DebugView for query and simple way to get SQL from an EF LINQ query

[ajcvickers]

Fixes #6482

Given a query like:

var query = context.Set<Customer>().Where(c => c.City == city);

The SQL that will be generated for this query can be obtained by:

var queryString = query.ToQueryString();

and looks like this:

-- @__city_0='London' (Size = 4000)
SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
FROM [Customers] AS [c]
WHERE [c].[City] = @__city_0

Also, this is used to provide a DebugView with both the nicely printed expression:

and the generated SQL:

[ErikEJ]

Yay! Maybe this time?

[AndriySvyryd]

Extract and DRY as this is likely to change in the future.

[ajcvickers]

Did that, but then reverted since it was more lines of code. But will do it since you think it's worth it.

[AndriySvyryd]

Fewer LoC isn't always better 😃

[Suchiman]

Would it be possible to get

DECLARE @__city_0 nvarchar(4000) = 'London';
SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
FROM [Customers] AS [c]
WHERE [c].[City] = @__city_0

instead of

-- @__city_0='London' (Size = 4000)
SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
FROM [Customers] AS [c]
WHERE [c].[City] = @__city_0

Most often when i look for the query string, i want to copy paste it into SSMS to get an actual execution plan which requires manual fixup of the parameters.

[ErikEJ]

@Suchiman Great suggestion!

[ajcvickers]

@Suchiman @ErikEJ We discussed today--see #19334 (comment)

[ErikEJ]

@ajcvickers Great news!

[johnnyreilly]

This looks amazing! Are there any thoughts as to when this will ship?

[ErikEJ]

In Daily builds now, will ship in November 2020

[johnnyreilly]

So pleased to hear it! Out curiousity, how come it's not going out until November? That's a little while from now. Is it part of the next major release of EF core?

[ajcvickers]

@johnnyreilly For business reasons, the EF Core release schedule aligns with that of .NET Core.