to dynamically pass through controlVariable without changing my main SQL queries being sent.
My Question
Is there a way to (ideally as I am creating my connection object) define the controlVariable outside the actual SQL to be executed but which the View can still access similar to the above as though it had been supplied as a regular user variable parameter to the query?
so the code would look something like
var connectionString = "Server=localhost;User ID=un;Password=pw;Database=dbname;....";
DbConnection db = new MySql.Data.MySqlClient.MySqlConnection
(connectionString, "controlVariable=SHOWALL");
var results = db.Query<Site>("SELECT * FROM site;");
(I understand that this would not be a smart permanent solution)
Update
My preferred solution as outlined above will not work for me as once I get into my data access layer as the results set will
essentially be filtered again back to the original set. There are some circumstances where it
could work; it would depend on the SQL issued (e.g. when collapsing a
results set down instead of trying to expand a results set as I was
trying to do here).
In that regard I am no longer looking for an answer here but will leave it for posterity as a preferred option and as per the guidelines - thanks anyway.

If you do not want to edit the c# code then the variable will have to be stored in the database although i am not sure how you will not edit the code.
If you are willing to edit the code then you can access a secondary configuration table which will have the settings that you would like the user to pass to the view. take this and allow the user to select which they want and then pass it to the view through the application.

Using a SQL Table instead of a Dictionary Reference in C#

Right now I have all of my data that I need for my program stored in a separate class Tool and within that class their is a Dictionary<int, string> myTools. I have heard that for future use, it would be better to store this in a table within an SQL Database.
Here's what I have now:
public static Dictionary<int, string> myTools = new Dictionary<int, string>()
{
{1001, "Tool 1"},
{1002, "Tool 2"},
{1003, "Tool 3"},
//...and so on...
}
With this in my program, I am able to reference the integer associated and the output the string "name" that is attached with that integer using something like this: Tool.myTools[1002]. I like this method because I can easily change up the names of the tools without having to change the way they are called. However, I would like to ultimately control the tool names for multiple programs all through one database, and that is why I am looking to essentially copy this Dictionary class over to a SQL server. I think this is done in the form of a single table, but I am BARELY experienced with SQL Server Management Studio, and that is why I am coming here for help.
What I want to know: How can I create a table in SQL that allows me to reference the tools by their corresponding integer similar to the way I am already doing it? If it is as simple as copying all the data into a table and then referencing it with a slightly different function, then I apologize for the simple question, and a simple answer would still be welcomed!
Thanks in advance!
EDIT: Apparently I didn't give myself enough credit. I already have a table created within a database through SQL Server Management Studio. This table just has two columns, number and name. If this is wrong, then I was asking what I need to do to change or fix it, and then if this is correct, I just want to know what I need to do within Visual Studio in order to reference these tools just like I can with the dictionary. Is it really as simple as importing the database and then referencing it with db.Tools.[number] or something like that?

I would recommend googling some entity framework turorials, particular Code First.
When you learn how to create models, this would be a good starting point for your model:
class Tool {
int ToolId {get;set;}
string Name {get;set;}
}
To grab a specific tool
Tool myTool = db.Tools.Single(t=>t.ToolId == theVariableWithToolIdIWant);
string theNameOfTheTool = myTool.Name;
This won't make much sense at the moment, but after you go through some tutorials and setup your database context, hopefully it will help give you a jump start on what you want to do.

How to read old version of MongoDb document with new model in code

Lets say my c# model updated while correspondent collection still contains old documents, I want old and new documents to coexist in the collection, while using only new version of c# model to read them. I wish no inheritance is used if possible. So I wonder which of this issues are solvable and how:
there is a new property in c# model which does not present in database. I think it never should be an issue, Mongo knows nothing about it, and it will be initialized with default value. The only issue here is to initialize it with particular value for all old documents, anybody knows how?
one of property has gone from model. I want MongoDb to find out there is no more property in c# class to map the field of old document to, and to ignore it instead of crashing. This scenario probably sounds a bit strange as it would mean some garbage left in database, but anyway, is the behavior possible to implement/configure?
type if changed, new type is convertible to old one, like integer->string. Is there any way to configure mapping for old docs?
I can consider using inheritance for second case if it is not solvable otherwise

Most of the answers to your questions are found here.
BsonDefaultValue("abc") attribute on properties to handle values not present in the database, and to give them a default value upon deserialization
BsonIgnoreExtraElements attribute on the class to ignore extra elements found during deserialization (to avoid the exception)
A custom serializer is required to handle if the type of a member is changed, or you need to write an upgrade script to fix the data. It would probably be easier to leave the int on load, and save to a string as needed. (That will mean that you'll need a new property name for the string version of the property.)

C# return a parent child JSON object from the asp.net web api?

this is related to a post I made yesterday, but havent been able to resolve: ASP.Net Web API showing correctly in VS but giving HTTP500
I think I need to simplify what I'm trying to do, and work up from there.
Can anyone please point me to an example of using the asp.net Web API (I'm using VS 2012 Express RC), to return JSON from a parent/child model?
eg: (pseudo Json):
Parent: Mark
..Child: Tom
..Child: Adam
..Child: Becki
Parent: Terry
..Child: Sophie
..Child: robert
I can get it to return data from one table, but not from a linked table.
Thanks for any help,
Mark

There are two ways to go away with this.
Create a new template class, loop through the list fetched using the EF and assign the values to the properties defined in the template class. This would give you the accurate results from one to multiple tables if any. Finally return the list to the json call.
While fetching the list from the EF, create a new anonymous type and select your desired columns. For this your webmethod would have the return type as IEnumerable
Cheers!

After looking at your original post my guess is that you have circular references in your objects. This post makes reference to using Json.Net which will give you more control over what is being returned to the client.
Your other option is to remove the foreign key reference tblCustomerBooking from the tblRental object (see below).
This may allow you to return the JSON objects and test that circular references are the issue.
[ForeignKey("customer_id")]
public virtual tblCustomerBooking tblCustomerBooking { get; set; }
I do suggest using Json.NET if you're planning on returning your Domain (i.e. Entity Objects) as this will avoid all circular references, and allow you keep your two-way object relationships.
My personal preference is to using DTO's and map your Domain objects to these DTO's, allowing you to have more control over what the client sees (as seeing the 'tbl' prefix in a object name isn't good practice)